phylum chart 2 nematoda phylum annelida phylum mollusca circulatory distribution through coelomic...

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Page 1: Phylum Chart 2 Nematoda Phylum Annelida Phylum Mollusca Circulatory distribution through coelomic fluid closed system with 5 pairs of aortic arches

Phylum Nematoda Phylum Annelida Phylum Mollusca Defining Traits -roundworms

-complete digestive system

-metamerism (segmented) -setae -well-developed organ-systems

-soft bodies -one or more shells -3 parts: head, foot, visceral mass -mantle -radula-rasping tongue

Symmetry bilateral bilateral bilateral Coelom pseudocoelomate coelomate coelomate Level of Organization

organ-system organ-system organ-system

Nervous -ganglia -nerve cords -sense organs

-ganglia -ventral nerve cord with segmental ganglia -sense organs

-ganglia -nerve cord -sense organs

Skeletal hydrostatic skeleton

hydrostatic skeleton -hydrostatic skeleton -shell

Muscular longitudinal layer of muscles

circular layer and longitudinal layer

-mantle -muscle contractions in foot

Digestive complete: mouth intestine anus

complete: mouth pharynx esophagus crop gizzard intestine anus

complete: mouth esophagus stomach intestines anus digestive gland

Respiratory diffusion

diffusion through cuticle gills

gills or lungs

Page 2: Phylum Chart 2 Nematoda Phylum Annelida Phylum Mollusca Circulatory distribution through coelomic fluid closed system with 5 pairs of aortic arches

Phylum Nematoda Phylum Annelida Phylum Mollusca Circulatory distribution through

coelomic fluid

closed system with 5 pairs of aortic arches

open system with heart, blood vessels, and sinuses

Excretory excretory tubules and pores

nephridia nephridia or simple kidney

Reproduction -sexual reproduction -distinct sexes -external or internal fertilization

-hermaphrodites with sexual reproduction -external fertilization

-sexual reproduction -distinct sexes or hermaphrodites -external fertilization

Classes

1.Oligochaeta-earthworms 2.Polychaeta-tube worms, marine worms 3.Hirudinea-leeches

1.Gastropoda-snails, slugs, nudibranchs 2.Bivalvia-clams, oysters 3.Cephalopoda-octopus, squid, nautilus, cuttlefish

Miscellaneous -non-living cuticle for outer covering -most are free-living, some are parasites -important decomposers

-burrowing may have saved the planet from global ice age

-siphons: incurrent and excurrent