Togoperla condyla Li & DeWalt

Li, Weihai & Dewalt, Edward, 2012, A new species of Togoperla (Plecoptera: Perlidae) from China with a revised key to Togoperla males, Zootaxa 3564, pp. 54-60 : 54-59

Togoperla condyla Li & DeWalt , sp. nov.

( Figs. 1–10 )

Diagnosis. Males of this species are distinguished by a dark brown pronotum, a pale area around the compound eyes that extends anterolaterally, and by legs with yellow and black or brown bands. Additionally, the apical half of the aedeagal sac is greatly enlarged and the armature on the dorsal surface of basal tube covers most of the swollen apex.

Male. Forewing length 20.2–20.8 mm, hindwing length 18.0– 18.4 mm. General color brown to dark brown in dorsal view, yellow to brown in ventral surface. Head mostly dark brown except pale area around compound eyes and anterolateral margins of the head. Compound eyes dark; antennae brown but scape darker. Pronotum dark brown with vague rugosities, posterior corners rounded ( Figs. 1–2 ); wings brown, costal area pale yellow, veins brown; legs banded with dark brown at the base and apex of both femora and tibiae, a wide, yellow band separating dark bands ( Fig. 3 ). Abdomen brownish.

Terminalia . Tergum 5 produced into an emarginate lobe with posterior sensilla basiconica ( Figs. 4 and 6 ). Terga 6-9 with brown medial area covered by patches of long setae, the setae of tergum 9 only present on anterior 1/4. Hemiterga of tergum 10 almost parallel-sided in dorsal view, apex slightly narrowed apically in lateral view, lobe about 2.5X as long as basal callus in dorsal view, basal callus and hemitergal tips bearing sensilla basiconia ( Figs. 4–7 ). Aedeagal tube basally with a typical dorsal lobe, and a pair of finger-like dorsolateral lobes armed with tiny spines; sac with basal half tubular and apical half greatly enlarged, armature present on dorsal surface of basal tube of sac and covering most of the swelling apex, tip bearing two membranous lateral lobes with no armature ( Fig. 8 ).

Female. Unknown.

Type Material. Holotype: male ( HIST – PLEt001 ), China: Zhejiang Province, Lin’an County, Mt. Tianmushan , Dongpu stream, 119.5208 E, 30.3622 N, 2011. V.14, Weihai Li. Paratype: male ( HIST – PLEt002 ), Guangxi Province, Jinxiu County, Mt. Dayaoshan, Fenzhan village , unnamed tributary of Changtan River, 110.1897 E, 24.1363 N, 2012.IV.8, Weihai Li.

Etymology. The specific epithet refers to the enlarged apex of the aedeagal sac.

Distribution. China (Zhejiang, Guangxi).

Remarks. The new species keys to T. perpicta Klapálek, 1921 in Stark and Sivec (2008), but it differs in having an entirely dark brown pronotum with a wider posterior portion in contrast to the yellow brown median band and narrower posterior portion in T. perpicta . It differs also in the fully extruded aedeagal sac that has a greatly enlarged, fist-shaped tip with an apical accessory lobe. In T. perpicta the sac bears a pair of naked accessory lobes dorsally and terminates in a long lobe with fine hairs apically ( Stark and Sivec 2008). The holotype was collected with a single male of T. perpicta that allows us to directly compare the two species. Togoperla condyla was collected using a sweep net along two shallow, 2–3 m wide streams with pebbles and boulders substrate ( Fig. 11 ).

Given that the known range of the genus is limited to temperate southern China, Japan, Thailand, and Vietnam, the new species will likely be confined to this region. We present a revised key to the males including the new species and the species described subsequently to Stark & Sivec (2008) by Cao & Bae (2010).

Figures

FIGURE 11. Type locality.

FIGURES 1 – 5. Togoperla condyla sp. nov., male. 1. Head and pronotum, dorsal view. 2. Head and thorax, ventral view. 3. Leg pattern, lateral view. 4. Terminalia, dorsal view. 5. Hemiterga showing details of basal callus, dorsal view.

FIGURES 6 – 7. Togoperla condyla sp. nov., male. 6. Terminalia, lateral view. 7. Hemiterga and terga 8 & 9, lateral view.

FIGURES 8 – 10. Togoperla condyla sp. nov., male. 8. Aedeagus, lateral view. 9. Basal callus, dorsal view. 10. Hemiterga, lateral view.