Crinoidea

Insights into the taxonomy and paleoecology of the 'bead bed' crinoid (Echinodermata: Crinoidea) based on new material from the lower Silurian Brassfield Formation of east-central Kentucky.

Kirjeldatud uus okasnahksete perekond ja liik Elgaecrinus uralicus (Crotalocrinitidae, Crinoidea, Echinodermata) on leitud Lochkovi lademe riffmoodustistest Kesk-Uurali laanenolval.

Lastly, we did not observe a statistically significant difference in interhabitat abundances of the unidentified black Crinoidea.

Echinodermata Klein, 1734 Crinoidea Miller, 1821 Isselicrinus sp.

Table 1 Survey of individuals (N=242) Number of Percentage of Individuals Total Fauna Brachiopoda 93 38.430 Rugosa 94 38.843 Blastoidea 29 11.983 Crinoidea 25 10.331 Gastropoda 1 0.413

Although visceral mass separation in Crinoidea was described over 100 years ago (Dendy, 1886), its causes and functions remain unknown.

Class CRINOIDEA Miller, 1821 Subclass CLADIDA Moore and Laudon, 1943 Order DENDROCRININA Bather, 1899 Superfamily MASTIGOCRINACEA Jaekel, 1918 Family MASTIGOCRINIDAE Jaekel, 1918 Genus GONIOCRINUS Miller and Gurley, 1890 GONIOCRINUS SAETTII new species

A Natural History of the Crinoidea of Lily Shaped Animals, with Observations on the Genera Asteria, Euryale, Comatula, and Marsupites.

The fine structure of the ovary of the feather star Nemaster rubiginosa (Echinodermata, Crinoidea).

Table 1 Incidence of intragonadal development in the Echinodermata Class Reference Crinoidea Comatilia iridometriformis Messing (1984) Holothuroidea Leptosynapta clarki Sewell and Chia (1994) Oneirophanta mutabilis Hansen (1968) Taeniogyrus contortus Vaney (1925) Trachythyone mira Ludwig and Heding (1935) O'Loughlin (2002) Ophiuroidea Amphiura microplax Mortensen (1936) Amphiura monorima Mortensen (1936) Astrochlamys sol Madsen (1967) Ophionotus hexactis Mortensen (1921) Asteroidea Cryptasterina pacifica Komatsu et al., (1990) Cryptasterina hystera Byrne et al.

Morphological basis and mechanics of arm movement in the stalked crinoid Metacrinus rotundus (Echinodermata, Crinoidea).

Mechanisms of arm regeneration in Antedon mediterranea (Echinodermata, Crinoidea).

The locomotion of the comatulid Florometra serratissima (Echinodermata: Crinoidea) and its adaptive significance.

However, there are no significant differences among the taxonomic classes (excluding Crinoidea with only a single species) in egg size (P = 0.165) or energy content (P = 0.124).