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MANTLE PROCESS [26 fiches]

Fiche 1 2006-11-15

Anglais

Subject field(s)
  • Tectonics
  • Geology
CONT

Synrift (which literally means "at the same time as the rift") sediment would have been the first sediment deposited during the initial formation of the Mako Trough. Synrift sediment, because it would have been due to the initial erosion of the surrounding highs being deposited into the newly formed trough, is often of a coarser nature than later deposits - the sediment is deposited quickly and with less "banging around in a deep sea" to grind it to dust.

CONT

We propose to sample and date pre-, syn-, and post-rift sediments associated with the S detachment and mantle exhumation faulting, which are critical to understanding the timing of the rifting process.

OBS

syn-rift sediment: term used at Natural Resources Canada - Earth Sciences Sector.

Français

Domaine(s)
  • Tectonique
  • Géologie
DEF

Sédiments [...] déposés pendant la phase de rifting (mais avant l'océanisation).

CONT

Les sédiments continentaux présents initialement avant la rupture continentale sont appelés «sédiments pré-rift». Les sédiments lacustres et évaporatiques (comme le sel) qui se sont déposés sur les blocs basculés au cours de l'océanisation sont appelés «sédiments syn-rift». Enfin, les sédiments terrigènes issus du continent ou construits comme les récifs sont consécutifs à l'océanisation et ne se déposent que lorsque la marge passive est stabilisée. Ces sédiments qui recouvrent l'ensemble des blocs sont appelés «sédiments post-rift».

OBS

sédiment contemporain du rifting; sédiment accumulé au cours du rifting : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Espagnol

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Fiche 2 2006-02-28

Anglais

Subject field(s)
  • Tectonics
CONT

Slab rollback... refers to the process where a sinking tectonic slab subducts at a steep angle and sweeps back through the mantle like a paddle.

Français

Domaine(s)
  • Tectonique
CONT

Découverte de la semelle tectonique d'obduction préservée au sein d'une écaille interne à l'ophiolite.

Espagnol

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Fiche 3 2003-11-01

Anglais

Subject field(s)
  • Geology

Français

Domaine(s)
  • Géologie

Espagnol

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Fiche 4 2003-06-17

Anglais

Subject field(s)
  • Paleontology
OBS

(...) the process of "torsion" involves a rotation of the mantle [of a young prosobranch gastropod], and [the] juvenile shell, with its enclosed viscera, through an angle of 180 degrees in relation to the velum(from which the head later develops) and the foot. As a result the mantle cavity comes to occupy an anterodorsal position, while the coiling of the shell assumes the endogastric direction typical of the adult gastropod. Effects of this torsion on the cells from which various organs of the adult animal later arise are far-reaching. Thus, when they develop, the nerve cords connecting the cerebral and pleural to the visceral ganglia are found to be crossed(...) rather like a figure 8, instead of being parallel. The gut has been twisted into a loop. It is, moreover obvious that the positions of the left and right ctenidia, osphradia, hypobranchial glands, heart auricles, and kidneys of the ancestral untorqued form become transposed as the result of torsion, so that when, as in most prosobranchs, only one of each of these organs remains, this, although now on the 6ft-hand side, represents the original right-hand organ.

Français

Domaine(s)
  • Paléontologie
OBS

[...] à la suite de [la] flexure [anopédieuse] amenant le sac viscéral vers l'avant, et avec lui le manteau qui l'enveloppe ainsi que la cavité palléale qui les sépare et contient les branchies, les Gastéropodes subissent une "torsion" de 180 degrés amenant le complexe palléal en position antéro-latérale, et se continuant par la progressive torsion spirale des viscères, du muscle columellaire et de la coquille [...]. Cette torsion non seulement affecte le sac viscéral et la coquille qui moule le manteau en leur imprimant une forme hélicoïdale, mais entraîne aussi le "chiasma" du système nerveux dont les ganglions, initialement placés à droite, vont prendre une position topographique gauche et "vice versa". Et surtout, la principale conséquence de la torsion hélicoïdale est d'avoir transformé les Gastéropodes en animaux dissymétriques: l'étude des parties molles prouve que les organes pairs du côté droit (côté gauche originel) sont plus petits que ceux du côté gauche, et peuvent même s'atrophier et disparaître.

Espagnol

Campo(s) temático(s)
  • Paleontología
Conserver la fiche 4

Fiche 5 1997-12-03

Anglais

Subject field(s)
  • Tectonics
  • Petrography
DEF

The process of injection of magma from the mantle into the shallower portion of the earth's crust as a result of the disturbances at the plate margins; an igneous rock body formed by this process.

CONT

Metamorphic studies indicate that the previously crystallized calc-silicate gangue in pyrometasomatic deposits formed at temperatures approaching those of the associated magmatic intrusion.

Français

Domaine(s)
  • Tectonique
  • Pétrographie
CONT

Les intrusions magmatiques, notamment la mise en place des batholites granitiques, sont accompagnées d'une élévation de température des roches encaissantes.

CONT

Alors que les dimensions des laccolites n'excèdent guère une dizaine de kilomètres, on connaît au contraire des intrusions magmatiques de faible profondeur beaucoup plus étendues : ce sont les lopolites, d'aspect tabulaire, dont le toit, au lieu d'être bombé, a tendance à être déprimé comme s'il avait fléchi.

Espagnol

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Fiche 6 1997-07-07

Anglais

Subject field(s)
  • Jewellery
CONT

In cultured pearl, a bead nucleus is inserted between the mantle and the shell, and the natural nacre-forming process produces a pearl.

Français

Domaine(s)
  • Joaillerie et bijouterie

Espagnol

Conserver la fiche 6

Fiche 7 1977-06-29

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Dalmanellidae [have a] convexo-concave to plano-convex profile, [a] ventral interarea [that is] curved, apsacline, [a] dorsal interarea [that is] shorter, anacline, [a] delthyrium and [a] notothyrium [that are] open, [a] coarsely fascicostellate to finely costellate ornament very rarely with hollow costellae, [a] variably developed dorsal sulcus at least in young growth stages; [the] ventral muscle field [is] usually umbonal, broadly cordate to bilobed, with [an] adductor scar rarely enclosed by median diductor lobes; [they have a] cardinal process varying from [a] simple ridge to [an] elaborate trilobed myophore with shaft, bases of [the] simple brachiophore [are] variably disposed, fulcral plates [are] commonly developed; [the] dorsal adductor scar [is] quadripartite, [the] mantle canal system [is] commonly lemniscate in both valves. "L. Ord.-L. Carb. "

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Dalmanellidae [ont des] brachiophores simples, en lames, sans plaque fulcrale; [ils ont un] champ musculaire ventral bilobé dans la partie antérieure. Il existe cependant chez les jeunes des plaques fulcrales qui, parfois, persistent chez les adultes.

Espagnol

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Fiche 8 1977-06-29

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Rhipidomellidae [are] Dorsibiconvex to plano-convex, [the] ventral interarea [is] apsacline to orthocline, [the] dorsal interarea commonly orthocline, both becoming much reduced; [the] delthyrium [is] open, notothyrium with chilidial plates developed rarely, costellae [are] hollow [a] fold and sulcus [are] commonly not well developed; [the] ventral muscle field [is] large, oval to cordate, [the] adductor scars [are] elliptical, completely enclosed by diductors commonly with scalloped margins; [they have a] cardinal process with [a] lobate myophore and [a] short shaft, [the] brachiophores [are] commonly short, blunt with suberect bases, [the] fulcral plates [are] absent; [the] ventral and dorsal mantle canal systems [are] lemniscate. "L. Sil.-U. Perm. "

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Rhipidomellidae [sont] subcirculaires; [ils ont les] impressions musculaires des diducteurs en éventail, complètement entourées par celles des adducteurs; [des] brachiophores courts; [et n'ont] pas de plaques fulcrales silurien inférieur - permien supérieur.

Espagnol

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Fiche 9 1977-06-29

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] Family Linoporellidae [are] subequally biconvex to ventribiconvex, [the] ventral interarea [is] long, curved, apsacline, [the] dorsal interarea [is] shorter, curved, anacline, [the] delthyrium and notothyrium [are] open, [the] fold and sulcus [are] rarely well developed; [the] ventral muscle field [is] variable, [the] dental plates [are] strong; [the] cardinal process [is a] simple ridge, continuous anteriorly with [a] median septum, [the] brachiophores [are] long, bladelike, with [the] bases convergent on to [a] strong median septum to form [a] septalium, fulcral plates [are] present; [the] ventral mantle canal system [is] possibly saccate, [the] dorsal [is] probably lemniscate. "M. Ord.-U. Sil. "

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Linoporellidae [ont] les brachiophores [qui] se réunissent au septum médian, (...) à la valve dorsale (...)

Espagnol

Conserver la fiche 9

Fiche 10 1977-06-29

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Heterorthidae [are] transversely subcircular to subquadrate with [the] hinge line less than [the] maximum shell width, concavo-convex to bioconvex, [the] ventral interarea [is] apsacline, [the] dorsal interarea [is] anacline, [the] delthyrium [is] open, [the] notothyrium [is] open or with [a] chilidium, [they are] typically finely costellate, rarely with [a] ventral fold and dorsal sulcus; [the] ventral muscle field [is] large with long divergent, semi-circular, commonly flabellate and scalloped, diductor scars with anterior ends widely separated, extending far beyond and not enclosing [the] adductor scars; [the] cardinal process is narrow of semioval with [a] commonly trilobate posteroventral surface, [the] brachiophores [are] ridge like, fused to [the] valve floor throughout their length, [the] dorsal adductor field [is] quadripartite, subcircular; [the] dorsal mantle canal system [is] lemniscale, [the] ventral [is] probably also lemniscate. "M. Ord.-U. Ord. "

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Heterorthidae [sont] plats ou, concavo-convexes; l'impression des muscles diducteurs ventraux en éventail n'entoure pas les adducteurs; [le] processus cardinal [est] étroit, avec [un] myophore allongé; [il y a un] dépôt secondaire chez les brachiophores.

Espagnol

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Fiche 11 1977-06-27

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Stropheodontidae [lack a] functional pedicle and [have] simple teeth and dental plates replaced by denticles subsequently spreading along [the] hinge line; socket ridges [are] abbreviated subsequent to [the] loss of [the] dental plates becoming obsolescent or(...) disappearing completely, exceptionally [form] buttresses to [the] cardinal process lobes; [the] pseudodeltidium [is] initially small, apical, becoming progressively larger and in some stocks ultimately closing [the] delthyrium completely; [the] chilidium [is] initially massive becoming degenerate and in some stocks ultimately completely lost; [the] mantle canal patterns in both valves [are] probably lemniscate; [the] shell substance [is] densely pseudopunctate. "U. Ord.-U. Dev. "

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Stropheodontidae [ont un] Bord cardinal avec [des] crénelures plus ou moins développées et plus ou moins durables.

Espagnol

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Fiche 12 1977-06-27

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] subfamily Leptellininae [have a] Strong cardinal process differentiated into [a] sharp median crest and lower lateral ridges on [the] posterior face; [the] lophophore platform [is] wide, extending to [the] postero-lateral margins, with [a] high median crest; [the] ventral mantle canal system [is] saccate to lemniscate, [the] dorsal mantle canal pattern [is] digitate or lemniscate. "L. Ord.-L. Sil. "

Français

Domaine(s)
  • Paléontologie
OBS

[les Brachiopodes de la] sous-famille des Leptellininae [ont un] processus cardinal formant une simple crête entre les plaques chilidiales, ou absent; [et un] disque viscéral surélevé. Ce sont des formes essentiellement ordoviciennes.

Espagnol

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Fiche 13 1977-06-24

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Plectambonitidae [have a] median cardinal process growing from [the] notothyrial floor and ankylosed posteriorly to [a] convex chilidium; [the] pseudodeltidium [is] large; [an] apical foramen [is] sporadically persistent in adult shells. [The] pedicle valve [has a] pair of accessory teeth lying anterolaterally to two simple teeth; [the] brachial valve [is] without [an] elevated, lophophore platform, socket ridges [are] flat-lying, subparallel with [the] hinge line; subperipheral rims, possibly representing boundaries of [the] brachial cavity, [are] usually well-developed in both valves; mantle canal systems [are] poorly known but probably saccate in both valves. "L. Ord.-M. Ord. "

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Plectambonitidae [ont une] valve dorsale [qui] présente des septa ou bourrelets partant de l'extrémité des plaques crurales et formant une sorte de disque viscéral surélevé.

Espagnol

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Fiche 14 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Articulate brachiopods of the] family Eoorthidae(...) [have the following characteristics : the] Interareas [are] well developed, [the] hinge lines wide, [the] delthyrium and notothyrium open; [the] teeth [are] strong, commonly supported by receding dental plates, [the] ventral muscle scar [is] variably impressed on [the] valve floor or [the] pseudospondylium; [the] cardinal process and notothyrial platform [are] rudimentary, [the] socket ridges widely divergent, bladelike, making acute angles with [the] hinge line to define [the] sockets; the ventral mantle canal system [is] saccate with [the] proximal parts of [the] "vascula media" divergent. L. Cam.-L. Ord.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes articulés membres de la] famille des Eoorthidae (...) [ont un] deltidium et [un] chilidium dans le jeune âge seulement; [ils n'ont] pas de spondylium, mais [des] plaques dentales bien développées, ou un pseudospondylium; [le] processus cardinal [est] peu développé.

Espagnol

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Fiche 15 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Articulate brachiopods of the] family Billingsellidae(...) [have the following characteristics :] Interareas and hinge lines [are] well developed, pseudodeltidium [is] strong, perforate apically, [a] chilidium [is] present; [the] teeth [are] large, [the] dental plates [are] variably developed, [the] ventral muscle field with widely divergent diductor scars and [a] large subtriangular adductor track commonly extending well anterior of [the] umbonal cavity; [the] cardinal process [is] simple ridgelike, [the] socket ridges [are] as widely divergent short, unsupported blades, [the] sockets [are] cuplike; [the] ventral mantle canal system [is] saccate, [the] dorsal probably digitate. Shell substance [is] impunctate. L. Cam.-L. Ord.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes articulés de la] famille des Billingsellidae [n'ont] pas de vrai spondylium (un pseudospondylium peut exister); pas de cruralia; [ils ont un] processus cardinal simple, plus ou moins développé.

Espagnol

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Fiche 16 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Orthidae(...) [have the following] characteristics : the] interareas and hinge lines [are] of variable length, [the] delthyrium [is] open, [the] notothyrium rarely covered by [a] chilidium; [the] teeth [have] crural fossettes, [the] dental plates [are] variably disposed, [the] ventral muscle field [is] short, not extending much beyond [the] umbonal cavity, commonly suboval, [the] median adductor scars [are] not enclosed by diductors; [the] cardinal process [is] simple, ridgelike, [the] brachiophores [are] rodlike, unsupported; [the] ventral mantle canal system [is] saccate, [the] dorsal mantle canal system [is] saccate to digitate. M. Cam.-L. Dev.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Orthidae (...) [ont le] delthyrium largement ouvert. [Le] processus cardinal [est] bien développé; [l'] aréa musculaire [est] ventrale, petite, ovale ou cordée; [les] empreintes ovariennes [sont] subréniformes (...). Cambrien moyen à la fin du Silurien.

Espagnol

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Fiche 17 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Dolerorthidae(...) [have the following characteristics : the] Ventral interareas [are] long; [the] hinge lines [are] wide; [the] teeth with oblique fossettes, supported by receding dental plates, [the] ventral muscle field [is] elongate subtriangular to subcordate with rounded anterior margins of diductor scars commonly extending beyond but not enclosing [the] lanceolate adductors usually contained by low ridges; [the] cardinal process [is] ridgelike, rarely absent, [the] brachiophores [are] commonly as [a] pair of long blades, triangular in section; [the] ventral mantle canal system [is] saccate with [the] "vascula media" converging medianly. L. Ord.-U. Sil.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Dolerorthidae (...) [sont] convexo-concave ou inégalement biconvexe, mais dans ce cas, à l'inverse des autres genres, c'est la valve dorsale qui est la plus convexe. Silurien inférieur et moyen (...)

Espagnol

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Fiche 18 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Hesperonomiidae(...) [have] interareas [that are] variable in length; [the] hinge lines [are] wide. [the] delthyrium [is] open, [the] chilidium [is] poorly developed; [the] ventral muscle field [is] Subquadrate, extending beyond [the] umbonal region; [the] cardinal process [is a] simple ridge not ankylosed to [the] variably developed notothyrial ridges, [the] brachiophores [are] short, rodlike; [the] ventral mantle canal system [is] saccate, [the] dorsal [is] digitate. L. Ord.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Hesperonomiidae (...) [sont] Transverses, aplatis ou faiblement convexes; [Le] processus cardinal [est] simple; [ils sont] du type d'"Orthacea" par les brachiophores et les muscles ventraux; [ils ont] un chilidium.

Espagnol

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Fiche 19 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Orthidiellidae(...) [have] interareas and hinge lines of variable length, [the] deltidium [is] sporadically developed; [the] ventral muscle field [is] subtriangular, commonly extending in front of [the] umbonal region, [the] cardinal process [is] developed as [a] high ridge ankylosed to [a] pair of notothyrial ridges simulating [a] trilobed structure cemented to simple rod-or bladelike brachiophores by secondary shell; [the] ventral mantle canal system [is] saccate, with [the] proximal parts of [the] "vascula media" divergent, [the] dorsal digitate. L. Ord.-U. Ord.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] Famille Orthidiellidae (...) [sont des] "Orthacea" de petite taille avec un dépôt coquillier aux plaques brachiophores.

Espagnol

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Fiche 20 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Articulate brachiopods of the] family Protorthidae [have the following characteristics] interareas well developed, hinge lines wide, delthyrium and notothyrium open; [the] teeth [are] small, [the] ventral muscle field [is] supported by [a] free spondylium; [the] cardinal process and [the] notothyrial platform [are] variably developed, [the] brachiophores [are] bladelike and variably disposed; [the] ventral mantle canal system [is] saccate with [the] proximal parts of [the] "vascula media" divergent. M. Cam.

Français

Domaine(s)
  • Paléontologie
OBS

Les Brachiopodes articulés de la] famille des Protorthidae [ont] une petite plaque à la valve ventrale (spondylium); [ils n'ont] pas de deltidium, ni chilidium.

Espagnol

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Fiche 21 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] Family Skenidiidae(...) [are] Subpyramidal, with [an] open delthyrium and chilidium; [the] ventral muscle field [is] contained in [a] free or supported spondylium; [the] brachiophores [are] long, slender, commonly with bases convergent on [a] high median septum and united laterally to socket plates or to hinge plates containing sockets; [the] cardinal process is simple or differentiated into [a] shaft and crenulated myophore; [the] dorsal adductor field [is] shield-shaped, impressed on either side of [the] septum; [the] mantle canal systems [are] rarely preserved. L. Ord-U. Dev.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] Famille des Skenidiidae (...) [sont de] Petite taille; subpyramidale; [ils ont un] spondylium.

Espagnol

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Fiche 22 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] family Plectorthidae [have] interareas and hinge lines of variable length, [the] delthyrium and [the] notothyrium [are] open; [the] teeth [have] oblique fossettes [and are] supported by strong dental plates extending anteriorly, [the] ventral muscle field [is] variable but commonly elongately cordate; [the] cardinal process [is] almost invariably present and differentiated into [a] crenulated myophore and shaft in adult shells; brachiophore bases [are] either convergent onto [the] floor of [the] brachial valve near [the] junction of [the] cardinal process and [the] median ridge dividing quadripartite adductor scars and ankylosed to concave fulcral plates, or rarely divergent and replacing [the] fulcral plates; [the] ventral and dorsal mantle canal systems [are] saccate. L. Ord.-U. Sil.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Plectorthidae (...) [ont un] processus cardinal simple et [un] myophore crénelé. [Le] delthyrium et [le] notothyrium [sont] ouverts.

Espagnol

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Fiche 23 1977-06-23

Anglais

Subject field(s)
  • Paleontology
OBS

[Brachiopods of the] Family Taffiidae(...) [are] Subquadrate, faintly sulcate unequally parvicostellate. [The] Musculature and cardinalia [are] orthoid-like; [the] notothyrium [is] covered completely by [a] chilidium; [the] teeth [are] simple; supported by short dental plates; [the] cardinal process [is] absent or present as [a] median ridge, exceptionally differentiated into [a] myophore; [the] pseudodeltidium [is] variable in development, [the] apical foramen [is] small, only sporadically persistent in adult shells; subperipheral rims [are] variably developed; mantle canal systems [are] poorly known and variable. "L. Ord.(U. Canad.-Whiterock) ".

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] famille des Taffiidae (...) [ont un] aspect extérieur de "Rafinesquina" et [une] structure pseudopuncturée, avec des caractères internes d'"Orthidae"; le processus cardinal est simple quand il existe. (...) Ordovicien inférieure (...)

Espagnol

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Fiche 24 1977-06-21

Anglais

Subject field(s)
  • Paleontology
OBS

[Members of the] superfamily Kutorginacea [have a shell that is] calcareous, biconvex; [a] cardinal area [is] present in [the] pedicle valve(...) [a] small apical foramen, [a] widely triangular(...) delthyrium(...), partially closed by [a] pseudodeltidium; teeth [are] seemingly absent. [the] Brachial valve [has a] variably developed cardinal area, [the] notothyrium may be restricted apically by [a] chilidium, [the] cardinal process [is] absent. Two principal mantle canals [are] in both valves, with numerous radially arranged grooves, probably vascular in origin; [a] muscle field in each valve [is] narrow, elongate, near [the] mid-line of [the] valve. L. Cam., ?M. Cam.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes de la] superfamille des Kutorginacea (...) [ont une] aire cardinale plus ou moins rudimentaire, un homoeodeltidium, un test presque calcaire et des empreintes musculaires au moins indiquées. Cambrien.

Espagnol

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Fiche 25 1977-06-21

Anglais

Subject field(s)
  • Paleontology
OBS

[The] Family Acrotretidae [is made up of] generally small to minute [inarticulate brachiopods] ;[the] pseudointerarea of [the] pedicle valve [is] commonly divided by [an] intertrough or deltoid pseudointerarea; [the] pedicle foramen [is] small, at or somewhat posterior to [the] beak, [and] may be [a] simple perforation or continued internally as some form of tube, [an] apical process [is] present in many species; [the] brachial valve [is] gently convex to gently concave, [a] marginal beak, pseudointerarea well developed to obsolescent, anacline to orthocline, [a] median septum [is] usually present, [and] may be merely a ridge or absent. Muscle scars of [the] pedicle valve include [a] pair of relatively large cardinal scars posterolaterally placed and [a] pair of small apical pits. [The] brachial valve bears [a] pair of large cardinal scars posterolaterally situated and [a] smaller pair of anterior scars close together, near [the] center of [the] valve; another more doubtful scar is medially placed immediately in front of [the] pseudointerarea. [A] ventral mantle canal system typically consists of [a] pair of baculate "vascula lateralia"(more rarely pinnate... ;[the] mantle canal system of [the] brachial valve... commonly comprises [a] pair of basculate "vascula lateralia" that diverge anterolaterally from in front of [the] beak, with [an] additional, poorly impressed pair of "vascula media". Lower Cambrian-Upper Silurian? Lower Devonian.

Français

Domaine(s)
  • Paléontologie
CONT

[La] famille des Acrotretidae [...] [est une] famille unique [de Brachiopodes inarticulés appartenant à la superfamille des Acrotretacea,] avec trois sous-familles : Acrothelinae, [...] Acrotretinae [...], Acrosaccinae [...]

Espagnol

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Fiche 26 1977-06-21

Anglais

Subject field(s)
  • Paleontology
OBS

[Articulate brachiopods of the] Superfamily Orthacea(...) [have an] open delthyrium, rarely constricted by deltidial plates or [a] deltidium, [a] chilidium [is] rare; teeth [are] simple, commonly with deep crural fossettes and supported by dental plates; [the] ventral muscle field [is] rarely supported by [a] spondylium [the] cardinal process [is] simple or differentiated, rarely absent; sockets [are] simple or defined by fulcral plates, brachiophores [are] commonly rodlike, less commonly with supporting bases convergent or divergent on [the] floor of [the] brachial valve; [the] ventral mantle canal system [is] commonly saccate, with [the] proximal parts of "vascula media" convergent or divergent on to [the] median plane, [the] dorsal mantle canal system [is] commonly digitate, rarely apocopate. [The] Shell substance [is] impunctate. L. Cam.-U. Dev.

Français

Domaine(s)
  • Paléontologie
OBS

[Les Brachiopodes articulés de la] Super-famille des Orthacea (...) [ont un] Pédoncule toujours fonctionnel; [le] pseudodeltidium et [le] chilidium chez les premières formes disparaissant ensuite; [le] processus ensuite cardinal en général [est] bien développé; [cette] super-famille [était] très abondante durant tout le Paléozoïque.

Espagnol

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