Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

53 Cards in this Set

  • Front
  • Back
adaptive radiation
the evolution of an ancestral species into several new species within a relatively short period of time and in a certain geographic area
phlyum mollusca
100,000 living species, 35,000 extinct species...evolved 600mya
Class Polyplacophora
Class Pelecypoda
clams, oysters, mussels, scallops
Class Gastropoda
snails, slugs, limpets, whelks
Class Cephalopoda
squid, nautilus, octopus
made of calcium carbonate, provides protection from predators
has the "brain," the sense organs in the form of eyes or tentacles and a radula(a tongue like rasping organ with teeth)
a lining of the body wall. Covers the body organs and produces the calcium carbonate of the shell
Visceral Mass
digestive, excretory, circulatory, reproductive organs. (refer to p. I3)
muscular, for locomotion (important for classification of mollusks into different classes)
located in pallial groove, which is between the mantle and foot. Have a large surface area for the diffusion of gases
a rasping tongue inside of the mouth used to scrape algae off rocks
short tube connecting mouth to stomach
chamber where digestion continues as more enzymes are added and food is mixed
digestive gland
"liver"...large gland which adds digestive enzymes to food passing into the intestine. Found ventral to the gonad and has a smooth, green texture
looping tube extending from the stomach (refer to p. I8)
(a testis or ovary)...releases its gametes (egg or sperm) out of tubes which empty out gonopores into the pallial groove and are swept away
consisting of two shells
dome shaped elevation on each valve, oldest part of shell. This points towards the anterior side of the organism
secrete enzymes and absorbs food products
Incurrent Siphon
short tube along ventral surface leading inside mantle between the 2 valves; water enters this way
Excurrent Siphon
short tube along the dorsal surface leading outside from the mantle between the 2 valves; water leaves this way
Heart (Clam)
A distinct structure with three chambers - two auricles and a ventricle. (refer to p. I14)
A muscular throat leading from the mouth containing a dorsal horny "jaw" and a ventral tongue-like radula
a large thin-walled storage chamber for food
single gonad produces both eggs and sperm in different parts of the organs. Lies in the apex of the shell
On the female side, this tube carries eggs to the vagina
Penis (snail)
lies next to the vagina
Dart Sac
Unique to snails, a chamber adjoining the vagina. (refer to p. I19)
(funnel lies near the head and is an extensio of the mantle cavity. (refer to p. I22)
A translucent, flexible, thin blade of supporting tissue which runs along the back of the squid just under the mantle (refer to p.I22)
ink sac
Black colored sac, filled with fluid, lies above the rectum with an opening near the anus.
a large digestive side chamber; a long thin walled sac extending posterior from the stomach and caecum.
kidney (squid)
(=nephridium) one obvious excretory organ drains fluids from the pericardial chamber surrounding the heart and forms urine. The latter is eliminated via tubes in the mantle cavity
gill hearts
two accessory hearts (single chambers) just before the two gills which give blood an extra boost as they pass through the capillaries of these respiratory organs
arms (squid)
the squid foot is a circle of eight arms
the squid foot is a circle of 2 tentacles with suckers
heavy mantle tissue that surrounds the 8 plates and in some cases covers them
sense organs
there are no distinct eyes nor tentacles in chitons. the mantle is sensitive to touch, chemicals, and light
Adductor muscles
broad and powerful muscles located near the hinge. control opening and closing of the shells
labial palps
soft fleshy flaps that bring food into the mouth
albumen gland
on the female side, this gland provides nourishment for the eggs
vas deferens
on the male side this tube lies parallel to the oviduct. sperm passes through this tube on the way out the penis
the dark spots, found on the mantle, are pigment cells that allow squid to change their color instantly
eye (squid)
Capable of adjusting focus and the pupil can be dilated or contracted to respond with changes in light
collection of fused ganglia
dorsal side; unites the right and left valves
growth rings
outside of the shell, similar to the rings seen in a cross-section of a tree trunk. Each ring represents a period of rapid growth followed by a period of rest
tentacles (snail)
there are two pairs, act as touch, taste, and olfactory (smell) detectors
chamber formed by the mantle cavity for oxygen and carbon dioxide exchange. (refer to p. I18)
jet propulsion
method of locomotion; refer to p. I20
all mollusks, (boneless)