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jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes Arthropoda , phylum Arthropoda
marine invertebrates that resemble mollusks Brachiopoda , phylum Brachiopoda
from 544 million to about 500 million years ago; marine invertebrates Cambrian , Cambrian period
enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids class Onychophora , Onychophora
in some classifications considered a separate phylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx class Tardigrada , Tardigrada
single-host parasites of lower vertebrates and invertebrates Cnidosporidia , subclass Cnidosporidia
parasitic on the digestive epithelium of vertebrates and higher invertebrates coccidium , eimeria
shell of some invertebrates like insects cuticle
marine invertebrates with tube feet and five-part radially symmetrical bodies echinoderm
radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers Echinodermata , phylum Echinodermata
exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs exoskeleton
any of various organs of locomotion or attachment in invertebrates foot , invertebrate foot
flagellates parasitic in alimentary or genitourinary tracts of vertebrates and invertebrates including humans genus Trichomonas
vermiform protozoans parasitic in insects and other invertebrates gregarine
parasite in invertebrates and lower vertebrates of no known economic importance haplosporidian
immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose larva
regeneration on a reduced scale of a body part; observed especially in invertebrates such as certain lobsters morphallaxis
region around the mouth in various invertebrates peristome
small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals spicule , spiculum
slender, flexible part of invertebrates used for feeling or locomotion tentacle
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