Phylum Annelida

Phylum Annelida Characteristics Protostomia, eucoelomates _________________ (= unspecialized segmentation) In the Classes: Parapodia Clitellium

Systems _____________- epidermis is one cell layer with mucous gland that secrete a moist cuticle. _______________ -hydrostatic (using coelom) Muscle- ____________ and _____________ muscles Each segments muscles are independent of the other segments. Digestive- complete, complex, with __________ for absorption and ___________________acting as digestive gland and excretory cells.

Systems (continue) Excretory- a pair of _____________ per segment. Respiratory -through skin, some through parapodia; tubeworms have gills. Circulatory- __________ system, use _____________ as oxygen carrier. Nervous- dorsal brain; ventral, double, solid nerve cord, with _____________ in each segment. Endocrine- hormones secreted by nervous system. Reproductive- ______________ in Polychaeta; no special organs, posterior end becomes gonads. __________________ in Oligochaeta and Hirudinea; Clitellium.

Annelida Taxonomy Phylum Annelida (an-nel-i-da) Earthworm dissection Click on any term that is underlined to go to that slide Phylum Annelida (an-nel-i-da) Class Polychaeta (poly-key-ta) Nereis, Aphrodita, Chaetopterus, Arenicola, Amphitrite Class Oligochaeta (ol-e-go-key-ta) Lumbricus, Tubifex Class Hirudinea (hi-ru-din-e-a) Hirudo, leech Earthworm dissection

Return to taxonomy Nereis (clam worm) Nereis Nereis

Return to taxonomy Aphrodite (sea mouse) dorsal ventral

Other Polychaetes Return to taxonomy Amphitrite (plum worm) Chaetopterus Arenicola (Lug worm)

Hirudo (leech) Return to taxonomy

Lumbricus Return to taxonomy dorsal ventral __________ Lumbricus

Earthworm Dissection Return to taxonomy Cross section

Earthworm cross section Return to taxonomy Earthworm cross section

Interesting Facts On each segment, except the first and last, are four pairs of tiny bristles called ______ that help the worm move through the earth. A worm's body wall has two kinds of muscles that it uses to crawl. Circular muscles surround the worm's body and can make the body shrink or spread out. ____________ muscles run the length of the body and can shorten or lengthen the worm. Setae (bristles) prevent the worm from slipping.

Interesting Facts Continued The earthworm has no lungs or gills. It breathes through its thin skin, which is in contact with the air between the particles of soil. When it rains, these air spaces fill with water, and earthworms then must either come to the surface or _________.

Interesting Facts Continued Scientific Classification. Earthworms are in the family ________________ of the segmented worm phylum, ___________. The scientific name for one common species is ________________________.