THE EARLIEST ENCRINURID TRILOBITES FROM THE EAST BALTIC AND THEIR TAXONOMIC INTEREST

:  The earliest known representative of the subfamily Encrinurinae, Encrinuroides regularis sp. nov., is described from the glauconitic sandstone of the Mäeküla Member, Billingen Stage (Arenig), from localities in the Baltic‐Ladoga Clint area. Cybele (subfamily Cybelinae) has its earliest appearance...

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Bibliographic Details
Published in:Palaeontology 2006-01, Vol.49 (1), p.155-170
Main Author: Paernaste, Helje
Format: Article
Language:English
Subjects:
Arenig
Baltoscandia
Cybele
Encrinuridae
Encrinuroides
Encrinuroides regularis
Fossils
Ordovician
Paleontology
Taxonomy
Trilobita
trilobite
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Description
Summary::  The earliest known representative of the subfamily Encrinurinae, Encrinuroides regularis sp. nov., is described from the glauconitic sandstone of the Mäeküla Member, Billingen Stage (Arenig), from localities in the Baltic‐Ladoga Clint area. Cybele (subfamily Cybelinae) has its earliest appearance at about the same level, but at different localities, probably indicating their facies dependence. The predominant developing area of the pygidial axis and the general array of spines on the exoskeleton serve to distinguish the Encrinurinae and Cybelinae, but resolve the Staurocephalidae and Dindymeninae within the Encrinuridae. A reassessment of Encrinuroides and the genera recently excluded from it (Frencrinuroides, Physemataspis and Walencrinuroides) sustains the utility of an Encrinuroides sensu lato grouping and endorses Strusz's evolutionary lineages. Encrinuroides uncatus Evitt and Tripp, E. neuter Evitt and Tripp and probably Encrinuroides lapworthi Tripp belong in Erratencrinurus Krueger.
ISSN:0031-0239
1475-4983
DOI:10.1111/j.1475-4983.2005.00535.x