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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:
Mespilocystites BL109
Mespilocystites OZ251
Mespilocystites BL107
Mespilocystites OZ229
Mikrofaciální vzorek s crinoidy HF1107
Minicrinus inflatus Prokop, 1970Prokop (1970), Pl. XIV, fig. 4-7 RP41
Minicrinus inflatus Prokop, 1970Prokop (1970), Pl. XV, fig. 1-3 RP42
Minicrinus inflatus Prokop, 1970Prokop (1970), Pl. XIV, fig. 1-3 RP40
Minicrinus oblongus Prokop, 1970 RP127
Minicrinus oblongus Prokop, 1970Prokop (1970), Pl. XV, fig. 4-6 RP43
Minicrinus oblongus Prokop, 1970Prokop (1970), Pl. XV, fig. 7-9 RP44
MinicrinusProkop (1970), Pl. XIV, fig. 8-9 RP45
Minicrinus RP124
Minicrinus RP123
OrthogonocrinusNekvasilová a Prokop (1963), Pl. I, fig. 6 (NP78) RP78
ParacyclocaudexUreš et al. (1999), fig. 1B HL51
Parapisocrinus quinquelobus p5877
PentacauliscusUreš et al. (1999), Pl. 1, fig. 30 HL50
Periechocrinites JH345
Pernerocrinus paradoxus p4915
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]