are arthropods? Arthropods are among the most familar
animals to us. 75% of all known animal species belong to Phylum
Arthropoda.They include land-dwelling animals like insects,
spiders and scorpions. Arthropods that are found in the sea
include crabs, shrimps, hermit crabs, horseshoe crabs, mantis
shrimps and barnacles.
features: Arthropods have a harded outer skeleton
(exoskeleton) called the cuticle. 'Arthropoda' means 'jointed
foot' in Greek. Indeed, arthropods have jointed legs. Arthropods
make up most of all known animals, so this body plan seems to
uses: Arthropods are well used by people everywhere.
They are among our favourite food! Remember that crabs and shrimps
are also arthropods. Insects have influenced humans since the
beginning of time. Their useful functions include pollinating
our food crops. On the flip side, they also spread disease and
destroy our food crops.
Arthropoda: some subgroups
Class Merostomata (horseshoe crabs)
Class Arachnida (spiders, scorpions)
Class Myriapoda (centipedes, millipedes)
Class Insecta (insects)
Infraorder Penaeidae (shrimps)
Infraorder Caridae (shrimps)
Infraorder Astecidae (lobsters)
Infraorder Anomura (hermit
Infraorder Brachyura (true
Subclass Cirripedia (barnacles)
from Pechenik, Jan A., 2005. Biology of the Invertebrates.