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UMBONAL MUSCLE [11 fiches]

Fiche 1 1977-07-06

Anglais

Subject field(s)
  • Paleontology
OBS

[Bivalves of the] family Anthracosiidae(...) [have shells that are] equivalve or subequivalve, highly variable, but commonly ovate, elliptical, subtriangular or suborbicular in outline; [the] hinge line [is] gently arcuate. [A] circular anterior adductor scar [is] deeply impressed, slightly smaller in area than [the] shallow oval posterior scar and situated near [the] margin with [the] angle of [the] usually well-defined, subtriangular frontal lobe; [the] anterior retractor muscle [is] situated above and close to [the] anterior adductor, its impression visible on [the] internal molds as [a] small single or double scar on [the] crest of [the] umbonal ridge. Dentition [is] variable, usually consisting of one subumbonal tooth(in both valves or in only one), which may not reach [the] edge of [the] hinge plate, but two teeth may occur in each valve, or in one valve only(single tooth, which may be in either valve, fitting between) ;[there are] rarely more than two teeth(maximum four, of low relief) present in each valve, and [the] hinge plate may be edentulous. [The] lunule and escutcheon [are] variable, but usually feebly defined. "Carb., ? Perm. ".

Français

Domaine(s)
  • Paléontologie
OBS

[Les Lamellibranches de la] famille des Anthracosiidae (...) [ont une] coquille inéquilatérale, ovale, subtrapéziforme ou triangulaire, lisse ou finement striée concentriquement, [le] ligament [est] externe. [Ils ont une] Charnière présentant de très grandes variations et ne constituant pas, de ce fait, un bon caractère générique; il y a tantôt une dent sous le crochet et une dent postérieure, tantôt de nombreuses dents, tantôt pas de dents. (...) Dévonien au Trias. (...)

Espagnol

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Fiche 2 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 3 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 4 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 5 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 6 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 7 1977-06-21

Anglais

Subject field(s)
  • Paleontology
OBS

[The] Superfamily Trimerellacea [includes] large [inarticulate brachiopods] with thick calcareous shells, biconvex, inequivalved, elongate oval to transversely oval in outline, [the] shell smooth except for growth lines; [the] beak of [the] pedicle valve [is] prominent, [the] pseudointerarea [is] well developed, generally apsacline, divided into two propareas by [a] triangular homeodeltidium. Internally, [the] ventral umbo may be solid or divided into two umbonal chambers by [a] cardinal buttress; muscle platforms [are] present in both valves, solid or excavated, when excavated, [the] cavity [is] divided into two vaults by [a] median partition that may extend anterior to [the] platform. M. Ord.-U. Sil.

Français

Domaine(s)
  • Paléontologie
OBS

[La] Super-famille des Trimerellacea [est un groupe de Brachiopodes inarticulés ayant une] Coquille calcaire; [une] grande taille; [et des] empreintes musculaires sur une plate-forme surélevée.

Espagnol

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Fiche 8 1977-06-21

Anglais

Subject field(s)
  • Paleontology
OBS

[The] family Obolidae [belonging to the inarticulate brachiopods, has members which are] rounded, suboval or elongate in outline, ornamented by growth lines rarely becoming lamellose or spiny; [the] propareas of [the] pedicle valve [are] well developed. [The] principal musculature consists of [an] umbonal muscle that may be partly or completely divided into two separate muscles, paired centrals, transmedians, anterior, middle and outside laterals. "Vascula lateralia" of both valves [is] baculate; converging slightly forward; "vascula media" of [the] brachial valve [is] commonly diverging from [the] anterior projection of [the] visceral area but [is] adequately known only in Obolinae. L. Cam.-U. Ord.

Français

Domaine(s)
  • Paléontologie
OBS

[La] famille des Obolidae [est une famille de Brachiopodes inarticulés dont les individus ont] parfois une partie lisse de chaque côté du delthyrium (proparea). [Les] aires cardinales [sont] bien développées et striées. [Ils ont des] impressions musculaires et vasculaires bien marquées. Cambrien-Ordovicien.

Espagnol

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Fiche 9 1977-06-18

Anglais

Subject field(s)
  • Paleontology
OBS

[The] Lingulidae [are a family of inarticulate brachiopods. The members are] elongate oval to spatulate in outline, more rarely subtriangular, gently biconvex; [the] beak of [the] pedicle valve [has a] broadly triangular ventral depression or groove for [the] passage of [the] pedicle, [the] posterolateral margins of [the] valve [are] thickened, striated, lacking flexure lines, but rarely forming well-defined triangular propareas. [The] beak of [the] brachial valve [has] small, uninterrupted pseudointerarea, not extending as a plate into the valve. [The] Principal musculature [consists] of [an] umbonal muscle, paired centrals, transmedians, anterior, outside and middle laterals. One pair of principal mantle canals("vascula lateralia") [is] in each valve.(...) ? Ord., Sil.-Rec.

Français

Domaine(s)
  • Paléontologie
OBS

Lingulidae [est une famille de Brachiopodes inarticulés dont les individus ont un] contour plus ou moins spatulé ou subquadrangulaire. [Ils sont] subéquivales. [Ils ont des] muscles hautement différenciés. Ordovicien-Actuel, avec maximum à l'Ordovicien.

Espagnol

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Fiche 10 1977-06-18

Anglais

Subject field(s)
  • Paleontology
OBS

[A transmedian muscle is one of a] Pair of muscles in some Lingulida anterior to [the] umbonal muscle; one [of the transmedian] muscles [originates] on [the] left side of [the] pedicle valve, rising dorsally to be inserted on [the] right side of [the] brachial valve, [the] second [transmedian] muscle originates on [the] right side of [the] pedicle valve and [is] inserted on [the] left side of [the] brachial [valve](...)

Français

Domaine(s)
  • Paléontologie
OBS

[Chez un brachiopode inarticulé, un muscle transmédian est un de deux muscles]qui, fixés postérieurement à la valve ventrale, s'élèvent obliquement.

Espagnol

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Fiche 11 1977-06-10

Anglais

Subject field(s)
  • Paleontology
OBS

[The] umbonal muscle [is a] single muscle occurring in some Lingulida, thought to be homologous with posterior adductors; [it] consists of two bundles of fibers, posteriorly and slightly asymmetrically placed(...)

Français

Domaine(s)
  • Paléontologie
OBS

Le muscle umbonal (...) joue probablement comme [muscle] déducteur [chez certains brachiopodes inarticulés]

Espagnol

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