Mollusca Quiz
What animals does the phylum Mollusca include?
snails, slugs, oysters, clams, octopi, and squids
what is the body characteristics of mollusca?
soft-bodied, invertebrates
What part makes the shell, if present?
The mantle secretes a protective shell made of calcium carbonate.
what is the phylum size?
Second largest with anthropoda at first
What part is muscular? How is it modified in squids and octopi?
muscular part is the foot for movement, in squids and octopi it is replaced by tentacles
digestive system of phylum mollusca? coelomate?
one way trackt with mouth, fully lined ceolum
what is the name of the distinct head and sense organs?
cephalization
sexes of mollusca?
dioecious- sexes are seperate
free swimming larvae are called?
trochophore
what are some uses for mollusks?
food, pearls (oysters and clams), and buttons (shiny inner layer)
Name some pests
shipworms-burrow into and thru wood
terrestrial snails n slugs- damage garden plants
zebra mussels- in Great Lakes, reeks havoc on ecosystem
Name the 3 general parts/body plan of a mollusc
muscular foot
visceral mass- digestive, circulatory, respiratory, reproductive organs
mantle- gills and in some cases secretesa protective shell
What is a radula?
tongue-like feeding structure found in most mollusks except bivalves (clams, oyster, scallop) has tiny rows of teeth
What is the shell molluscs made from?
calcium carbonate (limestone)
The difference between an open and a closed circulatory system
open-heart pumps hemolymph into the body cavity (hemocoel), bathing the organs.
closed- blood vessels and capillaries are completely enclosed
class polyplacophore
8 overlapping plates
can roll up
chitons
live in rocky intertidal zones
use radula to scrape algae
water flows over gills to respire
class gastropoda
snails, slugs, sea hares, sea slugs, sea butterflies
largest class
70,000 species
marine, freshwater terrestrial
shell is 1 peice coiled or uncoiled
swirl is genetically controlled
shell closed by operculum
class bivalvia
clams, oysters, mussels, scallops, shipworms
2 shells
sessile filter feeders
no head or radula
growth occurs in concetric rings
laterally compressed shell, held together by hinge ligament
umbo is oldest part of shell
incurrent and excurrent siphons
class cephalopoda
squidwards, octopus, cuttlefish, nautilus
sexes are seperate
beak like jaw surrounded by tentacles
buoyant shells by gas chamber
cuttlefish- curved shell enclosed by mantle
squid- shell reduced to small strip called pen, enclosed in mantle
swim by expelling water from mantle through ventral funnel
complex eyes
largest invertebrate brain
closed circulation