Leptaena Contermina
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''Leptaena'' is an
extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of mid-sized
brachiopod Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, w ...
that existed from the Dariwilian epoch to the Emsian epoch, though some specimens have been found in
strata In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as ei ...
as late in age as the Tournasian epoch.epifaunal Fauna is all of the animal life present in a particular region or time. The corresponding term for plants is ''flora'', and for fungi, it is ''funga''. Flora, fauna, funga and other forms of life are collectively referred to as '' biota''. Zool ...
, 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 Strophomenids.


Distribution

''Leptaena'' fossils have been found on every
continent A continent is any of several large landmasses. Generally identified by convention rather than any strict criteria, up to seven geographical regions are commonly regarded as continents. Ordered from largest in area to smallest, these seven ...
except
Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest contine ...
.subgenera In biology, a subgenus (plural: subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between t ...
. Species in the genus ''Leptaena'' include the following.Catalog of Life
/ref> 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

Prehistoric brachiopods Strophomenida Prehistoric brachiopod genera Ordovician brachiopods Silurian brachiopods Devonian brachiopods Paleozoic animals of Africa Paleozoic animals of Asia Paleozoic animals of Australia Paleozoic animals of Europe Paleozoic animals of North America Paleozoic animals of Oceania Paleozoic animals of South America Paleozoic brachiopods of Africa Paleozoic brachiopods of Asia Paleozoic brachiopods of Europe Paleozoic brachiopods of North America Paleozoic brachiopods of Oceania Paleozoic brachiopods of South America Fossils of Afghanistan Fossils of Argentina Fossils of Australia Fossils of Belarus Fossils of Bolivia Fossils of Canada Paleozoic life of Manitoba Paleozoic life of New Brunswick Paleozoic life of Newfoundland and Labrador Paleozoic life of Nova Scotia Paleozoic life of the Northwest Territories Paleozoic life of Nunavut Paleozoic life of Ontario Paleozoic life of Quebec Paleozoic life of Yukon Fossils of China Fossils of Colombia Fossils of the Czech Republic Fossils of Estonia Fossils of France Fossils of Germany Fossils of Greenland Fossils of Iran Fossils of Ireland Fossils of Italy Fossils of Kazakhstan Fossils of Latvia Fossils of Lithuania Fossils of Libya Fossils of Mexico Fossils of Mongolia Fossils of Morocco Fossils of Myanmar Fossils of New Zealand Fossils of Norway Fossils of Poland Fossils of Portugal Fossils of Russia Fossils of Spain Fossils of Sweden Fossils of Turkey Fossils of Ukraine Fossils of Great Britain Fossils of the United States Fossils of Georgia (U.S. state) Fossils of Venezuela Fossil taxa described in 1828 {{brachiopod-stub