Ixalma mindanaoensis, Legalov, 2024

Legalov, Andrei A., 2024, A new species of the genus Ixalma Pascoe, 1871 (Coleoptera: Curculionidae) from the Philippines, Ecologica Montenegrina 72, pp. 6-10 : 8-9

Ixalma mindanaoensis sp. n. ( Fig. 2 )

https://zoobank.org/ urn:lsid:zoobank.org:act:C7AB8FD7-21F9-4EEA-B959-7542B44BA434

Type material: Holotype, female ( ISEA), Philippines, Mindanao , Suriago del Sur Prov., Lingig, Bugak , VII.2018 ; Paratypes: female ( MCSN), Philippines, Surigao del Norte Prov., Siargao Isl. , “Cabunbug, C. Boettcher”, “Museo Genova, Coll. Angelo Solari ”; female ( ISEA), Philippines, Mindanao , Lanao del Sur Prov., Wao , I.2022 .

Description. Female: Body from red to reddish-brown, covered with curved light setae. Rostrum quite short, 0.5-0.7 times as long as pronotum, 1.6-2.3 times as long as wide at apex, 1.7-2.4 times as long as wide at midlength, 1.7-2.4 times as long as wide at base, slightly curved, apically glabrous, subcylindrical. Eyes large, convex, finely faceted. Forehead quite wide, 0.8 times as narrow as rostrum base width, flattened, densely punctate. Temples long, equal to length of eye. Vertex densely punctate. Antennae geniculate, inserted laterally into rostrum, near middle. First antennomere long, 6.0 times as long as wide at apex, almost reaching base of eyes. Second antennomere conical, 2.0 times as long as wide at apex, about 0.3 times as long as and about 0.9 times as narrow as first antennomere. Third to seventh antennomeres long-conical. Third antennomere about 2.3 times as long as wide at apex, slightly shorter and narrower than second antennomere. Fourth antennomere subequal to third antennomere. Fifth antennomere 2.0 times as long as wide at apex, slightly shorter and equal in width to fourth antennomere. Sixth antennomere equal to fifth antennomere. Seventh antennomere about 1.6 times as long as wide at apex, slightly longer and slightly wider than sixth antennomere. Eighth antennomere conical, about 1.6 times as long as wide at apex, slightly longer and slightly wider than seventh antennomere. Antennal club noncompact. Ninth antennomere about 1.1 times as long as wide at apex, slightly longer and about 1.6 times as wide as eighth antennomere. Tenth antennomere subequal to ninth antennomere. Eleventh antennomere about 1.8 times as long as wide at base, about 1.4 times as long as and slightly narrower than tenth antennomere. Pronotum campanulate, constricted behind apex and before base, 1.2-1.4 times as long as wide at apex, 0.9-1.0 times as long as wide at midlength, 0.8- 0.9 times as long at pronotal base, considerably narrower than elytra. Pronotal disk convex dorsally, densely transverse-rugose. Scutellar shield trapezoid, about 0.6 times as long as wide in middle. Elytra 1.4-1.6 times as long as wide at base, 1.4-1.5 times as long as wide at midlength, 1.7-1.8 times as long as wide at apical fourth, 2.9-3.3 times as long as pronotum. Humeri convex. Elytral striae distinct. Interstriae convex, wider than striae, densely granulate. Third and fifth elytral interstriae not tuberculated. Prosternum punctate. Pre- and postcoxal portions of prosternum short. Precoxal portion about 0.4 times as long as length of procoxal cavity. Procoxal cavities contiguous. Postcoxal portion about 0.9 times as long as procoxal cavity. Mesocoxal cavities widely separated. Metanepisternum about 7.3 times as long as wide in middle. Metaventrite quite short, 1.3-1.4 times as long as metacoxal cavity length, convex, finely punctate. Abdomen convex ventrally, sparsely rugose-punctate. First ventrite 0.5- 0.6 times as long as metacoxal length. Second ventrite about 1.3 times as long as first ventrite. Third ventrite 0.8-0.9 times as long as second ventrite. Posterior margin of second-fourth ventrites distinctly curved posteriad on lateral sides. Fourth ventrite slightly shorter than third ventrite. Fifth ventrite 1.4- 1.5 times as long as fourth ventrite. Pygidium covered by elytra. Procoxae conical. Metacoxae transverse. Femora large and thickened, dentate. Pro- and mesofemora each with an obtuse tooth and two subsidiary denticles externally. Metafomora dilated, extend significantly beyond apex of abdomen. Pectinate tooth of metafemora with eight to nine denticles. Pro- and mesotibiae biconcave and uncinate. Metatibiae curved with rounded inner apical edge. Tarsi long. First tarsomere long-conical. Second tarsomere conical. Third tarsomere bilobed. Fifth tarsomere elongate. Tarsal claws divergent and dentate. Total body length (without rostrum) 4.5-4.9 mm. Length of rostrum 0.5-0.6 mm.

Differential diagnosis. The new species is similar to Ixalma javanica from Java ( Indonesia) but differs in a shorter rostrum and non-tuberculated third and fifth elytral interstriae.

Etymology. From Mindanao Island.

Localisation. Philippines: Mindanao ( Suriago del Sur , Surigao del Norte and Lanao del Sur).

Figures

Figure 2. Ixalma mindanaoensis sp. n., female, habitus: a – holotype, dorsal view; b – holotype, ventral view; c – paratype, dorsal view. Scale bar = 1.0 mm.