hypostome

Definitions

1. Any of certain mouth appendages of some insects, arachnids, crustaceans, and hydrozoa; in particular
2. Any of certain mouth appendages of some insects, arachnids, crustaceans, and hydrozoa; in particular:
3. The ventral mouthpart plate in trilobites;
4. The barbed attachment structure associated with the mouthparts of parasitic arachnids (e.g. ticks);
5. The oral tip surrounded by tentacles in hydrozoan cnidarians.

Equivalents

Examples

“This mode of attachment and support⟳ of the hypostome in proparian trilobites is also shown by Öpik's work⟳ (1938, and references) and by Whittington (1941b, p. 514-517) and Evitt and Whittington (1953).”

“2012, Georgia E. Lesh-Laurie, Chapter 5. Expression and Maintenance of Organismic Polarity, Allison L. Burnett (editor), Biology of Hydra, Harcourt Brace Jovanovich (Academic Press⟳), pages 160-161, As a result⟳ or these interactions, the presence of a hypostome inhibits the formation of another hypostome nearby. Removal of the hypostome causes the level of inhibition to fall⟳; regeneration of it restores this level (Webster, 1966).”

“The polyps of the two observed populations of Alatina cf. moseri showed no distinct differences.[…]The body of the polyp is divided into three parts: the hypostome, the calyx and a stalk region. The latter includes a basal disc and a tiny periderm beaker enveloping the pedal region. The hypostome of polyps of both populations was four-lipped (Fig. 5.33F and G), balloon-shaped and ~14%–15% of the total body length (TBL). It was not completely contractible into the body.”

“Figure⟳ 7.4 Argas persicus^([fowl tick])[…](b) Hypostome of larval stage⟳. The toothed hypostome is easily visible in the larval stage⟳.”

CEFR level