Leptaena is an extinct genus of mid-sized brachiopod that existed from the Darriwilian to the Emsian,[ Paleobiology Database] Like some other Strophomenida, Lepteana were , meaning they lived on top of the seafloor, not buried within it, and were suspension feeders.
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.
Their width is usually greater than their length, like most
Strophomenida.
Distribution
Leptaena fossils have been found on every
continent except
Antarctica.
[ Global Biodiversity Information Facility]
Species
Leptaena was a diverse genus, with over 70 recognized species and subgenus. Species in the genus Leptaena include the following.[ Catalog of Life] Any synonymous genera to which a given species may belong to are labelled with the synonymous genus in parentheses.
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Leptaena acuta (Roomusoks, 2004)
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L. acuticuspidata Amsden, 1958
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L. aequalis Amsden, 1974
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Leptaena alliku (Oraspold, 1956)
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Leptaena altera Rybnikova, 1966
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Leptaena amelia (Havlicek, 1967)
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L. analogaeformis Biernat, 1966
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Leptaena arberae Kelly, 1967
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L. argentina (Thomas, 1905)
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L. bergstroemi Cocks, 2005
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L. borghiana Mergl & Massa, 1992
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Leptaena boyaca Caster, 1939
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L. contermina Cocks, 1968
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Leptaena convexa Weller, 1914
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Leptaena cooperi Easton et al., 1958
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L. crassorugata (Similoleptaena) (Rõõmusoks, 2004)
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Leptaena croma (Havlicek & Storch, 1990)
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Leptaena crypta Opik, 1930
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L. cryptoides (Oraspold, 1956)
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Leptaena dejecta (Baarli, 1995)
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L. delicata Amsden, 1949
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L. depressa (Sowerby, 1825)
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L. diademata (Williams, 1962)
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Leptaena electra (Havlicek, 1967)
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L. ennessbe Spjeldnaes, 1957
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L. enucleata Klenina, 1984
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L. friedrichi (Similoleptaena) (Rõõmusoks, 2004)
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Leptaena gibbosa (James, 1874)
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L. haverfordensis Bancroft, 1949
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L. holcrofti Bassett, 1974
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L. indigena Spjeldnaes, 1957
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L. infrunita (Williams, 1962)
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Leptaena ingrica (Rõõmusoks, 2004)
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L. juvenilis (Öpik, 1930)
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L. kentuckiana Pope, 1982
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Leptaena lappa (Havlicek & Storch, 1990)
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Leptaena lappina (Havlicek & Storch, 1990)
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L. laterorugata (Kurnamena) (Roomusoks, 1989)
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L. lemniscata (Havlicek, 1967)
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L. limbifera (Havlicek, 1967)
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L. martinensis Cocks, 1968
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L. moniquensis Foerste, 1924
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L. nanaformis Zhang et al., 1983
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L. nassichuki Smith, 1980
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Leptaena odeon Havlicek, 1967
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L. oklahomensis Amsden, 1951
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L. ordovicica (Cooper, 1956)
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Leptaena orhor (Havlicek & Storch, 1990)
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Leptaena palmrei (Roomusoks, 2004)
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L. parvirugata Hoel, 2005
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L. parvissima Ivanovskii & Kulkov, 1974
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L. paucirugata (Roomusoks 1989)
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L. pertenuis (Similoleptaena) (Rõõmusoks, 2004)
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L. planitia (Similoleptaena) (Rõõmusoks, 2004)
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L. poulseni Kelly, 1967
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L. praequalis Rozman, 1977
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L. provellerosa (Havlicek & Storch, 1990)
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L. purpurea Cocks, 1968
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L. quadrata Bancroft, 1949
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L. quadrilatera (Logan, 1863)
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Leptaena rara (Alekseeva and Erlanger, 1983)
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Leptaena reedi Cocks, 1968
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L. rhomboidalis (Wahlanberg, 1818)
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L. richmondensis Foerste, 1909
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L. roomusoki Cocks, 2005
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Leptaena rugata (Lindström, 1861)
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L. rugaurita (Havlicek, 1967)
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Leptaena rugosa (Dalman, 1828)
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L. rugosides Oraspold, 1956
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L. salopiensis (Williams, 1963)
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L. semiradiata Sowerby, 1842
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Leptaena senecta Roomusoks, 2004
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Leptaena sperion Bassett, 1977
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L. spumiferra (Kurnamea) (Opik, 1930)
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Leptaena strandi (Spjeldnaes, 1957)
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L. tarwanpensis (Similoleptaena) (Rõõmusoks, 2004)
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Leptaena taxilla (Oraspold, 1965)
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L. tenuissimestriata McCoy, 1852
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L. tenuistrata Sowerby, 1839
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L. tenuistriata (de Sowerby and Murchison, 1839)
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L. trifidium (Leptaenopoma) (Marek and Havlíček, 1967)
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L. trifidum (Marek and Havlíček, 1967)
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Leptaena undosa (Rõõmusoks, 2004)
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L. valentia (Cocks, 1968)
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Leptaena valida Bancroft, 1949
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L. veldrensis Spjeldnaes, 1957
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L. vellerosa Havlicek, 1967
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L. ventricosa Williams, 1963
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Leptaena zeta Lamont, 1947
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L. ziegleri Cocks, 1968
