Pantomorus andersoni Lanteri, 2020

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 : 563-565

Pantomorus andersoni Lanteri & del Rio, sp. nov.

( Figs. 3, 6, 8 , 19, 23, 25 , 26 )

urn:lsid:zoobank.org:act:911EBCD9-FA47-4931-949D-1D1572110958

Type material. Holotype female, 6.5 mm long, glued on a card [Mex: Guerrero / 2-4mi N/ Chilpancingo / VI-241983] [B.K. Dozier] ( FSCA). Allotype male, 6 mm long, glued on a card [Mex: Guerrero / 2-4 mi N/ Chilpancingo /24-VI-1983] [B. K. Dozier] ( FSCA). Other paratypes: Guerrero: 2-4 mi N Chilpancingo, 24-VI-1983, B.K. Dozier (1♂ FSCA, 1♂ MLP); Mezcala, 3-VI-1946, J & D Pallister (1♀ 1♂ AMNH); 10-12 km E Xochipala, 795-885m, 1748´N 98 25’W, 30-VI-1992, RL Westcott (1♀ CMNC, 1♀ MLP); 9.7 km E Xochipala, 1036m, 5-VII-1987, R Anderson , Acacia cactus woodland (1♂ CMNC); 3 km SE Xalitla, 610m, 1800’N, 9824’W, 16-VII-1992, RL Westcott (1♀ CMNC).

Differential diagnosis. The background color of vestiture is usually darker than in P. albosignatus ; scales are larger, more appressed, and do not form circles around punctures and setae of the elytra; setae along intervals are denser. Eyes are more protruding; pronotum is slightly truncate conical instead of subcylindrical, more strongly punctate on dorsum, with slightly bisinuate, beveled posterior margin, and posterolateral angles produced, directed outwards; elytra are shorter with respect to the pronotum, punctures of the striae are larger and apical declivity is more abrupt. The collum of the spermatheca is slightly shorter than in P. albosignatus ; the spermathecal duct and gland are slightly longer, same as the penis of the males.

Description. Holotype female ( Figs. 3, 8 ) 6.5 mm long. Vestiture dense, usually brown with characteristic patter of whitish stripes. Pronotum with five longitudinal stripes, extended along midline (very narrow), dorsum and margins, the latter prolonged on head (below eyes) and elytra (marginal stripes); disc of elytra with three pairs of white maculae, on intervals 3, 3-4, and 2-5, in some specimens confluent with each other and with the marginal stripe, ascending from interval 9 to 6 in the posterior third. Scales rounded, broadly overlapped in the white stripes, and somewhat elongate in the dark- brown background of elytra. Setae on dorsum fine, suberect, shorter and anteriorly directed on head and pronotum, longer and posteriorly directed on elytra, forming 3–4 irregular lines along each interval, longer on apical declivity. Vestiture of venter composed of whitish scales on sides of abdomen and suberect setae. Legs covered with small, round, scattered scales and fine setae.

Rostrum strongly truncate-conical (WF/WR 1.55×), as long as wide at apex; lateral carinae feeble. Eye round-ed, strongly protruding; postocular constriction distinct. Antennae short, stout, setose; scape coarse, reaching about 2/3 of eyes; funicle segment 2 ca. 1.5× as long as segment 1, funicle segments 3–7 ca. 1.5× as long as wide at apex, club ca. 2× as long as wide. Pronotum slightly subconical, with curved flanks (WP/LP ca. 1.30×); anterior margin almost straight; sides divergent, slightly curved; disc strongly punctate; posterior margin slightly bisinuate, beveled. Scutellum small, setose. Elytra oval, very short and broad (LE/WE 1.25×; LE/LP 2.25×; WE/WP 1.40×); base slightly V-shaped, thickened; humeri absent; apical declivity abrupt; intervals flat; punctures of striae broad. Legs. Profemora slightly wider than metafemora (PF/MF 1.15×); protibiae mucronate, with line of 8-9 denticles on inner margin; meso and metatibiae lacking mucro and denticles; corbel of metatibiae moderately broad, covered with small scales; distal comb about as long as dorsal comb.

Female terminalia. Sternite VIII and ovipositor as in figures 15–16. Spermatheca ( Fig. 19 ) subcylindrical; collum truncate-conical, almost perpendicular to axis of spermathecal body, slightly shorter than in P. albosignatus ; ramus indistinct; cornu shorter than spermathecal body, apex reaching level of gland entrance. Spermathecal gland ca. 2.2× as long as spermatheca; spermathecal duct ca. 5.7× as long as spermatheca.

Allotype male ( Fig. 6 ) 6 mm long. Pronotum slightly narrower and more elongate relative to elytra (WF/WR 1.50×, WP/LP 1.25×, LE/WE 1.30×, LE/LP 2.10×; WE/WP 1.30×). Profemora slightly wider than in females (ca. 1.18×); mesotibiae with small mucro. Male genitalia ( Figs. 23, 25 ). Penis about as long as abdomen; penis body strongly curved, slightly shorter than its apodemes, more slender than in remaining members of the species group, with semicircular ostium; apex tapered. Endophallus lacking sclerites.

Geographic distribution ( Fig. 26 ). Mexico (Guerrero), between 500 and 1000 masl, in Acacia-cactus woodlands .

Remarks. Most specimens of P. andersoni are slightly larger than those of P. albosignatus , and the background color of the vestiture is usually darker (dark-brown instead of grey), however, in one paratype from Xochipala the background is almost uniformly grey and the typical maculation of the species is almost absent.

In the samples of P. andersoni the ratio females/males is about 1. Conversely, most populations of P. albosignatus occurring above 1,500 masl are composed only of females.

Etymology. This new species is described after the outstanding weevil specialist and very good friend Robert Anderson, from the Canadian Museum of Nature.

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.