Enigmatic Syringocrinus Carpoid Fossils Assemblage

from Ordovician Trenton Group of Canada

Syringocrinus paradoxicus

Phylum Echinodermata (?), Class Homiostelea, Order Soluta

Geological Time: Upper Ordovician

Size mm (25.4 mm = 1 inch) Fossils are 20 mm to 60 mm long (if straight) on a 200 mm by 160 mm matrix

Fossil Site: Neuville Formation, Trenton Group, Quebec City, Canada

Fossil Code: STF21

Price: Sold

Syringocrinus paradoxicusDescription:The extinct carpoids are an informal grouping of Paleozoic fossils that closely resemble echinoderms, but lack radial symmetry. However, their classification remains controversial and they have been variously postulated to have been stem groups of other groups such as the basal deuterostomes or the craniates, tunicates, acraniates and chordates.

Carpoids are known from the Middle Cambrian to Early Devonian. Carpoids are distinct from all other animals, extant and extinct, because of their complete asymmetry, internally and This is an assemblage of the solute carpoid Syringocrinus paradoxicus from the Upper Ordovician of Canada. It is thought to have lived a benthic existence, stretched out on the seafloor, with the arm presumably grubbing up organic detritus. It is a rare member of the Trenton group, making a multiple such as this even more of a rarity.

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