Polypedilum (Tripodura) lineatum Chaudhuri, Guha and Dasgupta, 1981

Mukherjee, Tuhar, Mukherjee, Bindarika & Hazra, Niladri, 2020, Revision of the Oriental species of Polypedilum Kieffer (Diptera: Chironomidae) with their phylogenetic relationship, Zootaxa 4820 (1), pp. 31-69 : 42

Polypedilum (Tripodura) lineatum Chaudhuri, Guha and Dasgupta, 1981

GenBank accession number: MN637873

Polypedilum (Tripodura) rectangulum Hazra, Sanyal and Brahma, 2015: 13 ; Hazra, Niitsuma and Chaudhuri, 2016: 94. Syn. n.

Materials examined: 1 male labelled ‘ Holotype Polypedilum (Tripodura) rectangulum Hazra, Sanyal and Brahma ( BUENTD 275 ), India, Assam, Guwahati (26.14, 91.73), 20.xii.2012, Coll. K. Sanyal’ ; 1 male labelled ‘ Paratype, Polypedilum (Tripodura) rectangulum Hazra, Sanyal and Brahma , India, Sikkim, Dentam (27.25, 88.13), 12.iv.2015, Coll. K. Sanyal’ ; 1 male labelled ‘ Holotype Polypedilum lineatum Guha and Chaudhuri , India, West Bengal, Burdwan, Raniganj (23.62, 87.11), 28.x.1977, Coll. D.K. Guha’ ; 1 male labelled ‘ Polypedilum lineatum India, West Bengal, Alipurduar, Falakata (26.51, 89.20), 26.v.2019, Coll. K. Sow’ .

Male (n=4)

Hypopygium ( Figure 7A ). Anal point 40–50 long, narrowly deflexed. Gonocoxite 40–80 long; gonostylus 120130 long; superior volsella 27 long, rectangular; inferior volsella 65–68 long with 2 long and 8 incurved setae.

Remarks. The type specimen of Polypedilum (T.) rectangulum is found to have identical pattern of wing spots and hypopygium with P. (T.) lineatum but superior volsella is little different in shape. So, P. (T.) rectangulum is a junior synonym of P. (T.) lineatum . The COX1 sequence of P. (T.) lineatum had ~3% divergence ( Figure 7B ) with the sequences in the data bases from Guanxi, China which is within the barcode gap for the species belonging to subgenus Tripodura ( Song et al. 2016) . Comparing the sequence of COX1 and uploaded image in BOLD data system, the species may appear to be distributed also in the Oriental China.

Distribution and ecology. India: West Bengal, Sikkim, Assam; China: Guanxi. The specimens from India were collected from places near rivers. The distribution indicates that the species have probably dispersed through eastern syntaxial bend of the Himalayas (Assam Gateway).

Figures

FIGURES 7A–B. A, Hypopygium of adult male Polypedilum (Tripodura) lineatum Chaudhuri, Guha and Dasgupta, 1981. Scale: 0.1 mm; B, Neighbor-Joining tree based on the COX1 gene sequences of Polypedilum (Tripodura) lineatum and three reference sequences of from GenBank. Circles mark nodes. Scale: 0.02 substitutions per nucleotide position.