New and additional notes on the distribution of Pachyrhynchus möllendorffi Heller, 1899 (Coleoptera, Curculionidae), with description of a new subspecies from the Marinduque Island (Philippines) Author Rukmane, Anita Author Cabras, Analyn Anzano text Baltic Journal of Coleopterology 2018 2018-08-20 18 1 57 63 journal article 10.5281/zenodo.12520204 1407-8619 12520204 Pachyrhynchus möllendorffi marinduquanus subsp. nov. ( Fig. 1E, 1F , 3A , 4A ) Type material. Holotype , male: ‘’ PHILIPPINES , Marinduque Island , Buenavista , III. 2013 , local collector leg.’’ (white rectangular card, printed) ; ‘’ HOLOTYPE , Male , Pachyrhynchus möllendorffi marinduquanus , Rukmane & Cabras 2018 , det. Anita Rukmane , 2018’’ (red rectangular card, printed) ( DUBC ) . Paratypes : one female : Marinduque Island , Buenavista , IV. 2017 ; two females : Marinduque Island , Mt. Malinding , IX. 2017 . ( DUBC ) . Distribution: Marinduque Island. Description. Male. Measurements (n=1): LB: 11.80; LR: 1.70; WR: 1.55; LP: 3.40; WP: 4.05; LE: 6.80; WE: 4.75. Dorsal habitus as in Fig. 1E . Integument black, body surface very shiny except elytra and underside with weaker lustre. Body with metallic pale orange, yellow or pink markings of recumbent round scales. Head subglabrous. Rostrum in dorsal contour straight, narrowing in apical side and weakly bulging in base; slightly longer than wide, LR/WR: 1.1; finely punctured, with short light hairs on apical ½; triangular shape impression on median part of rostrum from medial line to subbasal part of rostrum; lateroventral parts thickly covered with general scales and long golden hairs from Fig.1: Dorsal habitus of A – P. möllendorffi (male); B - P. möllendorffi (female); C – P. möllendorffi marinduquanus (male); D - P. möllendorffi marinduquanus (female). Rukmane A, Cabras A. A. Fig.2. Dorsal and latteral habitus of P. möllendorffi type specimen from SMTD antennal scrobes to apex; large, irregularly shaped patch of metallic pale orange scales on genae. Head with fine punctation; forehead flat, more than two times as wide as width of eye; eyes relatively large, moderately convex from the dorsal contour of head. Prothorax wider than long, WP/LP: 1.19; widest just before middle; with following markings of recumbent scales: 1) two longitudinal lines on disc, from lateral side of basal margin, to middle of apical margin, lines expands in apical part, forming triangle; 2) continuous transverse line along apical, lateroventral and basal margins of pronotum, from middle of apical margin to lateral side of basal margin, transverse line connects with longitudinal line on disc; elytra suboval, LE/WE: 1.43, almost same width as prothorax, WE/WP: 1.17, as twice as long as prothorax, LE/LP: 2; intervals very weakly pronounced; scutellum large, extruded; elytra widest just in the middle; each elytron with the following markings: 1) continuous line along basal and lateral margin, from middle of basal margin to interval III on apex; 2) longitudinal line along interval III from base to apex; 3) longitudinal line along interval VII from base to midline of elytron, after which line incurves and connects with line along interval III in apical 1/3; 4) transverse line medially from middle to lateral margin; 5) two short longitudinal lines in subapical part on interval I and II; profemur covered with general scales near apex, meso and meta femur covered with general scales both near apex and in basal part. Aedeagus as in Fig. 3A , 4A . Fig.3. Latteral view of male aedegal body, A - P. möllendorffi marinduquanus ; B - P. möllendorffi möllendorffi Female: Measurements (n=3): LB: 12.3 – 12.8 (mean 12.5). LR: 1.6 – 1.8 (mean 1.7). WR: 1.55 – 1.6 (mean 1.58). LP: 3.15 – 3.25 (mean 3.2). WP: 3.75 – 3.9 (mean 3.82). LE: 7.0 – 7.3 (mean 7.17). WE: 5.35 – 5.7 (mean 5.52). Habitus as in Fig. 1F . Differential diagnosis. Pachyrhynchus möllendorffi marinduquanus subsp.n. differs from P. möllendorffi möllendorffi by wider forehead, smaller eyes, shape of rostrum (rostrum of P. möllendorffi möllendorffi expands from midline to basal 1/ 3 in dorsal view, in P. möllendorffi marinduquanus it is straight, narrow on apex and expands on base), wider pronotum, with apical margin folded in middle (pronotum of P. möllendorffi möllendorffi is more narrow, apical margin straight). Etymology. The subspecific epithet is an adjective from the name of the island ( Marinduque ), where the subspecies was discovered.. Discussion. Marinduque and Panay are two separate islands belonging to two PAICs. While Rukmane A, Cabras A. A. Fig.4. Dorsal view of male aedegal body, A - P. möllendorffi marinduquanus ; B - P. möllendorffi möllendorffi Marinduque is a part of the Greater Luzon PAIC, Panay is a part of Greater Negros-Panay PAIC. These two islands were not connected by land bridges during the fluctuations of the seal level (Siler et al., 2010) which could have given rise to the speciation of the P. möllendorffi when these two islands became isolated. The isolation of these two islands could have caused biological isolation which led to subtle morphological differences between the population coming from the two islands. The morphological differences together with their geographical isolation as mentioned by Wallin et al. (2017) are valid evidence to consider P. möllendorffi marinduquanus as a new subspecies.