Pterostichus (Petrophilus) tuberifer Sasakawa

Sasakawa, Kôji & Kubota, Kôhei, 2006, Phylogenetic studies of the subgenus Petrophilus Chaudoir (Coleoptera: Carabidae: Pterostichus), with description of a new species sympatric with P. thunbergi Morawitz, Zootaxa 1357, pp. 31-43 : 36-37

Pterostichus (Petrophilus) tuberifer Sasakawa , sp. nov.

Figs 12–13 , 17–21

Pterostichus thunbergi (part): Tanaka, 1985: 110.

Pterostichus thunbergi (part): Kimoto & Yasuda, 1995: 280.

Diagnosis. Externally similar to small individuals of P. thunbergi , but easily distinguished from them by less punctate laterobasal impressions of the pronotum and the presence of a lobe on the middle dorsal surface of the endophallus.

Description. Length of body: ɗ, 11.4–13.9 mm (mean ± SD: 12.3 ± 0.51 mm) n=20; Ψ, 11.9–14.2 mm (mean ± SD: 12.6 ± 0.79 mm) n=12. Dorsal surface of the body black and shiny without metallic luster ( Figs 17–18 ). Legs reddish to dark brown.

Head of normal size; mandible with surface grooved; submentum with 2 pairs of setae. Pronotum cordate; surface smooth except for laterobasal impressions; laterobasal impressions weakly wrinkled and sometimes slightly punctuate; hind angle obtuse, without a denticulate tooth. Elytra oblong; shoulders distinct but not denticulate; scutellar stria present but not connected to stria 1; 1 dorsal pore at the anterior end of stria 1; 3 dorsal pores on interval 3; apices of elytra simple, not denticulate. Ventral side almost smooth.

Aedeagus without a conspicuous tubercle, bent at about 90 degrees at the basal third ( Fig. 19 ); apical part narrowly rounded on dorsal view ( Fig. 20 ); membranous part near the ostium not lobate, but slightly sclerotized around the left dorsolateral surface near the ostium. Right paramere slender, bent at about 90 degrees at almost the basal half ( Fig. 21 ); left paramere wide, square. Endophallus ( Figs 12–13 ) large, strongly bent ventrally, but not in touch with the ventral surface of the aedeagus; middle dorsal surface lobate; 3 lobes on the left side near the gonopore, one on the ventrolateral surface, one on the lateral surface, and one on the dorsolateral surface; right ventrolateral surface near gonopore with a small and weakly sclerotized lobe; transverse pigmentation on the ventral surface; gonopore weakly sclerotized, without a gonoporal piece.

Vagina without conspicuous pigmentation; spermatheca elongate, with the basal part distinctly pigmented; apical part of the spermatheca strongly bent at the part connected with the spermathecal gland; stylomere long and stout, with 1 seta on the medial side; lateral side of the stylomere with 2 setae; stylomere apex with 2 nematiform setae.

Holotype. ɗ, Mt. Hirayama, Shirataki-mura, Hokkaido, Japan, 6–14. vii. 2003, H. Matsumoto leg., ( FZUT 0013) [ FZUT].

Paratypes. 16ɗɗ9ΨΨ, same data as holotype; 3ɗɗ3ΨΨ, Akisato-ikku, Okoppe-chô, Hokkaido, 1–2. viii. 2004, K. Sasakawa leg. [ FZUT and NHML].

Etymology. The specific name derives from the Latin noun tuber, -eris, n (a swelling, protuberance) and the Latin adjectival suffix -fer, -fera, -ferum (bearing). It refers to the lobe on the middle dorsal surface of the endophallus.

Figures

FIGURES 8 – 15. Endophalli of Petrophilus (8 – 13) and outgroup species (14, 15) (left lateral view, right lateral view). 8. P. j u n g e n s; 9. P. m a i c h e n s i s; 10. P. thunbergi (Ônuma-kôen); 11. P. thunbergi (Mt. Hirayama); 12. P. tuberifer (Mt. Hirayama); 13. P. tuberifer (Akisato-ikku); 14. P. creper; 15. P. vermiculosus. Numbers in square brackets indicate characters in Appendix 1. Scale: 1.0 mm.

FIGURES 17 – 18. Habitus of Pterostichus (Petrophilus) tuberifer Sasakawa, sp. nov. 17. Holotype, male; 18. Paratype, female. Scale: 2.5 mm.

FIGURES 19 – 21. Male genitalia of Pterostichus (Petrophilus) tuberifer Sasakawa, sp. nov. 19. Aedeagus, left lateral view; 20. Apex of aedeagus, dorsal view; 21. Right paramere, left lateral view. Scale: 1.0 mm.