epigynum

epigynum

[ə′pij·ə·nəm]
(invertebrate zoology)
The genital pore of female arachnids.
The plate covering this opening.
References in periodicals archive ?
Left palpus in prolateral view (A), left palpus in ventral view (B), left palpus in retrolateral view (C), epigynum in ventral view (D, N), habitus dorsal (E, H, K), habitus ventral (F, I, L), habitus lateral (G, J, M).
Vibrations are of long duration (~0.5s) and high amplitude Zig-zag approaching Walking towards the female in a zig-zag fashion while performing leg spreading and tremulation Palp insertion Inserting the palp in the female epigynum. It happens right after zig-zag walking.
Epigynum noticeably hard, with wide median septum(MS), epigynum scape with two depressions on its each side (Fig.2 c,d), Spermatheca (SPT) is kidney shaped, epigynal orifices (EO) strongly diverging detail dorsal structure show in line drawing.
Males of the latter genus can be recognized by their usually short embolus, with a proximal tegular lobe, distal hematodocha highly reduced, and finger-like RTA; and females by their epigynum without distinct window, and copulatory ducts usually short (Zhang & Maddison 2015).
n -- Abdominal setae long with acute tips (Fig.11) 6 6 Epigynum with wide transverse hood (Fig.47) transvaalicus Simon -- Epigynum with hood not as above 7 7 Abdomen widest at posterior end; dorsum blackish brown; femora I-IV ventrally with blackish brown half-rings crassispinus Lawrence -- Not as above 8 8 Epigyne with narrow elongated (Fig.
The female epigynum of the genus Hemicloea have a peculiar, folded scapus, which expands during copulation.
The nomenclature of the male palpus and female epigynum structures follows Redner & Dondale (1983).
The original description mentions 3 males and 2 females and the epigynum is dissected from the female, an additional label mentions "see slide 20, Smokies, Sept 18, 1937" but the slide and other specimens in the type series are missing.
Thus, the phylogenetic and biogeographic relationships of the genus are still uncertain; the three main competing hypotheses presented by these authors are that the genus is either (a) sister to the "Asian clade" of the Apocyneae; (b) sister to the genus Periploca; or (c) sister to the (Anodenon + (Aganosma + Epigynum)) clade.
While on the female's ventral side, the male drummed with his pedipalps on and near the female's genital openings (epigynum), and finally inserted a pedipalp into the female genital opening.
In his description, Chamberlin makes note of a spider having a carapace length over 10 mm and a "pale narrow median line extending backward from first eye row, widening abruptly in front of dorsal groove." He also mentions a clear abdominal pattern, light venter, and an epigynum as in Hogna helluo (Walckenaer 1837).