Sea cucumber Cucumaria : Sea cucumber Cucumaria
Slide 2 : Examples ….
Holothuria,
Cucumaria,
Sclerodactyla and
Thyone
An interesting communalistic relation exists between some sea cucumbers and a small fish called Carapus which takes shelters in the cloaca and respiratory tree of the sea cucumber.
Class : Crinoidea : Class : Crinoidea Sea lilies and feather stars
With several primitive characters.
Fossil records : Crinoids were more numerous than they are now
Body is attached to substratum by a stalk (cirri) with aboral surface.
Sea lilies(cenocrius) were also found 500mya : Sea lilies(cenocrius) were also found 500mya
Feather starAntedon : Feather starAntedon
Slide 6 : Mouth /anus is on the oral surface
No Madreporite
Respiration by tube feet (no suckers).
No Spines or Pedicellariae.
Separate Sexes.
Doliolaria (free swimming) and Pentacrinoid larval forms
Examples
Antedon,
Neometra,
Cenocrinus.
Class : Concentricycloidea : Class : Concentricycloidea These small (< 1 cm. diameter) disc shaped animals
Discovered around New Zealand, called sea daisies.
Described in 1986 as a class of echinoderms.
They have no arms or anus.
Example include Xylopax
Xylopax : Xylopax
Larvae of echinoderms : Larvae of echinoderms
Slide 10 : That is all about the non-chordates