Advanced Invertebrates

Digestion, Excretion, Respiration

• mollusks– many mollusks have a radula – scrapes

and cuts– bivalves are usually filter feeders– cephalopods are predators with beak-like

jaws– have mouth, esophagus, stomach,

intestine, rectum, anus

Feeding & Digestion

• annelids– digest organic

compound in soil– have mouth,

esophagus, crop, gizzard, intestine, anus

Feeding & Digestion

• arthropods – crustaceans– appendages

• maxilla: manipulates food• maxillipeds: manipulates food, tastes• mandibles: chew food• chelipeds: capture food

– mouth, esophagus, stomach, intestine, anus

– digestive gland

Feeding & Digestion

• arthropods – chelicerates– appendages

• chelicera (with poison gland)

• pedipalp: hold and chew

– mouth, stomach, intestine, anus

– digestive gland

Feeding & Digestion

• arthropods – uniramians– appendages

• labrum & labium “lips”• mandibles• maxilla

– mouth, esophagus, crop, gizzard, gastric ceca, midgut, hindgut, anus

– salivary glands

Feeding & Digestion

• echinoderms– mouth,

esophagus, cardiac stomach, pyloric stomach, anus

– digestive gland

Feeding & Digestion

Excretion

• mollusks – nephridia and kidneys• annelids – nephridia in each segment• arthropods

– crustaceans – green gland for excess water– chelicerates – Malpighian tubule & coxal

gland– uniramians – Malpighian tubules

• echinoderms – cellular diffusion

Respiration

• mollusks– aquatic w/ gills– terrestrial w/ lungs

• annelids – skin• arthropods

– crustaceans – gills & exoskeleton– chelicerates – book lung, spiracles & trachea– uniramians – spiracles & trachea

• echinoderms – skin gills