Pseudosmittia kisotriangulata Sasa et Kondo, 1993

Saether, Ole A., 2006, Japanese Pseudosmittia Edwards (Diptera: Chironomidae), Zootaxa 1198, pp. 21-51 : 33-35

Pseudosmittia kisotriangulata Sasa et Kondo

( Figs. 8, 9 )

Pseudosmittia kisotriangulata Sasa et Kondo, 1993: 101 ; Yamamoto (2004: 89).

Material examined JAPAN: Honshu, Aichi Pref., Bisai, Kiso River , holotype ♂, 21.xii.1989, S. Kondo ( NMST, No. 222: 73) .

Diagnostic characters

The species differs from other Japanese species except P. oxoniana by having a virga consisting of a median single spine difficult to distinguish, and strong lateral spinules; superior volsella absent; inferior volsella with accessory lobe always present; and dorsomedian sections of antepronotal lobes and oral projections of transverse sternapodeme usually well developed. The male imago differs from similar species by having an AR of about 2.0. Inner verticals appear to be lacking as in P. ruttneri Strenzke et Thienemann, 1942 . The combination of very large body size, the high antennal ratio and strong virgal spines will separate the species from all other Pseudosmittia .

Description Male (n = 1). Total length about 3.9 mm. Wing length 2.29 mm. Total length/wing length about 1.7. Wing length/length of profemur 3.23. Coloration brownish black.

Head ( Sasa & Kondo 1993: fig. 7.4a). AR 2.02. Terminal flagellomere 808 m long. Temporal setae about 5, consisting of outer verticals. Clypeus with 10 setae. Tentorium 143 m long, 45 m wide. Stipes 135 m long, 45 m wide. Palpomere lengths (in m): 41, 75, 188, 152, 184; third palpomere apparently with 1 lanceolate sensillum clavatum.

Thorax ( Sasa & Kondo 1993: fig. 7.4c). Antepronotum with well developed but slightly narrowed median lobes and apparently 2 lateral setae. Dorsocentrals 8, acrostichals 2, prealars 3, supraalars absent. Scutellum with 6 setae.

Wing ( Fig. 8 ; Sasa & Kondo 1993: fig. 7.4d). VR 1.18. Anal lobe projecting. Costal extension about 23 m long, R 4+5 ending distal to apex of M 3+4, Cu 1 sinuate. Brachiolum with 1 seta, R with 3 setae, R 4+5 with 1 seta, other veins bare.

Legs. Spur of fore tibia 68 m long, spurs of middle tibia 26 m and 19 m long, of hind tibia 60 m and 23 m long ( Sasa & Kondo 1993: fig. 7.4e–g). Width at apex of fore and middle tibiae 43–45 m each, of hind tibia 49 m. Comb of 12 setae, 23–41 m long. Lengths (in m) and proportions of legs as in Table 3 .

Hypopygium ( Fig. 9 ; Sasa & Kondo 1993: fig. 7.4j): Anal point apparently about 32 m long, tergite IX including anal point with about 15 setae, laterosternite IX with 7 setae. Phallapodeme 90 m long; transverse sternapodeme 75 m long, with weak oral projections. Virga consisting about 30 strong spinules and probably a median spine. Gonocoxite 236 m long; superior volsella absent; inferior volsella prominent with low accessory lobe, reaching to 0.61 and 0.76 gonocoxite length, respectively. Gonostylus 94 m long, megaseta 13 m long. HR 2.52, HV about 4.1. Female, pupa and larva: Unknown.

Distribution and ecology

The species is known only from the type locality, where it emerged from a bottom sample in the Kiso River. Like the closely related P. ruttneri this species thus is probably truly aquatic.

Figures

FIGURES 5–9. Pseudosmittia spp., male imagines. 5. P. holsata Thienemann et Strenzke (holotype of P. hachijotertia Sasa), hypopygium. 6–7. P. jintuoctava (Sasa), wing (6), hypopygium (7). 8–9. P. kisotriangulata Sasa et Kondo, wing (8), hypopygium (9).

Tables

TABLE 3. Lengths (in m) and proportions of legs of Pseudosmittia kisotriangulata Sasa et Kondo, male (n = 1).

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BV	SV
p1	709	945	444	255	170	113	66	0.47	3.47	3.72
p2	822	907	473	246	180	104	66	0.52	3.70	3.66
p3	832	992	524	274	236	113	66	0.53	3.40	3.48