Gastropod diversity Flashcards
What are gastropods most likely ancestor?
Prosobranchia
What is opisthobranchia?
- the detorsion and reduction or loss of shell, operculum, mantle cavity and ctenidia of gastropods
- ex. pteropods
What are the gills in gastropods called?
ctenidia
What is mucus used for in gastropods?
- used for locomotion
- used by pteropods for suspension feeding on marine snow
- used for communication
- used to prevent desiccation
- and trap food (in protobranchia)
What is the pulmonata
- mantle cavity, which evolved into a lung
- present in gastropods that have lost gill ctenidia
Gastropods are sexually…
simultaneous hermaphrodites
What are the two defining characteristics of class bivalvia of phylum mollusca
- two valved shell
- laterally compressed body
What is the purpose of having two shells in bivalvia?
for protection but also is used for locomotion
Bivalvia lack …..
cephalization
most of bivalvia are _____ feeders, as they are _______
SUSPENSION FEEDERS, AS THEY ARE SEDENTARY SOMEWHAT
What are the three groups of bivalves? What are they based on?
- groups based on feeding type
1. protobranchia
2. lamellibranchia
3. anomalodesmata
Describe protobranchia
- group within bivalves
- deposit feeders, used feeding tentacles covered in muscus to collect food
- simple ctendia
Describe lamellibranchia
- group within bivalves
- suspension feeders
- gills act at sieves for food
Describe anomaldesmata
- group within bivalves
Class scaphopoda belongs to phylum
mollusca
What are the defining characteristics of class scaphopoda
- conical shell open at both ends
- captacula, used for deposit feeding
- loss of gills/ctendia, circulatory system, and osphradium
