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According to Phys.org (This article and its images were originally posted on Phys.org November 21, 2018 at 08:36AM.)
(a) Neotrogla sp. in copula. (b) Terminal abdomen of N. curvata in copula. Female structures are highlighted by red. (a–l) Morphology of the female (c–i,k) and male ( j,l ) genitalia in Sensitibillini, with the homology scheme indicated by colours. (c,i–j) Neotrogla truncata. (d) N. curvata. (e–f,k – l) N. aurora (note that N. brasiliensis and N. sp. also have this type of genitalia). (g) Sensitibilla etosha. (h) Afrotrogla oryx. Dotted regions of illustrations indicate membranes and others are sclerite ((c–h): approximately to scale). Arrowheads in (c–h) indicate the opening of the spermathecal duct, and arrowheads in ( j) and (l ) indicate the presence (filled) or the absence (open) of male vaginal pouches. (c–e) Lateral view; (f–i,k) ventral view; ( j,l ) dorsal view. Credit: Biology Letters (2018). DOI: 10.1098/rsbl.2018.0533
A team of researchers from Japan, Brazil and Switzerland has found evidence that suggests female penis-like appendages in two types of cave insects evolved independently. In their paper published in the journal Biology Letters, the group describes their study of Sensitibillini insects and what they discovered.
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