Question

Biological Drawings

Draw three specimens (but not a sponge or a chiton) including everything you need for a biological drawing (See Appendix 2 - Legend, ruled lines, scale, use pencil only and each drawing should be at least 10cm size). Make sure you include at least 5 labels for each drawing.

Biological drawing 1: sea star (Asteroidea)

Biological drawing 2: sea cucumber (holothuroidea)

Biological drawing 3: brittle star (ophiuroidea)

Answer 1

Starfish is marine and has 3 short arms originating fromt he central disc. Oral surface has mouth and aboral surface has madriporite and anus.

Sea cucumber is disc like. It have no arms. They have tentacles around the mouth. Disc shaped body not present they are cy,indrical . That is why the distance between mouth and an-us is more.

Brittle stars have 5 thin , long and flexible arms. The arms are also jointed.