hypostome

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hypostome

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From hypo- +‎ -stome.

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hypostome (plural hypostomes)

1. (anatomy) Any of certain mouth appendages of some insects, arachnids, crustaceans, and hydrozoa; in particular:
   1. The ventral mouthpart plate in trilobites;
   2. The barbed attachment structure associated with the mouthparts of parasitic arachnids (e.g. ticks);
   3. The oral tip surrounded by tentacles in hydrozoan cnidarians.
   • 1953, H. B. Whittington, W. R. Evitt, Memoir 59: Silicified Middle Ordovician Trilobites, Geological Society of America, page 20:

     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).

   • 2020, Fatma El-Bawab, Invertebrate Embryology and Reproduction, Elsevier (Academic Press), page 251,

     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.

   • 2022, Alan Gunn, Sarah J. Pitt, Parasitology: An Integrated Approach, 2nd edition, Wiley, page 191,

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

• hypostoma

• hypostomal
• hypostomial

• homotypes, phytosome