Pediomorphus crenulatus Will, 2019

Will, Kipling, 2019, Taxonomic Review of the Australian Genus Pediomorphus Chaudoir, 1878 (Coleoptera: Carabidae: Abacetini), The Coleopterists Bulletin 73 (3), pp. 629-645 : 634-636

Pediomorphus crenulatus Will , new species

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( Figs. 7 , 16 , 19 , 26 )

Type Material. HOLOTYPE: Male. //“ NSW: ∼ 150 m North of bridge over Gingham Watercourse , South of Weemelah 29:13:30 S 149:16:04 E”// “ 26-Nov. to 16-Dec. 1999 [Dr. Lance] Wilkie, [Ms. Jaynia] Tarnawski, [Ms Helen] Doherty & [Dr. Helen] Smith, DRRP067/04 pitfall C. cristata remnant”// “K 175448”// “U.C. Berkeley EMEC705,231”// [deposited AMS].

Type Locality and Distribution Range. Only known from the location on the holotype label. This location is about 23 km south of Weemelah ( Fig. 19 ) at approximately 170 m elevation in habitat of Casuarina cristata Miq. (Casuarinaceae) . The pitfall traps that collected this specimen were on the “[e]ast side of road leading due South from Weemelah, approximately 150m North of bridge over Gingham Watercourse” (D. Smith, AMS, in litt.).

Diagnosis. Very similar in form to a small individual of P. planiusculus . The less dense, deeper, and larger punctures of the elytral striae in P. crenulatus distinguish it from P. planiusculus ( Figs. 15–16 ).

Description. Size: sbl = 5.1 mm; greatest width across elytra = 1.5 mm. Color: Dorsal and ventral surfaces brunneo-rufous, slightly infuscated on elytral disc; legs, mouthparts, and antennae concolorous with ventral surface. Dorsally distinctly and ventrally slightly shiny. Iridescence not evident dorsally, slight spectral iridescence on proepisterna, otherwise not evident on ventral surface of body. Head: Dorsal microsculpture not evident at 50X magnification. Clypeal-ocular impressions very divergent, broad, and shallow, poorly delimited laterally, not clearly delimited medially. Ocular ratio = 1.50. Eyes relatively small, prominent, with large posterior orbital area, single subocular carina low, sharply defined. Labrum with anterior margin slightly convex. Median tooth of mentum triangular, slightly flat across apex. Antennae moderately long, antennomeres 10–11 surpassing pronotal base. Thorax: Pronotum dorsally impunctate except for a few irregular, very small punctures near base in and around basal impressions and along basal margin; microsculpture not evident at 50X magnification, cordiform, widest well anteriad of middle, lateral margins distinctly sinuate in basal third. Lateral marginal bead narrow and widened just at hind angles; basal margin without marginal bead, somewhat irregular punctate; anterior angles not prominent, broadly rounded-triangular; hind angles obtuse, not denticulate; basal impressions linear, shallowly impressed, reaching basal margin. Seta at hind angle in marginal bead. Elytra parallel-sided, epipleura in dorsal view evidently sinuate at level of umbilicate marginal puncture 6. Elytral striae crenulate-punctate. Elytral microsculpture not evident at 50X magnification. Intervals flat except slightly convex in apical fifth. Elytral plica small. Prosternal process rounded, margined. Prosterna smooth. Meso- and metasterna coarsely punctate. Abdomen: Abdominal ventrites densely, finely punctate laterally and basally, impunctate medially and apically. Aedeagus: Medium lobe long and thin in lateral view, tip roundly acuminate in ventral view, no evident spines, fields, or spinules on endophallus in repose.

Etymology. The specific epithet is the Latin masculine nominative crenulatus , which is a reference to the relatively large punctures in the elytral striae that cause the striae to be crenulated in these beetles.

Figures

Figs. 7–10. Pediomorphus species, dorsal habitus. 7) P. crenulatus, holotype; 8) P. minor, holotype; 9) P. semilaevis, paratype; 10) P. punctatus, paratype. Scale bars = 1 mm.

Figs. 14–18. Pediomorphus species. P. planiusculus: 14) Labial palp; 15) Base of right elytron. P. crenulatus: 16) Base of right elytron. P. macleayi: 17) Head, showing large antennomere 1. P. robustus: 18) Ventral view of head, arrow indicating subocular carina.

Fig. 19. Localities of Pediomorphus species based on material examined and type localities.

Figs. 21–32. Pediomorphus species, aedeagi, left lateral view (A) and ventral view of tip (B). 21) P. planiusculus; 22) P. elongatus; 23) P. macleayi; 24) P. ruficollis; 25) P. variabilis; 26) P. crenulatus; 27) P. minor; 28) P. semilaevis; 29) P. punctatus; 30) P. robustus; 31) P. storeyi; 32) P. obtusus.