BIOL 2P92 Lecture Notes - Lecture 1: Flea, Hexapoda, Ommatidium
22 Mar 2017
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Arthropods: has main blood vessels running on dorsal side of insect, has an open cavity. Main trait of hexapods with the exception of a few groups. Synchronous contraction: one nerve impulse per muscle contraction and wing stroke slow wing beat frequency (i. e. butterfly 4hz: butterflies do(cid:374)"t flap their (cid:449)i(cid:374)gs. They (cid:373)o(cid:448)e their (cid:449)i(cid:374)gs i(cid:374) a figure 8 (cid:373)otio(cid:374) Asynchronous: wings beat much faster than nerve impulses/muscle contractions fast wing beat frequency (i. e. Direct flight muscles are muscles attached to wings: during contraction, the force pulls down that is attached to a fulcrum, and pulls the wing down, during relaxation, the wings go up. Indirect flight: attached to top of thorax, thorax vibrates and drags wings causing it to flap. Diptera = 2 sets of wings: 2nd set of wings are known as haltares. Composed of ommatidium; i(cid:374)sects do(cid:374)"t see a thousa(cid:374)d images at the same time; only single image.
