Hamaederus fraterculus ( Martins, 1979 ) Botero, 2021

Botero, Antonio Santos-Silva Kimberly García Juan Pablo, 2021, A review of the history of the names Hamaticherus Dejean and Plocaederus Dejean and description of a new genus and species (Coleoptera: Cerambycidae: Cerambycinae), Insecta Mundi 2021 (887), pp. 1-32 : 14-16

Hamaederus fraterculus ( Martins, 1979) , new combination

( Fig. 34–42 )

Brasilianus fraterculus Martins 1979: 26 ; Fragoso 1982: 149; Monné 1993: 2 (cat.).

Brasilianus (Brasilianus) fraterculus ; Monné and Giesbert 1994: 34 (checklist).

Plocaederus fraterculus ; Martins and Monné 2002: 233; Monné 2005: 57 (cat.); Monné and Hovore 2006: 36 (checklist); Galileo et al. 2011: 10, 80 (distr.); Monné 2021: 74 (cat.).

Redescription. Male ( Fig. 34–37 ). Integument mostly black. Ventral mouthparts mostly dark brown posteriorly, mostly reddish-brown anteriorly (maxillary palpomere IV and labial palpomere III brown with apex reddish-brown); part of anteclypeus and anterior area of labrum brownish. Elytra rufous except for black margins.

Head. Frons coarsely, abundantly punctate, punctures slightly sparser on frontal plate; with sparse, white pubescence, almost absent on sides of frontal plate. Area between antennal tubercles and upper eye lobes coarsely, abundantly, confluently punctate laterally, almost smooth centrally; with abundant white pubescence laterally, almost absent centrally. Remaining surface of vertex with abundant, transverse, small rugosities (more punctateplicate centrally toward eyes); with sparse white pubescence toward eyes, almost glabrous toward prothorax. Area behind upper eye lobes somewhat finely, abundantly, confluently punctate close to eye, with abundant, transverse, small rugosities toward prothorax; with minute, sparse white pubescence, sparser toward prothorax. Area behind lower eye lobes coarsely rugose-punctate toward upper eye lobe, except narrow smooth area close to eye (sometimes entire area close to eye smooth), longitudinally plicate toward ventral surface; with short, decumbent, very sparse yellowish-white setae. Genae somewhat finely and rugose, except smooth apex; with minute, sparse white pubescence on punctate area. Antennal tubercles coarsely, somewhat abundant punctate, except smooth apex; with white pubescence not obscuring integument, except glabrous smooth area. Wide central area of postclypeus coarsely, abundantly punctate, and sides smooth; with sparse white pubescence on wide central area, glabrous laterally. Labrum coplanar with anteclypeus posteriorly, inclined anteriorly; smooth and glabrous close to anteclypeus, finely punctate close to the inclined area (punctures anastomosed, forming elliptical depression on each side); coplanar area with minute, sparse white setae centrally, and long yellowish setae directed forward laterally; inclined area with somewhat long and abundant yellowish setae. Gulamentum almost smooth, glabrous posteriorly, depressed, finely, sparsely punctate, with short, erect, sparse yellowish-white setae between eyes. Distance between upper eye lobes (only one male measured) 0.12 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.50 times distance between outer margins of eyes. Antennae 2.5 times elytral length, reaching elytral apex at basal quarter of antennomere VIII. Scape without apical cicatrix; scape, pedicel, and antennomeres with abundant white pubescence not obscuring integument, except glabrous, narrow dorsal apex of III and IV; antennomeres III–X with apex tumid and triangularly projected on outer apex; antennomeres V–X somewhat flattened dorso-ventrally; antennomere XI arched, with posteriorly area not abruptly narrowed. Antennal formula based on length of antennomere III: scape = 0.71; pedicel = 0.16; IV = 0.80; V = 1.09; VI = 1.18; VII = 1.21; VIII = 1.21; IX = 1.21; X = 1.11; XI = 1.52.

Thorax. Prothorax wider than long; lateral tubercles large, conical, placed centrally. Pronotum transversely, irregularly plicate on wide central area, except on central gibbosity placed from anterior third to posterior fifth (anterior area of this gibbosity carina-shaped); finely, abundantly punctate among folds and on central gibbosity; finely, abundantly punctate on anterior and posterior fifth; with abundant white pubescence not obscuring integument (more yellowish-white depending on light intensity), almost absent on central gibbosity, shorter and sparser close to anterior margin, absent inside posterior sulcus. Sides of prothorax transversely, irregularly plicate, and finely, abundantly punctate on wide central area; smooth inside anterior and posterior sulci; posterior border and proepimeron somewhat finely rugose; with abundant white pubescence not obscuring integument, nearly absent anteriorly (this area widened toward prosternum), and sparse on posterior border and proepimeron. Prosternum somewhat rugose-punctate about posterior half, with transverse sulcus about middle, irregularly plicate-punctate from central sulcus to anterior sulcus, finely punctate close to anterior margin; with abundant white pubescence from anterior sulcus to procoxal cavities (pubescence denser toward posterior area), glabrous inside anterior sulcus, and with short yellowish-white pubescence on sides of area close to anterior margin. Prosternal process strongly inclined posteriorly, with rounded protuberance in the just after inclined region (sometimes slightly conspicuous); narrowest area 0.3 times procoxal width. Ventral surface of meso- and metathorax with abundant white pubescence, partially obscuring integument laterally (pubescence shorter and sparser on anterocentral area of mesoventrite). Mesoventral process with tab-shaped process on sides of apex, strongly, widely emarginate centrally on posterior margin; narrowest area 0.7 times mesocoxal width; central area widely, longitudinal depressed, without tubercle. Scutellum with yellowish pubescence on margins, nearly glabrous on remaining surface (sometimes, pubescence white, covering most of surface). Elytra. Finely, densely punctate; apex from rounded to truncate, often with sutural angle slightly projected; with abundant white pubescence not obscuring integument. Legs. Femora with abundant white pubescence not obscuring integument; apices not spiniform. Tibiae with abundant white pubescence not obscuring integument, except dense, bristly light yellowish-brown pubescence on posterior area of ventral surface. Metatarsomere I shorter than II–III together.

Abdomen. Ventrites finely, abundantly punctate, except smooth apex of I–IV; with abundant white pubescence not obscuring integument; apex of ventrite V truncate, slightly emarginate centrally.

Female ( Fig. 38–42 ). Similar to male, differing especially by the antennae distinctly shorter (1.75 times elytral length, reaching elytral apex at basal third of antennomere X; only one female measured).

Dimensions (mm) (male (3)/ female (4)). Total length, 15.55–16.60/14.65–16.70; prothoracic length, 3.05–3.35/2.65–3.10; anterior prothoracic width, 2.65–2.80/2.30–2.65; posterior prothoracic width, 2.95– 3.15/2.65–3.05; maximum prothoracic width, 3.65–4.10/3.35–3.80; humeral width, 4.35–4.70/4.10–4.50; elytral length, 9.70–10.65/9.25–10.25. Dimensions of the holotype (original description): Total length, 12.90; prothoracic length, 2.70; maximum prothoracic width, 3.50; humeral width, 3.80; elytral length, 8.90.

Material examined. BOLIVIA (new country record), Santa Cruz: El Refugio Los Volcanes , 3363′, 1 male, 1–10.X.2008, Morris and Wappes leg. ( RFMC) ; 1 male, 2 females, 18–24.X.2014, Morris and Wappes leg. ( RFMC) ; 4 km N Bermejo, Refugio Los Volcanes , 1045–1350 m, 18°06′S / 63°36′W, 1 male ( MZSP, formerly ACMT), 1 female ( FSCA, formerly ACMT), 17–24.X.2014, Wappes and Morris leg. ; 20 km N Camiri, Road to Eyti , 1250 m, 6–8 km E Hwy 9, 19°52′S / 63°29′W, 1 female, 5–10.XII.2012, Wappes, Bonaso and Skillman leg. ( MZSP, formerly ACMT) .

Remarks. Hamaederus fraterculus was described based on a single female from Paraguay (Boquerón). Formally, this is the only known specimen of this species, although Bezark (2021) illustrated a female from the collection of the late Ole Mehl from Paraguay (Canindeyú), which may or may not belong to H. fraterculus . Martins (1979) described the elytral apex as rounded. However, the elytral apex is from truncate to rounded in this species. The male is unknown.

Hamaederus fraterculus belong to the group of species without a cicatrix on the apex of the scape.

Figures

Figures 34–42. Hamaederus fraterculus (Martins, 1979). 34–37) Male. 34) Dorsal habitus. 35) Ventral habitus. 36) Lateral habitus. 37) Head, frontal view. 38) Female, dorsal habitus. 39–42) Holotype female. 39) Head, oblique view. 40) Dorsal habitus. 41) Ventral habitus. 42) Lateral habitus.