Genital Pore

genital pore

[′jen·ət·əl ′pȯr]
(invertebrate zoology)
A small opening on the side of the head in some gastropods through which the penis is protruded. Also known as genital orifice.

Genital Pore

 

a paired or unpaired opening in cyclostomes and some bony fishes that connects the body cavity to the environment and that serves to eliminate eggs and sperm. Genital pores are found in cyclostomes of both sexes; they open into the urogenital sinus (lampreys, Bdellostoma) or into the cloaca (hagfishes). Genital pores are not paired in many eels or in several teleosts, including salmon. In these fishes only females have a single genital pore, which is usually situated behind the anal opening.

References in periodicals archive ?
For example, Oopelta differs by having an oxygnathous jaw; no caudal pore; the genital pore situated anteriorly near the tentacles; a penile structure; and the retractor muscles of the four tentacles being extremely shortened, each with its own origin.
Sagittal sections of the genital pore region of worms in Brazilian patients showed the cirrus sac lying horizontally with the seminal vesicle lying dorsocaudal to it, as described by Dick et el.
Body flat, spatulate, nonspinous; oral sucker subterminal; ventral sucker in anterior half of body; pharynx present; esophagus short; ceca long; testes tandem, in posterior third of body; ovary intertesticular; cirrus sac in hindbody, anterior to gonads; cirrus spiny; seminal vesicle bipartite, internal; genital pore in hindbody, ventral to left cecum; vitelline follicles around ceca in fore- and hindbody; uterus confined to hindbody; metraterm present.
Body divided into flat forebody, containing the suckers and bulbous tribocytic organ, and a cylindrical hindbody which contains the organs of reproduction; testes tandem, in middle of hindbody; cirrus sac absent; seminal vesicle free in parenchyma; thick-walled paraprostate organ posterior to testes; genital atrium present; genital pore dorsal, near posterior end of body; hermaphroditic canal present; vitelline follicles in both fore- and hindbody or confined to forebody; parasitic in intestine of reptiles, especially alligators.
complexus included flattened conical-shaped spines covering the entire body and sharply-attenuated spines seen around the periphery of the genital pore and the oral sucker.
6, 7) covering the entire body (except the aspinose rim of the oral sucker) and sharply-attenuated spines seen primarily around the periphery of the genital pore (Figs.
Genital pore just submedian to right, immediately anterior to posterior testis.
Genital pore lies in midline of body halfway between oral and ventral suckers beneath gut bifurcation, in some specimens slightly more towards oral sucker (Fig.
quadruncus, have evolved modifications that appear to function as a blocking device - essentially a big ball of tissue blocking most of the genital pore - restricting entry of the male's gonopodial tip.
1,4,5,7) They are longer than they are wide (approximately 12 by 3mm), (8) contain two sets of reproductive organs, are tapered at both ends, and possess a genital pore on both sides (Figure 2).
In this species first male sperm precedence was found when two males inseminated a single genital pore (Snow & Andrade 2005) and when the first tip was deposited in the entrance of the spermatheca (Snow et al.
multilocularis, based on the most important morphometric parameters of adult stages (length of worms, number of proglottids, terminal proglottids in percentage of total worm length, position of genital pore, and form of uterus) (2).