Pachyrhynchus congestus subsp. aedamlayroni Rukmane, 2019, subsp. nov.
Creators: name: Rukmane, Anita
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Pachyrhynchus
Pachyrhynchus congestus
Pachyrhynchus congestus ssp. aedamlayroni

description: Pachyrhynchus congestus ssp. aedamlayroni  subsp. nov.  
Fig. 1 E-F, 4C-D.  
 Type material. Male Holotype. ‘’ PHILIPPINES / Luzon, Ilocos, Adams / VIII. 2019 / local collector leg.’’ (white rectangular label, printed); ‘’ HOLOTYPE / Pachyrhynchys congestus ssp. aedamlayroni / Rukmane, 2019 / det. Rukmane A. 2019’’ (red rectangular label, printed).   
 Female. Paratype. ‘’ PHILIPPINES / Luzon, Ilocos, Adams / VII. 2019 / local collector leg.’’ (white rectangular label, printed); ‘’ PARATYPE / Pachyrhynchys congestus ssp. aedamlayroni / Rukmane, 2019 / det. Rukmane A. 2019’’ (red rectangular label, printed).   
 Distribution: Luzon Island, Ilocos Province.   
 Description. Male. Measurements (Holotype): LB: 13.3; LR: 1.9; WR: 2.0; LP: 4.8; WP: 3.9; LE: 8.7; WE: 5.9. Rostrum wider than long, LR/WR 1.05; pronotum longer than wide, LP/WP 1.23; elytra nearly 1.5 times longer than wide, LE/WE 1.47; elytra nearly two times as long as prothorax, LE/LP 1.81; elytra wider than peothorax, WE/WP 1.51. Body surface black, shiny, with pale green, orange and yellow markings. Dorsal habitus as shown in Fig. 1E. Prothorax with the following markings of round scales: 1) suboval dorso-lateral patch on each side; 2) basal subtriangular patch on middle of subbasal part; 3) two small round patches along apical margin, each redirected laterally. Each elytron with twelve ovate to elliptic patches of pale green round scales, each patch covered with line of orange, yellow or golden scales; patches may be isolated or confluent: 1) six patches on basal half, two smaller, redirected medially, four bigger, confluent, along basal ½ from interval I to lateral margin; 2) two sutural patches, one slightly after midline, one on apical ½; 3) three oval patches on apical ½, from interval II to lateral margin, confluent; 4) triangular patch near apex. Metasternum covered with round pale green to golden round scales; two patches on ventrite I, each redirected laterally; round patch of scales on each side of ventrite II. Aedeagus as illustrated in Fig. 4 C-D.   
Female. Measurements: LB: 14.7; LR: 2.1; WR: 2.2; LP: 4.9; WP: 4.4; LE: 9.9; WE: 7.0. Elytra wider than in male, more strongly convex. Dorsal habitus as shown in Fig. 1F.  
 Differential analyses. This species is delimitated from P.congestus ssp. congestus mainly by its unusual coloration and geographical isolation. Due to my research on genus Pachyrhynchus, such form of the current species is familiar only for Ilocos, Adams, and can’t be found on any other part of the Luzon Island.   
 Etymology. This species was named after Aedam Stephen Layron in appreciation of cooperation and possibility to study current material.
description: Published as part of Rukmane, Anita, 2019, Four new species and two subspecies of the genus Pachyrhynchus Germar, 1824 (Coleoptera: Curculionidae: Pachyrhynchini) from Luzon Island, Philippines, pp. 141-150 in Baltic Journal of Coleopterology 19 (2) on page 149, DOI: 10.5281/zenodo.12521148