Kamimuria obtusa, Sivec & Stark, 2008

Sivec, Ignac & Stark, Bill P., 2008, New Species Of Kamimuria Klapálek (Plecoptera: Perlidae) From Thailand And Vietnam, With Notes On Chinese Species, Illiesia 4 (12), pp. 110-138 : 119-121

Kamimuria obtusa sp. n.

( Figs. 33-42 , 78-79 )

Material examined. Holotype ♂ from Thailand , Doi Inthanon National Park, Huai Sai Leung, 98° 35’ E, 19° 23’ N, 1060 m, 7-8 May 2002, Chiang Mai University team ( PMSL). Additional paratypes: Thailand: type locality, 20 March 2002, I. Sivec, 5 ♂, 1 ♀ ( PMSL). Same site, 4 April-3 May 2003, 2 ♂ ( PMSL). Same site, 25-26 February 2003, 1 ♂ ( PMSL). Same site, 14-15 March, 2 ♂ ( PMSL). Same site, 3-4 April 2003, 2 ♂ ( PMSL). Same site, 4 April 2002, 3 ♂, 1 ♀ ( PMSL). Same site but Namtok Siripum , 98° 31’ E, 18° 32’ N, 1460 m, 2-3 April 2002 , 1 ♂ ( PMSL). Same site, 7-8 June 2002 , 5 ♂ ( PMSL). Same site, 2 March 2002 , 1 ♀ ( PMSL). Same site but Bang Khun Klang , 98° 32’ E, 18° 32’ N, 1200 m, 19-26 June 1990 , 2 ♂, 1 ♀ ( PMSL). Same site, 10 April 1989 , 4 ♂ ( PMSL). Same site, 5-12 July 1989 , 1 ♂ ( PMSL). Same site but 34.5 km, 98° 31’ E, 18° 31’ N, 1600 m , 4 ♂, 3 ♀ ( PMSL). Unknown Province, Tung Yaw , 18 km NW Ba Pa Pael, 98° 39’ E, 19° 08’ N, 1200 m, 17 April 1989 , 1 ♂, 1 ♀ ( PMSL). Vietnam: Lao Cai, tributary Muong Hoa Ho River , 15 km E Sapa, 926 m, 10 May 1995 , ROM 956033, D. Currie, B. Hubley, J. Swann, 2 ♂ ( ROM). Same site, 6 May 1995 , ROM 956013, D. Currie, B. Hubley, J. Swann, 1 ♂ ( IEBR). Additional material: Lao Cai, tributary Muong Hoa Ho River , 15 km E Sapa, 926 m, 11 May 1995 , ROM 956034, D. Currie, B.Hubley, J. Swann, 7 nymphs ( ROM).

Adult habitus. General color pale brown. Head mostly yellow brown with darker areas around antennal bases and forward of median ocellus ( Fig. 33 ). Femora pale but darker apically ( Fig. 38 ), tibiae brown but slightly darker at base and apex.

Male. Forewing length 22 mm. Hemitergal lobes short, wide, rounded apically and bearing a small basal callus armed with sensilla basiconica ( Figs. 34- 35 ); a short carina extends along dorsal edge of hemiterga. Tergum 9 with a median patch of sensilla basiconica but sensilla basiconica absent from tergum 8. Aedeagus membranous, cylindrical but strongly narrowed at apex. Armature consists of small to moderate size spines in ventral patch in apical half of sac; patch strongly narrowed on dorsum to an apical or subapical band ( Fig. 37 ).

Female. Forewing length 29 mm. Subgenital plate broadly triangular with an apical emargination or small truncate apex ( Fig. 36 ).

Egg. Outline almost spherical to slightly oval with short, narrow collar; rim of collar scalloped with irregular lumpy projections. Chorion finely punctate throughout; punctations vary slightly in diameter over most of surface but smaller ones occur generally below micropylar line. In equatorial third of egg punctations outline follicle cell impressions with ca. 3-4 pits per cell side; cells enclose simple floors with highly variable numbers of pits, usually clustered near cell centers ( Figs. 78-79 ).

Larva. Anal gills absent. Head and body distinctively patterned in yellow and dark brown pigment. Head dark with pale areas lateral to and between ocelli, along M-line and across anterior margin of frons ( Fig. 39 ); pronotum dark with scattered pale areas. On the abdominal terga, dark apical, basal and mesal bands connect to outline a pair of linear pale areas on each side of terga ( Fig. 40 ). Intercalary bristles absent from abdominal terga. Pronotum with setal fringe complete, but somewhat sparse laterally; setae at anterior corners conspicuously longer. Long silky setae occur along median line of body, across occiput and dorsally on cerci. Femora, tibiae and tarsi also bear outer fringe of long silky setae; femora armed above bare median band with prominent bristles, and below band with shorter thick bristles ( Fig. 41 ); tarsal claws with basal tooth. Inner lacinial margin with row of close-set, thick bristles which extend from base of subapical tooth for most of length of lacinia ( Fig. 42 ).

Etymology. The species name refers to the broadly rounded hemitergal tips.

Diagnosis. Kamimuria obtusa shares the short, broad hemitergal lobes and aedeagal armature pattern with K. klapaleki but can be distinguished by careful comparison of details in aedeagal armature. In K. obtusa the armature extends essentially to the aedeagal apex and the patch is continuous on the dorsum forward of the subapical bare spot ( Fig. 37 ), whereas in K. klapaleki the apical armature ends well before the tip and the dorsoapical patch is not continuous forward of the subapical bare spot ( Fig. 97 ). Chorionic features including the mesal field of obscure follicle cell impressions composed of rows of pits ( Fig. 78 ) permit recognition of gravid females and larvae were associated through dissection of the aedeagus and eggs from pharate specimens. Although few larvae are known in this genus, and color pattern may not ultimately prove to be a reliable method for species recognition, this species is distinct in head color pattern from K. tibialis ( Sivec et al. 1988) .

Figures

Figs. 33-38. Kamimuria obtusa adult structures. 33. Head and pronotum, 34. Male terminalia, 35. Male hemitergal lobe, lateral, 36. Female terminalia, 37. Aedeagus, lateral, 38. Femur.

Figs. 39-42. Kamimuria obtusa nymphal structures. 39. Head and pronotum, 40. Abdominal terga 8-10, 41. Foreleg, 42. Maxilla.

Figs. 78-79. SEM micrographs of eggs of K. obtusa. 78. Collar and chorionic detail, 79. Anterior pole.

Figs. 94-97. Kamimuria klapaleki adult structures. 94. Male terminalia. 95. Male left hemitergal lobe, dorsal. 96. Aedeagus, dorsal. 97. Aedeagus, lateral.