Biology VocabularyBiology Vocabulary

Word Group 8Word Group 8

INVERTEBRATEINVERTEBRATEAn animal that does not have An animal that does not have

a backbonea backbone

CNIDARIANCNIDARIANAn invertebrate animal that An invertebrate animal that includes jellyfish, coral, and includes jellyfish, coral, and

hydrashydras

RADIAL SYMMETRYRADIAL SYMMETRYAn arrangement of body parts An arrangement of body parts

that resembles the that resembles the arrangement of spokes on a arrangement of spokes on a

wheelwheel

TENTACLETENTACLEAn arm-like body part in An arm-like body part in

invertebrates that is used for invertebrates that is used for capturing preycapturing prey

FLATWORMFLATWORMA simple worm that is flat and A simple worm that is flat and

thinthin

BILATERAL BILATERAL SYMMETRYSYMMETRY

A body plan that consists of A body plan that consists of left and right halves that are left and right halves that are

the samethe same

ROUNDWORMROUNDWORMA worm with a smooth, round A worm with a smooth, round

body and pointed endsbody and pointed ends

SEGMENTED WORMSEGMENTED WORMA worm whose body is divided A worm whose body is divided

into sections such as into sections such as earthworms or leechesearthworms or leeches

MOLLUSKMOLLUSKAn invertebrate divided into An invertebrate divided into three parts: head, body, footthree parts: head, body, foot

ARTHROPODARTHROPODThe largest group of The largest group of

invertebrates which include invertebrates which include insectsinsects

MOLTINGMOLTINGThe process by which an The process by which an

arthropod sheds its external arthropod sheds its external skeletonskeleton

CRUSTACEANCRUSTACEANA class of arthropods that A class of arthropods that includes crabs, lobsters, includes crabs, lobsters,

crayfish, and sow bugs; they crayfish, and sow bugs; they have five pairs of legshave five pairs of legs

ARACHNIDARACHNIDA class of arthropods that A class of arthropods that includes spider, scorpions, includes spider, scorpions,

mites, and ticksmites, and ticks

COMPLETE COMPLETE METAMORPHOSISMETAMORPHOSIS

Changes in form during Changes in form during development in which earlier development in which earlier

stages do not look like the stages do not look like the adultadult

INCOMPLETE INCOMPLETE METAMORPHOSISMETAMORPHOSIS

Changes in form during Changes in form during development in which earlier development in which earlier

stages look like the adultstages look like the adult

PUPAPUPAA stage in the development of A stage in the development of some insects that leads to the some insects that leads to the

adult stageadult stage

ECHINODERMSECHINODERMSInvertebrates which live in the Invertebrates which live in the

ocean and include sea stars, sea ocean and include sea stars, sea urchins, sand dollars, and sea urchins, sand dollars, and sea

cucumberscucumbers

TUBE FOOTTUBE FOOTA small structure used by A small structure used by

echinoderms for movementechinoderms for movement