Lepidostoma truncatum, Parey & Saini, 2012

Parey, S. H. & Saini, M. S., 2012, Four New Species Of Genus Lepidostoma Rambur (Trichoptera: Lepidostomatidae) From India, Acta Zoologica Academiae Scientiarum Hungaricae 58 (1), pp. 31-40 : 34

Lepidostoma truncatum sp. n.

( Figs 7–12 )

Description: Body brown, middle and hind legs dark brownish. Scapes ( Fig. 10 ) each 2.91 mm, with two subequal subbasodorsal processes curved toward each other. Maxillary palps ( Fig. 10 ) each 0.98 mm, two-segmented, basal segment three times longer than apical one. Length of each forewing 7.7 mm. Wing venation of this species is similar to that of L ferox and is given in Fig. 12 .

Male genitalia ( Figs 7–10 ): Apicodorsal margin of segment IX bluntly pointed. Segment X divided by deep and narrow incision reaching to its base; each half bearing dorsolateral and mesal processes: in lateral view dorsolateral processes broad at base, mesal processes rounded and serrated apically; segment X appearing as bilobed structure. Inferior appendages each two-segmented, 1st segment triangular in outline with broadened base, 2nd segment broadened apically with slight apical excision; basodorsal processes absent. Phallobase with small dent at its centre, phallicata slender and cylindrical; parameres much longer than phallus.

Diagnosis: The male of this species closely resembles that of Lepidostoma ferox MCLACHLAN, but differs from the latter by having segment IX apicodorsally produced into round lobes, not semicircular lobes; ventrally tergum IX is quadrate, not rectangular. Segment X has an excision only in its apical 1/3rd, not to the middle as in L. ferox. The scapes each have two basal processes, not a single basal process. Maxillary palps are straight, not curved; the 1st segment is straight, not bent, the 2nd segment is cylindrical, not slendrical.

Material: Holotype male, India: Himachal Pradesh, Ahla , 2000 m, 11-vii-2010 ( MDZPUP).

Female and immature stages: Unknown.

Etymology: The name of the species is based on truncate structure of the lateral processes of segment X.

Figures

Figs 7–12. Lepidostoma truncatum sp. n.: 7 = male genitalia, dorsal view; 8 = male genitalia ventral view; 9 = male genitalia, left lateral view; 10 = phallic apparatus, left lateral view; 11 = head, scape and palps, right lateral view; 12 = right forewing, dorsal view