Anchorius dollyae Tello & Tello-Arriagada, 2024

Tello, Francisco & Tello-Arriagada, Cristóbal, 2024, First report of the genus Anchorius Casey, 1900 (Coleoptera: Biphyllidae) in Chile, with description of a new species, Revista Chilena de Entomología (Rev. Chil. Entomol.) 50 (4), pp. 625-631 : 627-629

Anchorius dollyae Tello & Tello-Arriagada , sp. nov.

( Figs. 1-14)

Diagnosis. This new species can be distinguished from its congeners based on the following combination of characters: (1) the presence of 10 longitudinal setal lines on the pronotum, the second lines being truncated by converging with the first setal lines; (2) the presence of well-defined femoral and lateral lines of the first ventrite; (3) an incomplete metaventral discrimen, occurring in the posterior two-thirds of the metaventrite; and (4) the median lobe of the aedeagus does not protrude from the paramere.

Description. Male habitus ( Fig. 1). Measurements (n = 17): length: 3.10-3.67 mm, and width: 1.45-1.51 mm; body elongate in dorsal view, moderately convex in lateral view; integument dark brown homogeneous; dorsum textured, with punctuation of moderate size and homogeneously distributed in rows; short, dark brown pubescence homogeneously distributed on the integument, combined with long and yellow setae distributed in longitudinal rows on the pronotum and elytra. Head. Prognathous, transverse, insert in the prothorax to base of the eyes; setae equivalent to pronotum and elytra. Frontoclypeal suture absent, though it is slightly insinuated on the frontoclypeal margin. Eyes dark, large, round, and moderately protruding; interfacetal setae present, barely protruding; ommatidium small. Antennae capitate, with small setae on the integument and few largest setae in the margins of each segment; scape cylindrical, wider than the pedicel, and the antennal club segments IX to XI are prominently expanded laterally and rounded ( Fig. 3). Mandibles dorsally and ventrally visible, bidentate at their apices, but with small denticles; the molar in the mesal edge area with setiferous margins, the molar setae are short ( Fig. 6). Maxillary palps with four segments, with small setae longitudinally distributed in segment I ( Fig. 7); segment I of the maxilla is longer than wide, while segments II and III are of equivalent size and shape, narrower at the base and widened distally; segment IV is oblong, longer than wide, with a truncated apex; galea and lacinia pubescent at the apex ( Fig. 7). Labial palps with three segments, with small setae longitudinally grouped; segments I and II are reduced, while segment III is conspicuously widened and truncated; the mentum has three well-defined apices, with the central one being smaller, ligule bilobed, and pubescent ( Fig. 8). Thorax. Pronotum transverse, wider than the head; anterior angles rounded and posterior angles sub-rectangular, not protruding from the lateral margin; 10 well-defined longitudinal carinae, the lateral carinae are more prominent than central carinae; carinae are accompanied by rows of well-defined, light-yellow setae; setal line II is truncated due to converging with setal line I. Line II converges in the posteromedial section of line I; line III is slightly oblique and sinuated in the posterior section, converging toward the base with line II, but not joined; lines IV and V are slightly sinuated and are subparallel to the lateral margin of the pronotum ( Fig. 13). Hypomeral area of pronotum with fine punctuation and short setae, without apparent modifications ( Fig. 2). Procoxal cavities closed. Proventral process slightly widened medially. Scutellum transverse, 2.5 times longer than wide, with rounded margins. Elytra elongate, with short, dark brown setae homogeneously distributed on the interstriae, combined with long, yellow setae distributed in longitudinal rows on the elytral groove; humeral angles not protruding. Mesoventrite narrower than metaventrite; mesoventral process acute in posterior section. Metaventral discrimen present, incomplete, present only up to the posterior third ( Fig. 4); metaventral lateral lines present ( Fig. 4). Legs. Slender and shorter, slightly protruding laterally. Femora with apices moderately reduced. Meso- and metafemora wider than profemora. Tibiae straight, with at least 4 small spurs at the apex. Tarsal formula: 5-5-5; tarsomeres I and IV reduced; tarsomeres I to III with a lateral lobe-like modification, noticeably expanded in tarsomeres II and III; tarsomere V elongated. Tarsal claws simple ( Fig. 14). Abdomen. First ventrite with both well-defined femoral and lateral lines. The femoral lines form a triangular shape. Both sets of lines connect anteriorly and posteriorly with the margins of the ventrite ( Fig. 5); remaining ventrites without supplementary lines. Male genitalia. Aedeagus subcylindrical and elongate. Median lobe without apparent modifications, as long as the parameres, not protruding as in A. lineatus . Parameres lobed, not bifurcated, with small setae at apex ( Figs. 9, 11).

Female genitalia. Baculum elongate and well defined. Oblique baculum conspicuous and subtriangular; stylus with small, conspicuous punctures, apex rounded and with elongate setae. Vulval lobe elongated, anterior margin expanded ( Figs. 10, 12).

Etymology. The specific name is in honor of Dolly Lanfranco (Universidad Austral de Chile) for his contributions to Chilean entomology.

Type material. Holotype male: Chile, Prov. Valdivia / Sto. Domingo / Valdivia-Chile / 29-11-87 / [collector] E. Krahmer [ MNNC] . Paratypes: female (5 specimens): [paratype 1] Chile Cauquenes / Reserva Nacional Los / Queules 26 Dic. 2000 / Leg. M. Guerrero [ MNNC]. [paratype 2] Altos de Vilches / Talca 1280 mts / 25-26-XI-1970 / [collector] J. Solervicens [ MNNC]. [paratypes 3 and 4] Pemehue [Región de La AraucanÍa] / Ene - 1896 [Ene = January; Philibert Germain collector] [ MNNC]. [Paratype 5] Prov. Valdivia / Sto. Domingo / Valdivia-Chile / 29-11-87 / [collector] E. Krahmer [ CEEK] .

Other examined material. 5 specimens labeled: Pemehue [La AraucanÍa region] / Ene - 1896 [Ene = January; Philibert Germain collector] [ MNNC] . 1 specimen labeled: Chile Cauquenes / Reserva Nacional Los / Queules 26 Dic. 2000 / Leg. M. Guerrero [ MNNC] . 6 specimens without label information [ MNNC] .

Distribution. Chile, from San Clemente (Maule Region) to Valdivia (Los RÍos Region) ( Fig. 15).