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Thelycum

A specialized genital modification of the three posterior sternites in female penaeidean shrimps.
(pl. thelyca) [Chace and Hobbs, 1969]
External pocket on ventral side of thorax in panaeid female serving as seminal receptacle. [McLaughlin, 1980]
External pocket on ventral side of thorax in penaeid females which functions as seminal receptacle (receptaculum seminalis). [Moore and McCormick, 1969]
External seminal receptacle, variously developed, lying on sternum of thorax and formed by outgrowths from last and next to last thoracic somites. [Williams, 1984]
Female copulatory organs situated in the ventral region of the thorax. [Mauchline, 1984]
Female genitalia comprising modified posterior two or three sternal plates (Dendrobranchiata). [Poore, 2004]
On the ventral surface of the thorax of a female penaeid shrimp; receives the spermatophore from the male during mating. [Bliss, 1982]
Specialized genital structure of the three posterior sternites in female penaeidean shrimps.
(pl. thelyca) [Butler, T. H.]
The female genetalia consisting of modifications of the posterior two, or sometimes three thoracic sternites (XII-XIV) serving for the storage or transfer of the sperm, usually in spermatophores, and often shielding seminal receptacles (Fig. 4A).
(pl. thelca) [Perez Farfante and Kensley, 1997]
(Taxon-specific: Order Decapoda) In female reproductive system of certain shrimp-like (natantian) decapods, pouch-like accessory copulatory structure formed by sternites of last and next to last thoracic somites. Serves as seminal receptacle and may be composed of several lobes or plates. [Stachowitsch, 1992]
(Taxon-specific: Order Euphausiacea) In female reproductive system, pouch-like accessory copula-tory structure on underside of thorax; associated with female gonopores and formed by sternite and coxal plates of posterior thoracic somite. Receives spermatophore of male. [Stachowitsch, 1992]