Iron martinus Braasch & Soldán, 1984

Material examined. 5 La, Chiang Rai Province, Khun Kon Waterfall, 19°52’59.11’’N, 99°36’58.39’’E, alt. ca 800 m; II. 2004, leg. Braasch; DB.

Diagnosis. Iron martinus is easily recognized among the few South-east Asian representatives of the genus (s. above) by having rhomboid head, pairs of moderately long spines on terga I–IX, large but narrow gill I forming a sucking disc, an unfolded gill VII and a dark femur spot (Braasch & Soldán 1984a: p. 113, Figs. 35–44; Nguyen & Bae 2004b: p. 103, Figs. 1–6). Femur spot present in Vietnamese specimens (Nguyen & Bae 2004b: p. 103, Fig. 2) as also proved by (Braasch & Soldán 1984: p. 111: ‘Auf den Femora Femurfleck’), and it is likewise present in specimens from Thailand.

Second south-east Asian species of genus, Iron longitibius sp. nov. (s. above) differs from I. martinus by having rounded triangular head with anterior margin straight and slightly emarginated, spine-less terga, relatively long foretibiae (ca. 1.2 length of forefemora), gill I greatly extended, overlapping beneath abdomen and broadened anteriorly forming sucking disc, and gill VII elongated, curved downward, without fold. Comparison with other Asian Iron -species is presented under foregoing Iron longitibius .