hypostome

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Related to hypostome: basal disc

hy·po·stome

(hī'pō-stōm),

The central unpaired holdfast organ of the tick capitulum; the hypostome is covered with recurved spines that enable it to serve as an anchoring device while the tick feeds.

[hypo- + G. stoma, mouth]

hypostome

any structure around or below the mouth, such as the oral cone in Hydra.

hypostome

an appendage on the ventral aspect of the oral opening of some insects and arachnids.

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References in periodicals archive ?

The associated hypostome has a subtriangular outline, an almost transverse anterior margin very gently curved distally, a rounded posterior margin and an elongate, suboval middle body.

First record of the Ordovician fauna in Mila-Kuh, eastern Alborz, northern Iran/Ordoviitsumi fauna esmaleid Pohja-Iraanis (Mila-Kuh, idapoolne Alborz)

Ticks feed exclusively on blood, and begin by cutting a small hole into the host epidermis with their chelicerae and inserting the hypostome into the cut, thereby attaching to the host.

Ticks and Tick Ecology in Mississippi: Implications for Human Disease Transmission

The key character of the 'Corynexochida' is fusion between the hypostome and the rostral plate, but the condition is often unknown and occasionally known to be different (for instance in Ogygopsis and dinesids; see also Hopkins & Webster 2009 and Robison & Babcock 2011).

Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China/Loode-Hiina Gansu provintsi Alam-Kambriumi (provisoorne Kambriumi seeria 2) trilobiidid

Morph A (pygidia GIT 585-4-1, GIT 585-3-1, Figs 3A, 4O-S; and possibly hypostome GIT 585-2-1, Fig.

Hirnantia sagittifera (Brachiopoda) and Mucronaspis mucronata s.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution/Hirnantia sagittifera (Brachiopoda) ja Mucronaspis mucronata s.l. (Trilobita) Baltikumi Ulem-Ordoviitsiumis: taksonoomia ning levik