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5 Cards in this Set

  • Front
  • Back

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