Phylum Mollusca -BIO 201
Terms in this set (60)
are mollusks acoelomate or coelomate?
bivalves and gastropods
which mollusks live in brackish water?
which mollusks live on land?
which phylum has a similar embryonic development to Mollusca?
head-foot and visceral mass
what are the 2 parts of the mollusk body plan
which mollusk body portion contains:
which mollusk body portion contains: the feeding, cephalic sensory, and locomotor organs
2 folds of skin , protects the the mantle cavity
space between the mantle and body wall
gills of Mollusca
rasping tonguelike organ used for feeding
supporting cartilages of the radula
how does the radula function
rasps particles of food material, acts like a conveyor belt to the digestive system.
new rows of teeth develop as old are worn away
which Class of Phylum Mollusca doesn't have a radula?
what does pelagic mean?
the outer organic layer of the mollusk shell is called:
middle shell layer composed of prisms of calcium carbonate
shell layer that develops next to the mantle in thin layers
are mollusks monoecious or dioecious?
pairs of ganglia with connecting nerve cords
what does the nervous system of mollusks consists of?
in pulmonates, the lung opening to the outside of the animal
respiration of gastropods
mantle floor contracts, filling the mantle cavity with air
chemosensory area in gastropods located at the base of the siphon
what is the asexual reproduction of Phylum Mollusca called?
gastropods: monoecious or dioecious
gastropods: monoecious or dioecious
mussels, clams, scallops, oysters, and shipworms are in which class
animals that depend on water currents produced by cilia on their gills to gather food are called
are characteristics of which Class?
the oldest part of a bivalves shell; found at the apex
at which end of the animal is the foot found
do marine bivalves have internal or external fertilization?
what is the specialized parasitic veliger of a freshwater bivalve called?
freshwater bivalvia- internal or external fertilization?
squids, octopuses, nautiluses, devilfish, and cuttlefish are examples of which class?
a multipurpose organ, expels water from the body for swimming
Does Class Cephalopoda have an open or closed circulatory system
an organ located at the base of the gill that increases blood pressure in Cephalopods
what controls the orientation of the eyes in mollusks?
cells in the skin of cephalopods that contain pigment granules
secretes sepia- which used to be used as an artist's pigment
the "intermittent organ" of cephalopods, used to place spermatophores in the mantle cavity of females
what type of symmetry does Phylum Mollusca have?
physical anatomy of mollusks:
-enclosed in a thin dorsal mantle
-head region developed except scaphopoda and bivalve
-ventral muscular foot for locomotion
digestive tract of mollusks:
-mouth with radula rasps food
- anus opening in mantle cavity
-digestive gland and salivary glands
circulatory system of mollusk:
-open, except cephalopods
-dorsal heart with auricles and ventricles
-aorta and other vessels
respiration of mollusks:
ctendidia ( gills) or a "lung" in the mantle cavity
4 classes of Mollusca:
excretory system of mollusks:
nephridia ( kidneys) connected to pericaridal cavity, coelom is reduced
nervous system of mollusks:
3 pairs of ganglia, cerebral above mouth, pedal in foot, visceral in body. statocysts and many sense organs
reproduction in mollusks:
sexes usually separate, external or internal fertilization, mostly oviparous. veliger larva
characteristics of which Class?-shell reduced or absent
- head well developed with eyes and radula; foot modified into a siphon
-ganglia centralized to form a brain
first larval stage of molluscs
second larval stage of mollusks
how many germ layers does Phylum Mollusca have?
what is the covering of the shell called in Class Gastropoda?
2 step process that changes the position of the shell, digestive tract, and anus in Gastropod development
genus of Gastropod that has a venomous radula
What is the purpose of the siphon in Cephalopods?