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Lecture

Lecture 1 Lecture 1-Introduction to Cricket sound creation


Department
Biology
Course Code
BIO325H5
Professor
Glenn Morris

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Lecture 1
Midterm test feb 17th
Inherited variations in structure come to predominate in a population because they allow the individual
animals that have them to live and reproduce more successfully.
basad: towards base
polar bears without fur: fur is used to conserve body heat
fish have no pinnae(ear flaps): inconsistent with stream line, no flaps provide faster movement
arthropoda: exoskeletal segmentation
vertebrate: endoskeletal
Truss(X shape) where entire structure is called a tentorium:
-resists tension and compression
-anchors head corners
-anchors the four points of the head forming a fixation
book lice: prognathous- mouth parts points straight ahead
grasshopper: hypognathous mouth parts points down
If insect/grasshopper would squeeze on the seed, without the tentorium, the mandible would be able to
expand because it’s bound to the base of the head.
apodeme: inflexion of an exoskeleton
crickets are close relatives of katydids: > 5000 spp described
males broadcast an acoustic signal to attract females for mating
high diversity in species and morphology
calling songs are made by males rubbing their forewings together: usually right over left with
bilateral wing symmetry
they listen with eardrums on their foretibiae
males put themselves in risk by broadcasting a sound often at night
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