Lecture—10 December 2003

Bioluminesence—

Bacteria—

Photophore

Mesopelagic or deep water squid

Giant nerve fibers—their role in squid

Arthropods—

Segmentally arranged—fusion of segments, tagmatization

Simple eyes (ocelli) or compound eyes (series of ocelli)

Molting—ecdysone

Hormones production in one gland, but action affects the target organ which is at a distance from the gland

Glands near the base of the brain (x and y glands) that produce the ecdysone

Color change in crustaceans

Chromatophores—respond to chemicals rather nerve impulses