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Crinoidea (Crinoids)

      Crinoids are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). Crinoidea comes from the Greek word krinon, "a lily", and eidos, "form". They live both in shallow water and in depths as great as 6,000 meters. Sea lilies refer to the crinoids which, in their adult form, are attached to the sea bottom by a stalk. Feather stars or comatulids refer to the unstalked forms. Crinoids are characterized by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognized, most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults. There are only a few hundred known modern forms, but crinoids were much more numerous both in species and numbers in the past. Some thick limestone beds dating to the mid- to late-Paleozoic are almost entirely made up of disarticulated crinoid fragments.

Source: http://en.wikipedia.org/wiki/Crinoidea
lilijice
Img. 81:
Cyclicii PB2
Dimerocrinitidae Zittel, 1879AD Štorch, Manda, Loydell, 2014 YA2971
Dimerocrinitidae Zittel, 1879AD Štorch, Manda, Loydell, 2014 YA2970
Eohalysiocrinus convexus Prokop, 1970Prokop (1970), Pl. VIII, fig. 1-4 RP28
Eohalysiocrinus convexus Prokop, 1970Prokop (1970), Pl. IX, fig. 1 - 2 RP47
Eohalysiocrinus convexus Prokop, 1970Prokop (1970), Pl. VIII, fig. 5-8 RP29
Eohalysiocrinus convexus Prokop, 1970Prokop (1970), Pl. VIII, fig. 9 RP46
Eohalysiocrinus cylindricus Prokop, 1970Prokop (1970), Pl. XII, fig. 7-9 RP36
Eohalysiocrinus cylindricus Prokop, 1970 RP142
Eohalysiocrinus cylindricus Prokop, 1970 RP128
Eohalysiocrinus cylindricus Prokop, 1970Prokop (1970), Pl. XIII. , fig. 4-5 RP52
Eohalysiocrinus cylindricus Prokop, 1970 RP129
Eohalysiocrinus cylindricus Prokop, 1970Prokop (1970), Pl. XIII, fig. 1-3 RP37
Eohalysiocrinus cylindricus Prokop, 1970 RP148
Eohalysiocrinus cylindricus Prokop, 1970 RP139
Eohalysiocrinus cylindricus Prokop, 1970 RP140
Eohalysiocrinus holynensis Prokop, 1970 RP134
Eohalysiocrinus holynensis Prokop, 1970Prokop (1970), Pl. XIII, fig. 6-8 RP38
Eohalysiocrinus holynensis Prokop, 1970Prokop (1970), Pl. XIII, fig. 9-10 RP39
Eohalysiocrinus latus Prokop, 1970Prokop (1970), Pl. IX, fig. 7-8 RP31
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]