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A stalked crinoid (white) and a comatulid (red) in deep sea, showing the differences between these two sister groups. Most modern crinoids, i.e., the feather stars, are free-moving and lack a stem as adults. Examples of fossil crinoids that have been interpreted as free-swimming include Marsupites, Saccocoma and Uintacrinus. [23]
Articulata are a subclass or superorder within the class Crinoidea, including all living crinoid species. They are commonly known as sea lilies (stalked crinoids) or feather stars (unstalked crinoids). The Articulata are differentiated from the extinct subclasses by their lack of an anal plate in the adult stage and the presence of an ...
Crinozoa is a subphylum of mostly sessile echinoderms, of which the crinoids, or sea lilies and feather stars, ... "Morphology and evolution of blastozoan echinoderms".
Cenometra bella is a species of crinoids belonging to the genus Cenometra.They can have up to 30 arms [2] and can be of variable colours but are often characterised by a marked contrast between the extending free-arms and the feathery pinnules (for example, dark brown and white). [2]
This waving action flings the particles away from the crinoid's mouth, keeping it clean. [9] Along the ocean floor, E. parrae is often preyed upon by pencil urchins such as Calocidaris micans. [2] The stomachs of C. mican collected around E. parrae contained large amounts of crinoid stems and soft
Antedon is a genus of sessile, stemless crinoids. The genus first appeared in the fossil record in the Cretaceous period. [2] Characteristics
Comatulida is an order of crinoids. Members of this order are known as feather stars and mostly do not have a stalk as adults. The oral surface with the mouth is facing upwards and is surrounded by five, often divided rays with feathery pinnules. Comatulids live on the seabed and on reefs in tropical and temperate waters.
This family is of recent restoration, and still has no consensual description. However the description of the family Comasteridae remains partially valid.. This family counts between 93 and 95 species, distributed in 21 genera, [2] which makes it the second most diversified family of crinoids the behind Antedonidae, representing approximately 1/6th of known crinoid species.