Pantomorus albosignatus, Boheman in Schoenherr, 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 : 558-559

Pantomorus albosignatus species group

(Habitus Figs. 1–14 ; genitalia Figs. 15–26 ; map of distribution Fig. 27)

Diagnosis. Species relatively small (females 5.5–8.3 mm; males 5.0– 7.9 mm), covered with dense scaly vestiture that forms a characteristic maculation of three pairs of white maculae on grey or brown background ( P. albosignatus and P. andersoni ) or dark- brown maculae on a pale background ( P. parvulus and P. crinitus ), almost effaced in some specimens (particularly P. crinitus ). Rostrum lacking lateral carinae or feebly carinate; scape not reaching hind margin of eyes; elytra short (LE/WE 1.25-1.45), convex, lacking humeri or with vestigial humeri, densely covered with erect to suberect setae; profemora equal to or slightly broader than metafemora; mucro small, only present on protibia, except in some males; penis body equal to or slightly shorter than the apodemes.

Description. Species relatively small for the tribe Naupactini (females 5.5–8.3 mm; males 5.0– 7.9 mm), covered by brown or grey scaly vestiture, with characteristic pattern of maculations on pronotum and elytra ( Figs. 1–8 , 11, 14 ); some specimens uniformly grey or greenish ( Figs. 9–10, 12–13 ). Vestiture consisting of appressed round scales and fine, erect to suberect setae, distributed in 1–4 irregular lines along intervals of elytra; scaly vestiture scattered on legs, lacking on antennae and central line of abdomen.

Rostrum truncate conical (WF/WR 1.35–1.55× in female, 1.20–1.50× in males), about as long as wide at apex (LR/WR 0.95–1.05× in females; 1.00–1.15× in males); lateral carinae indistinct. Eyes round, feebly to strongly protruding; preocular impression usually indistinct; postocular constriction slight. Antennae short; scape not reaching hind margin of eyes; funicle segment 2, 1.0–2.0× as long as segment 1; funicle segments 3–7, usually 2.0–2.5× as long as wide at apex; club 1.9–2.6× as long as wide.

Pronotum subcylindrical or slightly truncate-conical; feebly to strongly punctate; base straight to slightly curved (WP/LP 1.30–1.35× in female, 1.25–1.55× in male). Elytra oval, very short, broader relative to pronotum in females (LE/WE 1.25–1.45×; LE/LP 2.25–2.60×; WE/WP 1.35–1.55×), narrower and longer in males (LE/WE 1.30–1.45×; LE/LP 2.05–2.30×; WE/WP 1.15–1.30×); base usually straight and thickened; humeri usually absent; apical declivity usually abrupt ( Figs. 7–8 ); punctures of striae of variable size; intervals flat, about 2–3× as wide as punctures. Metathoracic wings absent. Scutellum small, denuded or setose at apex. Legs short; profemora equal to or slightly wider than metafemora in females (PF/MF 1.00–1.20×), usually wider in males (F1/F3 1.10–1.45×); protibiae bearing small mucro and 7–9 denticles on inner margin; meso- and metatibiae lacking mucro and denticles (with small mucro in males of P. andersoni ); corbel of metatibia well-developed, squamose; dorsal comb about as long as distal comb. Ventrite 2 slightly longer than ventrites 3+4; ventrite 5 about same length as 3+ 4 in females and slightly longer in males.

Female terminalia ( Figs. 15–20 ). Sternite VIII ( Fig. 15 ) subrhomboidal, about as long as wide, with pair of subparallel more sclerotized lines along basal half; apodeme about 3.0-3.5× as long as plate. Ovipositor ( Fig. 16 ) slightly shorter than ventrites 1-5. Spermathecae ( Figs. 17–20 ) subcylindrical; collum truncate-conical; ramus indistinct; cornu shorter than spermathecal body. Spermathecal gland about 2× as long as spermatheca; spermathecal duct about 4–6× as long as spermatheca.

Male genitalia ( Figs. 21–25 ). Penis about as long as ventrites 1-5; penis body strongly curved, equal to slightly shorter than its apodemes, with semicircular ostium; apex tapered ( Fig. 25 ). Endophallus usually without sclerites.

Species included: Pantomorus albosignatus ( Figs. 1, 4, 7 ), P. parvulus ( Figs. 2, 5 ), P. andersoni sp. nov. ( Figs. 3, 6, 8 ) and P. crinitus ( Figs. 9–14 ).

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. 9–14. Pantomorus albosignatus species group, P. crinitus (Boheman), variation, dorsal views. 9, P. crinitus, lectotype female; 10, P. nobilis (Boheman) (=P. crinitus), lectotype female; 11, P. crinitus, female from Tapachula, Mexico; 12, P. affinis Sharp (=P. crinitus), lectotype male; 13, P. crinitus, male; 14, P. crinitus, male from Tapachula, Mexico. 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.