Chordate Classes & Echinoderms & Reproductive Strategies

Myxini

Hagfish

jawless

no vertebrae.

Petromyzontida

Lampreys

jawless ectoparasites.

Chondrichthyes

Sharks and rays

cartilaginous skeleton.

Amphibia

Frogs and salamanders

external fertilization

chytrid fungus impact.

Reptilia

Lizards, snakes, crocs

internal fertilization

leathery eggs.

Aves

Birds

feathers

flight adaptations

evolved from dinosaurs.

Mammalia

Hair

mammary glands

parental care

endothermy.

Echinoderm Larvae

Bilateral symmetry.

Adult Echinoderms

Pentaradial symmetry.

Tube Feet

Used for movement and feeding.

Sea Stars

Use tube feet to pry open bivalves.

Sea Urchins

Can destroy kelp forests when predators are absent.

Feather Stars

Sessile, filter

Oviparous

Eggs develop externally, nourished by yolk.

Viviparous

Embryos develop inside mother, nourished by mother.

Ovoviviparous

Eggs hatch inside mother nourished by yolk.