PHYLUM ECHINODERMATA

To prepare: Read Exercise 16 in the lab manual. Familiarize yourself with the classification.

In lab: Examine the display specimens and look for distinguishing characteristics. You will dissect a sea star and a sea cucumber. Be able to identify many of the structures on pages 250 & 261. You should be able to identify many of the structures identified in the your lab manual.

Demo Specimens

Class Echinoidea

Lytechinus variegatus - Variegated urchin

Arbacia punctulata - Atlantic purple sea urchin

Mellita quinquiesperforata - Keyhole urchin

Echinarachnius parma - Common sand dollar

Class Holothuroidea

Thyone - Sea cucumber

Class Ophiuroidea

Ophioderma - Brittle star

Class Asteroidea

Asterias - Atlantic sea star

Luidia clathrata - Gray sea star

PHYLUM HEMICHORDATA

Demo Specimens

Dolichoglossus - Common acorn worm

Balanoglossus - Golden acorn worm

PHYLUM CHORDATA (part)

To prepare: Read Exercise 17 in the lab manual. Familiarize yourself with the classification.

In lab: Examine the display specimens, review the figure (slide in slide box) on page 271 and look for distinguishing characteristics.

Demo Specimens

Subphylum Urochordata - Tunicates

Aplidium - Common sea pork

Molgula - Common sea grape

Subphylum Cephalochordata - Sea lancelets

Branchiostoma - Sea lancelet/Amphioxus