Biology:Leptaena

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Short description: Genus of paleozoic brachiopods

Leptaena
Temporal range: Darriwilian–Emsian
Leptaena romboidalis 4.jpg
Leptaena rhomboidalis
Scientific classification e
Domain: Eukaryota
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
  • Kurnamena Roomusoks, 1989
  • Leptaenopoma Marek and Havlíček, 1967
  • Orhoria Havlicek and Storch, 1990
  • Similoleptaena Roomusoks, 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]

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.

  • L. acuta (Kurnamena) (Roomusoks, 2004)
  • L. acuticuspidata Amsden, 1958
  • L. aequalis Amsden, 1974
  • L. alliku (Oraspold, 1956)
  • L. altera Rybnikova, 1966
  • L. amelia (Havlicek, 1967)
  • L. analogaeformis Biernat, 1966
  • L. arberae Kelly, 1967
  • L. argentina (Thomas, 1905)
  • L. bergstroemi Cocks, 2005
  • L. borghiana Mergl & Massa, 1992
  • L. boyaca Caster, 1939
  • L. contermina Cocks, 1968
  • L. convexa Weller, 1914
  • L. cooperi Easton et al., 1958
  • L. crassorugata (Similoleptaena) (Rõõmusoks, 2004)
  • L. croma (Havlicek & Storch, 1990)
  • L.crypta Opik, 1930
  • L. cryptoides (Oraspold, 1956)
  • L. dejecta (Baarli, 1995)
  • L. delicata Amsden, 1949
  • L. depressa (Sowerby, 1825)
  • L. diademata (Williams, 1962)
  • L. electra (Havlicek, 1967)
  • L. ennessbe Spjeldnaes, 1957
  • L. enucleata Klenina, 1984
  • L. friedrichi (Similoleptaena) (Rõõmusoks, 2004)
  • L. gibbosa (James, 1874)
  • L. haverfordensis Bancroft, 1949
  • L. holcrofti Bassett, 1974
  • L. indigena Spjeldnaes, 1957
  • L. infrunita (Williams, 1962)
  • L. ingrica (Similoleptaena) (Rõõmusoks, 2004)
  • L. juvenilis (Öpik, 1930)
  • L. kentuckiana Pope, 1982
  • L. lappa (Havlicek & Storch, 1990)
  • L. lappina (Havlicek & Storch, 1990)
  • L. laterorugata (Kurnamena) (Roomusoks, 1989)
  • L. lemniscata (Havlicek, 1967)
  • L. limbifera (Havlicek, 1967)
  • L. martinensis Cocks, 1968
  • L. moniquensis Foerste, 1924
  • L. nanaformis Zhang et al., 1983
  • L. nassichuki Smith, 1980
  • L. odeon Havlicek, 1967
  • L. oklahomensis Amsden, 1951
  • L. ordovicica (Cooper, 1956)
  • L. orhor (Havlicek & Storch, 1990)
  • L. palmrei (Kurnamena) (Roomusoks, 2004)
  • L. parvirugata Hoel, 2005
  • L. parvissima Ivanovskii & Kulkov, 1974
  • L. paucirugata (Roomusoks 1989)
  • L. pertenuis (Similoleptaena) (Rõõmusoks, 2004)
  • L. planitia (Similoleptaena) (Rõõmusoks, 2004)
  • L. poulseni Kelly, 1967
  • L. praequalis Rozman, 1977
  • L. provellerosa (Havlicek & Storch, 1990)
  • L. purpurea Cocks, 1968
  • L. quadrata Bancroft, 1949
  • L. quadrilatera (Logan, 1863)
  • L. rara (Alekseeva and Erlanger, 1983)
  • L. reedi Cocks, 1968
  • L. rhomboidalis (Wahlanberg, 1818)
  • L. richmondensis Foerste, 1909
  • L. roomusoki Cocks, 2005
  • L. rugata (Lindström, 1861)
  • L. rugaurita (Havlicek, 1967)
  • L. rugosa (Dalman, 1828)
  • L. rugosides Oraspold, 1956
  • L. salopiensis (Williams, 1963)
  • L. semiradiata Sowerby, 1842
  • L. senecta Roomusoks, 2004
  • L. sperion Bassett, 1977
  • L. spumiferra (Kurnamea) (Opik, 1930)
  • L. strandi (Spjeldnaes, 1957)
  • L. tarwanpensis (Similoleptaena) (Rõõmusoks, 2004)
  • L. taxilla (Kurnamena) (Oraspold, 1965)
  • L. tenuissimestriata McCoy, 1852
  • L. tenuistrata Sowerby, 1839
  • L. tenuistriata (de Sowerby and Murchison, 1839)
  • L. trifidium (Leptaenopoma) (Marek and Havlíček, 1967)
  • L. trifidum (Marek and Havlíček, 1967)
  • L. undosa (Similoleptaena) (Rõõmusoks, 2004)
  • L. valentia (Cocks, 1968)
  • L. valida Bancroft, 1949
  • L. veldrensis Spjeldnaes, 1957
  • L. vellerosa Havlicek, 1967
  • L. ventricosa Williams, 1963
  • L. zeta Lamont, 1947
  • L. ziegleri Cocks, 1968


References

  1. 1.0 1.1 Plaza-Torres, Stephanie; Darroch, Simon; Wagner, Peter. "Family tree of a mass extinction survivor: Phylogenetic analysis of the brachiopod genus Leptaena". Smithsonian. https://naturalhistory.si.edu/sites/default/files/media/file/2015-plaza-torres-poster.pdf. 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. 3.0 3.1 3.2 Paleobiology Database
  4. 4.0 4.1 Stigall, Alycia (3 December 2013). "Leptaena". National Science Foundation. http://www.ordovicianatlas.org/atlas/brachiopoda/strophomenata/strophomenida/rafinesquinidae/leptaena/. Retrieved 26 March 2020. 
  5. Global Biodiversity Information Facility
  6. 6.0 6.1 Fossilworks
  7. Catalog of Life

Wikidata ☰ Q2127212 entry