Tardigrada

Thesaurus

Noun

Tardigrada - 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 pharynxclass TardigradaArthropoda, phylum Arthropoda - jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedestardigrade - an arthropod of the division Tardigradaclass - (biology) a taxonomic group containing one or more orders

Tardigrada

[tär′dig·rə·də] (invertebrate zoology) A class of microscopic, bilaterally symmetrical invertebrates in the subphylum Malacopoda; the body consists of an anterior prostomium and five segments surrounded by a soft, nonchitinous cuticle, with four pairs of ventrolateral legs.

Tardigrada

a phylum of very small invertebrates, closely related to the Arthropoda, to which they were assigned until recently. The short body, which measures 0.1–1.0 mm in length, lacks distinct segmentation. It has four pairs of unjointed nodulelike legs, with two to nine long, setaceous tarsal digits. There are two ocelli. The mouth organs are a pair of sharp styles that serve to pierce the cell membranes of the algae and mosses that the Tardigrada feed on. The digestive tract is a straight tube extending the length of the body. Respiration is cutaneous. The organisms are dioecious. The young, which resemble adults, emerge from deposited eggs.

Representatives of the phylum, which comprises approximately 300 species, are ubiquitous, inhabiting seas, fresh waters, moss, and soil. Terrestrial species after drying are capable of surviving years in a state of anabiosis. Members of the phylum can tolerate several hours at temperatures as low as - 271°C and as highasl50°C.

Tardigrada

Related to Tardigrada: tardigrade, Pentastomida

noun

Synonyms for Tardigrada

noun 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

Synonyms

class Tardigrada

Related Words

Arthropoda
phylum Arthropoda
tardigrade
class