Labiobaetis multus (Müller-Liebenau, 1984)

Fig. 1 d

Baetis multus Müller-Liebenau, 1984: 263.

Labiobaetis multus (Müller-Liebenau): McCafferty and Waltz 1995: 21.

Material examined.

Thailand • 1 larva; Trang Prov., Na Yong Distr., Wang Nam Rab resort; 07°34'32"N, 99°47'13"E; 142 m; 18.v.2017; leg. C. Suttinun; on slide; GBIFCH 01556161; VMCMU • 1 larva; Trang Prov., Yan Tha Khao Distr., Klong Tha Ped; 07°29'33"N, 99°46'26"E; 50 m; 18.v.2017; leg. C. Suttinun; on slide; GBIFCH 00980855; VMCMU • 9 larvae; Trang Prov., Huai Yod Distr., Khao Lak waterfall; 07°43'44"N, 99°44'21"E; 66 m; 18.v.2017; leg. C. Suttinun; 9 in alcohol; GBIFCH 00980853, GBIFCH 00763798; MZL .

Diagnosis.

Larva. Following combination of characters differentiate L. multus from other species of the group batakorum: head and thorax dorsally beige with grey-brown markings, abdomen dorsally grey-brown, laterally whitish with black markings, terga V and X brighter (Fig. 1 d); hind protoptera well developed.

Comparison.

The species differs from L. mon sp. nov. and L. lahu sp. nov. mainly by the colour pattern of the larva (Fig. 1 d). The figured larva is from Sumatra (Kaltenbach and Gattolliat 2019 b), its conspecificity with material from Thailand is supported by morphology and a COI sequence. Additionally, Fig. 1 d is in line with a picture of the type series of L. multus (Müller-Liebenau 1984: fig. 24).

Distribution.

Malaysia (Selangor), Indonesia (Sumatra), Thailand (Fig. 32 a).