Corystidae, Samouelle, 1819

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 : 98

Family Corystidae

In Corystes the male gonopore is coxal, with the short penis emerging from the wide gonopore on the slope of the inclined P5 coxa, just above its coxo-sternal articular condyle ( Fig. 8A ). The penis consists of a soft papilla, wide at its base and prolonged by a narrow tip, and lying very close to the broad lateral foramen of G1 endopodite. In the very narrow posterior part of the sternum, the two short, thick G1s are very close to each other, their wide bases covering the penis. Abdominal somites 1 and 2 are dorsal, and the G1 and G2 have a long protopodite, a condition related to the dorsal position of the first three abdominal somites. In C. cassivelaunus the G1 exhibits negative allometry, intensified in post-pubertal individuals ( Hartnoll 1972a: 149, 153, fig. 6, table 5). The disposition is similar in the examined material of Gomeza and Jonas , the large and soft papilla emerging from a large gonopore (thus well protected) and lies very close to the broad lateral foramen of the G1 endopodite. See Monophyletic Heterotremata: Superfamily Corystoidea ).

Figures

FIGURE 8. Coxal gonopore in heterotreme families, including families with coxo-sternal condition (D, G, I–K). A, Corystes cassivelaunus (Pennant, 1777) (Corystidae), male 33.0 × 26.0 mm, Bay of Biscay, (MNHN-B27912); B, Thia scutellata (Fabricius, 1793) (Thiidae Thiinae), male 17.7 × 19.0 mm, Mediterranean Sea (MNHN-B416); C, Xantho hydrophilus (Herbst, 1790) (Xanthidae Xanthinae), male 20.5 × 33.0 mm, France, Concarneau; D, Goneplax rhomboides (Linnaeus, 1758) (Goneplacidae Goneplacinae), male 12.0 × 21.0 mm, Tunisia (MNHN-B10159); E, Pilumnus hirtellus (Linnaeus, 1761) (Pilumnidae Pilumninae), male, Mediterranean Sea (MNHN); F, Menippe mercenaria (Say, 1818) (Menippidae), male, Florida (MNHN-B9500); G, Ommatocarcinus macgillivrayi White, 1851 (Goneplacidae Goneplacinae), male 27.7 × 73.6, Australia, New South Wales (MNHN-B10216); H, Bythograea thermydron Williams, 1980 (Bythograeidae), male 33.0 × 60.0 mm, paratype, Galapagos Rift (MNHN-B6468); I, Rhizopa gracilipes Stimpson, 1858 (Pilumnoidea Rhizopidae), male 6.3 × 8.8 mm, Thailand (MNHN-B24500); J, Malacoplax californiensis (Lockington, 1877) (Panopeidae), male 10.0 × 14.0 mm, Gulf of California (MNHN-B10212); K, Prionoplax spinicarpus H. Milne Edwards, 1852 (Panopeidae), male 14.8 × 22.2 mm, holotype, [? China: erroneous origin] (MNHN-B10347). In E, F, penis emerging from P5 coxo-sternal condyle. a1, a3, abdominal somites 1, 3; c, coxo-sternal condyle; cx5, P5 coxa; e7, episternite 7; g, gonopore; m.l., median line; p, penis; 7, 8, thoracic sternites 7, 8; 6/7, 7/8, thoracic sternal sutures 6/7, 7/8.