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5 Cards in this Set

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Chordates; Subphylum Urochordata; Tunicate

~ Common Name: Sea Squirts


~ Grow in colonies


~ Marine


~ Eat Plankton


~ Notochord: Larvae (yes), adult (no)


~ Dorsal Nerve Cord: Larvae (yes), adult (no)


~ Respiration is achieved through a pharyngeal basket pierced by gill slits


~ Filter Feeders


~ Head: No


~ Open Circulation


~ No segmentation


~ No muscle arrangement


~ No jaws


~ No appendages


~ Adults are sessile

Chordates; Subphylum Cephalochordata; Lancelet

~ Common name: Lancelet


~ Small jawless, fishlike


~ Notochord


~ Dorsal nerve cord


~ Respiration is achieved by pharyngeal region with many gill slits(~100)


~ H2O passes through pharynx and traps food in mucus


~Have a head


~ Closed circulation


~ Have segmentation; muscles and nerves


​~ muscles are V shaped and paired on either side of the body; branch from nerves


~ No jaws


~ No Appendages


~ Movement is achieved by bending bodies back and forth

Tunicate Diagram

Lancelet Diagram

Traits shared by all chordates

1. Dorsal hollow nerve tube


2. Notochord > backbone of higher organization


3. Gil slits (pouches)


4. Post anal tail