Molluscs

Question 1

Radula

Answer 1

Tonge like organ used for rasping of food material

Question 2

Odontophore

Answer 2

Supporting cartilage for radula

Question 3

Where is the radula found?

Answer 3

Cephalopodae, caudofoveata, monoplacophora, polyplacophora, scaphopoda

Question 4

Periostracum

Answer 4

Outer layer of shell in molluscs. Compose of the protein conchiolin

Question 5

Cochiolin

Answer 5

A protein that makes up periostracum

Question 6

Prismatic Layer

Answer 6

Densely packed prisms of calcium carbonate laid down in a protein matrix

Question 7

Inner Nacreous Layer

Answer 7

Thin sheets of calcium carbonate, nacre continuously laid down on protein matrix

Question 8

Metanephridia

Answer 8

Molluscs kidney

Question 9

Trochophore

Answer 9

Free swimming larva hatched from mollusc egg

Question 10

Veliger

Answer 10

Intermediate larval stage. Possess a foot, mantle and shell.

Question 11

Caudofoveata

Answer 11

Class of molluscs, wormlike, no shell, calcareous scales

Question 12

Solengastres

Answer 12

Class of mollusc, wormlike, no gills, calcareous spicules/scales.

Question 13

Monoplacophora

Answer 13

Molluscs. Thought extincts. Small round. Creeping foot. Serially repeated organs

Question 14

Polyplacophora

Answer 14

Molluscs, chiton, flattened body convex dorsal, 8-7 articulating calcareous plates

Question 15

Scaphopoda

Answer 15

Tubular shells, foot protrudes from bottom, no gills

Question 16

Gastropoda

Answer 16

Most diverse molluscs, shell is the chief defense

Question 17

Univalve

Answer 17

One -piece, coiled or uncoiled

Question 18

Operculum

Answer 18

Covering the shell of the aperture

Question 19

Aperture

Answer 19

Opening in mollusc shell

Question 20

Ortogenetic torsion

Answer 20

Developmental change in the position of body parts

Question 21

Planospiral shell

Answer 21

Primitive ancestral state, had all whorls in a single plane

Question 22

Pneumostone

Answer 22

Small opening in lungs to outside if air-breathing snails

Question 23

Prosobranchia

Answer 23

Largest subclass, marine snails and some fresh water gastropods

Question 24

Ophistobrachia

Answer 24

Marine, reduced shell,

Question 25

Aplysia

Answer 25

Sea hares, rhinopores and vestigial shell

Question 26

Rhinopores

Answer 26

Ear like tentacles with chemosensors

Question 27

Nudibranchs

Answer 27

No shell, as adults no gills, cerata

Question 28

Cerata

Answer 28

Projections of body surface, ruffles of the mantle for Gaseous exchange

Question 29

Pulmonata

Answer 29

All land snails, freshwater snails and slugs, no gills,

Question 30

Bivalvia

Answer 30

Oysters, shipworms, mussels. The have two shells

Question 31

Umbo

Answer 31

Oldest part of the shell, growth outward in rings

Question 32

Crystalline style

Answer 32

Rotating gelatinous rod in stomach, keeps food particles whirling

Question 33

Veliger

Answer 33

Develop from trocophore

Question 34

Glochidia stage

Answer 34

Larvae develops into a specialized veliger form

Question 35

Orthocone

Answer 35

Cephalopoda ancestor with straight shell

Question 36

Ammonoids

Answer 36

Extinct with chambered shells

Question 37

Nautilus spp

Answer 37

Remaining survivors of Nautiloids

Question 38

Siphuncle

Answer 38

Cord of living tissue in nautiloids that extend from the shell to the visceral mass

Question 39

Sepiidae

Answer 39

Cephalopoda order, cuttlefish

Question 40

Teuthida

Answer 40

Cephalopoda Order, squid

Question 41

Octopoda

Answer 41

Cephalopoda order, octopuses

Question 42

The shell of a cuttlefish

Answer 42

Cuttlebone, enclosed by mantle

Question 43

The thin strip shell of a squid

Answer 43

The pen, enclosed by mantle, most have disappeared

Question 44

Chromatophores

Answer 44

Pigment filled cells in the skin that expand and contract

Question 45

Siphon

Answer 45

Ventral funnel which some cephalopods use to swim by expelling water through it