Hypostome | definition of hypostome by Medical dictionary
Also found in: Dictionary
Related to hypostome: basal disc
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.
an appendage on the ventral aspect of the oral opening of some insects and arachnids.
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.
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.
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).
Morph A (pygidia GIT 585-4-1, GIT 585-3-1, Figs 3A, 4O-S; and possibly hypostome
GIT 585-2-1, Fig.