ZOO 2700 Lecture Notes - Lecture 12: Hydrostatic Skeleton, Sipuncula, Hemoglobin
28 Mar 2018
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Document Summary
Funiculus: ligament, tendon, that connects the stomach to the bottom of the body wall. Contraction of parietal muscles increases coelomic pressure and everts lophophore. Physiologically and physically integrated zooids: integrated coelom. Form depends on pattern of asexual budding. Polymorphism: in some groups- eurystomes, autozooids- feeding zooids, heterozooids- non-feeding zooids, avicularia: jaw-like mechanism used for defense, vibracula: large cilia-like structure use to keep colony clean, sometimes for locomotion. Corona: ciliary band for swimming and locomotion. Planktotrophic: functioning gut and actively feed before settling. Each colony arises by asexual budding from the first settling zooid or ancestrula. Formed by the metamorphosis of a sexually produces larva, or from a resting bud (statoblast) Bivalve mollusc: the plane of symmetry in bivalves runs right along the hinge line, valves are lateral (left and right) Brachiopod: the plane of symmetry runs perpendicular to the hinge, valves are dorsal and ventral. Apomorphies: bivalve shell and mantle, brachia: calcareous lophophore support, heart is dorsal, digestive ceca.
