Hemichordates Flashcards
1
Q
important developmental features (5)
A
- radial cleavage
- deuterosomes
- no photoreceptors
- segmentation- gill pores repeated
- coelom w/ 3 partitions
2
Q
Acorn worms (enteropneusts) (5)
A
- vermiform
- proboscis
- shallow water/intertidal
- burrowers
- deposit feeders
3
Q
Pterobranchs (4)
A
- tube building
- colonial
- cold deep water
- sessile filter feeders
4
Q
hemichordate shared characteristics (4)
A
- trunk
- collar
- gill slits
- marine
5
Q
phylogeny
A
- mid-cambrian fossil > Phylum
- sister group to echinoderms
6
Q
Skin brain
A
genes coding for development of fore, mid and hind brain in vertebrates are VERY SIMILAR to genes coding for proboscis, collar and trunk/collar boundary
