BIOL 353 Lecture Notes - Lecture 13: Enopla, Anopla, Basal Lamina
23 Apr 2018
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Superficial cilia on epidermis for locomotion, aboral web and neuro sensory complex on top. The mouth leads to a stomodeum (modified pharynx). Lifecycle, only a few species reproduce through fragmentation, external fertilization, other species have a planula in its larval life cycle, cydippid =embryos developed directly into miniature ctenophores (resemble adult stage). Feeding behavior: tentacles studded with colloblast structures, they are sticky connected to two filaments. Rotates body to bring mouth closer to tentacles, prey on crustaceans and larval fish. Mouth has macrocilia which is used to eat larger preys. Non-segmented, bilateral symmetry, acoelamate, closed circulatory system, no true heart, anterior mouth and posterior anus,flow of nutrients is unidirectional. Cerebral ganglia ring anteriorly, chemoreceptors and mechanoreceptors, pigmented photoreceptors. The proboscis floats in fluid filled cavity, stylet in some species, can regulate lost stylets, stylrts so(cid:373)eti(cid:373)es have to(cid:454)i(cid:374)s, (cid:272)a(cid:374) (cid:862)shoot(cid:863) out the pro(cid:271)is(cid:272)is fro(cid:373) the rh(cid:455)(cid:374)(cid:272)ho(cid:272)oel, use this to (cid:272)at(cid:272)h prey.
