Metamerism and Tagmata
Of all the countless shapes and forms that triploblastic metazoan animals take, the least
complicated the least specialized, is vermiform.
Vermiform: worm-shaped: longer than diameter cylindrical
[A worm consists] f
Sensory capacities of animals differ: different sensory modalities are emphasized by
different species: sight, sound, smell: light, mechanical waves, chemicals.
Both katydids and dogs hear ultrasonic sound frequencies. Dogs access a world
Mucus: is a viscoelastic sol-gel common in animals.
Mucus is a solution of glycoproteins, a viscous colloid also containing chemicals like antiseptic
enzymes lysozymes - that act against microbes. It can function as a barrier against bact
Topics: translocation, coelom: fluid filled cavity in mesoderm.
Coelomate animals. The coelomate phyla include Vertebrata , Echinodermata, Annelida -contrasts with acoelomates (without a coelom) and haemocoel animals (insects have a
Naturally selected for running; artificially selected for milk production.
Coelom as fluid skeleton: hydrostatic skeleton with antagonistic muscles: stress (force per
unit area) translocated by fluid
Observe an annelidan, a segmented worm
Bony fishes (teleosts), diversely speciose; mostly streamlined bodies, bone-supported flexible-fin
appendages, notochord replaced in development by a series of interlocking metameric bones
(vertebrae) and muscle blocks (myotomes); axial
Sphagnum or peat moss
Genus of roughly 150-350 mosses in the Phylum Bryophyta.
Sphagnum grows in a thick carpet that can hold 15-20 times the moss's dry weight in water.
Sphagnum creates wet, acidic, anoxic conditions wherever it grows. c
The fluid cavity of a nematode can evolve to an adaptive range of extensibility that depends upon the
relationship between the possible range of helical fibre angles and the fixed volume of the species.
Pick a particular fixed volume (up
Vertebrate eyes vary in parallax
Dr. Phil Pointing, UTM original: entomologist, photographer, professor, field biologist,
canoeist, fly fisherman, student of animal and plant adaptations, especially those arising
from physical factors.