Abstract
Four species of myodocope ostracod are documented from the Silurian Ludlow Series of the Aburtkan gorge on the southern slope of Dzhalpak Mountain, Uzbekistan: namely,Parabolbozoe bohemica(Barrande, 1872),Bolbozoe anomalaBarrande, 1872,Silurocypridina calvaPerrier, Vannier and Siveter, 2011 andRichteria migrans(Barrande, 1872). These species have a palaeogeographically widespread trans-oceanic distribution, which supports the notion that Silurian myodocopes signify the earliest zooplanktonic ostracods.Richteria migrans(Barrande, 1872), in particular, provides a precise intercontinental biostratigraphic marker that identifies rocks of the upper Gorstian to upper Ludfordian stages.
Highlights
During the 1980s and 1990s analysis of distributional and facies data of Silurian myodocopes suggested that some species had colonised pelagic niches during that time and represented the earliest known record of zooplanktonic ostracods (Siveter, 1984; Siveter et al, 1987, 1991; Siveter and Vannier, 1990; Vannier and Abe, 1992; see Perrier et al, 2015)
Fieldwork undertaken by the present authors in 2014 yielded many additional Silurian myodocope specimens and newly recorded species from the locality at Kanda, and these are the basis of the present paper
Based on inter-regional correlation of the myodocope ostracods that we identify from the locality at Kanda, its Silurian rocks are most likely at the level of the Saetograptus incipiens, Saetograptus leintwardinensis and Monograptus formosus graptolite biozones of the Ludlow Series
Summary
During the 1980s and 1990s analysis of distributional and facies data of Silurian myodocopes suggested that some species had colonised pelagic niches during that time and represented the earliest known record of zooplanktonic ostracods (Siveter, 1984; Siveter et al, 1987, 1991; Siveter and Vannier, 1990; Vannier and Abe, 1992; see Perrier et al, 2015). Brief mentions occur in the unpublished theses of Mikhailova (1972, 2000), which list three species of Cypridina Milne-Edwards, 1840 from the.
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