BIO 112 Lecture 4: 4 Lophotrochozoans Part 1 Lecture Outline Zoology 4
5 Oct 2016
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Live in: marine, freshwater, and moist terrestrial. Most members have lophophore or trochophore larvae; flatworms have neither. Where body cavity would be is filled in with parenchyma tissue derived from the. Ganglia in head and ventral nerve cords. Cephalized: ganglia/brain and sensory receptors at head end. Have neurons with specialized functions: sensory, motor, association. Chemical, touch, balance (statocysts), light ( photoreceptors) Ocelli (eyespot): pigment layer that detect light, photoreceptors to send information to nervous system. Regeneration: can repair if a chunk is taken off. Fission: can constrict behind pharynx and separate into two. Definitive host: where adults live, usually vertebrates. Marine flatworms with wide variety of colors and patterns. Adults live in many body parts: liver, lung, intestines, blood. Multiple hosts in lifecycle; can be very complex. Adults mostly parasitize vertebrates and live in their intestines. Widely deviates from the basic body plan. To get oxygen into cells by diffusion you must be around water.
