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Titolo:
Evolution of the late Ordovician orthid brachiopod Gnamptorhynchos Jin, 1989, from Platystrophia King, 1850, in North America
Autore:
Jin, JS; Zhan, RB;
Indirizzi:
Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada Univ Western Ontario London ON Canada N6A 5B7 London, ON N6A 5B7, Canada Acad Sinica, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China Acad Sinica Nanjing Peoples R China 210008 njing 210008, Peoples R China
Titolo Testata:
JOURNAL OF PALEONTOLOGY
fascicolo: 6, volume: 74, anno: 2000,
pagine: 983 - 991
SICI:
0022-3360(200011)74:6<983:EOTLOO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Jin, JS Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada Univ Western Ontario London ON Canada N6A 5B7 ON N6A 5B7, Canada
Citazione:
J.S. Jin e R.B. Zhan, "Evolution of the late Ordovician orthid brachiopod Gnamptorhynchos Jin, 1989, from Platystrophia King, 1850, in North America", J PALEONTOL, 74(6), 2000, pp. 983-991

Abstract

Gnamptorhynchos, a rhynchonellid-like orthid brachiopod, evolved from Platystrophia in Maysvillian (early Ashgill) time, and survived both the end-Richmondian and end-Hirnantian episodes of the latest Ordovician mass extinction. The name of the type species of Gnamptorhynchos, G. inversum Jin, 1989, is rejected and replaced by Gnamptorhynchos globatum (Twenhofel, 1928), which is a senior synonym. Gnamptorhynchos manitobensis new species is described here from the Selkirk Member (Maysvillian) of the Red River Formation,southern Manitoba. The new species is characterized by a transversely extended, strongly biconvex to globular shell with prominent umbones, relatively numerous costae and a notothyrial cavity supported dorsally by a short median ridge. It constituted part of a Late Ordovician epicontinental fauna that once spread widely in shallow, equatorial seas of North America. The new species is a morphological intermediate between Platystrophia and Gnamptorhynchos, with Platystrophia-like interareas, hingeline, and cardinal process, but Gnamptorhynchos-like shell posterior and notothyrial platform. Previously, Gnamptorhynchos was known from Hirnantian to mid-Aeronian rocks. The new species extends the lower range of the genus to Maysvillian.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 22:18:18