Gnathiferans Flashcards
1
Q
how does a pseudocoelomate cross section compare to that of an Annelid?
A
- walls that divide coelom broke down
- pseudocoelom consists of blastocoelic material
2
Q
what features did pseudocoelomates lose secondarily?
A
- coeloms and all derived functions
- blood vessels
- metanephridia
3
Q
what classes are within Rotifora?
A
Monogononta, Bdelloidea, Seisonidae
4
Q
what does Rotifora mean?
A
“wheel bearers”
5
Q
what are the traits of Rotifora?
A
- corona (ciliated ring) for feeding
- straight digestive tract
- “toes” for attachment
- gonochoristic
- syncytial cuticle (plasma membranes of cells merge together into one cytoplasm)
- eutely (fixed number of cells at maturity)
6
Q
describe trophi and their purpose
A
- secreted from pharynx
- hardened biting structures for grasping, crushing or piercing prey
- connected to muscle that can contract or extend trophi
7
Q
what are Acanthocephalans?
A
spiny headed parasitic organisms
8
Q
what traits does Acanthocephala have?
A
- no corona
- no digestive tract (ends at pharynx)
- no trophi
- spiked proboscis
- especially large reproductive system
9
Q
what traits does Gnathostomulida have?
A
- marine
- benthic
- no corona
- trophi
- deposit feeders
- eutelic
10
Q
what phyla are under Gnathifera?
A
- Rotifora
- Gnathostomulida
- Micrognathozoa
- Acanthocephala
11
Q
What are two other phyla similar to these groups of animals?
A
Cycliophora and Gastrotricha
12
Q
what features does Cycliophora have?
A
- straight digestive system
- suspension feeders using buccal funnel (cilia ring)
- adhesive disc on posterior
- niche is on crustacean mouths
- males are ectoparasites on females
13
Q
what features does Gastrotricha have?
A
- deposit feeders
- ciliated anterior end for feeding
- uses cilia on ventral to crawl
