Pachyrhynchus rukmaneae, Barševskis, 2016

Barševskis, Arvīds, 2016, New Species Of Pachyrhynchus Germar, 1824 And M Acro Cyrtus H Eller, 1912 (C Oleop Tera: Curculionidae) From The Marinduque Island (Philippines) As A New Example Of Mimetic Species Pair, Acta Biologica Universitatis Daugavpiliensis 16 (1), pp. 1-6 : 2-4

Pachyrhynchus rukmaneae sp. n.

( Fig. 1 , 3 )

Type material. Holotype, male: Philippines: Marinduque Isl., Boac , 06.2014, local collector leg. ( Fig. 1A,B ) . Paratypes: 1 male, 1 female: Philippines: Marinduque Isl., Boac, 08.2014, local collector leg .; 1 male: Marinduque Isl., Buenavista, 06.2012, local collector leg .; 1 male, 1 female: same data, 03.2014, local collector leg .; 4 males, 5 females: 05. 2014, local collector leg.; 2 females: same data, 07.2015, local collector leg .; 2 males, 3 females: same data, 11. 2015, local collector leg .; 1 female: Marinduque Isl., Mt. Malindig , 06.2012, local collector leg .; 1 female: same data, 03.2015, local collector leg .; 1 male: same data, 05.2015, local collector leg .; 1 male: same data, 06.2015, local collector leg .

Distribution: Philippines: Marinduque Isl.

( Fig. 3 ).

Description. Measurements (mm): Length of body: 12.2–14.8; width of body: 5.1–6.7, length of rostrum: 1.9–2.5, width of rostrum: 1.7–2.0, length of pronotum: 3.3–3.8, width of pronotum: 3.2–3.6, length of elytra: 7.0–8.5, width of elytra: 5.1–6.7.

Body, antennae and legs black, slightly glossy; puncturation of body fine;body with spots and elongated lines of greenish, greenish - pink or pink scales. Underside of body with spots of metallic greenish scales.

Head black. Eyes black, relatively small, slightly flattened. Head smooth, with small punctuation, without scales. Lateral sides of rostrum of some specimens covered with rudimental spot of small oval or elongate pale and greenish scales. Rostrum with shallow basal impression, weakly bulging in apical part. Apical bulge of rostrum flattened dorsally, slightly impressed in middle. Dorsal part of rostrum interrupted by indistinct transverse groove. Rostrum without dorsal pubescence, covered by brown sparse apical setae. Antennal scape relatively short, large and strongly clavate; remaining antennomeres small, with sparse very short pubescence and some long setae; apical antennomeres club-shaped, subellipsoidal.

Pronotum subspherical, with maximal width behind middle, 1.03 times wider than long, with very fine and sparse punctation.. Lateral sides of pronotum with band of greenish scales, with transverse interrupted band of greenish scales near frontal margin. Basal portion of pronotum with elongated subtriangular spot of greenish scales. Holotype with pronotum without transverse interrupted band near frontal margin, withvery small, rudimentar basal subtriangular spot.

Scutellum very small, rounded apically, from above practically not visible.

Elytra 1.4 times longer as wide. Elytral intervals smooth, with very fine punctures in slightly impressed rows. Elytral portion under scales of markings with fine punctures, microsculpture and very fine pubescence. Each elytron with five elongated pink or greenish-pink bands: four bands extending from basic to apical part of elytra and fifth presutural band shortened; first and fourth bands connected or very close together with small interruption.

Legs thick, with strongly clavate femori; tibiae serrate along internal margins, strongly incurved apically. Apical part of femori with irregular greenish scaly spot. Tibiae sparsely minutely pubescent, with long hairs along internal margin, sparsely mingled with stout hairs. Tarsomeres with sparse and pale pubescence.

Aedeagus as in Fig. 1C .

Differential diagnosis. Pachyrhynchus rukmaneae sp. n. is similar in general appearance to P. loheri Schultze, 1917 ( Fig. 2 ), which was described from the Luzon Island. However, P. rukmaneae sp. n. is easily distinguishable from P. loheri by the unique scaly markings on the prothorax. Lateral sides of pronotum of new species with band of greenish scales, with transverse interrupted band of greenish scales near frontal margin, with basal elongated subtriangular spot of greenish scales. Lateral sides of pronotum of P. loheri also with band of greenish scales and isolated round spot, with transverse relatively wide not interrupted band of greenish scales near frontal margin, andwith two basal symmetrically arranged transversely spots of greenish scales.

Etymology. This species is named after my colleague, researcher of the genus Pachyrhynchus Anita Rukmane (Daugavpils University, Daugavpils, Latvia), who discovered and described many new species of this genus.

Figures

Fig. 1. Pachyrhynchus rukmaneae sp. n. (A – habitus, dorsal view, B – habitus, lateral view, C – aedeagus (1 – lateral view, 2 – lamella, dorsal view)).

Fig. 3. Distribution of Pachyrhynchus rukma- neae sp. n. in Marinduque Isl.

Fig. 2. Pachyrhynchus loheri Schultze, 1917 (Schultze 1917).