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http://zoobank.org/urn:lsid:zoobank.org:pub:10B8FFE3-2F2A-4AF6-BFCB-93A00B5DEF7B
Introduction
The species group L. texcocana of the genus Lachesilla Westwood was diagnosed by García-Aldrete (1985). An additional species, endemic to the Sierra Juárez in Oaxaca, Mexico, was included 31 years later (García-Aldrete, 2016). It presently includes 10 species, that occur from the states of New Mexico and Nevada in the USA, south to Guatemala, as follows: USA (1 sp.), Mexico (8 spp.) and Guatemala (4 spp.). Five species are endemic to Mexico, 2 are endemic to Guatemala, 1 is shared with the USA, and 2 are shared with Guatemala. In Mexico, 2 species have been recorded from Chiapas: L. monticola García-Aldrete, from 15 and 20 km W of San Cristóbal de las Casas, and L. texcocana García-Aldrete, from 20 km W of San Cristóbal de las Casas (García-Aldrete, 1985).
In 1993, one female of the Lachesilla texcocana species, representing an undescribed species, was found in the Biosphere Reserve El Triunfo (15º09’10”-15º57’02” N, 92º34’04”-93º12’42” W). The purpose of this paper is to describe and illustrate the species and show its affinities to the other species in the group.
Materials and methods
The only female available for study was dissected in 80% ethanol, and its parts (head, right wings and legs, and genitalia were mounted on one slide in Canada balsam. Color was recorded by observing the whole specimen, previous to the dissection, in 80% ethanol, under a dissecting microscope, illuminated with cold white light at 50X. Parts on the slides were measured with a filar micrometer mounted on the microscope. The measurements are given in mm. Abbreviations of parts measured are as follow: FW and HW: lengths of right fore- and hind- wings, F, T, t1, t2: lengths of femur, tibia, and tarsomeres 1 and 2 of right hindleg, ctt1: number of ctenidobothria on t1, Mx4: length of fourth palpomere of right maxillary palpus, f1… fn: lengths of flagellomeres 1…n of right antenna, IO, D and d respectively: minimum distance between compound eyes, antero-posterior diameter and transverse diameter of right compound eye, in dorsal view of head, PO: d/D. The specimen studied is deposited in the National Insect Collection (CNIN, Departamento de Zoología, Instituto de Biología, Universidad Nacional Autónoma de México, Mexico City).
Description
Lachesilla gammaoides García-Aldrete n. sp. Female (Figs. 1-5)
Figures 1-5 Lachesilla gammaoides n. sp. Female. 1, Forewing; 2, hindwing; 3, subgenital plate; 4, epiproct and left paraproct; 5, gonapophyses, ninth sternum and spermapore. Scales in mm. Figures 3 and 5 to common scale.
http://zoobank.org/urn:lsid:zoobank.org:act:1DCC272B-7B25-40D1-85D9-6CC97DE13A69
Diagnosis. Close to L. gamma García-Aldrete, recorded in the Mexican sates of Guerrero, Mexico, Michoacán, Morelos, Puebla and Veracruz, differing from it by having the pigmented area underlying the subgenital plate much shorter, with small, slender antero-lateral processes.
Taxonomic summary
Holotype. Female. Color (in 80% ethanol). Body tawny brown. Compound eyes black, ocelli hyaline, with ochre centripetal crescents. Maxillary palps, antennae and legs pale brown. Wings almost hyaline, with a light orange hue. Veins pale brown. Tergal lobes of meso- and metathorax slightly more pigmented. Abdomen whitish, with dark brown subcuticular bands, faded ventrally. Morphology. Compound eyes below the level of the straight vertex. Forewing pterostigma elongate, wider posteriorly. Rs-M diverging from a point. Areola postica wide, broadly triangular (Fig. 1). Hindwing (Fig. 2). Subgenital plate broad, setose, posteriorly rounded; underlying pigmented area broad, short (Fig. 3). Gonapophyses (Fig. 5) long, with setae as illustrated, sides parallel, slightly pointed distally, outer border sclerotized, the sclerotized bands extended proximally into the membranous ninth sternum, this with the rimmed spermapore located toward the anterior border. Paraprocts (Fig. 4) large, broadly elliptic, setae as illustrated, sensory fields elliptic, with 11 trichobothria issuing from basal rosettes, and one marginal trichobothrium without basal rosette. Epiproct (Fig. 4) trapeziform, with setal field on distal half. Measurements. FW: 2583, HW: 1982, F: 494, T: 900, t1: 316, t2: 110, ctt1: 17, Mx4: 137, f1: 274, f2: 227, f3: 204, f4: 144. F5: 104, IO: 336, D: 200, d: 133, IO/d: 2.52, PO: 0.66.
Type material. Holotype female. Mexico. Chiapas. El Triunfo Biosphere Reserve. 1,800 m. Trail to Palo Gordo. 6-V-1993. Beating branches. A. N. García-Aldrete.
Etymology. The specific epithet refers to the similarity of this species with L. gamma García-Aldrete.
Discussion
Within the L. texcocana species group, L. gammaoides belongs in a species group assemblage that includes L. delta García-Aldrete, L. gamma García-Aldrete, L. mathieui García-Aldrete, L. monticola García-Aldrete and L. texcocana García-Aldrete, that share having similar underlying pigmented areas of the subgenital plates and similar gonapophyses. It differs from them in having the underlying pigmented area of the subgenital plate decidedly shorter, with the antero-lateral corners slightly projected.
Lachesilla gammaoides is endemic to the state of Chiapas, raising to 11 the number of species in species group L. texcocana, it constitutes the third species of that group recorded in Chiapas. The finding of the male will be important to clarify the affinities indicated above, based on female characters.
