Table 1.

Morphological differences among Yuebeipotamon gen. n., Tenuilapotamon Dai, Song, Li, Chen, Wang & Hu, 1984, Sinopotamon Bott, 1967, and Longpotamon Shih, Huang & Ng, 2016.

Character	Yuebeipotamon	Tenuilapotamon	Sinopotamon	Longpotamon
Epibranchial teeth	distinct, sharp (Fig. 2A)	indistinct, granular (cf. Dai 1999: pl. 29)	varied (cf. Dai 1999: pl. 17)	varied (cf. Zou et. al. 2008: fig. 1)
Ambulatory legs	slender (Fig. 2A)	slender (cf. Dai 1999: pl. 29)	stout (cf. Dai 1999: pl. 17)	stout (cf. Zou et al. 2008: fig. 1)
Size of triangular structure of male thoracic sternites 1, 2	relatively large (Fig. 4C)	relatively small (unpublished data)	relatively small (cf. Shih et al. 2016: fig. 3C)	relatively small (cf. Shih et al. 2016: fig. 6C)
Male telson	relatively short, triangular (Fig. 2C)	relatively long, subtriangular (cf. Dai 1999: fig. 225)	relatively long, nipple shaped (cf. Dai 1999: fig. 139)	relatively long, subtriangular (cf. Zou et al. 2008: fig. 2)
G1	long, reaching beyond tubercle of abdominal lock (Fig. 2D)	short, not reaching tubercle of abdominal lock (cf. Dai 1999: fig. 225)	long, reaching beyond tubercle of abdominal lock (cf. Dai 1999: fig. 139)	short, not reaching tubercle of abdominal lock (cf. Dai 1999: fig. 137)
Terminal segment of G1	lo006Ecxcg, with subbasal flap (Fig. 3C)	short, without subbasal flap (cf. Dai 1999: fig. 225)	short, without subbasal flap (cf. Dai 1999: fig. 139)	short, without subbasal flap (cf. Zou et al. 2008: fig. 2)