Bio practical 142 #2 =]

Class Polyplacophora

Chitons

Class Bivalvia

• Mercenaria

Anterior

adductor

muscle

Dorsal

Ventral

Posterior

adductor

muscle

Mantle

Foot

MantleCavity

Gills

Visceral mass

Mouth

Labialpalps

Heart

Incurrent siphon

Excurrentsiphon

Digestive gland

Gonad

Class Gastropoda

• nudibranchs

Subphylum:TrilobitaTrilobite

Subphylum: ChelicerataClass: Merostomata

Limulus

Book gills

mouth

chelate

chelicerae

Compound eye

telson

cephalothorax

abdomen

Class CephalopodaLoligo

Systemic

heart

intestines

gills

gills

Mantle cavity dorsal

pen

Siphon retractor muscle

Female Loligo

Nidamental glands

Ovary

Visceral mass

anterior

posteriorsiphon

Ink sac

radulajaws

esophagus

stomach

Buccal bulb

mouth

collar