Hygrobates (Hygrobates) cf. longiporus Thor, 1898

Pesic, Vladimir, Yam, Rita S. W., Chan, Benny K. K. & Chatterjee, Tapas, 2012, Water mites (Acari, Hydrachnidia) from Baishih River drainage in Northern Taiwan, with description of two new species, ZooKeys 203, pp. 65-83 : 73

Hygrobates (Hygrobates) cf. longiporus Thor, 1898 Figs 7 A–D

Material examined.

ECL-BA-3: 23.ix.2009 4/0; ii.2010 0/3/0; vi.2010 2/0. ECL-BA-4: 17.vi.2009 1/0/0. ECL-BA-5: iv.2010 1/0/0; 07.vii.2010 5/0; 27.vii.2010 19/0; 30.x.2010 0/2/0. ECL-BA-6: 17.vi.2009 3/2/0; 17.vi.2009 7/0; vi.2010 0/3/0; 01.vii.2010 2/0/0; 27.vii.2010 12/0 (0/1/0 mounted); 29.ix.2010 0/1/0.

Remarks.

The most abundant Hygrobates species from the Baishih River drainage resemble to the Palaeractic Hygrobates longiporus Thor. In shape of coxal (Fig. 7A) and genital field (Figs 7B, D) and palp (Fig. 7C), no differences can be found to differentiate the specimens from Taiwan. Two additional species closely related to Hygrobates longiporus are described from Oriental part of China ( Jin 1997), Hygrobates neolongiporus Jin 1997 (Guangxi, Guizhou) and Hygrobates corimarginatus Jin 1997 (Yunnan). According to the original description ( Jin 1997), Hygrobates neolongiporus differs from Hygrobates longiporus in Cx-IV medial margins more closely approached to each other, more elongated Ac-3 and the triangular genital sclerites; Hygrobates corimarginatus differs in having a fewer denticles on the ventral side of P-2 and P-3 and genital field with more extended border of secondary sclerotization. However, all these characters are probably individually variable, and should be investigated with further specimens from the type area. For the time being, the populations from Taiwan are provisionally assigned to Hygrobates longiporus . However, for a judgement on the taxonomic state, the diagnostic features and taxonomic relationship of the Asian species of ‘longiporus’ species group require further revision.

Distribution.

Palaearctic. New for Taiwan.