Pachyrhynchus masatoshiensis, Rukmane-Bārbale, 2024

Rukmane-Bārbale, Anita, 2024, Four New Species Of Pachyrhynchini From Southern Luzon, Philippines (Coleoptera, Curculionidae, Entiminae), Acta Biologica Universitatis Daugavpiliensis 24 (2), pp. 349-358 : 350-353

Pachyrhynchus masatoshiensis sp. nov.

( Fig. 1 A-B; 3F, L; 4D, I)

Type material. Holotype, male ( Fig. 1A ): PHILIPPINES / Luzon, Bicol, Albay, Tabaco , Mt. / Mayon Volcano / IX. 2022 / local collector leg. (white printed label) // HOLOTYPE / Pachyrhynchus masatoshiensis / Rukmane-Barbale, 2024 (typed on red card).

Paratypes (4♀): 3♀ same data as holotype ; 1♀ PHILIPPINES / Luzon, Quezon, Gen Nakar / III. 2024 / local collector leg. The additional label: “ PARATYPE / Pachyrhynchus masatoshiensis / Rukmane-Barbale, 2024” (typed on red card) was added to all paratypes ( DUBC) .

Diagnosis. Pachyrhynchus masatoshiensis sp. nov. is similar to P. masatoshii Yoshitake & Yap, 2017 and P. rukmaneae Barševskis, 2016 . The new species can be distinguished by 1) thick band markings on prothorax, that lacks in both similar species: prothorax of P. masatoshii Yoshitake & Yap, 2017 is without markings ( Fig. 2 C-D) while prothorax of

Four new species of Pachyrhynchini from Southern Luzon, Philippines ( Coleoptera , Curculionidae , Entiminae )

P. rukmaneae Barševskis, 2016 is with narrow transverse band of scales along anterior margin and triangular shape band along posterior margin medially ( Fig. 2G, H, I ); 2) rostrum of P. masatoshiensis sp. nov. longer, with moderate bulge at apical half while without bulge in P. rukmaneae Barševskis, 2016 and smaller bulge in P. masatoshii Yoshitake & Yap, 2017 ( Fig. 3B, C, F ); 3) eyes ovate in P. masatoshiensis sp. nov. while globular in P. masatoshii Yoshitake & Yap, 2017 ( Fig. 3H, I, L ).

Description. Holotype. Male. Dimensions: LB: 13.0; LE: 8.7; LP: 4.0; WE: 5,8; WP: 3.9; LR: 2.2; WR: 1.9. N = 1.

Integument black, glossy, underside with weak- er luster. Body subovate, with glossy orange, green, yellow, pink and purple scales. Rostrum without scally patch dorsally, moderate patch of green, orange and yellow elongated scales on genae.

Prothorax with the following yellow to orange scales: 1) broad band of scales along anterior margin in all length; 2) large triangular medial patch along posterior margin, peak connected with anterior band; 3) large lateral patch at each lateroventral part. Each elytron with the following scale markings: 1) longitudinal band of pink scales along suture from middle to apex; 2) longitudinal band along interval II – III in all length, pink scales interrupted by purple scales in middle of band; 3) two additional longitudinal bands, each interrupted by gap from one another, redirected to lateral margin. Each femur with wide band of orange to yellow scales on subapical part.

Head smooth; forehead flattish, without medial furrow; more than two times as wide as eye width; eyes relatively small, slightly convex from outline of the head. Rostrum longer than wide (LR/WR 1.16); deep sub ovate impression at basal half; dorsum smooth, apical half moderately bulging; dorsal contour of rostrum nearly straight, incurved before middle, raised to apex; lateral contour with expressed apical bulge.

Antennal scape shorter than funicle; funicular segment 1.5 times as long as wide, longer than II; segment II 1.5 times as long as wide, moderately longer than III; segments III– VII subequal in length, as long as wide; club sub ellipsoidal, two times as long as wide.

Pronotum sub spherical, as wide as long (WP/ LP 1.02); dorsal contour widest just before the middle; lateral contour widest at middle; without sub basal groove, subapical groove interrupted at middle.

Elytra ovate (LE/WE 1.5), wider than prothorax (WE/WP 1.48), more than twice as long as prothorax, (LE/LP 2.18), smooth, without puncture rows; dorsal contour highest at middle; lateral contour widest at middle.

Male genitalia as illustrated ( Fig. 4D, I ).

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Anita Rukmane-Bārbale

Female. ( Fig. 1B ) Dimensions: LB: 13.3 - 15.6 (mean 14.37); LE: 9.2 - 11.0 (mean 9.95); LP: 3.8 - 4.6 (mean 4.1); WE: 7.4 - 7.8 (mean 7.62); WP: 3.9 - 4.3 (mean 4.12); LR: 2.0 - 2.1 (mean 2.075); WR: 1.9 - 2.0 (mean 1.95). N = 4.

Distribution. The new species is known from two provinces of Luzon Island: General Nakar, Quezon and Bicol, Albay.

Etymology. The species name masatoshiensis means false rukmaneae , due toits similarity to its P. masatoshii Yoshitake & Yap, 2017

Comments. The new species is relatively vari- able in colour and is proposed to be involved in mimicry complex with P. masatoshii Yoshitake & Yap, 2017 , P. yuukae Yoshitake, 2019 ( Fig. 2C, D, E, F ) and M. pseudojaysoni sp. nov.

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Four new species of Pachyrhynchini from Southern Luzon, Philippines ( Coleoptera , Curculionidae , Entiminae )

Figures

Figure 1. Pachyrhynchus masatoshiensis sp. nov. habitus of holotype, male (A), female (B); P. chrysocyaneus sp. nov. habitus of holotype, male (C), female (D). Image cour- tesy A. Rukmane-Bārbale.

Figure 2. Dorsal habitus of selected spe- cies: Pachyrhynchus caeruleus Yoshitake, 2019, male (A), female (B); P. masatoshii Yoshitake & Yap, 2017, male (C), female (D); P.yuukaeYoshitake, 2019, male (E), female (F); P. rukmaneae Barševskis, 2016, male (G), female (H), P. rukmaneae ssp. pauscignitus Yoshitake, 2017, male. Images courtesy A. Rukmane-Bārbale.

Figure 3. Head and rostrum in lateral and dor- sal view. Pachyrhynchus caeruleusYoshitake, 2019 (A, G); P. masatoshii Yoshitake & Yap. 2017 (B, H); P. rukmaneae Barševskis, 2016 (C, I); P. yuukae Yoshitake, 2019 (D, J); P. chrysocyaneus sp. nov. (E, K); P. pseudorukmaneaesp. nov. (F, L). Images courtesy A. Rukmane-Bārbale.

Figure 4. Aedeagus of selected species. Pachyrhynchus caeruleus Yoshitake, 2019 (A, F); P. masatoshii Yoshitake & Yap, 2017 (B, G); P. chrysocyaneus sp. nov. (C, H); P. masatoshiensis sp. nov. (D, I); P. rukmaneae Barševskis, 2016 (E, J). Images courtesy A. Rukmane-Bārbale.