Lab 3: Phyla Annelida & Mollusca

Protostomia

mouth first

Deuterostomia

anus first

Clade Lopthotrochozoa share what structures

trochophore larva and lophophore feeding

What are the body cavity types

Acoelomate, pseudocoelomate, eucoelomate

Acoelomate

no coelom

Pseudocoelomate

partial coelom

Eucoelomate

fully developed coelom

Metamerism

division of body into repeated segments

Tagmatization

reduction in number of segments due to specialization

Head of Phylum Annelida

prostomium then peristomium

Last segment of Phylum Annelida

pygidium

Chaetae/setae

chitinous bristles

Parapodia

gills or locomotion

Muscular control in Phylum Annelida

circular and longitudinal

What are the classes of Phylum Annelida?

Class Polychaeta

What are the classes of Clade Clitellata?

Oligochaeta
Hirudinea

Cephalization

Polychaeta
important neurological and sensory organs towards front of body

Atoke

Polychaeta
immature form

Epitoke

Polychaeta
mature form

Clitellum

Clitellata
specialized structure used for reproduction

Three regions of Phylum Mollusca

head/foot
mantle
visceral mass

Radula

Mollusca
feeding

Shell

Mollusca
protection

Ctenidia (gills)

Mollusca

What are the classes of Phylum Mollusca?

Scaphopoda
Polyplacophora
Gastropoda
Bivalvia
Cephalopoda

Planospiral

flattened shells

Conospiral

conal shells

Dextral

coiling to right

Sinistral

coiling to left

Class Cephalopoda have what exception?

closed circulatory system

Siphuncle

Nautiloidea
living cord of tissue that helps with buoyancy control

Class Oligochaeta include

earthworms

Class Hirudinea include

leeches