BIOL 1902 Lecture Notes - Lecture 16: House Finch, Tettigoniidae, Bronchus
15 Aug 2018
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Hold that toads have called amplexus sperm not guaranteed to meet the eggs. Hermaphrodite: doubles your chances of reproducing (both sexes) (earthworms) slow moving or sedentary: fresh water sponges and clams live in a colony and are filter feeders sperm goes down water into other sponges. Hermaphroditic to increase chance of water bringing sperm and fertilizing. Donors never meet: snow fleas = springtails. Never meet donor yet still internal fertilization leave spermatophore sacs left on the ground and are picked up or explode when female walks over it. Intromittent organ is anything that delivers sperm inside a body: slugs and snails they meet their donors love darts. Two intromittent organs called hemipenes (only one inflates at a time) Penis: delivery of sperm to eggs and secondary role: female stimulation. Cats barbs and hooks for female stimulation. Penis comes out and wanders around 40x body length. Wood pecker: bills agai(cid:374)st trees (cid:862)dru(cid:373)(cid:373)i(cid:374)g(cid:863) non vocal advertisement.
