Spiders, insects, centipedes, scorpions, shrimp, crabs, lobsters, butterflies Jointed appendages The world arthropod population has been estimated at a billion billion
BSC 2010L. INVERTEBRATES II. Principal Biological Concepts to Emphasize: ... you view '33A Characteristics of Invertebrates' on Student Media CD-ROM for review. ...
... scorpions Most are predaceous Class Arachnida (cont d) Most are harmless/beneficial to humans Class Arachnida (cont d) Some spiders (ie. black widow, ...