dcsimg

Rhynchonellida ( allemand )

fourni par wikipedia DE

Rhynchonellida (Rhynchonelliden) sind ein Taxon von Armfüßern (Brachiopoda) mit kurzem Schlossrand, mit mehr oder weniger kugeliger Gehäuseform und einer impunctaten Schale. Einfache Armstützen (Cruren) sind Ansätze für das fleischige Armgerüst. Sie bilden zusammen mit den Protorthida, Orthida, Spiriferida, Atrypida, Pentamerida und Terebratulida das Taxon Rhynchonellata, das seinerseits zum Unterstamm der Rhynchonelliformea zählt.

Merkmale

Charakteristisch ist der kurze Schnabel der Ventralklappe oder Stielklappe („rostrat“) und das Auftreten von Sinus und Wulst. Das Delthyrium ist von Deltidialplatten von beiden Seiten her eingeengt. Die Vertreter der Rhynchonelliden ähneln sich äußerlich sehr stark. Wichtig für die taxonomische Zuordnung ist der Bau von Cruren und Septen (Serienschliffe erforderlich).

Systematik

Die Rhynchonelliden teilen sich in zwei Untertaxa auf, die nach Ausbildung eines Spondyliums untergliedert sind:

Literatur

Einzelnachweise

  1. O. Kuhn: Lehrbuch der Paläozoologie. 326 S., E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, 1949
licence
cc-by-sa-3.0
droit d’auteur
Autoren und Herausgeber von Wikipedia
original
visiter la source
site partenaire
wikipedia DE

Rhynchonellida: Brief Summary ( allemand )

fourni par wikipedia DE

Rhynchonellida (Rhynchonelliden) sind ein Taxon von Armfüßern (Brachiopoda) mit kurzem Schlossrand, mit mehr oder weniger kugeliger Gehäuseform und einer impunctaten Schale. Einfache Armstützen (Cruren) sind Ansätze für das fleischige Armgerüst. Sie bilden zusammen mit den Protorthida, Orthida, Spiriferida, Atrypida, Pentamerida und Terebratulida das Taxon Rhynchonellata, das seinerseits zum Unterstamm der Rhynchonelliformea zählt.

licence
cc-by-sa-3.0
droit d’auteur
Autoren und Herausgeber von Wikipedia
original
visiter la source
site partenaire
wikipedia DE

Rhynchonellida ( anglais )

fourni par wikipedia EN

Hemithiris psittacea, a living rhynchonellide
Ladogia sp., a rhynchonellid brachiopod from the Devonian of western Russia (side view).

The taxonomic order Rhynchonellida is one of the two main groups of living articulate brachiopods, the other being the order Terebratulida. They are recognized by their strongly ribbed wedge-shaped or nut-like shells, and the very short hinge line.

The hinges come to a point, a superficial resemblance to many (phylogenetically unrelated) bivalve mollusk shells. The loss of the hinge line was an important evolutionary innovation, rhynchonellids being the first truly non-strophic shells with a purely internal articulation (teeth-sockets).

Strong radiating ribs are common in this group; and there are generally very strong plications or accordion-like folds on the sulcus (the long middle section) of the shell. This probably helps regulate the flow of water in and out of the shell. All rhynchonellids are biconvex (have a bulbous shell), and have a fold located in the brachial valve. This means that the commissure, the line between the two valves or shells, is zigzagged, a distinguishing characteristic of this group. The prominent beak of the pedicle valve usually overlaps that of the brachial valve, in order to allow the shell to open and close. There is usually a functional pedicle although the delthyrium may be partially closed.

Morphologically, the rhynchonellid has changed little since its appearance during the Ordovician period. It seems to have evolved from pentamerids, and in turn gave rise to the first atrypids and athyrids, both of which are characterized by the development of a complex spiral brachidium. Although much diminished by the terminal Paleozoic extinction, it experienced a revival during the Early Jurassic period, and became the most abundant of all brachiopods during the Mesozoic Era.

Classification

This classification down to the level of genera is based on Kazlev[1] and Emig.[2]

Extant subgroups

Extinct Subgroups

References

  1. ^ M. Alan Kazlev. "Order Rhynchonellida". Archived from the original on March 13, 2006. Retrieved March 10, 2006.
  2. ^ Christian C. Emig. "Systematics of extant brachiopod taxa" (PDF). Archived from the original (PDF) on May 13, 2006. Retrieved March 10, 2006.

licence
cc-by-sa-3.0
droit d’auteur
Wikipedia authors and editors
original
visiter la source
site partenaire
wikipedia EN

Rhynchonellida: Brief Summary ( anglais )

fourni par wikipedia EN
Hemithiris psittacea, a living rhynchonellide Ladogia sp., a rhynchonellid brachiopod from the Devonian of western Russia (side view).

The taxonomic order Rhynchonellida is one of the two main groups of living articulate brachiopods, the other being the order Terebratulida. They are recognized by their strongly ribbed wedge-shaped or nut-like shells, and the very short hinge line.

The hinges come to a point, a superficial resemblance to many (phylogenetically unrelated) bivalve mollusk shells. The loss of the hinge line was an important evolutionary innovation, rhynchonellids being the first truly non-strophic shells with a purely internal articulation (teeth-sockets).

Strong radiating ribs are common in this group; and there are generally very strong plications or accordion-like folds on the sulcus (the long middle section) of the shell. This probably helps regulate the flow of water in and out of the shell. All rhynchonellids are biconvex (have a bulbous shell), and have a fold located in the brachial valve. This means that the commissure, the line between the two valves or shells, is zigzagged, a distinguishing characteristic of this group. The prominent beak of the pedicle valve usually overlaps that of the brachial valve, in order to allow the shell to open and close. There is usually a functional pedicle although the delthyrium may be partially closed.

Morphologically, the rhynchonellid has changed little since its appearance during the Ordovician period. It seems to have evolved from pentamerids, and in turn gave rise to the first atrypids and athyrids, both of which are characterized by the development of a complex spiral brachidium. Although much diminished by the terminal Paleozoic extinction, it experienced a revival during the Early Jurassic period, and became the most abundant of all brachiopods during the Mesozoic Era.

licence
cc-by-sa-3.0
droit d’auteur
Wikipedia authors and editors
original
visiter la source
site partenaire
wikipedia EN

Rhynchonellida ( espagnol ; castillan )

fourni par wikipedia ES

Los rinconélidos (Rhynchonellida) son un orden de braquiópodos que aparecen en el registro fósil en el Ordovícico,[1]​ y que se caracterizan por presentar costillas muy marcadas,[2]​ y por tener la comisura de las valvas replegada, con un pliegue en la valva dorsal y un surco en la ventral que encajan entre sí.[3]

Referencias

  1. Paleontological Laboratory at SUNY Cortland. «Brachiopoda» (en inglés). Consultado el 23 de diciembre de 2009.
  2. Palaeos. «Order Rhynchonellida» (en inglés). Archivado desde el original el 13 de marzo de 2006. Consultado el 23 de diciembre de 2009.
  3. Geología y Paleontología de las Sierras Subbéticas Cordobesas. «Braquiópodos de las Sierras Subbéticas Cordobesas». Consultado el 29 de diciembre de 2009.

 title=
licence
cc-by-sa-3.0
droit d’auteur
Autores y editores de Wikipedia
original
visiter la source
site partenaire
wikipedia ES

Rhynchonellida: Brief Summary ( espagnol ; castillan )

fourni par wikipedia ES

Los rinconélidos (Rhynchonellida) son un orden de braquiópodos que aparecen en el registro fósil en el Ordovícico,​ y que se caracterizan por presentar costillas muy marcadas,​ y por tener la comisura de las valvas replegada, con un pliegue en la valva dorsal y un surco en la ventral que encajan entre sí.​

licence
cc-by-sa-3.0
droit d’auteur
Autores y editores de Wikipedia
original
visiter la source
site partenaire
wikipedia ES