Phylum Arthropoda. Phylum Arthropoda. â€œjointed footâ€ Largest phylum 900,000 species 75% of all known species Insects, spiders, crustaceans, millipedes, scorpions, ticks, etc. Phylum Arthropoda (contâ€™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”