Question 1: However, all molluscan shells are formed from the ectoderm (outer layer of the embryo); in ________, for example, an invagination of the ectoderm forms during the embryonic period, resulting in a shell that is internal in the adult.
Question 2: About 800 distinct living ________ of cephalopods have been identified.
Question 3: Subclass ________ (490.0 Ma- Rec)
Question 4: The largest group of shelled cephalopods, the ________, are extinct, but their shells are very common as fossils.
Question 5: What phylum does Cephalopod belong to?
Order † Plectronocerida: the ancestral cephalopods from the ________ Period
Question 7: None of them can tolerate freshwater, but the brief squid, Lolliguncula brevis, found in ________ may be a notable exception in that it tolerates brackish water which has a low salinity.
Question 8: Order † ________ (215.0-66.0 Ma)
Question 9: In the Coleoidea, the mollusk shell has been internalized or is absent; this subclass includes the octopus, squid, and ________.
Question 10: Squids and cuttlefish can move short distances in any direction by rippling of a flap of ________ around the mantle.