Chapter 34

Front 1

Platyhelminthes

Back 1

Flat Worm

plat·y·hel·minth

Front 2

Turbellaria

Back 2

Belonging to the Turbellaria, a class of

platyhelminths or flatworms,mostly aquatic and having cilia on the body surface.

Front 3

Cestoda

Back 3

A parasitic flatworm

Ces`tod´a

Front 4

Termatoda

Back 4

Any parasitic flatworm of the class Trematoda, especially a fluke, having hookers or suckers.

Trem·a·to·da

Front 5

Definitive host

Back 5

An organism that supports the adult or sexually reproductive form of a parasite.

Front 6

Intermediate host

Back 6

An organism that supports the immature or nonreproductive forms of a parasite.

Front 7

Annelida

Back 7

Segmented worms

an·ne·lid

Front 8

Polychaeta

Back 8

Are a polyphyletic class of annelid worms, generally marine.

Pol`y`chae´ta

Front 9

Clitellata

Back 9

Aclass of annelid worms, characterized by having a clitellum - the 'collar' that forms a reproductive cocoon during part of their life cycles

klahy-tel-uh m

Front 10

Chaeta

Back 10

A stiff bristle made of chitin, especially in an annelid worm.

kee-tuh

Front 11

Parapodium

Back 11

In a polychaete worm, each of a number of paired muscular bristle-bearing appendages used in locomotion, sensation, or respiration.

par-uh-poh-dee-uh m

Front 12

Oligochaetes

Back 12

An annelid worm of the class Oligochaeta, such as an earthworm.

ol-i-goh-keet

Front 13

Hirudinea

Back 13

Leeches are segmented worms that belong to the phylum Annelida.

hir-oo-din-ee-uh

Front 14

Sipunculida

Back 14

An invertebrate of the phylum Sipuncula,

comprising the peanut worms.

sahy-puhng-kyuh-lid

Front 15

Echiurid

Back 15

Spoon worms, a small group of marine animals. Once treated as a separate phylum, they are now universally considered to represent derived annelid worms.

ek-ee-yoo r-id

Front 16

Mollusca

Back 16

Group of organisms that typically have their bodies laid out in three parts: foot, visceral mass, and mantle. Have very reduced coeloms.

muh-luhs-kuh

Front 17

Bibalvia

Back 17

A class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts.

Front 18

Veliger

Back 18

The final larval stage of certain mollusks, having two ciliated flaps for swimming and feeding.

Front 19

Gastropoda

Back 19

Commonly known as snails and slugs, are a large taxonomic class within the phylum Mollusca.

Front 20

Radula

Back 20

A rasplike structure of tiny teeth used for scraping food particles off a surface and drawing them into the mouth.

raj-oo-luh

Front 21

Polyplacophora

Back 21

An order of Amphineura comprising the chitons all of which have the foot occupying the whole ventral surface of the body and the shell composed of eight calcified dorsal plates.

Poly·pla·coph·o·ra

Front 22

Cephalopoda

Back 22

Any member of the molluscan class Cephalopoda. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles modified from the primitive molluscan foot.

Front 23

Spermatophore

Back 23

A protein capsule containing a mass of spermatozoa, transferred during mating in various insects, arthropods, cephalopod mollusks, etc.

Front 24

Ecdysozoa

Back 24

Monophyletic group that is distinguished by its method of growth: molting (shedding of the exoskeleton or cuticle)

Front 25

Onychophora

Back 25

velvet worms

on·y·choph·o·ran

Front 26

Tardigrada

Back 26

Also called bear animalcule, water bear. any microscopic, chieflyherbivorous invertebrate of the phylum Tardigrada, living in water, onmosses, lichens, etc.

tahr-di-greyd

Front 27

Detritivore

Back 27

An animal that feeds on dead organic material, especially plant detritus.

Front 28

Compound eyes

Back 28

An eye consisting of an array of numerous small visual units, as found in insects and crustaceans.

Front 29

Antennae

Back 29

Either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods.

Front 30

Nematoda

Back 30

roundworms

Front 31

Arthropoda

Back 31

An arthropod is an invertebrate animal having an exoskeleton, a segmented body, and jointed appendages. Arthropods form the phylum Arthropoda, and include the insects, arachnids, myriapods, and crustaceans.

Front 32

Myriapoda

Back 32

An arthropod of a group that includes the centipedes, millipedes, and related animals. Myriapods have elongated bodies with numerous leg-bearing segments.

Front 33

Insecta

Back 33

Insects are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body, three pairs of jointed legs, compound eyes and one pair of antennae.

Front 34

Chelicerata

Back 34

The subphylum Chelicerata, constitutes one of the major subdivisions of the phylum Arthropoda, and includes horseshoe crabs, and arachnids.

kuh-lis-er-ata

Front 35

Crustacea

Back 35

Crustaceans form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles.

Front 36

Carapace

Back 36

The hard upper shell of a turtle, crustacean, or arachnid

Front 37

Mandible

Back 37

The jaw or a jawbone, especially the lower jawbone in mammals and fishes.

Front 38

Nauplius

Back 38

a crustacean larva in usually the first stage after leaving the egg and with three pairs of appendages, a median eye, and little or no segmentation

naw-plee-uh s

Front 39

Holometabolous

Back 39

Undergoing complete metamorphosis.

hol-oh-mi-tab-uh-luh s

Front 40

Hemimetabolous

Back 40

Undergoing incomplete metamorphosis.

hem-ee-mi-tab-uh-luh s