Omilneura circumvittata, García, Alfonso N. & Aldrete, 2006

García, Alfonso N. & Aldrete, 2006, New genera of Psocoptera (Insecta), from Mexico, Belize and Ecuador (Psoquillidae, Ptiloneuridae, Lachesillidae), Zootaxa 1319, pp. 1-14 : 7-9

Omilneura circumvittata , n. sp. ( Figs. 19–27 )

Color. Ground color creamy white, with reddish­brown areas as described below. Compound eyes black, ocelli hyaline, close together, each with an ochre centripetal crescent. Head pattern ( Fig. 19 ); genae deep reddish brown. Maxillary palps and antennae pale brown. Thoracic pleura and tergal lobes of meso­ and metathorax reddish brown. Forelegs creamy white from coxae to femora, tibiae and tarsi pale brown. Middle legs pale brown throughout. Hind legs same as forelegs, except for distal brown spots on femora. Wings almost hyaline; forewing pterostigma with proximal and distal brown bands; a brown band running along wing margin from R4+5 to anterior end of areola postica; a brown band from mid Cu to wing margin, anterior to Cu2­ A1 junction. Hindwing almost hyaline; a pale brown band from R4+5 to M1, a pale brown spot between Cu and wing margin and on wing base. Abdomen creamy white, with transverse, ochre subcuticular rings. Genital segments reddish brown.

Morphology. Outer cusp of lacinial apex broad, with six denticles ( Fig. 20 ). Forewing pterostigma ( Fig. 22 ) elongate; R2+3 and R4+5 long, sinuous; M six branched, branch next areola postica simple in right wing, forked in left wing. Areola postica wide, high, with apex rounded. Hindwing M simple ( Fig. 22 ). Hypandrium ( Fig. 27 ) a large, central, setose sclerite, with a short, stout, posterior projection on each side, flanked by smaller, rhomboid sclerites. Phallosome complex ( Fig. 21 ), with lateral struts slender, V­shaped, each strut with an elongate, pigmented extension on inner edge; external parameres distally blunt, proximally with a short stem joining the lateral strut, and a long stem directed mesally; three pairs of phallosome sclerites: two central pairs, close to each other, curved, blunt on both ends, and an outer pair with each sclerite wide based, narrowing to end, acuminate; external parameres and phallosome sclerites in a membranous endophallus, anteriorly with two broad, irregular, pigmented areas. Paraprocts ( Fig. 26 ) robust, setose as illustrated, with sensory fields nearly round, each bearing 33 – 37 trichobothria issuing from basal rosettes. Epiproct ( Fig. 25 ) trapeziform, with five setae along posterior border, a central one and two close together on each side, at a distance, in a field of microspines; a field of setae on each side and a triangular group of three setae mesally, next to anterior border.

Measurements. FW: 5617, HW: 3714, F: 1318, T: 2244, t1: 956, t2: 136, t3: 186, ctt1: 29, Mx4: 292, f1: 999, f2: 838, f3: 756, IO: 535, D: 999, d: 680, IO/D: 1.37, PO: 0.68.

Material studied. Holotype M. MÉXICO. Guerrero. Chilpancingo. Omiltemi Natural Reserve, area “La Perra”, 17°33’42’’N: 99°41’29.9’’W, 2198m. 20.X.1998, on tree trunk, J. A. Casasola & T. Martínez. CNIN.

Etymology. The genus name is a composite word formed with the root of the type locality “Omiltemi” and the last two syllables of the genus name Loneura . The specific name refers to the pigmented band that runs along part of the margin of the forewing.

Remarks. The forewing of Omilneura immediately brings to mind the forewing of some species of Loneura , particularly L. crenata Navás , L. leonilae García Aldrete , L. mombachensis García Aldrete and L. ocotensis García Aldrete ; but it can not be placed in Loneura because M in the hindwing is simple. The hypandrium of Omilneura is reminiscent to those of two species of Triplocania and one species of Loneura ( T. brailovskyana García Aldrete , T. vazquezae García Aldrete and L. splendida Mockford ), genera that belong in different clades within Ptiloneuridae ( Casasola González 2006, García Aldrete 2005). The phallosome of Omilneura is unique in the family in that the external parameres are slender, blunt ended and with two anterior stems, a short outer one that joins the lateral strut and a long, inner one directed inward.

Two clades are recognized in the Ptiloneuridae , one, including Belicania , Perucania and Triplocania is supported by the character state “Male hypandrium…a central sclerite, with posterior projections, flanked by small sclerites”. The other clade, including Ptiloneuropsis , Ptiloneura , Loneura , Willreevesia , Loneuroides , Timnewia and Euplocania , is supported by the character state “FW M…5 – 8 branched” ( Casasola González 2006, García Aldrete 2005). Thus Omilneura presents characters of the two clades, although the supporting character of the first clade also appears in the second, supporting the pair Ptiloneura­Loneura. On wing venation characters, Omilneura is related to Willreevesia , with which it shares having vein M of the hindwing simple, but differs from it in the number of branches of vein M of the forewing and in the genital characters indicated above.

Figures

FIGURES 19 – 27. Omilneura circumvittata n. sp. M. 19. Front view of head. 20. Lacinial apex. 21. Phallosome. 22. Fore­ and hind wings. 23. Labrum. 24. Distal inner labral sensilla. 25. Epiproct and left paraproct. 27. Hypandrium. Scales in mm.