Ecdysozoa protostomes {arthropod} (Arthropoda) can have appendages.
segmentation
Species have numbers of body segments. All arthropods have same body plan, with six head segments {head, arthropod}, then middle segments {thorax, arthropod}, and then end segments {abdomen, arthropod}.
appendages
Arthropods have paired jointed appendages, used for swimming, walking, sperm transfer, or mouth parts.
coelom
Arthropods have true coelom, with reproductive organs.
digestion
Digestive system is annelid-like.
excretion
Excreting system can empty into digestive tract.
nervous system
Arthropod nervous systems are annelid-like, but ganglia fuse more in higher arthropods. Arthropods have ganglia groups, each controlling one activity, in ring around gut.
eyes
Compound eyes work like fish-eye lenses and show continuous scenes. Bees can process 300 images per second and can see ultraviolet but not reds.
pigments
Arthropods have hormones for pigmentation and reproduction.
behavior
Arthropods respond by kinesis, immobilization, orientation, or navigation. Arthropods have instincts, initiated by stimuli. Some arthropods have biological clocks. Arthropods can learn to run mazes. Arthropods can measure lengths and angles, for honeycombs and spider webs.
Biological Sciences>Zoology>Kinds>Arthropod
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Date Modified: 2022.0224