Pantomorus albosignatus Boheman, 1840

Lanteri, Analia A. & Rio, Maria Guadalupe Del, 2020, Revision of the Pantomorus albosignatus species group (Coleoptera: Curculionidae Entiminae) from Mexico and Central America, Zootaxa 4819 (3), pp. 557-570 : 560-561

Pantomorus albosignatus Boheman

( Figs. 1, 4, 7 , 17, 21 , 26 )

Pantomorus albosignatus Boheman in Schoenherr 1840a: 943 . Type material: lectotype female herein designated, [ Mexico]; 7.5 mm long, pinned, at NHRS, col Schoenherr.

Redescription. Female ( Figs. 1, 7 ) 5.9–7.9 mm long. Vestiture pale grey or pale brown, with characteristic color pattern of whitish stripes and maculae on pronotum and elytra. Pronotum with five longitudinal stripes, extended along midline, dorsum and margins; elytra with white stripes along suture (vanished in some specimens) and intervals 8-9, the latter ascending to interval 6 on posterior third; disc of elytra with pairs of white maculae on base of interval 3, on middle of intervals 2-3 and on posterior third of intervals 2-3. Scales rounded, broadly overlapped, dense, usually forming circles around setae and punctures of elytra. Setae fine, suberect, short and anteriorly direct-ed on rostrum and pronotum, longer and posteriorly directed on elytra, forming 1–2 irregular lines on each interval, very long on apical declivity.

Rostrum truncate-conical (WF/WR 1.40–1.50×), about as long as wide at apex; lateral carinae indistinct. Eyes moderately protruding; postocular constriction feeble. Antennae short, stout, setose, scape not reaching hind margin of eye; funicle segment 2 about as long as segment 1; club ca. 2.2× as long as wide. Pronotum subcylindrical, widest near middle (WP/LP 1.25–1.35×); anterior margin anteriorly curved; sides slightly curved; disc feeble punctate; posterior margin almost straight, slightly beveled. Scutellum setose at apex. Elytra oval (LE/WE 1.30–1.40×; LE/ LP 2.55–2.70×; WE/WP 1.50–1.60×); base straight, thickened; humeri absent; apical declivity moderately abrupt; punctures of striae with distinct round scale on bottom. Legs. Profemora about as wide as metafemora; protibiae mucronate, with line of 8-9 denticles on inner margin; meso- and metatibiae lacking mucro and denticles; corbel of metatibia moderately broad, squamose; distal comb about as long as dorsal comb.

Female genitalia. Spermatheca ( Fig. 17 ) subcylindrical; collum truncate-conical, slightly longer than in other members of the species group, perpendicular to axis of spermathecal body; ramus indistinct; cornu shorter than spermathecal body, apex slightly exceeding level of gland entrance. Spermathecal gland about 1.8× as long as spermatheca; spermathecal duct about 5.4× as long as spermatheca.

Male ( Fig. 4 ) 5.0– 5.4 mm long, rostrum slightly longer than wide at apex, pronotum longer and narrower relative to elytra (LE/LP 2.30×; WE/WP 1.30×). Other ratios similar than in female. Male genitalia ( Fig. 21 ). Penis about as long as ventrites 1-5; penis body strongly curved, slightly shorter than apodemes, with semicircular ostium; apex tapered. Endophallus lacking sclerites.

Geographic distribution ( Fig. 26 ). This species is broadly distributed in several states of Mexico (Aguascalientes, Chihuahua, Coahuila, Durango, Federal District, Guanajuato, Guerrero, Hidalgo, Nuevo León, Oaxaca, Puebla, Querétaro, San Luis Potos, Veracruz and Zacatecas). It usually occurs above 1500 masl, in Acacia grasslands and Acacia -cactus deserts. O’Brien & Wibmer (1982) recorded this species for Guatemala and El Salvador, but we could not confirm these records. We suspect that they might be confused with the fusco-maculate variant of P. crinitus .

Plant associations. Acacia sp., Prosopis , Senna sp. ( Fabaceae ), and Larrea sp. ( Zygophyllaceae ).

Type material: In NHRS we found a single specimen of P. albosignatus labeled as typus. We consider that this specimen is a syntype , because in the original description by Boheman in Schoenherr (1840) there is no clear indication about the number of specimens studied by the author. Consequently, we decided to designate it as lectotype .

Other material examined: MEXICO. Aguascalientes: 24m W Aguascalientes , 5-VI-1956, B. Banta (1♀ BMNH) ; 3mi S Cosio , 9-VII-1982, W.F. Abeles (5♀ BMNH) ; 5mi N Rincón de Romos , 9-10-VII-1982, 1981m, Acacia scrub hillside, RR Mamerski (1♀ BMNH) . Chihuahua: Chihuahua city, 1933, Wickham (5♀ USNM, 8♀ BMNH) ; Santa Bárbara , 1920m, 16-VIII-1947, D Rockefeller exp. (1♀ AMNH) . Coahuila: 13 mi W Saltillo , 1478m, at night, 20-VIII-1971, CW O’Brien & Marshall (1♀ ASUCOB) ; 20mi SE Saltillo , 1828m, 20.21- VI-1971, HF Howden (3♀ CMNC) ; 33 mi SE Saltillo , 2286m, 25-VII-1963, AT Howden (1♀ CMNC) ; Saltillo, Palmer (1♀ BMNH) . Durango: 6 mi N Cuencam , 1524m, 20-VIII-1974, CW & L O’Brien & Marshall (6♀ ASUCOB) ; Durango city, Wickham (2♀ BMNH, 5♀ MNHN) ; Durango, 1933, Wickham (150♀ USNM) ; Hwy 45, 7mi E Du-rango city, 4-VIII-1988, Boldt PE (2♀ USNM) ; El Tscate , 1951m, 28-VII-1947, D Rockefeller exp. (1♀ AMNH) ; 5 mi NE Francisco I. Madero , 2012m, 20-VIII-1974, C & L O’Brien & Marshall (1♀ ASUCOB) ; Gómez Palacio , 8-VII-1970, PM Jump (1♀ CMNC) ; 8 mi NE Guadalupe Victoria , 14-VII- 1963, RB Selander & JM. Kingsolver (2♀ USNM) ; 8 mi NE Guadalupe Victoria , 10-VII-1964 (1♀ MLP) ; 2 mi NW La Zarca , 1981m, 1-VII-1971, L & CW O’Brien & Marshall (2♀ ASUCOB) ; Las Puentes , 2134m, 24-VII-1947, D Rockefeller exp. (1♀ AMNH) ; Nombre de Dios , 1798m, 13-VIII-1947, D Rockefeller exp. (2♀ AMNH) ; San Juan del Río , 1585m, 30-VIII-1947, D Rockefeller exp. (1♀ AMNH) ; Sierra de Durango , Wickham (3♀ BMNH) ; Tepehuanes , Wickham (3♀ BMNH) ; Villa Madero , 2042m, 18-VIII-1947, D Rockefeller exp. (1♀ AMNH) ; 2 mi SW Yerbanis , 1981m, 10-VIII-1974, CW & L O’Brien & Marshall (4♀ ASUCOB) . Federal District : Guadalupe, Wickham (1♀ BMNH) ; Mexico City , Höge (1♀ BMNH) . Guanajuato : no loc. (3♀ BMNH) . Guerrero : Iguala (1♀ BMNH) ; Mezcala , 10-VII-1955, RB & JM Selander (1♂ USNM) . Hidalgo : 20 mi NE Dolores, 16-VIII-1974, 1828m, CW O’Brien & G Marshall (1♀ MLP) ; 15 mi NE Huichapan , 2103m, 18-VIII-1951, C & L O`Brien & Marshall (1♀ ASUCOB) ; 2 mi SE Limapán , 24-VI-1975, LE Watrous (1♀ MLP) ; Pachuca , 1-VII-1965, Spangler PJ (5♀ USNM) ; 18mi NW Pachuca , 1951m, 25-VI-1971, CW Ward & CW O`Brien (1♀ ASUCOB) ; Santiago de Anaya , 2030m, 2035’48’’N, 9857’06’’W, 19VII-1999, AM Corona (1♀ EBCC) ; 8.5 km S. Tasquillo, 1830m, 20 35’48’’N, 9920’4’’W, AM Corona (1♀ EBCC) ; Tula , 3-VII-1963, LR Gillogly (1♀ ASUCOB) ; Tula , Höge (2♀ BMNH) ; 0.8 km N Apan , 20-V-1973 (10♀ USNM) . Nuevo León : 79 mi SW Linares, 2042 m, Hwy 57, 22-VI-1971, CW O`Brien & Marshall (1♀ ASUCOB) ; 14 mi W Monterrey , 1158 m, 14-VIII-1971, C & L O`Brien & Marshall (1♀ ASUCOB) ; 19 mi W Monterrey , 1097m, 21VIII-1974, CW & L O`Brien & Marshall (3♀ ASUCOB) ; 6 mi E San Roberto , 1951m, 15-VIII-1971, CW O`Brien & Marshall (3♀ ASUCOB) . Oaxaca : 9 mi SE El Camarón, 1402m, 2-VI-1974, CW & L O`Brien & Marshall (1♀ ASUCOB) ; Huapanapán , 1727m, 10-VIII-2008, 1809’19.0’’N, 9740’52.8W, H. Casasola & MV Rosas (2♀ MZFC) ; 3.5 mi SW Mitla , 1585m, 4-VIII-1983, Acacia grassland, R. Anderson & W Maddison (6♀ CMNC) ; 11 mi SE No-chixtlán, 2225m, 1-VI-1974, at night, CW & L O`Brien & Marshall (4♀ ASUCOB) ; Oaxaca , 1534m, 14-VII-1955, P & C Vaurie (7♀ AMNH) ; 5 mi SW Oaxaca , 1433m, 4-VII-1983, R Anderson & W Maddison, Acacia thorn scrub (8♀ CMNC) ; Hwy 175, 10 km NE Oaxaca, 1800m, 11-VI-1979, H & A Howden (6♀ CMNC) ; 8 km SW Oaxaca , 1450m, 5-VII-1983, RS Anderson, Acacia thorn scrub (1♀ CMNC) ; 24.3 km N San Gabriel Mixtepec , 1174m, 11VII-1987, R Anderson, cloud forest (1♀ CMNC) ; 39.1 km SE Teotitlán del Camino , 518 m, 21-VII-1987, Acacia scrub, R Anderson (2h 3♂ CMNC) ; 5.7 mi SE Quiotepec , hwy 131, 640m, 21-VII-1987, Kovarik & Schaffner (2♀ 2♂ CMNC) ; 2.1 km S Sgo. Chazumba, Rte 125, 1670m, Acacia scrub, 21-VIII-1992 (1♀ CMNC) ; 10 mi W Tama-zulapán, 2286m, 28-VI-1971, CW O`Brien (1♀ ASUCOB) ; 16 mi SE Tlacolula , 2012m, thorn scrub (1♀ CMNC) . Puebla : 3 mi SE Acatlán, 1158m, 1-VI-1974, CW & L O`Brien & Marshall (2♀ 3♂ ASUCOB) ; 12 mi SE Izucar de Matamoros , 21-VII-1974, RL Mangan & DS Chandler (1♀ ASUCOB) ; Tehuacán , Höge (2♀ BMNH) ; Tla-cotepec, 2-VII-1955, BB & JM Selander & JM Kingsolver (8♀ USNM) . 12.5 km SW Zapotitlan Salinas , 1815’N, 9733’W, 1680m, 8-VII-1992, RL Westcott (1♀, CMNC) . 6 km SW Acatepec , 1813’N, 9738’W, 1990m, 17-VII-1996, RL Westcott (2♀, CMNC) . Querétaro : Amenalco , Laguna de Servin, km 48 Carr. Huimilpán-Amenalco, 25-VII-2000, Felix L & Ruiz J (1♀ MLP) ; 1 mi E Cadereyta , 2073m, 15-VIII-1974, CW & L O`Brien & Marshall (2♀ ASUCOB) ; Cadereyta , 5 km NE Higuerillas, 1530m, matorral, 27-VII-2000, R Jones (2♀ MLP) ; Cadereyta , km 88 carr Vizarron-Peña Blanca, 31-VIII-2000, J L Cozar (2♀ MLP) ; Cerro Ermitaño , 14-VIII-1998, Senna sp, R. Jones (1♀ MLP) ; 20 mi NE Dolores Hidalgo , 2012m, 16-VIII-1974, O`Brien & Marshall (1♀ ASUCOB) ; 1 mi N Sauceda , 2134m, 29-VI-1971, O`Brien & Marshall (10♀ ASUCOB) ; Tequisquiapán , 1900m, 8-VII-1972, J Mateo (1♀ ASUCOB) . San Luis Potos : 1 mi SE La Calzada, 1189 m, on mesquite, 8-VI-1983, R. Anderson (23♀ CMNC) ; Palmar (1♀ BMNH) ; near Río Verde at Media Luna, 20-VI-1982, J.B. Stribling (1♀ BMNH) ; 11.6 km E San Luis Potos , 1707m, Acacia cactus desert, 8-VII-1983, R Anderson (6♀ RSAC) ; 6 km E San Luis Potos , 1945m, Acacia cactus scrub, 3-VII-1987, R. Anderson (6♀ CMNC) ; 65 mi NW San Luis Potos , 2256m, 30-VI-1971, CW O`Brien & Marshall (4♀ ASUCOB) ; 19 mi N SL Potos, on mesquite, 1-IX-1995, E Mockford (1♀ CMNC) ; 10 mi NE San Luis Potos , 1890m; 22-VIII-1954, Dreisbach RR (1♀ USNM) ; Palmar (1♀ BMNH) . Veracruz : Acultzingo, Sallé (2♀ BMNH) ; Córdoba , Höge (1♀ BMNH) . Zacatecas : Fresnillo, 2134m, 15-VIII-1947, D. Rockefeller exp. (1♀ AMNH) ; 10 mi NW Fresnillo , hwy 45, 2225m, 17-VIII-1974, CW & L O`Brien & Marshall (1♀ ASUCOB) ; hwy 45, 41 mi E Sombrerete , 2128m, beating at night, 13-VII-1984, S Mc Cleve & P Jump (10♀ CMNC) ; 31 mi SE Guadalupe, 2195m, 30-VI-1971, on Acacia , L`Brien & Marshall (1♀ ASUCOB) ; 59 km N Zacatecas , beating Larrea , 11-VIII-1969, AN García-Alderete (1♀ ASUCOB) : 15 mi NW Sombrerete , 17-VIII-1957 (1♀ USNM) .

Remarks. Pantomorus albosignatus shows variation in the color pattern of its vestiture. In some specimens the white stripes and maculae are absent and the specimens are almost uniformly grey and in others (mostly those from Oaxaca) the whitish stripes and maculae show greenish reflections. In the specimens from Guerrero the eyes are slightly more protruding than in the typical forms from other places. Males are absent in most samples examined with the exception of bisexual populations only in Oaxaca (Quiotepec) and Puebla (Acatlán).

Figures

FIGURES. 1–8. Pantomorus albosignatus species group. 1, P. albosignatus Boheman, female, dorsal view; 2, P. parvulus Sharp, female, dorsal view; 3, P. andersoni Lanteri & del Río sp. nov., holotype female, dorsal view; 4, P. albosignatus, male, dorsal view; 5, P. parvulus, paralectotype male, dorsal view; 5, P. andersoni sp. nov., allotype male, dorsal view; 7, P. albosignatus, female, lateral view; 8, P. andersoni, holotype female, lateral view. Scales= 1 mm.

FIGURES. 15–25. Pantomorus albosignatus species group. Figs. 15-20 female terminalia. 15, Sternite VIII; 16, ovipositor; 17, P. albosignatus, spermatheca; 18, P. parvulus, spermatheca; 19, P. andersoni, spermatheca; 20, P. crinitus, spermatheca. Scales: 0.25 mm. Figs. 21-25 male genitalia. 21, P. albosignatus, penis, lateral view; 22, P. parvulus, penis, lateral view; 23, P. andersoni, penis, lateral view; 24, P. crinitus, penis, lateral view; 25, P. andersoni, dorsal view of apex. Figures 15–16, 21–25 scales= 0.50 mm. Figures 17–20 scales= 0.25 mm.

FIGURE. 26. Pantomorus albosignatus species group, map of distribution. Pantomorus parvulus, black triangle; P. albosignatus, white circle; P. andersoni n. sp., black square; P. crinitus, black star.