Aegomorphus personatus, Heffern & Santos-Silva, 2023

Heffern, Daniel & Santos-Silva, Antonio, 2023, Descriptions of two new species of American Cerambycidae, and redescription of Leptostylus subfurcatus (Cerambycidae, Coleoptera), Zootaxa 5343 (4), pp. 338-352 : 346-351

Aegomorphus personatus sp. nov.

( Figs 26–35 , 41 )

Description. Holotype male ( Figs 26–32 ). Integument mostly blackish; anteclypeus brown centrally, yellowish brown laterally; labrum brown; ventral mouthparts mostly reddish brown, except maxillary palpomeres II–IV and labial palpomeres black with the apex reddish brown; gulamentum dark brown; antennomere III with dark reddish brown ring on apical third; antennomere IV brown basally, dark brown on remaining basal half, black on apical third, dark reddish brown on remaining surface; dark brown basally and on ring before middle, brown on remaining basal 3/5, blackish on apical 2/5; antennomeres V–XI reddish brown on basal half, slightly darker basally, dark brown on apical half. Meso- and metatibiae with two dark reddish brown maculae, one close to middle, another close to apex, both not reaching ventral surface. Tarsomeres I–III partially dark reddish brown, blackish on remaining surface; tarsomeres V mostly reddish brown.

Head. Frons longitudinally depressed close to genae; moderately sparsely, coarsely punctate; with abundant dark yellowish-brown pubescence not obscuring integument and long, erect blackish setae interspersed, some erect setae pale apically.Area between antennal tubercles and upper eye lobes moderately sparsely, coarsely punctate; remaining surface of vertex densely, finely punctate; area close eyes with yellowish-white pubescence not obscuring integument; remaining surface with yellowish-brown pubescence, slightly sparser centrally between antennal tubercles except glabrous median groove, and large dark-brown pubescent macula on each side of posterior region.Area behind upper eye lobes abundantly, finely punctate; with yellowish-brown pubescence not obscuring integument, almost absent close to eye toward vertex; with a few long, erect blackish setae close to eye. Area behind connection between eye lobes moderately abundantly and coarsely punctate; with yellowish-brown pubescence anteriorly, glabrous close to prothorax. Area behind lower eye lobes densely, finely punctate close to eye, moderately sparsely, coarsely punctate close to prothorax, and densely, minutely punctate between two former punctate areas; with yellowish-brown pubescence partially obscuring integument close to eyes, pubescence paler toward genae, with a few long erect pale-yellow setae interspersed, glabrous close to prothorax. Genae abundantly, moderately finely punctate, with coarser punctures interspersed close to smooth apex; with abundant pubescence close to eye, pubescence yellowish white toward ventral surface, yellowish brown toward frons, and sparse yellowish-brown pubescence on remaining surface except glabrous smooth apex. Wide central area of postclypeus densely, moderately coarsely punctate; with abundant, bristly dark yellowish-brown pubescence not obscuring integument close to frons, and fringe of long setae of same color close to anteclypeus; with long, erect blackish setae interspersed close to frons. Sides of postclypeus mostly glabrous. Labrum with sparse brownish pubescence except glabrous anterocentral region; with long, erect yellowish-brown setae interspersed close to glabrous area; anterior margin with fringe of short yellowish-brown setae. Antennal tubercles abundantly, finely punctate except smooth apex; with abundant, both yellowish-brown and brown pubescence partially obscuring integument except glabrous apex. Outer margin of mandibles triangularly depressed centrally on basal 2/3, depression abundantly, finely punctate with yellowish pubescence not obscuring integument, pubescence darker toward anterior region; remaining surface smooth and glabrous. Gulamentum mostly smooth and glabrous; intermaxillary process depressed, sparsely, minutely punctate, with sparse yellowish-white pubescence. Area of connection between eye lobes carinate ( Fig. 32 ), without ommatidia; distance between upper eye lobes 0.28 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.59 times distance between outer margins of eyes.Antennae 1.9 times elytral length, reaching elytral apex at basal quarter of antennomere VII. Scape piriform, dorsally depressed on basal quarter; densely, minutely punctate; with brown pubescence not obscuring integument dorsally, except apex with yellowish pubescence; lateral surfaces and ventral surface with moderately abundant yellowish-white pubescence not obscuring integument. Pedicel with abundant brown pubescence not obscuring integument on basal half of dorsal and lateral surfaces, sparse brown pubescence on basal third of ventral surface, abundant yellowish-white pubescence on remaining lateral and ventral surfaces, and yellowish-brown pubescence on remaining dorsal surface. Antennomere III with sparse brown pubescence basally, followed by yellowish-white pubescent ring, yellowish-white pubescent ring on dark reddish brown ring, and yellowish-white pubescence on apex of dorsal surface; remaining dorsal and lateral surfaces with dark-brown pubescence not obscuring integument; ventral surface with abundant yellowish-white pubescence between two rings and brown pubescence not obscuring integument on remaining surface; with long, erect yellowish setae ventrally. Antennomere IV dorsally and laterally with abundant yellowish-white pubescence on basal fifth and on reddish brown ring; remaining dorsal and lateral surfaces with brown pubescence not obscuring integument; basal 3/4 of ventral surface with abundant yellowish-white pubescence partially obscuring integument and abundant brown pubescence not obscuring integument on apical quarter; with long, erect yellowish setae ventrally. Antennomeres V–XI with abundant yellowish-white pubescence partially obscuring integument on basal reddish-brown area and dark pubescence not obscuring integument on dark apical area, except entire glabrous longitudinal central area of ventral surface; antennomeres V–VII with a few long, erect dark setae ventrally, and a few long, erect dark setae on dorsal apex; ventral surface of antennomeres X–XI ( Figs 30–31 ) with abundant, erect dark brown setae, and ventral surface longitudinally carinate. Antennal formula (ratio) based on length of antennomere III: scape = 0.69; pedicel = 0.25; IV = 0.85; V = 0.60; VI = 0.50; VII = 0.45; VIII = 0.43; IX = 0.32; X = 0.21; XI = 0.22.

Thorax. Prothorax wider than long; lateral tubercles large, conical, located centrally. Pronotum with large, elevated subconical tubercles on each side of anterior half; center with longitudinal carina from near anterior margin to near posterior margin, slightly widened on its posterior region; moderately abundantly, coarsely, deeply punctate except on anterolateral tubercles; with abundant yellowish-brown pubescence not obscuring integument, pubescence denser anterolaterally and posterolaterally, except brown pubescence not obscuring integument on anterolateral tubercles and irregular, longitudinal band from tubercles to near posterior margin, and narrow whitish pubescent band centrally close to anterior and posterior margins. Sides of prothorax abundantly, coarsely punctate; with abundant yellowish-brown pubescence partially obscuring integument, except sparse pubescence anteriorly close to prosternum and subglabrous area close to posterior margin. Prosternum moderately sparsely, very finely punctate; with sparse straw-colored pubescence, almost absent close to anterior margin. Prosternal process somewhat finely rugose; with moderately sparse straw-colored pubescence on anterior half, gradually denser toward apex on apical half; narrowest area 0.54 times procoxal width. Central area of mesoventrite subglabrous; lateral regions with dense straw-colored pubescence. Mesoventral process slightly longitudinally tumid centrally, without anterolateral tubercles; with moderately abundant yellowish-white pubescence not obscuring integument; apical width 1.1 times mesocoxal width. Mesanepisterna and mesepimera with abundant yellowish-brown pubescence, sparser centrally on mesanepisterna. Metanepisterna with abundant yellowish-brown pubescence on anterior 2/3 and close to apex, and abundant brown pubescence not obscuring integument on remaining surface. Metaventrite with abundant straw-colored pubescence not obscuring integument, denser close to metacoxal cavities, absent on metathoracic discrimen, and almost absent on part of posterocentral region. Scutellum with abundant yellowish-brown pubescence anterolaterally, abundant dark brown pubescence posterolaterally, very sparse whitish pubescence anterocentrally, and abundant pale-yellow pubescence posterocentrally. Elytra. Gradually narrowed from humeri to apex; apex truncate, slightly sinuous; with longitudinal centrobasal crest on anterior sixth; with two slightly distinct longitudinal carinae dorsally, innermost starting on apex of centrobasal crest ending on posterior sixth, outermost from base, between humerus and centrobasal crest, ending on posterior sixth, both fused apically; humeral carina slightly distinct, ending near elytral apex; moderately abundantly, coarsely punctate; anterior sixth with abundant yellowish-brown pubescence not obscuring integument, with irregular whitish pubescent maculae interspersed; with dense, transverse, wide yellowish-brown pubescent band on second anterior sixth, from epipleural margin to suture, with its anterior and posterior margins irregular, and widened on center of dorsal surface; with irregular, transverse dark-brown pubescent band dorsally near suture, located close to anterior margin of dense yellowish-brown pubescent band; with oblique, irregular dark-brown pubescent band close to suture, located close to posterior margin of dense yellowish-brown pubescent band; with irregular, moderately large dark-brown pubescent macula laterally close to posterior margin of dense yellowish-brown pubescent band; with large, irregular dark-brown pubescent macula near middle of dorsal surface; with inverted V-shaped dark-brown pubescent macula dorsally on posterior fifth; with dashed white pubescent band close to suture, from dense yellowish-brown pubescent band to apex; remaining surface mostly with abundant yellowish-brown pubescence and white pubescence interspersed, especially on inner region of dorsal surface, except glabrous area surrounding nearly all punctures. Legs. Femoral peduncles with yellowish-white pubescence except some glabrous irregular areas and brownish pubescent macula on dorsal surface of meso- and metafemora; femoral clubs with abundant, both brownish and yellowish-brown pubescence not obscuring integument. Tibiae with two yellowish-white pubescent rings, one near base, another about middle; apex with yellowish-white pubescent arc dorsally and laterally; remaining dorsal and lateral surfaces with dark pubescence not obscuring integument, except bristly dark yellowish-brown pubescence on apical half of ventral surface of protibiae and apical third of ventral surface of meso- and metatibiae; apical third of dorsal surface of mesotibiae with short, thick, erect dark-brown setae; with long, erect yellowish-white setae interspersed throughout on all tibiae. Dorsal surface of tarsi mostly with yellowish-white pubescence not obscuring integument; metatarsomere I longer than II–III together.

Abdomen. Ventrites with abundant yellowish-white pubescence not obscuring integument, except glabrous apex of ventrites 1–4. Apical margin of ventrite 5 widely concave.

Female ( Figs 33–35 , 41 ). Similar to males in general appearance and pubescent pattern. They differ by antennae shorter, 1.55 times elytral length, reaching elytral apex at basal third of antennomere IX, and by posterior margin of abdominal ventrite 5 rounded.

Dimensions in mm (Holotype male/ paratypes female). Total length, 13.35/12.25–14.90; prothoracic length, 2.50/2.20–2.35; anterior prothoracic width, 3.45/3.05–3.40; posterior prothoracic width, 3.20/2.90–3.20; maximum prothoracic width, 4.75/4.05–4.50; humeral width, 5.25/4.65–5.15; elytral length, 8.90/8.40–9.10.

Only the holotype and two paratype females were fully measured; only the total lengths of the other paratypes were measured as follows: males, 11.0–14.0; females, 11.0–14.0.

Type material. Holotype male from MEXICO, Jalisco: 2 km W jct Hwy 23 & rd to Huaxtla , 1450 m, 20º55’58”N 103º24’57”W, 16.VII.2017, R. Cunningham & G. Nogueira leg. ( CNIN) . Paratypes – MEXICO, Jalisco: La Venta del Astirello, 1600 m, 1 female, 16.VI.1999, G. Nogueira leg. ( MZSP); 1700 m, 1 male, 2.VII.2010, G. Nogueira leg. ( JVCO); 1680 m, 1 female, 22.VI.2012, G. Nogueira leg. ( DHCO); Zapopan , La Primavera, 20.6875ºN 103.47086ºW, 1600 m, 1 male, 1 female, 22.VI.2009, G. Nogueira leg. ( DHCO); 1680 m, 5 males, 4 females, 18-19.VI.2014, G. Nogueira leg. (3 males and 3 females, TAMU; 1 female, MZSP; 1 male, 1 female, SWLC); (pine/oak forest) , 20º41.15’N 103.28.41’W, 1 specimen, 23.VI.2012, R. Cunningham leg. ( LGBC); Sierra de Manantlán, 1450 m, 1 male, 15-16.VII.1996, G. Nogueira leg. ( TAMU); 2 km W jct. Hwy 23, road to Huaxtla , 1450 m, 20º55’58”N 103º24’57”W, 1 female, 15.VII.2017, R. Cunningham & G. Nogueira leg. ( DHCO) . Nayarit: 5–18 km NE Compostela , 1 female, 10.VII.2019, J. Rifkind leg. ( LGBC); El Zopilota, 400 m, 1 female, 21.VII.1998, G. Nogueira leg. ( DHCO) . Baja California Sur: San José del Cabo , 605 m, 1 female, 14.IX.2012, R. Cunningham leg. ( DHCO) .

Etymology. Latin, “personatus” (masked); alluding to the yellowish-brown band on the anterior third of the elytra.

Remarks. Aegomorphus personatus sp. nov. is similar to A. arizonicus Linsley & Chemsak, 1984 (see photographs on Bezark 2023a), but differs as follows: distance between upper eye lobes shorter, 2.5 times maximum width of one upper lobe; transverse pubescent band on the anterior region of elytra yellowish-brown, dorsally not acutely projected backward on its posterior margin. In A. arizonicus , the distance between upper eye lobes is 3.0 times maximum width of one upper lobe, and the transverse pubescent band on the anterior region of elytra is mostly yellowish-white and dorsally acutely projected backward on its posterior margin. Aegomorphus personatus sp. nov. is also similar to Acanthoderes (Acanthoderes) aliciae Chemsak & Hovore, 2002 ( Figs 36–40 ), a species that apparently belong to Aegomorphus due to “eyes moderately coarsely faceted” ( Chemsak & Hovore 2002), a feature of Aegomorphus and not of Acanthoderes (Acanthoderes) , in which the eyes are very finely faceted. However, A. pesonatus sp. nov. differs as follows: prosternal process narrower, 0.54 times procoxal width ( Fig. 41 ); base of elytra not distinctly exposing integument; and transverse and dense yellowish-brown pubescent band on the anterior third of the elytra not divided by dense white pubescence. In Acanthoderes (Acanthoderes) aliciae , the prosternal process is wider, 0.69 times procoxal width ( Fig. 40 ), base of elytra distinctly exposes the integument, and the transverse yellowish-brown pubescent band on the anterior third of the elytra is divided by dense white pubescence, which is projected toward middle of the elytra.

Figures

FIGURES 26–35. Aegomorphus personatus sp. nov. 26–32) Holotype male: 26) Dorsal habitus; 27) Ventral habitus; 28) Lateral habitus; 29) Head, frontal view; 30) Antennomeres IX–XI, lateral view; 31) Antennomeres IX–XI, ventral view; 32) Conection between eye lobes. 33–35) Paratype female: 33) Conection between eye lobes; 34) Dorsal habitus; 35) Ventral habitus.

FIGURES 36–41.Acanthocininispp.36–40) Acanthoderes(Acanthoderes) aliciaeChemsak& Hovore,2002:36) Dorsal habitus; 37) Ventral habitus; 38) Lateral habitus; 39) Head, frontal view; 40) Prosternal and mesoventral processes. 41) Aegomorphus personatus sp. nov., paratype female, prosternal and mesoventral processes. Figures 36–40 by Enrique Ramírez García.