Ovipositor


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ovipositor

[′ō·və‚päz·əd·ər]
(invertebrate zoology)
A specialized structure in many insects for depositing eggs.
(vertebrate zoology)
A tubular extension of the genital orifice in most fishes.

Ovipositor

 

the external sexual organ in the females of many insects and some fish (for example, Rhodeus) by means of which eggs are laid. The ovipositors of insects are modified appendages to the eighth and ninth abdominal segments. They consist of three pairs of valves with the sexual orifice located between their bases. The valves of the ovipositor penetrate the substrate, and the eggs slide down between the valves during egg laying.

Because the eggs of Acrididae are placed into the soil in sacs that must be deposited at great depths, the ovipositor is strong and short and acts as a digging apparatus. The abdomen of the Acrididae can become elongated in order to push down the ovipositor. In dragonflies, true bugs, cicadas, and sawflies, the ovipositor places the eggs into plant tissue. Ichneumon flies and other hymenopterans have a long and sharp ovipositor that introduces eggs into the bodies of other insects, where the larvae live as parasites. The ovipositors of higher hymenopterans (honeybees, wasps, bumblebees) have become stingers—organs of protection and attack.

In fish the ovipositor is a modified urogenital papilla, which becomes elongated during spawning.

A. V. IVANOV

References in periodicals archive ?
The inflated endophallus of the eumolpine Colaspis pseudofavosa is long and thin, and has a pair of digits (the endophallic lateral digits) that apparently serve still another function, bracing open the tip of the female's ovipositor tube deep within her body (Flowers 1999).
Buca has a rounded ovipositor with gonoplacs missing marginal teeth which is consistent with Elicinae sensu Gnezdilov (2013b), but the structure of male genitalia and wing venation discussed below are not consistent with either of the described tribes (Elicini and Parathisciini), and so a new tribe is described to include the genus.
Ovipositor ancho, fuertemente curvado hacia arriba, margenesparalelosyampliamenteredondeados, apice finamente aserrado.
Metasoma Petiole Length 177 (124-225) Width (88-118) Genitalia Ovipositor sheath (length) 150 (115-171) Ovipositor sheath (width) 57 (47-65) Prong (length) 206 (158-242) Prong dorsal setae (no.
The structure of ovipositors in higher oribatid mites (Acari, Oribatida, Brachypylina).
We tentatively interpret this structure as an ovipositor since its annulate morphology and proportions relative to the body are suggestive of that in a modern eupnoid harvestman (e.
27): apofisis anteriores y posteriores subiguales en longitud; ductus bursae esclerosado con su mitad basal lisa y la porcion apical con numerosas estriaciones; bursa copulatrix bisacular, corpus bursae esferico y membranoso, sin signa; cervix bursae sacular; lobulos del ovipositor alargados, poco esclerosados y con espinas cortas y debiles en su superficie.
Females of this katydid species use their ovipositor to open longitudinal slits in branches, where they lay eggs (Costa Lima 1938); however, few eggs were found in banana trees.
Ovipositor short, wide, strongly curved with rough lateral surface (Fig.