Macrogynoplax sp.

Zúñiga, Maria del Carmen & Stark, Bill P., 2007, The First Record Of Macrogynoplax Enderlein (Plecoptera: Perlidae) From The Colombian Amazonas, Illiesia 3 (11), pp. 102-103 : 102-103

Macrogynoplax sp. CO ‐ 1

( Figs. 1‐3 )

Material examined. Colombia: Caquetá, Amazonia, Parque National Natural Chiribiquete, Quebrada La Piscina , Cuenca Rio Mesay , Estacion Puerto Abeja , 0° 04’ 16” N, 72° 26’ 48” W, 310 m, light trap, December 2001, A. Currea‐ Dereser, 1 ♀ ( MEUV). Adult habitus. General color pale white in alcohol. Head and pronotum without distinctive dark areas except lappets of head pale brown. Eyes with large area of unpigmented ommatidia on inner margins ( Fig. 1 ). Wing membrane transparent, veins brown. Legs entirely pale, no dark apical band on femora .

Female. Forewing length 13 mm. Subgenital plate large and bulging mesally, posterior margin reaches beyond posterior margin of sternum 9; posterior margin almost truncate but with a small mesal notch; marginal area of plate hairless ( Fig. 3 ). Sternum 9 under plate bearing a pair of lightly sclerotized, hairy, bar‐ like structures. Sternum 10 with a large anterior membranous zone.

Egg. Outline oval, collar small and nipple like ( Fig. 2 ). Chorion smooth.

1 2 3

Comments. Two currently known Macrogynoplax species have a female subgenital plate which extends beyond the posterior margin of sternum 9. Macrogynoplax pulchra Ribeiro‐ Ferreira & Froehlich is known from the Brazilian Amazonas, Reserva Florestal Adolpho Ducke (Ribeiro‐ Ferreira & Froehlich 1999), whereas M. guyanensis Enderlein is known from Guyana ( Zwick 1973). Females of the latter species have a broadly rounded subgenital plate and appear to be distinct from this specimen, but females of the former species have a subgenital plate that is quite similar to this species (see Fig. 12 in Ribeiro‐ Ferreira & Froehlich 1999). In addition, because there are several species whose females are unknown, male specimens are needed to confirm the status of the Colombian population.

Figures

Figs. 1‐3. Macrogynoplax sp. CO‐1 structures. 1. Head and pronotum, 2. Egg, 3. Female terminalia.