Leptaena

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Leptaena
Temporal range: Darriwilian–Emsian
Leptaena romboidalis 4.jpg
Leptaena rhomboidalis
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Brachiopoda
Class:† Strophomenata
Order:† Strophomenida
Family:† Rafinesquinidae
Subfamily:† Leptaeninae
Genus:† Leptaena
Dalman, 1828
Type species
Leptaena rugosa
Dalman, 1828
Species
See Species
Synonyms
  • KurnamenaRoomusoks, 1989
  • LeptaenopomaMarek and Havlíček, 1967
  • OrhoriaHavlicek and Storch, 1990
  • SimiloleptaenaRoomusoks, 1989
  • Turgenostrophia

Leptaena is an extinct genus of mid-sized brachiopod that existed from the Dariwilian epoch to the Emsian epoch, [1] [2] though some specimens have been found in strata as late in age as the Tournasian epoch. [1] [3] Like some other Strophomenids, Lepteana were epifaunal, meaning they lived on top of the seafloor, not buried within it, and were suspension feeders. [4]

Contents

Physical description

Leptaena usually have concentric wrinkling and concentric lines on the shell. Leptaena have a concavo-convex profile, and are sometimes Semiquadrate to semielliptical. The Cardinal Process is split in two and the hinge line is straight. [4] Their width is usually greater than their length, like most Strophomenids.

Distribution

Leptaena fossils have been found on every continent except Antarctica. [3] [5] [6]

Species

Leptaena was a diverse genus, with over 70 recognized species and subgenera. Species in the genus Leptaena include the following. [3] [6] [7] Any synonymous genera to which a given species may belong to are labelled with the synonymous genus in parentheses.

References

  1. 1 2 Plaza-Torres, Stephanie; Darroch, Simon; Wagner, Peter. "Family tree of a mass extinction survivor: Phylogenetic analysis of the brachiopod genus Leptaena" (PDF). Smithsonian. Retrieved 31 March 2020.
  2. ↑ Hoel, Ole (21 January 2014). "Palaeobiology of Silurian Leptaeninae (Brachiopoda) from Gotland, Sweden". Paleontology Journal. 2014: 1–14. doi: 10.1155/2014/716053 .
  3. 1 2 3 Paleobiology Database
  4. 1 2 Stigall, Alycia (3 December 2013). "Leptaena". Atlas of Ordovician Life. National Science Foundation. Retrieved 26 March 2020.
  5. ↑ Global Biodiversity Information Facility
  6. 1 2 "Fossilworks". Archived from the original on 2022-08-19. Retrieved 2024-11-18.
  7. ↑ Catalog of Life
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