hypostome


Also found in: Dictionary, Encyclopedia, Wikipedia.
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.
Mentioned in ?
References in periodicals archive ?
9 Usually ornate, dentition of hypostome 3/3 .........................................
As blood and tissue fluids pool into the wound, they are sucked up by the hypostome, which also anchors the tick into the skin by means of the recurved hooks.
bursaria -0.4334 0.0001 0.1329 0.0001 0.1562 0.0174 Rotaria 0.2116 0.0502 0.1063 0.0001 NR NR Hypostome sp.
The alimentary canal is visible on the occipital ring, but its anterior continuation on the glabella is not known, as the axial part of the cephalon shows only the lower ventral surface of the hypostome (Hy in Fig.
Its longitudinally conducted impulses are thought to be generated in a circumferential nerve ring located just below the hypostome (Passano and McCullough, 1963; Kass-Simon, 1972; Kass-Simon and Passano, 1978; Kinnamon and Westfall, 1981; Koizumi et al, 1992), but may also originate elsewhere in the ectoderm of the body column (Kass-Simon, 1970).
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.
Hypostome subrectangular in shape and cone shaped distally, with 4 pairs simple hypognathal setae (hg1-hg4) and 2 pairs adoral setae, with dot like lobes (Fig.
For instance, immunoreactivity to the neuropeptide FMRFamide is broadly distributed in cnidarians and has been detected in the head (in both the hypostome and tentacles), base, and body column of hydra (Grimmelikhuijzen, 1983b; Grimmelikhuijzen et al., 1989).
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).
Zooanthellate digestive cells of Myrionema ambionense have two general shapes: columnar from the hypostome (= cup) region of the hydranth (also called digestive cells here, Fig.