Tominemoura trilari, Sivec & Stark, 2009

Sivec, Ignac & Stark, Bill P., 2009, Tominemoura, A New Stonefly Genus From Sabah, East Malaysia (Plecoptera: Nemouridae), Illiesia 5 (20), pp. 199-203 : 202-203

Tominemoura trilari , sp. n.

( Figs. 1-15 )

Material examined. Types. Holotype ♂ and 1♂ paratype from Malaysia, Sabah, Mt. Kinabalu, 3200 m, Gunting Lagadan , 1 July 1996, T. Trilar ( PMSL). Additional paratype: Malaysia, Sabah, Sayat-Sayat Hut, Mt. Kinabalu , 3850 m, 30 June 1996, T. Trilar, 1♂ ( PMSL). Other material: Malaysia, Sabah, Kinabalu National Park, Laban Rata , 3280 m, 15-16 April 1999, I. Sivec, 59 larvae including 2 pharate females and 1 pharate male .

Adult habitus. See generic description above.

Male. Forewing length 7-8 mm. Epiproct largely membranous dorsolaterally but with minute scale-like spines imbedded in membrane ( Figs. 2-3 ); sclerites well developed around base and as a narrow pair of straps between bulbous epiproct dorsal sclerites, extending from midlength, and downturned around epiproct apex. Venter of epiproct armed with a patch of stout backward directed spines, visible in lateral aspect ( Fig. 3 ). Paraprocts relatively bare but outer paraproct lobe appearing stout, curved forward and armed with a patch of short, stout spines on outer surface near apex ( Figs. 2-4 , 7).

Female. Known from pharate larvae. See generic description above.

Larva. Preemergent body length 7-10 mm. General color pale brown. Gills ( Fig. 6 ) bracket cervical sclerite, three outer rami arising from a common short trunk, inner gill furcation near base of trunk; lacinial structures as described above ( Figs. 13-14 ). Pronotal setal fringe as shown in Fig. 9 ; antennal setal pattern as shown in Fig. 10 . Abdominal terga with sparse posterior marginal bristle row; intercalary surface with sparse patches of short bristles ( Fig. 11 ). Cercal segments armed with apical whorls of bristles ( Fig. 12 ); longest bristles in whorls generally one third to half as long as next segment; long apical segments with additional short fine bristles near midlength of segments. Fine fringe setae absent from legs and cerci.

Etymology. The patronym honors our colleague Dr. Tomi Trilar, collector of the type series.

Diagnosis. See generic diagnosis above.

Comments. The larval specimens, collected from the same stream and general elevation and only a short distance from the two sites where adult males were collected on Mt. Kinabalu, share the same unusual gill structure and very likely represent the same species as the male specimens. Fig. 15 shows the female terminalia prepared from pharate larval specimens which are not fully expanded.

Figures

Figs. 1-6. Tominemoura trilari structures. 1. Adult head and pronotum, 2. Male genitalia, dorsal, 3. Male genitalia, lateral, 4. Male genitalia, ventral, 5. Epiproct, lateral. 6. Larval gills showing three outer rami (above) and two inner rami (below), 7. Male paraproct, oblique lateral aspect.

Figs. 8-12. Tominemoura trilari larval structures. 8. Habitus, 9. Margin of pronotum, 10. Antennal segments, 11. Abdominal tergum, 12. Cercal Segments.

Figs. 13-14. Tominemoura trilari SEM micrographs of larval mouthparts. 13. Lacinia, 14. Apex of lacinia.

Fig. 15. Tominemoura trilari female terminalia prepared from pharate larval specimen.