Jenis Crinoid Feather Stars

More documents

Recommendations

Info

Reproduction and life cycle • They are dioecious, meaning they separate genders and genitalia. • They have no true gonads and reproduce by producing their gametes from genital canals found inside some of the pinnules. • The pinnules then rupture after some time to release the sperm and eggs into the water around them.
• The fertilized eggs then hatch to release free-swimming vitellaria larva. o This larva has rings of cilia running around the body with a tuft of sensory hairs at the upper pole. o There have been some cases where the female crinoid has been known to temporarily brood the larvae using chambers in their arms. • The larva doesn’t feed and lasts only for a few days before it settles at the bottom and attaches itself to the underlying surface using a adhesive gland on its ventral surface. • The larva then metamorphoses into a stalked adult. o Free-swimming feather stars sometimes go through this stage too, with the final stage ending with the adult breaking away from the stalk. • Within 10-16 months, they are able to produce after becoming adults. Ecosystem • They are chiefly deep-sea organisms, mostly inhabiting deep water, usually attached to sediment resting at the bottom of a stream. • They relatively live in environments with plankton
Page 1 and 2: Crinoid Feather Stars Scientific (G
Page 3 and 4: Evolutionary Relationships Fossil C
Page 5: o Their Pinnules arose in several l
Page 8 and 9: o So each arm is a series of ossicl
Page 10 and 11: Locomotion • Most crinoids are fr
Page 14: • Thy approximate 80 surviving sp

Jenis Crinoid Feather Stars

Create successful ePaper yourself

Delete template?

Save as template?