Pachyrhynchus chrysocyaneus, Rukmane-Bārbale, 2024
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publication ID |
https://doi.org/10.59893/abud.24(2).018 |
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persistent identifier |
https://treatment.plazi.org/id/C004D307-FFC9-FFFD-FF78-CFCBFECFFE4B |
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treatment provided by |
Felipe |
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scientific name |
Pachyrhynchus chrysocyaneus |
| status |
sp. nov. |
Pachyrhynchus chrysocyaneus sp. nov.
( Fig. 1C, D View Figure 1 ; 3E, K View Figure 3 ; 4C, H View Figure 4 )
Type material. Holotype, male ( Fig. 1C View Figure 1 ): PHILIPPINES / Luzon, Nueva Ecija, Gabaldon / VIII. 2023 / local collector leg. (white print- ed label) // HOLOTYPE / Pachyrhynchus chrysocyaneus / Rukmane-Barbale, 2024 (typed on red card).
Paratypes (2♀): Same data as holotype. The additional label: “ PARATYPE / Pachyrhynchus chrysocyaneus / Rukmane-Barbale, 2024” (typed on red card) was added to both paratypes ( DUBC) .
Diagnosis. The new species is similar to P. chlorites Chevrolat, 1881 from general Luzon, but is different by following characters: 1) black integument in P.chrysocyaneus sp. nov. but metallic purple to coppery in P. chlorites Chevrolat, 1881 ; 2) unique scally markings in P. chrysocyaneus sp. nov.; 3) rostrum with round impression at basal half in P.chrysocyaneus sp. nov. while with triangular impression in P. chlorites Chevrolat, 1881 .
Description. Holotype. Male. Dimensions: LB: 11.8; LE: 7.9; LP: 3.8; WE: 5.5; WP: 4.1; LR: 2.1; WR: 2.1. N = 1.
Integument black, glossy. Body subovate, with glossy green and blue scales. Rostrum dorsally without scally markings, each side with few light hairs on lateral part near apex, few single green and blue elongated scales on genae.
Prothorax with the following green scale markings: 1) two round patches along anterior margin, each redirected laterally; 2) one medial triangular patch along posterior margin; 3) ovate patch on each latero-ventral part.
Each elytron with the following green and blue scale markings: 1) two large ovate patches at basal ½, one dorsal, one redirected laterally; 2) three medial patches of blue scales, round- ed, sub-connected from interval II to lateral margin; 3) two sutural patches of green scales, rounded, one after the midline, one along apex; 4) three round patches of green scales at apical half. Fore coxae with band of scales along internal margin; tibiae with few brown hairs along internal margin, with rare black setae. Vertex with two lateral round patches along integument II and III.
Head smooth; forehead flattish, without furrow; eyes slightly convex from outline of the head, 2.5 times as wide as forehead. Rostrum equal in length and width (LR/WR 1.0); dorsum smooth, edges slightly rounded, without medial groove, with deep round impression at basal half, slightly bulging along apical half; dorsal contour of rostrum and forehead continuous, gradually increasing from forehead, slightly incurved along middle of rostrum, slightly raised to apex ( Fig. 3E, K View Figure 3 ).
Antennal scape flattened, subequal with funicle; funicular segment I 1.5 times as long as wide, slightly longer than II; segment II longer than wide, longer than III; segments III– VII subequal in length, slightly wider than long, gradually increasing to club, club sub ellipsoidal, two times as long as wide.
Pronotum subspherical, wider than long (WP/ LP 1.07); dorsum smooth, convex, without medial groove; dorsal contour widest before the middle; lateral contour widest before the middle; sub basal groove interrupted at middle, subapical groove indistinct.
Elytra ovate (LE/WE 1.43), wider than prothorax (WE/WP 1.34), two times longer than pronotum, (LE/LP 2.07), smooth, without expressed punctured rows; dorsal contour highest at middle; lateral contour widest at middle.
Male genitalia as illustrated ( Fig. 4C, H View Figure 4 ).
Female. Dimensions: LB: 12.0 – 12.8 (mean 12.4); LE: 8.0 – 8.6 (mean 8.3); LP: 3.8 – 4.0 (mean 3.9); WE: 6.0 – 6.7 (mean 6.35); WP: 3.6 – 4.1 (mean 3.85); LR: 2.1 – 2.2 (mean 2.15); WR: 2.0 – 2.2 (mean 2.1). N = 2. Elytra wider than prothorax (WE/WP 1.64) otherwise, essentially asi n males ( Fig. 1D View Figure 1 ).
Distribution. The new species is known only from type locality at Gabaldon Province, Luzon Island.
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Etymology. Pachyrhynchus chrysocyaneus – combining “chryso” for golden yellow and “cyaneus” for blue symbolising spots on elytra of the new species.
Comments. The new species is similar by colour pattern to P. yuukae Yoshitake, 2019 and M. jaysoni Bollino, 2023 which suggest their mimicry relationship.
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