BIO 102 Flashcards

Flashcards on Arthropoda, Platyhelminthes, and Echinodermata

Arthropod

Organisms with jointed legs or appendages; the largest phylum in the animal kingdom.

Body parts of Arthropoda

Head, Thorax, and Abdomen

Chitin

Exoskeleton made of __.

Excretion in Arthropods:

Malpighian tubules or green gland.

Sub-Phylum Trilobitomorpha

Trilobites, dominant arthropods in the early Paleozoic seas; now extinct.

Sub-Phylum Chelicerata

Mostly terrestrial arthropods; body divided into prosoma and opisthosoma; possess chelicerae.

Arachnida

Scorpions, Spiders, Ticks, Mites etc

Cephalocarida

Horseshoe shrimps

Sub-Phylum Myriapoda

Chiefly terrestrial arthropods with elongated bodies and numerous segments; examples include centipedes and millipedes.

Sub-Phylum Hexapoda

Mostly terrestrial arthropods with a body divided into head, thorax, and abdomen; possess three pairs of jointed appendages. Mouthparts are entagnathous , meaning that they are retracted within the head unlike the insects.

Orthoptera

Locusts, Grasshoppers and Crickets

Lepidoptera

Moths, Butterflies

Hymenoptera

Bees, Wasps and Ants

Diptera

Flies, Mosquitoes

Siphonaptera

Fleas

Phylum Platyhelminthes (Flatworms)

They are triploblastic, bilaterally symmetrical, dorsoventrally flattened, acoelomate flatworms.

Excretion in Platyhelminthes:

Protonephridia with flame cells.

Class Turbellaria

Planarians

Class Trematoda

Flukes

Class Cestoda

Tapeworms

Metacercaria

A juvenile fluke, when eaten by definitive host develop into adult fluke.

Clonorchis sinensis

Chinese Liver Fluke

Tapeworm classification

Body divided into many segments (proglottids.

Scolex

Hooks and suckers.

Echinodermata

Animals having uneven or spiny skin are called __.

Echinoderm

Marine invertebrate characterized by radial symmetry, a water vascular system, and an endoskeleton.

Respiratory organs include

dermal branchiae, tube feet, respiratory tree and bursae.

Class Asteroidea

Star-like appearance with five arms; tube feet with suckers.

Neometra

Sea lily

Holothuria

Sea cucumber

Class Holothuroidea

Body is long and cylindrical.

Class Echinoidea

Body hemispherical; compact body enclosed within a test (or shell) of closely fitting ossicles or plates and movable spines.

Echinus

Heart urchins

Class Ophiuroidea

Flat body with pentamerous discs; long arms demarcated from the central disc; tube feet devoid of suckers.

Class Ophiuroidea Characteristic

leathery skin

Class Crinoidea

Star-shaped body; arms are bifurcated; tube feet have no suckers.