Anacroneuria otun, Zúñiga & Stark & Cardona & Tamaris-Turizo & Ortega, 2007

Zúñiga, Maria del Carmen, Stark, Bill P., Cardona, William, Tamaris-Turizo, César & Ortega, Oscar E., 2007, Additions To The Colombian Anacroneuria Fauna (Plecoptera: Perlidae) With Descriptions Of Seven New Species, Illiesia 3 (13), pp. 127-149 : 129

Anacroneuria otun sp. nov., Stark & Zúñiga

( Figs. 6-10 )

Material examined. Holotype ♂ and 3♂ paratypes from COLOMBIA, Risaralda, Municipio de Pereira, Parque Nacional Natural Los Nevados, El Jordán , Río Otún headwater basin , 3100 m, N 04 ° 42 ′ 32 ″, W 75 ° 29 ′ 37 ″, 27-28 June 2006, light trap, M. del C. Zúñiga, W. Cardona, G. Zabala, Cardozo- Zúñiga (Holotype and 2 paratypes: MEUV, paratype: BPS).

Adult habitus. General color dark brown patterned with yellow. Head covered mostly with dark brown but M-line with three prominent pale areas; occiput dusky brown except for pale post- ocellar area. Pronotum brown with narrow median pale band and scattered dark rugosities ( Fig. 6 ). Wing membrane transparent, veins dark brown. Legs brown, tibia darker than femora, except narrow, dark, apical femoral band.

Male. Forewing length 18 mm. Hammer cylindrical, height greater than diameter ( Fig. 7 ). Aedeagal apex short, slightly longer than wide, and rounded; venter with a pair of small membranous lobes, shoulders broad ( Fig 8 ). Dorsal keel steep, composed of a pair of narrow ridges which end slightly beyond mid length of apical area ( Fig. 10 ). Membranous areas dorsad and basal to hooks bulging. Lateral aspect of apex about as wide as long ( Fig 9 ).

Female. Unknown.

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, is based on Río Otún, the type locality.

Diagnosis. The aedeagus of this species is most similar to that of A. cajas Zúñiga & Vimos , a recently described Ecuadorian species ( Zúñiga et al. 2006). The aedeagal apex of A. cajas is more pointed and the dorsal keel is significantly weaker than in A. otun . In addition, the pronotum of A. cajas has dark pigment adjacent to the median suture, whereas in A. otun a narrow, median pale band occurs.

Ecological notes. The type locality is in the headwaters of Rio Otún in the highest mountains of the Cordillera Central and is part of Región Natural Andina de Colombia. This small second order stream is about 8 m wide and 0.4-0.5 m deep, with a mixed substrate composed of boulders, stones, patches of gravel and sands, and riffle zones primarily. The water quality is in optimum environmental condition, the temperature was 10°C and the air, 12°C at the time of collection. Natural riparian vegetation is present, the zone receives 1900 mm mean annual rainfall and is covered by a very humid montane forest, in accordance with Holdridge life zones system ( Espinal & Montenegro 1963). These specimens were collected during the dry season.

Figures

Figs. 6-10. Anacroneuria otun. 6. Head and pronotum, 7. Male sternum 9, 8. Aedeagus, ventral, 9. Aedeagus, lateral, 10. Aedeagus, dorsal.