Inachidae, MacLeay, 1838

GUINOT, DANIÈLE, TAVARES, MARCOS & CASTRO, PETER, 2013, Significance of the sexual openings and supplementary structures on the phylogeny of brachyuran crabs (Crustacea, Decapoda, Brachyura), with new nomina for higher-ranked podotreme taxa, Zootaxa 3665 (1), pp. 1-414 : 126

Family Inachidae

The male gonopore is coxal. It occupies a posteriormost location in relation to sternite 8, far from suture 7/8 ( Figs. 49B, C, 50A). Its large opening is situated at the limit between the anterior margin of the coxo-sternal condyle and that of the coxa itself, the P5 coxo-sternal condyle fitting a gynglyme in a notch on the lateral border of sternite 8. The penis exits from the gonopore close to the thick articulating membrane of the P5 coxa (the markedly moveable coxae of all pereopods have thick articulating membranes, probably correlated with decoration behaviour) and it is overhanged by a roof formed by an excavation of sternite 8 ( Fig. 49B). The trend to a coxo-sternal condition is obvious (See Modalities of penis protection: Coxo-sternal protection). A posteriormost location of the male gonopore also occurs in Oregoniidae ( Fig. 1A), Inachoididae ( Fig. 50C, E), and all other Majoidea ( Fig. 50G) (see Family Inachoididae below; Monophyletic Heterotremata: Superfamily Majoidea ; Affinities between Inachoididae and Inachidae ).