Biology 3229F/G Lecture Notes - Lecture 10: Gill, Aplacophora, Monoplacophora
10 Dec 2016
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Document Summary
7 classes of molluscs: aplacophora, bivalvia, gastropoda, monoplacophora, Deletron: 20 pairs of hooks along each arm 500 in total, hard, cat-like, and retract. Taxonomy form natural groupings, decide what those are, and put names on them (cid:498)phora(cid:499)= bearing (cid:498)placo(cid:499)= plate. Cephalopods are predominately pelagic octopuses are on the bottom but can eject away when they need defense. Cephalopods are an ancient group of mollsucs, very successful, super abundant. Evolved in middle cambrian (510 mya) and soon after that they went through pulses of diversification (480-440 mya), became very abundant and dominated until the end of dinosaur distinction (65 mya) Characteristics: characteristics and theoretically everything evolved from it. There has been quite a change in the body form expelled, also expel waste products. Shallow water squid also use funnel to expel water in strong powerful bursts to give repulsion good way of getting away from predators.
