Phylum Arthropoda. Phylum Arthropoda. “jointed foot” Largest phylum 900,000 species 75% of all known species Insects, spiders, crustaceans, millipedes, scorpions, ticks, etc. Phylum Arthropoda (cont’d). Most successful phylum Ecologically diverse Present in all regions of the earth
Drawing water into gills
Touch, taste, food handling
Displacement of seta initiates a nerve impulse in a receptor cell at its base
Eyes convert light energy into nerve impulses
- extinct trilobites
3. Subphylum Myriapoda
5. Subphylum Hexapoda
Wolf spider preparing egg sac
M. C. Barnhart
Wolf spider parental care- after the eggs hatch, the young ride on mom for several days.
lobsterWhat’s the difference between a crayfish and a lobster?
“nothing more than a little shrimplike animal standing on its head in a limestone house and kicking food into its mouth”