40 terms

Mollusca, Echindermata, and Arthropoda

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trochophore larvae
A cilliated free swimming larvae of mollusks
foot
A muscular organ used for movement in mollusks
mantle
It is a protective tissue layer of epidermis in mollusks that secretes a substance forming the shell and can keep the internal structures in place
radula
A rasping tongue used by mollusks to tear pieces of algae or flesh for eating
visceral mass
The area beneath the mantle of a mollusk that contains the internal organs
dioecious
An animal that has separate sexes - male only and female only. ex) humans
byssus
A tough protein thread secreted by a gland in the foot of some bivalves like mussels that is used to attach the bivalve to a solid surface
gills
Organs that exchange oxygen and carbon dioxide with water and in bivalves are also used for filter feeding
adductor muscles
There is an anterior and a posterior adductor muscle which are used to open and close the shell.
incurrent siphon
Brings food and water into the bivalve for filter feeding
excurrent siphon
Releases any excess water and food too large to be trapped by the gills of the bivalve
shell
A hard protective covering made of calcium carbonate that is used for protection or as an internal skeleton in mollusks
ink sac
An organ in a cephalopod that produces ink that can be ejected from the body to confuse and distract predators - it is dark and tastes bad allowing the cephalopod to escape
suckers
Structures on the underside of the arms of octopi & squid used for grabbing and pulling
tentacles
Arm-like structures. In the Nautilus they have no suckers and in the squid they have sucker only at the ends
tube feet
In echinoderms, tubes that end in a suction cup on the underside of the animal; part of the water vascular system, which aid in locomotion, gas exchange, taste, and excretion
ampulla
In echinoderms, the round, muscular structure on a tube foot that aids in locomotion by controlling the amount of water in the tube foot
madreporite (sieve plate)
Structure of a sea star that filters out large objects from the water entering the water vascular system; it also regulates the amount of sea water in the system. Located on the central disk.
radial canal
A structure in echinoderms that runs the length of the arm; it is part of the water vascular system that takes the water to the tube feet
ring canal
In echinoderms, a circular canal that is surrounding the mouth and it is part of the water-vascular system
pentamerous radial symmetry
Body parts are arranged in multiples of 5 around a central axis as is seen in Echinoderms
water vascular system
In echinoderms, a network of water-filled canals that function in movement, food gathering, and as a basic circulatory system. It also serves as an endoskeleton
endoskeleton
An internal skeleton
exoskeleton
An external skeleton; tough external covering that protects and supports the body of many invertebrates such as Arthropods
Malpighian tubules
In arthropods, tubules located in the abdomen that are responsible for the removal of nitrogenous wastes from the blood
photoreceptors
They are light sensitive nerve cells that convert light to electrochemical impulses
antenna
An appendage on the head of an arthropod that contains sense organs
spiracles
Openings on the abdomen and thorax through which air enters and waste gases leave the insect's body
sinuses
In Arthropods, open spaces where tissues are bathed in blood
book lungs / gills
Organ in Arthropods that are used for respiration - they are layered like the pages of a book
metamorphosis
A dramatic change in appearance or characteristic
tracheal system
In insects, a system of branched, air-filled tubes that extends throughout the body and carries oxygen directly to cells.
compound eye
In arthropods, a eye made up of multiple lenses; has many photoreceptors
cephalothorax
A body region found in Arthropods composed of the head and thorax fused together
swimmerets
Small paired appendages located on the ventral surface of the abdomen of crustaceans used for swimming or reproduction
chelicerae
First pair of appendages in Arachnids that inject venom and digestive juices into prey.
pedipalps
The second pair of appendages in Arachnids(chelicerates), modified for sensory functions and manipulating prey
complete metamorphosis
The complete rearrangement of the body plan as some insects develop from a fertilized egg to an adult. There are 4 stages: egg, larva, pupa, adult (ELPA). The baby and adult forms look very different ex) caterpillar to a butterfly
incomplete metamorphosis
A type of development in certain insects, such as grasshoppers, in which the young (called nymphs) resemble adults but are smaller and have different body proportions. The nymph goes through a series of molts, each time looking more like an adult, until it reaches full size. There are 3 stages: egg, nymph, adult (ENA)
molt
The process where the exoskeleton of arthropods is shed and then replaced over time so that the animal can have room to grow.