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Popov et al., 1999

The earliest atrypides and athyridides (Brachiopoda) from the Ordovician of Kazakhstan

Popov, L. E., Nikitin, I. F., Sokiran, E. F.
DOI
DOI10.1111/1475-4983.00089
Year1999
JournalPalaeontology
Volume42
Number4
Pages625-661
Typearticle in journal
LanguageEnglish
Id830

Abstract

The middle Ordovician brachiopod faunas of Kazakhstan provide one of the most complete records of the evolution and radiation of some of the oldest known spire-bearing brachiopods. By contrast with North American faunas, Kazakhstanian atrypide taxa mostly belong to the suborders Atrypidina and Lissatrypidina, whereas the suborder Anazygidina is completely absent. Kazakhstanian species referred previously to Zygospira Kuzgunia are reassigned to Sulcatospira, which appeared in the Caradoc Diplograptus multidens Climacograptus clingani biozones (Sulcatospira? praecursor and Sulcatospira prima sp. nov.). Primitive, and possibly the oldest known Athyridida also appeared in Kazakhstan sometime during the Caradoc (Kellerella misiusi sp. nov.) and became widespread in brachiopod assemblages developed in carbonate mud mounds. Phylogenetic analysis suggests the early divergence of the Anazygidina, Atrypidina and Athyridida, which probably evolved independently from various primitive smooth Lissatrypidina. The new atrypide subfamily Pectenospirinae and two new atrypide genera (Rozmanospira gen. nov. and Pectenospira gen. nov. with P. pectenata sp. nov. as type species) are erected.

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