Orithyiidae, Dana, 1852

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 : 128

Family Orithyiidae

The male gonopore is coxal in this monotypic family, often ranked to Orithyioidea . In Orithyia , a thick and short penis emerges from the extremity of the large P5 coxo-sternal condyle (see Modalities of penis protection: Condylar protection). The condyle moves freely, with only a small basal portion articulating on a narrow elevation of sternite 8. The penis is covered by a sclerotised sheath, followed by a soft papilla after its emergence ( Fig. 31A ). See Monophyletic Heterotremata: Superfamily Orithyioidea .

Figures

FIGURE 31. A–D. Condylar protection: penis within P5 coxo-sternal condyle. A, Orithyia sinica (Linnaeus, 1771) (Orithyiidae), male 80.0 × 74.0 mm, North China Sea (MNHN-B11612); B, Sayamia germaini (Rathbun, 1902) (Parathelphusidae), male 35.9 × 44.0 mm, holotype of Potamon (Parathelphusa) germaini, Vietnam (MNHN-B5162): penis emerging from extremity of long condyle; C, Leurocyclus tuberculosus (H. Milne Edwards & Lucas, 1842) (Inachoididae), male 33.6 × 36.8 mm, Urugay (MNHN-B9366); D, Stenorhynchus lanceolatus (Brullé, 1837) (Inachoididae), male 34.0 × 16.0 mm, West Africa (MNHN-B21437). E. Non-condylar protection in Dilocarcinus pagei pagei Stimpson, 1861 (Trichodactylidae), male 40.0 × 50.0 mm, Bolivia (MNHN-B12813): penis, with thick sheath, emerging from oblique superior border of condyle. F. Vestigial pleopods on male abdominal somite 5 of Orithyia sinica, same data as in A. a5, a6, abdominal somites 5, 6; c, coxo-sternal condyle; cx5, coxa of P5; e7, episternite 7; G1, first gonopod; I, prominence of sternite 8; m.l., median line; p, penis; pa, papilla; t, sclerotised sheath; te, telson, v, vestigial pleopod; 6–8, thoracic sternites 6–8; 7/8, thoracic sternal suture 7/8. Scale bars: 5 mm (A, F); 1 mm (partial enlargement of A).