Iocrinus Similis
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''Iocrinus'' is an extinct
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
crinoid Crinoids are marine invertebrates that make up the class Crinoidea. Crinoids that remain attached to the sea floor by a stalk in their adult form are commonly called sea lilies, while the unstalked forms, called feather stars or comatulids, are ...
(sea lilies and feather stars). It is an early
form Form is the shape, visual appearance, or configuration of an object. In a wider sense, the form is the way something happens. Form may also refer to: *Form (document), a document (printed or electronic) with spaces in which to write or enter dat ...
of crinoid, from the
Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ...
rock Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wale ...
of
North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
,
England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
, and
Gilwern Hill, Powys Gilwern Hill is a hill about 3 mi / 5 km southeast of Llandrindod Wells in the county of Powys, Wales. Geology The hill is composed from a range of lower and middle Ordovician volcaniclastic rocks which form a part of the Builth Inlie ...
in
Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
.


Selected species

* '' Iocrinus brithdirensis'' * '' Iocrinus crassus'' * '' Iocrinus pauli'' * '' Iocrinus shelvensis'' * '' Iocrinus similis'' * '' Iocrinus subcrassus'' * '' Iocrinus trentonensis'' * '' Iocrinus whitteryi''


References


Paleobiology Database entry

''Iocrinus'' in the Ordovician of England and Wales
* Stuart M. Kelly, ''Functional Morphology and Evolution of Iocrinus: An Ordovician Disparid Inadunate Crinoid'', Indiana University, 1978. Iocrinidae Ordovician crinoids Ordovician echinoderms of Europe Ordovician echinoderms of North America Paleozoic life of Ontario Verulam Formation {{Paleo-crinoidea-stub