BIO 14_Exam 3_Phylum Concepts C

Ascaris, the intestinal roundworm

• Secernentea
• Tubellaria
• Trematoda
• Polychaeta

Polychaetes; clamworms, plumed worms, scale worms and their relatives

• Polychaeta
• Oligochaeta
• Hirudinea

Earthworms; terrestrial, freshwater and marine annelids with fewer setae than the polychaetes and no parapodia.

• Polychaeta
• Oligochaeta
• Hirudinea

Leeches; dorsoventrally flattened external parasites, predators or scavengers, with suckers at one or both ends of the body.

• Polychaeta
• Oligochaeta
• Hirudinea

A chiton has an oval flattened body that is made up of a thick body with 8 overlapping plates or valves, bordered by a thick girdle formed from the mantle that may be covered with spines, scales, or hairs.

• Polyplacophora
• Bivalvia
• Cephalopoda
• Gastropoda

clams, scallops, oysters, mussels and related mollusks

• Polyplacophora
• Bivalvia
• Cephalopoda
• Gastropoda

Octopuses, squids, and nautilus; active, intelligent marine predators in which the foot has evolved into a series of tentacles

• Polyplacophora
• Bivalvia
• Cephalopoda
• Gastropoda

Snails; that have a single whorled shell. The broad, long and flat foot is ventrally located and is used chiefly for locomotion.

• Polyplacophora
• Bivalvia
• Cephalopoda
• Gastropoda

Centipedes; predators with a head region followed by 15 to 177 body segments,each with a pair of legs.

• Chilopoda
• Diplopoda
• Insecta
• Crustacea
• Arachnida

Millipedes; mostly herbivorous, animals with head region followed by 20 to 200 segments. The head (1st somite) bears the eyes, pair of antennae, and a pair of mandibles.

• Chilopoda
• Diplopoda
• Insecta
• Crustacea
• Arachnida