Atrypa is a genus of brachiopod with round to short egg-shaped shells covered with many fine radial ridges (or costae). Growth lines form perpendicular to the costae and are spaced approximately 2 to 3 times further apart than the costae.. The pedunculate valve is slightly convex, but oftentimes levels out or becomes slightly concave toward the anterior margin (opposite the hinge and pedicle). The brachial valve is highly convex. Neither valve contains an interarea (a flat area bordering the hinge line, approximately perpendicular with the rest of the valve). Atrypa had a large geographic range and occurred from the late Lower Silurian (Telychian) to the early Upper Devonian (Frasnian).[4] Other sources expand the range from the Late Ordovician to Carboniferous, approximately from 449 to 336 Ma.[3] A proposed new species, A. harrisi, was found in the trilobite-rich Floresta Formation in Boyacá, Colombia.[5]
atrypa, genus, brachiopod, with, round, short, shaped, shells, covered, with, many, fine, radial, ridges, costae, growth, lines, form, perpendicular, costae, spaced, approximately, times, further, apart, than, costae, pedunculate, valve, slightly, convex, ofte. Atrypa is a genus of brachiopod with round to short egg shaped shells covered with many fine radial ridges or costae Growth lines form perpendicular to the costae and are spaced approximately 2 to 3 times further apart than the costae The pedunculate valve is slightly convex but oftentimes levels out or becomes slightly concave toward the anterior margin opposite the hinge and pedicle The brachial valve is highly convex Neither valve contains an interarea a flat area bordering the hinge line approximately perpendicular with the rest of the valve Atrypa had a large geographic range and occurred from the late Lower Silurian Telychian to the early Upper Devonian Frasnian 4 Other sources expand the range from the Late Ordovician to Carboniferous approximately from 449 to 336 Ma 3 A proposed new species A harrisi was found in the trilobite rich Floresta Formation in Boyaca Colombia 5 AtrypaTemporal range Late Ordovician Carboniferous 449 336 Ma PreꞒ Ꞓ O S D C P T J K Pg NAtrypa reticularis 26mm Eifel GermanyScientific classificationKingdom AnimaliaPhylum BrachiopodaClass RhynchonellataOrder AtrypidaSuborder AtripidinaFamily AtrypidaeGenus AtrypaDalman 1828SpeciesA reticularis Linnaeus 1758 type Anemia reticularis A dzwinogrodensis 1 A devoniana Webster 1921 2 A jukesii 3 A nevadana 3 A oklahomensis 3 A oneidensis 3 A putilla 3 SynonymsCleiothyris Phillips 1841 Mikrothyris Contents 1 Reassigned species 2 Organic content of Atrypa fossils 3 Gallery 4 See also 5 ReferencesReassigned species editAs Atrypa was established in the 18th century many species have since been reassigned 4 A arata Pentamerella arata A aspera var occidentalis Spinatrypa occidentalis A astuta Felinotoechia astuta A congregata Camarotoechia congregata A coralifera Eodictyonella coralifera A depressa Plagiorhyncha glassii A dubia Protorhyncha dubia A elongata Rensselaeria elongata A exigua Protozyga exigua A extans Triplesia extans A flabellites Leptocoelia propria A gruenwaldtiaeformis Nalivkinia gruenwaldtiaeformis A hemiplicata Parastrophina hemiplicata A hemisphaerica Eocoelia hemisphaerica A hircina Hircinisca hircina A hirsuta Parazyga hirsuta A hystrix var occidentalis Spinatrypa occidentalis A increbescens Rhynchotrema increbescens A kolymensis Vagrania kolymensis A laevis Meristella laevis A lens Stricklandia lens A linguifera Antirhynchonella linguifera A medialis Eatonia medialis A modesta Zygospira modesta A nitens Hisingerella nitens A nitida Whitfieldella nitida A nucella Lycophoria nucella A obovata Glassia obovata A obtusiplicata Pectorhyncha obtusiplicata A peculiaris Costellirostra peculiaris A plebeia Dicamara plebeia A pleiopleura Pleiopleurina pleiopleura A prunum Atrypella prunum A recurvirostra Zygospira recurvirostra A scitula Charionella scitula A sordida Cyclocoelia sordida A tumida Meristina tumida A unisulcata Pentagonia peersiiOrganic content of Atrypa fossils editOrganic compounds may be preserved in some Atrypa fossils However only the more stable amino acids tend to be preserved in older Atrypa fossils In specimens of Atrypa reticularis from the Wenlock Shales Lower Silurian alanine glycine glutamic acid leucine isoleucine proline valine and aspartic acid have been found 4 Gallery edit nbsp Atrypa devoniana pedicle valve nbsp Atrypa devoniana brachial valve nbsp Atrypa devoniana anterior view nbsp Atrypa devoniana posterior view nbsp Atrypa devoniana lateral view nbsp Atrypa sp Couvinian Middle Devonian El Pical Leon Spain Eroded to show spiralia on the right See also edit nbsp Paleontology portalReferences edit Paleobiodiversity in Baltoscandia Atrypa Atrypa reticularis fossiilid info Retrieved 2012 03 22 M A Stainbrook 1945 Brachiopoda of the Independence Shale of Iowa Geological Society of America Memoirs Vol 14 ISBN 0813710146 a b c d e f Atrypa at Fossilworks org a b c Moore R C 1965 Brachiopoda Treatise on Invertebrate Paleontology Vol Part H Volume 1 and 2 Boulder Colorado Lawrence Kansas Geological Society of America University of Kansas Press ISBN 0 8137 3015 5 Floresta Series Fauna at Fossilworks org nbsp This brachiopod related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Atrypa amp oldid 1189924754, wikipedia, wiki, book, books, library,
