Originally published in: Časopis Národního muzea, Řada přírodovědná, 168 (1-4): 135-136. Praha 1999
Rudolf J. Prokop1 - Václav Petr2
During current research of the crinoid assemblages from the tuffites
and tuffitic limestones of the Kopanina Formation (Ludlow), a few calyces
and crowns of carpocrinid crinoids have been discovered in the quarries
"Amerika" near Karlštejn. These remains belong most probably to the species
Carpocrinus ornatus (Angelin, 1878) recorded previously from the Silurian
of Gotland (Sweden).
Type species: Actinocrinites simplex PHILLIPS in MURCHISON,
1839, Silurian (Wenlock), England
Material: One almost complete crown (cat. No. L 8991) and one calyx (cat. No. L 33134); both specimens isolated from the tuffitic limestone. They are deposited in the repository of the Palaeontological Department of the National museum, Praha.
Remarks: The remains of Carpocrinus ornatus (Angelin,
1878) found in the Czech Silurian (Barrandian area) correspond exactly
with the specimens from the Silurian of Gotland. The calyx of the Czech
specimens is built by thick calyx plates bearing bulbous central swellings
of the external surface. BB are poorly preserved so that the description
of their exact shape and number is impossible. As in the Gotland specimens,
the first PBr is quadrangular, and the CD interray possesses a typical
median series of anal plates. Fixed SBrBr are three, interprimibrachs about
12, merging into the tegmen. Tegmen is solid, orals and ambulacrals distinct
and well-discernible. Free arms are not very complex, two in each ray,
uniserial, with simple brachials. Proximal portion of the column is poorly
preserved, cylindrical to slightly pentalobate in outline.
L 33143 - 24 - 22
Fig. 1: Carpocrinus ornatus (Angelin, 1878), specimen cat. No. L 8991. Tuffitic limestones of the Kopanina Formation (Encrinurus beaumonti Zone), "Amerika" quarries near Karlštejn. Barrandian, Czech Republic (Photo by R. J. Prokop).
Angelin, N. P. (1878): Iconographia crinoideorum in stratis Sueciae Siluricis fossilium. - Samson et Wallin (Holmiae), 62 pp., 29 pls. Stockholm.
Růžička, R. - Bouška, J. (1944): Zkameněliny z českého siluru z lomu "Amerika" u Vel. Mořiny. – Věda přírodní, 22, 7: 189-193. (In Czech).
Ubaghs, G. (1978): Camerata. In: Treatise on Invertebrate Paleontology, (ed. R. C. Moore and C.Teichert), Part T, Echinodermata 2, Vol. 2: T462-66. Boulder, Colorado and Lawrence, Kansas.