Macrogynoplax matogrossensis, Bispo, Pitágoras C., Neves, Cláudio O. & Froehlich, Claudio G., 2005

Bispo, Pitágoras C., Neves, Cláudio O. & Froehlich, Claudio G., 2005, Two new species of Perlidae (Plecoptera) from Mato Grosso State, western Brazil, Zootaxa 795, pp. 1-6 : 4-5

Macrogynoplax matogrossensis sp.n. Bispo & Neves ( Figs. 8–14 )

Material. Holotype: BRAZIL, Mato Grosso, Jaciara , Córrego Tenente Amaral, 1 male ( CERMT # 2), 27.XI.1999. Paratypes: Same locality, 1 female, 1.IX.1999; 2 females, 22.XI.1999; 1 male, 1 female, 3.XI.1999; 3 males, 1 female, 13.XI.1999; 1 female, 27.XI.1999; 1 female, 2.III.2000.

Description. General color pale yellowish in alcohol, possibly greenish in life. Eyes with unpigmented mesal area ( Fig. 8 ). Wings pale, in a few specimens darker area at anastomosis and CuA.

Male. Forewing length, 13–14 mm. Hammer rounded, with horizontal orientation ( Fig. 9 ). Tergum 10 with normal pilosity. Penial armature tubular, open ventrally to near apex, ending in a membranous and arched structure; apex membranous, globose; hooks absent; ( Figs. 10–12 ). Paraprocts with large subapical denticle.

Female. Forewing length, 13.5–16 mm. Subgenital plate elongate, covering part of sternum 10 and with a small distal emargination ( Fig. 13 ). Egg oval, 0.37 x 0.22mm ( Fig.14 ).

Remarks. This is the first named species for west­central Brazil and the first for the State of Mato Grosso. Some nymphs and a female adult, unnamed, were collected in the State of Goiás ( Bispo et al. 2002). The present species is similar to M. pulchra Ribeiro­ Ferreira & Froehlich 1999, from Manaus, Amazonas state, but is larger, as the forewing length of males of M. pulchra varies from 10.5 to 12 mm (personal communication, J.M.F. Ribeiro). Besides, the penial armature of M. pulchra lacks the ventrally distal arched structure, and the distal membranous part narrows apically, forming a cone. The large subapical denticle of M. matogrossensis is similar to that ilustrated for M. pulchra (Froehlich, 2002) .

Etymology. Belonging to Mato Grosso, Brazilian state where the species was collected.

Figures

FIGURES 8 – 12. Macrogynoplax matogrossensis sp. n. male. Fig. 8, head and pronotum; Fig. 9, sternum 9; Fig. 10, penial armature lateral view; Fig 11, ventral view; Fig. 12, dorsal view. Scales: 0.5 mm.

FIGURES 13 – 14. Macrogynoplax matogrossensis sp. n. female. Fig. 13, sternum 8 and 9; Fig. 14, eggs. Scales: 0.5 mm.