rostellum


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Related to rostellum: oncosphere, coracidium

rostellum

 [ros-tel´um]
a small protuberance or beak, especially the fleshy protuberance of the scolex (mouth) of a tapeworm, which may or may not bear hooks.

ros·tel·lum

(ros-tel'ŭm),
The anterior fixed or invertible portion of the scolex of a tapeworm, frequently provided with a row (or several rows) of hooks.
[L. dim. of rostrum, a beak]

rostellum

(rŏ-stĕl′əm)
n. pl. rostella (rŏ-stĕl′ə)
A small beaklike part, such as a projection on the stigma of an orchid or the hooked projection on the head of a tapeworm.

ros·tel′lar adj.

ros·tel·lum

(ros-tel'ŭm)
The anterior fixed or invertible portion of the scolex of a tapeworm, frequently provided with a row (or several rows) of hooks.
[L. dim. of rostrum, a beak]

rostellum

  1. a protruding, beak-like structure in some insects.
  2. the protrusion carrying the hooks on the SCOLEX of tapeworms.
References in periodicals archive ?
The scolex had four prominent round suckers of 349 [+ or -] 44.79 (325-400) pm of diameter, and a rostellum of 735 [+ or -] 82.79 (633-833) pm of diameter, armed with two alternating crowns of 17-19 hooks each (Fig.
Stigmatic cavity sub-apical, transversely elliptic; rostellum narrowly triangular, transverse to the column axis.
Stigmatic cavity orbicular, concave; rostellum apical, laminar, perpendicular to the column axis.
The rostellum has a double crown of approximately 30 hooks.
saginata has 15 to 30 lateral uterine branches in the gravid proglottids that are longer than they are wide and a scolex (head) with four suckers without a rostellum (projecting structure with hooks).
Cyclophyllidiea Tapeworm order in which the worms have four sucker discs encircling the scolex with or without a rostellum (for example Taenia spp.).
Hooklet The small hook-like organ of attachment present on the rostellum of the tapeworm scolex.