A lower Silurian (Llandovery) diplobathrid crinoid (Camerata) from mid-Wales

doi:10.1017/S0016756819001511

	A lower Silurian (Llandovery) diplobathrid crinoid (Camerata) from mid-Wales
	Fearnhead, Fiona E.2,3; Donovan, Stephen K.4; Botting, Joseph P.1,5; Muir, Lucy A.1
刊名	GEOLOGICAL MAGAZINE
	2020-07-01
卷号	157 期号:7 页码:1176-1180
关键词	systematics Dimerocrinitidae Euptychocrinus preservation Telychian
ISSN号	0016-7568
DOI	10.1017/S0016756819001511
通讯作者	Donovan, Stephen K.(Steve.Donovan@naturalis.nl)
英文摘要	Early Palaeozoic crinoids are known only patchily from the British Isles except for accumulations at starfish beds. A single, exquisitely preserved crinoid is reported from the Telychian (Llandovery, Silurian) of the Pysgotwr Grits Formation of the Llangurig area, Powys, mid-Wales. This sedimentary succession is turbiditic in origin and poorly fossiliferous. The crinoid is a diplobathrid camerate,Euptychocrinus longipinnulussp. nov., preserved as an external mould without counterpart. It has a high, shuttlecock-like crown; a conical, unsculptured cup; low infrabasals; a pair of long, slender, feather-like arms on each ray, each bearing numerous long pinnules; and a heteromorphic column. Most previous reports of this genus have been from the Upper Ordovician - lower Silurian series of Laurentia; uncertainly, it is described from the Upper Ordovician deposits of Morocco (Gondwana).Euptychocrinus longipinnulusis the first Avalonian occurrence. The beautiful preservation of the arms, including cover plates of pinnules, contrasts with the proxistele, which is a series of 'broken sticks'. This crinoid responded to an adverse environmental fluctuation, probably a turbidity current, by autotomizing the stem, but it was carried downslope and buried alive.
WOS关键词	FAUNA ; STALK
WOS研究方向	Geology
语种	英语
出版者	CAMBRIDGE UNIV PRESS
WOS记录号	WOS:000546620700011
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/38626]
专题	中国科学院南京地质古生物研究所
通讯作者	Donovan, Stephen K.
作者单位	1.Amgueddfa Cymru Natl Museum Wales, Dept Nat Sci, Cathays Pk, Cardiff CF10 3NP, Wales 2.Nat Hist Museum, Angela Marmont Ctr, Cromwell Rd, London SW7 5BD, England 3.Garden Flat,61a,Highgate West Hill, London N6 6BU, England 4.Nat Biodivers Ctr, Taxon & Systemat Grp, Postbus 9517, NL-2300 RA Leiden, Netherlands 5.Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Fearnhead, Fiona E.,Donovan, Stephen K.,Botting, Joseph P.,et al. A lower Silurian (Llandovery) diplobathrid crinoid (Camerata) from mid-Wales[J]. GEOLOGICAL MAGAZINE,2020,157(7):1176-1180.
APA	Fearnhead, Fiona E.,Donovan, Stephen K.,Botting, Joseph P.,&Muir, Lucy A..(2020).A lower Silurian (Llandovery) diplobathrid crinoid (Camerata) from mid-Wales.GEOLOGICAL MAGAZINE,157(7),1176-1180.
MLA	Fearnhead, Fiona E.,et al."A lower Silurian (Llandovery) diplobathrid crinoid (Camerata) from mid-Wales".GEOLOGICAL MAGAZINE 157.7(2020):1176-1180.