Antedon

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Antedon
Temporal range: Cretaceous - Recent
Antedon mediterranea (Lamarck, 1816).jpg
Antedon mediterranea
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Crinoidea
Subclass: Articulata
Family: Antedonidae
Genus: Antedon
de Freminville, 1811 [1]
Species
See text.

Antedon is a genus of free-swimming, stemless crinoids. The genus first appeared in the fossil record in the Cretaceous period.[2]

Characteristics[edit]

Members of this genus have no stems but have five pairs of feathery arms arising from a central concave disc. There are a number of cirri or unbranched appendages on a low, cone-shaped dorsal ossicle, a bone-like structure in the centre of the disc. The mouth and the ambulacral grooves are also on the upper surface. Clawed cirri on the lower surface provide temporary attachment to the substrate.[3] There is great variability in the morphological features in Antedonids found in different habitats and the main distinguishing feature among the species is the number of cirri.[4]

Species[edit]

The following species are recognised in the World Register of Marine Species:[1]

References[edit]

  1. ^ a b Antedon - de Freminville, 1811 World Register of Marine Species. Retrieved 2011-10-13.
  2. ^ Antedon pinnulata The Fossil Museum. Retrieved 2011-10-13.
  3. ^ Family Antedonidae Marine Species Identification Portal. Retrieved 2011-10-13.
  4. ^ De Domenicoa, F.; S. Giacobbea; P. Rinellib (2009). "The genus Antedon (Crinoidea, Echinodermata) in the Strait of Messina and the nearby Tyrrhenian Sea (Central Mediterranean)". Italian Journal of Zoology. 76 (1): 70–75. doi:10.1080/11250000802086011.