BIOLOGY 2F03 Lecture Notes - Lecture 34: Dont, Damselfly, Ovipositor
11 Dec 2015
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Document Summary
Phylum arthropoda: segmented body, paired segmented appendages, bilateral symmetry, chitinous exoskeleton; shed and renewed during growth, 5-13 are all internal features. Subphylum (3 constant groups although classification is in constant flux, especially at the subphylum and infraphylum level: trilobita. Class arachnida- 8-legs, pedipalps, fangs, no antennae, ex. harvestman, scorpion and terminate in a fang that arises from the first segment of a primitive ancestor two main body parts (cephalothorax and abdomen) The spiders could be separated by the action of their jaws, orientation of their. Spiders can be grouped according to how they carry their egg sacs, whether they spin webs to trap prey and when they spin their webs (day or night). Spider mating is unusual given that the male"s copulatory organ is at the end of assorted spiders. simple eyes etc. its pedipalps. to its penis. The male must deposit sperm into a sperm web and then transfer the sperm.
