Acrotrichis cornuta, Darby, Michael, 2015

Darby, Michael, 2015, Studies of Bolivian Ptiliidae (Coleoptera) 2: The subfamily Acrotrichinae including two new genera Petrotrichis and Microtrichis, and eight new species of Acrotrichis, Zootaxa 3999 (2), pp. 190-210 : 194-195

Acrotrichis cornuta sp. n.

( Figs. 4A –J)

Habitus Fig. 4A . Length 0.74 mm. Colour dark brown, antennae and legs dusky yellow. Antennomeres 3–11 0.30 mm long, Fig. 4 C. Mentum and submentum chaetotaxy Fig. 4 I. Width across eyes 0.28 mm. Pronotum 0.43 mm wide, 0.48 mm long, sides with a slight insinuation before the hind angle when viewed at 45°, Fig. 4 B. Elytra 0.47 mm long, 0.48 mm wide. Mesoventrum Fig. 5 F. Posterior margin of metaventrum and metacoxal plates Fig. 4 G. Pygidium Fig. 4 J, with setae on anterior border and without long setae as Fig. 2 F.

Male: aedeagus Fig. 4 E; ventrite 6 Fig. 4 H.

Female: spermatheca Fig. 4 D.

Etymology. From the Latin cornutus meaning horned and referring to the horn-like setae at the sides of the male ventrite 7.

Diagnosis. The breadth of the elytra and form of the genitalia together with the male ventrite 7 setae will distinguish this species. The closeness of the metacoxae resembles members of the genus Storichrica Johnson, but other features such as the shape of the mentum and the more rounded pronotum and elytra quickly separate it.

Type data: Holotype: ♀, GPS35, BOL/ Nov. 2013/10, Bolivia 2013, Santa Cruz dep., W. Amboro NP, Barientos, 1806m, 29.xi, S. 18°05'55" E.63°48'04", sifting rotten wood, Winkler app. extr., P.Baňař lgt. (UASC).

Paratypes: 1♂ 1♀, same data as holotype (UASC/MMBC); 1♀, GPS38, BOL/ Nov. 2013/13, Bolivia 2013, Santa Cruz dep., W. Amboro NP, Barientos, 1883m, 29.xi, S. 18°06'11" E.63°48'09", sifting litter, palms, Winkler app. extr., P.Baňař lgt. (BMNH).

Figures

FIGURE 4. A. cornuta. A, habitus; B, side of pronotum viewed at 45 °; C, antennomeres 3 – 11; D, spermatheca; E, aedeagus; F, mesoventrum x 580; G, metaventral posterior margin and coxal plates x 635; H, male ventrites six and seven x 1820; I, mentum and submentum x 1220; J, pygidium.

FIGURE 5. A. corpulenta. A, habitus; B, side of pronotum viewed at 45 °; C, antennomeres 3 – 11; D, aedeagus; E, spermatheca; F, mentum and submentum x 960; G, mesoventrum x 465; H, metaventral posterior margin and coxal plates x 455; I, male ventrites six and seven x 1020; I, pygidium.

FIGURE 2. A. armillata. A, habitus; B, side of pronotum viewed at 45 °; C, mentum and submentum showing chaetotaxy; D, antennomeres 3 – 11; E. spermatheca; F, pygidium showing principal setae; G, pronotum and elytra showing cell structure x 2420; H, mesoventrum x 455; I, metaventral posterior margin and coxal plates x 455.