Kempnyia gracilenta (Enderlein)

Silva, Fernanda Avelino-Capistrano da, Barbosa, Leandro Silva & Almeida, Gisele Luziane de, 2011, Complementary Descriptions Of Kempnyia Gracilenta (Enderlein 1909) And Kempnyia Reticulata (Klapálek 1916) (Plecoptera: Perlidae), Illiesia 7 (14), pp. 142-147 : 143-144

Kempnyia gracilenta (Enderlein)

( Figs. 1-3 )

Acroneuria gracilenta Enderlein 1909:397 .

Acroneuria gracilenta: Klap á lek, 1916:47 .

Acroneuria gracilenta: Claassen, 1940:182 .

Eutactophlebia gracilenta: Jewett, 1960:175 . ( Figs. 6, 6b )

Eutactophlebia gracilenta: Zwick, 1973:490 . (Figs. 35-39)

Kempnyia gracilenta: Froehlich, 1979:70-71 .

Kempnyia gracilenta: Zwick, 1983:179 .

Kempnyia gracilenta: Froehlich, 1984a:1137-1138 . ( Figs. 1-3 )

Material Examined. Brazil, Espírito Santo, Santa Teresa, Córrego Sagüi , 19°58’00.5”S 40°32’09”W , 05.vii.2008, 1♂, 3♀, 21 larvae; 03.iv.2009, 9 larvae; 25.vi.2009, 21 larvae; Córrego Tapinuã , 19°58’16.5”S 40°31’80.1”W , 04.vii.2008, 7 larvae; 04.iv.2009, 2 larvae; 26.vi.2009, 1♀, 5 larvae; Córrego do Banhado , 19°57’55.1”S 40°32’15.4”W , 04.ii.2009, 2 larvae; 04.iv.2009, 13 larvae; 26.vi.2009, 4 larvae; Córrego da Divisa , 19°58’06.3”S 40°31’28.9W , 02.vii.2008, 1♂ 2♀, 21 larvae; 14.ix.2008, 2 larvae; 10.xi.2008, 23 larvae; 03.ii.2009, 10 larvae; 04.iv.2009, 30 larvae; 26.vi.2009, 51 larvae; 21.vii.2009, 1♂; 21.viii.2009, 1♀. Córrego Bonito , 19°58’28,4”S 40°31’54.4”W , 03.vii.2008, 14 larvae; 14.ix.2008, 20 larvae; 05.ii.2009, 29 larvae; 05.iv.2009, 40 larvae; 25.vi.2009, 48 larvae; 20.viii.2009, 1♂; 12.ix.2009, 1♂.

Larva. General color light reddish brown. Head dark posteriorly, becoming paler in a broad transverse band forward of median ocellus; clypeus dark brown, M-line distinct in transverse pale band. Ocelli black; eyes black with a white band in the base. Antennae with a uniform yellowish-brown pattern. Pronotum brown with clear spots forming a characteristic pattern and with a pale median band; rugosities indistinct. Maxillary lacinia yellowish-brown, with the teeth sharp-pointed and red-brown. Mandible yellowish, with five sharp-pointed dark brown teeth. Glossae, paraglossae and labial palps pale yellow. Legs with a fringe of fine setae along the outer margin from trocanter to tarsi. Abdomen dark brown in the mature nymphs; apex of the abdominal segments with a fringe of bristles. Cerci dark brown at the base and paler to the apex.

Measurements. Larval Head: 2.9 x 2.2mm; Pronotum: 3.38 x 1.79mm; Abdomen: 4.3mm; total length: 10.59mm (n = 379).

Remarks. Larvae of K. gracilenta are distinguished from known members of the genus on the basis of the pale transverse band which extends between the compound eyes, covering part of the ocellar triangle and obscuring the M-line ( Fig. 1 ). The marginal lacinial bristles include a few (ca. 3-4) longer ones at the base of the second tooth and a row of shorter ones extending to the lacinial base ( Fig. 2 ). The latter character distinguishes larvae of this species from those of K. tijucana Dorvillé & Froehlich ( Dorvillé & Froehlich 2001) and K. reticulata (see Fig. 8 ), whereas the smaller size and shape of the epicranial suture distinguishes K. gracilenta larvae from those of the much larger larvae of K. neotropica (Jacobson & Bianchi) ( Bispo & Froehlich 2008) .

Distribution. Brazil: São Paulo; Rio de Janeiro; Minas Gerais; Espírito Santo.

Figures

Figs. 1-3. Kempnyia gracilenta larva. 1. Head and pronotum, dorsal. 2. Maxilla, dorsal. 3. Mandible, dorsal.

Figs. 4-9. Kempnyia reticulata. 4-6. female. 4. Head and pronotum, dorsal. 5. Sterna 7-10, lateral view. 6. Subgenital plate, ventral. 7-8-9. larva. 7. Head and pronotum. 8. Left maxilla. 9. Left mandible.