Rueckeria skelleyi, Arriaga-Varela, Emmanuel, Tomaszewska, Wioletta, Huo, Lizhi & Seidel, Matthias, 2018

Arriaga-Varela, Emmanuel, Tomaszewska, Wioletta, Huo, Lizhi & Seidel, Matthias, 2018, On Neotropical Merophysiinae with descriptions of a new genus and new species (Coleoptera, Endomychidae), ZooKeys 736, pp. 1-41 : 22-26

Rueckeria skelleyi sp. n. Figs 12, 13c, d, 20

Etymology.

The name of the new species is dedicated to our colleague Dr. Paul Skelley, the curator of the entomology collection in FSCA, where the holotype of this species was found during a visit of EA-V and WT in this collection.

Differential diagnosis.

Rueckeria skelleyi is similar to R. inecol and R. ocelotl spp. n, by the body completely brown and the abdominal ventrite 1 with irregularly rounded postcoxal lines. However it can be distinguished by the basal lateral pores not perforated as in the other species (Fig. 20c), mentum subrectangular and pronotal lateral margins smooth (Fig. 20c) (mentum subhexagonal and pronotal margins weakly crenulate in R. ocelotl ), and by the features of the aedeagus (Fig. 12 d–f): tegmen markedly longer than the median lobe which is widened at base and provided with an additional acute process ventrally.

Description.

Length 1.50 mm, width 0.64 mm, height 0.43 mm; body elongate-oval, weakly convex, 2.35 times as long as wide, 3.32-3.50 times as long as high (Figs 12 a–c, 13c, d). Surfaces shiny, sparsely covered by short, decumbent golden setae. Color reddish brown with yellowish brown antennae and legs.

Head with interocular distance 0.80 times as wide as the head including eyes. Eyes small, composed of approximately 16 facets. Antenna moderately long and slender, 0.75 times as long as the head and pronotum combined; scape 1.20 times as long as wide, 1.16 times as long as pedicel; pedicel 1.5 times longer than wide; third antennomere 1.8 times as long as wide, 0.83 times as long as pedicel; antennomeres 4-7, 1.4 times as long as wide and 0.5 times as long as pedicel; antennomeres 8-9 as long as wide, 0.7 times as long as pedicel; terminal antennomere inflated, asymmetrical, 3.0 times longer at longer margin than pedicel, longer margin 1.32 times longer than lateral one, apical margin truncate. Mentum subquadrate, very weakly produced anteriorly in middle of anterior margin (Fig. 20a).

Pronotum weakly transverse (Fig. 20a), 0.76 times as long as wide, 1.4 times as wide as head, 1.07 times wider at widest part than at base, widest at anterior fourth, rather convex at mid length; front angles rounded, weakly produced, margins slightly sinuate, narrowing at basal third; margins narrowly bordered, weakly crenulate; hind angles right-angled (Fig. 20c), rounded at tips. Anterior half of disc without impressions. Longitudinal sulci weakly convergent, almost reaching apical 2/5; basal lateral pores not perforated (Fig. 20c), just present as shallow depressions conected by moderately deep, faintly defined transversal sulcus, posterior transverse sulcus shallow provided with large foveate punctures; area between transverse sulci convex. Prosternal process moderately widely separates front coxae, weakly widening posteriad, its apical width 0.75 times the length of procoxae (Fig. 20d).

Elytra 0.85 mm long, 1.40 times as long as wide; 2.43 times as long and 1.34 times as wide as pronotum; widest at basal fourth then continuously strongly converging to rounded apex. Punctation composed of small setiferous punctures and dispersed, slightly larger, shallow foveate punctures.

Legs moderately long. Femora very narrow at base, then strongly widened at apical half. Tibiae moderately narrow, continuously widening to apex. Metatibia very narrow, straight, continuously widening apically, 0.31-0.36 times as long as elytra; metatarsus very long, 0.66 times as long as metatibia.

Abdomen with ventrite 1 slightly shorter than metaventrite and almost as long as three following ventrites combined; postcoxal lines on ventrite 1 reaching about half length of ventrite, irregularly rounded. Ventrite 5 arcuate apically.

Male genital segment with sternite rounded apically, basal margin acuminately rounded. Tegmen large, distinctly longer than median lobe, parallel sided, weakly curved in lateral view, apex rounded; tegminal strut indistinct. Median lobe widened and with additional acute ventral process near base, then strongly narrowing to markedly acute apex (Fig. 12 d–f).

Female unknown.

Type material.

Holotype, male, MEXICO, "MEXICO: Querétaro; Mpio: San Joaquin, Campo Alegre, 20°54'47"N, 99°34'35"W, 8-15-DEC-2013, 2480 m, P. Skelley, P. Kovarik, R. Jones, surface dung pitfall" (FSCA).

Distribution.

Mexico: Querétaro (Fig. 21).