Rod Haplocrinites Steininger, 1837 (Crinoidea) v devonu Ceskeho masivu

The occurrence of widely distributed inadunate crinoids of the genus Haplocrinites Steininger, 1837 is confirmed for the first time in the Middle Devonian (Eifelian) strata of the Bohemian Massif. Ten species are currently known all over the world; six of them are reported from the Givetian, probably the acme for the genus. The stratigraphic range of Haplocrinites is from Middle Devonian (Eifelian) to Early Carboniferous (Tournaisian). The genus is known from Europe (Germany, Poland, France, Spain and England), North Africa (Algeria, Morocco), North America (U.S.A) and Asia (Uzbekistan, China).
The unique specimen described and illustrated in this paper (Fig. 2 and 3) was found at the locality Koněprusy - „Červený lom” (Fig. 1), south of Beroun. It is deposited in the collection of the Palaeontological Department of the National Museum, Prague under the number NM-L 46509. The specimen represents an almost complete single calyx, which comes from basal layers of Acanthopyge limestone (Choteč Formation, lower Eifelian) of the Barrandian area. It is preserved on the bedding surface of weakly weathered bioclastic limestone. Associated fauna, including trilobites Cyphaspis holynensis Růžička; Aulacopleura bohemica Přibyl; Kettneraspis pigra Barrande; Thysanopeltis speciosa Hawle et Corda and Phaetonellus planicauda Barrande confirm the Eifelian Stage. On the other hand, a previous report of Haplocrinites from the Uppermost Emsian of Bohemia (Prokop 1992) has not been verified.
The cup recorded is roughly bowl-shaped, and rounded. It has a circular stem facet and minute lumen, five basals, and two simple and three compound radials. Super radials are distinctly larger than inferradials. The cup has no anal plate. The upper part of radials and tegmen are not preserved, so we left this specimen in open nomenclature as Haplocrinites sp.

References

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