Hemacroneuria marginalis, Stark & Sivec, 2008

Stark, Bill P. & Sivec, Ignac, 2008, Systematic Notes On Kiotina Klapálek And Hemacroneuria Enderlein (Plecoptera: Perlidae), With Description Of Four New Species, Illiesia 4 (17), pp. 161-175 : 172-174

Hemacroneuria marginalis sp. n.

( Figs. 41–50 )

Material examined. Holotype ♂ from Vietnam, Lao Cai Province, Sapa, large waterfall on road from Sapa to Lai Chau, 8 May 1995, D. Currie, B. Hubley, J. Swann, ROM 956022 ( ROM) . Paratypes: Vietnam: Lao Cai Province, Sapa, small stream crossing road from Quy Ho to Ta Grang Phinh , 9 May 1995, D. Currie, B. Hubley, J. Swann, ROM 956023, 1 ♀ (pinned, ROM) . Lao Cai Province, ca. 12 km on road from Sapa to Lai Chau, 1950 m, 28 April-12 May 1999, 22 ° 20’ 58.3” N, 103 ° 46’ 15.7” E, B. Hubley, ROM 992001, 1 ♂ (pinned, aberrant paraprocts, ROM) . Same site, 1-12 May 1999, B. Hubley, ROM 992011, 1 larva ( ROM) . Lao Cai Province, Sapa, Fan Si Pang Mountain , 1600 m, 22-29 April 1995, LF, 1 ♂ ( ZMH) .

Adult habitus. Triocellate, ocelli small and anterior ocellus minute. General color dark brown to black patterned with pale yellow. Central occiput and frons dark brown from ocelli to M-line; forward of M-line a dark tongue shaped median patch extends to clypeus ( Fig. 41 ). Pronotum dark brown on disk but slightly paler along median suture and pale along lateral margins. Legs dark brown, wing membrane dark brown except costal area pale from base to cord.

Male. Forewing length 18 mm. Paraprocts thick, triangular in outline and densely hairy on posterior surface ( Fig. 42 ). Tergum 10 with a pair of low lateral knobs and conspicuous sensilla basiconica patch

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45 44 46

divided by membranous band ( Fig. 43 ). Hammer wide along anterior margin and narrowed posteriorly giving a more or less rounded triangular shape ( Fig. 44 ). Aedeagus not completely everted, but surface armed with apical patch of very fine setal spines giving a brown cast to structure; median and basal areas armed with microtrichia.

Female. Forewing length 17 mm. Subgenital plate lateral margins subparallel to about midlength but angled posteriorly in distal half ( Fig. 46 ). Posterior margin with shallow median notch. Vagina very slender, completely membranous and without obvious armature; spermatheca an inflated bag attached to dorsal vaginal surface by a narrow stalk and bearing several accessory glands ( Fig. 45 ).

Larva. Triocellate. Body length about 17 mm. General color pale yellow-brown without obvious pattern.Post occipital fringe includes several long bristles ( Fig. 47 ). Pronotum completely fringed with bristles along lateral margins. Legs with sparse dorsal fringes on femora and tibiae but rather heavily armed with stout setae ( Fig. 48 ). Lacinia bidentate with inner tooth about 2/3 length of outer tooth; inner margins completely lined with primary and secondary setae and ventral surface with a sparse median patch of fine setae ( Fig. 49 ). Mandible with five teeth and bearing a submarginal row of short, thick setae and a marginal row of thick bristles followed by a more basal tuft of fine setae; basoventral area of mandible bearing a cluster of thick bristles near outer margin ( Fig. 50 ). Well developed anal gills present; additional gills include SC 1 (double), AT 2, SC 2 (double), AT 3, SC 3 (double), PT 3.

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Etymology. The species name refers to the pale marginal bands along the lateral margins of the adult pronotum.

Diagnosis. This species is distinguished from H. violacea on the basis of the extensive pale areas on the head and laterally on the pronotum. In addition, tergum 10 of this species bears a conspicuous patch of sensilla basiconica which are absent in H. violacea , and the paraprocts are longer, narrower and more apically blunt than in that species. The hammer of this species is also slightly larger than in H. violacea .

Figures

Figs. 41-46. Hemacroneuria marginalis structures. 41. Head and pronotum, 42.Male paraproct, caudal aspect, 43. Male terminalia, dorsal, 44. Male sternum 9, 45. Vagina, dorsal aspect, 46. Female terminalia, ventral.

Figs.47-50.Hemacroneuriamarginalisnymphalstructures.47.Headandpronotum,48.Foreleg,49.Maxilla,50.Mandible.