Paracrinoid Information & Paracrinoid Links at HealthHaven.com
advertise
add site
services
publishers
database
health videos
Bookmark and Share

search wiki for    ?
web dir firms image gallery news pdf wiki shop video 
about
toolbar
stats
live show
health store
more stuff
JOIN/LOGIN
Paracrinoid
Fossil range: Early Ordovician - Early Silurian
Comarocystites punctatus
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Crinozoa
Class: Paracrinoidea

Paracrinoids, are extinct marine animals that make up the class Paracrinoidea of the echinoderms (phylum Echinodermata), and are closely related to crinoids. They lived in shallow seas during the Early Ordovician through the Early Silurian.

Paracrinoids are characterized by a mouth with two to five feeding arms arranged asymmetrically, or somewhat bisymmetrically. They have a U-shaped gut, and their anus is located next to the mouth. They have irregularly shaped bodies (theca), and a stem, similar to crinoids, and may have used the stem to attach themselves to a substrate, although some reconstructions show them partially buried in sediment.[1]

Only 13 to 15 genera are known.

[edit] References

  1. ^ Fossil Invertebrates, 1987, Boardman, Richard S., Cheetham, Alan H., and Rowell, Albert J., editors, pp. 580-1. Blackwell Scientific Publications.



Product Results (view all...)

search wiki for    ?
web dir firms image gallery news pdf wiki shop video 



↑ top of page ↑about thumbshots