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A reproductive aperture or pore, especially of certain insects and worms.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Zoology) an external pore in insects, earthworms, etc, through which the gametes are extruded
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈgɒn əˌpɔr, -ˌpoʊr)

an opening through which eggs or sperm are released, esp. in invertebrates.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
2B) comprising pediger 5, genital double-somite, three free abdominal somites, and caudal rami; pediger 5 acutely produced posterolaterally; genital somite incompletely fused to first abdominal somite with suture clearly visible; gonopore covered by plate-like leg 6 with outer seta, small terminal spine, and minute subterminal prominence; copulatory pores paired, located at posterior one-third length; anal operculum weakly developed, fringed with spinular row dorsally.
The gonopore processes are long and thin, and run backwards to end nearly halfway to the flexure.
10b) short and roughly triangular in shape with outer corner pointed, surrounding the gonopore, with obscure sensillae at lateral sides of gonopore above paramere, posterior margin slightly serrated and expanded distal margin; parameres very short, laterally concave, anteriorly broad, posteriorly averted with rounded blunt terminal ends, may without terminal microseta.
10 and 11) with paired short apical processes, preatrium little longer than aedeagal shaft, dorsal apodeme small in lateral view, gonopore apical on ventral surface.
Size at 50% maturity ([SM.sub.50]) could not be determined with chela or abdomen allometry, but [SM.sub.50] was estimated at 61.6 mm in carapace length for females on the basis of gonopore condition.
"I spent quite a bit of time reading the paper, " she writes, "and in doing so, I learned a few useful words, like annulate, epididymal, gonopore and nephridial."
Because the endosoma was broken during dissection, our drawing shows a fracture line just distad of the secondary gonopore. This specimen is missing the possess arising near the secondary gonopore (see characters 19 and 28 in Weirauch, 2007) that is diagnostic for all other species of Leptidolon.
The gonopore region of undissected males was conspicuous just below the styli, but the aedeagus was not visible (Figure 5).
In poeciliids, males use a modified anal fin (gonopdium) to transfer sperm to the female gonopore. As males mature, the third, fourth, and fifth anal fin rays elongate to form the gonopodium on which distal armaments such as hooks, elbows and serrae develop (Rosen and Gordon, 1953; Chambers, 1987).
From this position males move to nip at the female's gonopore similar to other poeciliids.