Carcinops kumeyaay Reese and Swanson, 2017

Reese, Ellen M. & Swanson, Alexander P., 2017, A Review of the CactophilicCarcinopsMarseul (Coleoptera: Histeridae) of the Sonoran Desert Region, with Descriptions of Six New Species, The Coleopterists Bulletin 71 (1), pp. 159-190 : 179-180

Carcinops kumeyaay Reese and Swanson , new species

( Figs. 10G , 20 )

Type Series. HOLOTYPE. Female. “ USA: CA. Anza-Borrego Desert State Park , 33.099932°N 116.465996°W, sea level, 12. IV.2014, ex. necrotic Ferocactus cylindraceus, E. Reese ” ( FMNH, 1) . PARATYPES. 3 specimens. Same data as holotype ( FMNH, 1; CASC, 1; EMR, 1; DNA vouchers: EMR551 , EMR557 ) .

Diagnosis. This species is recognized by the following combination of characters: Head: Frontal stria terminating at clypeolabral suture ( Fig. 3B ); marginal epistomal stria absent. Pronotum: Marginal stria very close to anterior margin ( Fig. 3A ). Elytra: Dorsal stria 5 and sutural stria subequal in length to dorsal striae 1–4, reaching or nearly reaching proximal base of elytra ( Fig. 7 ); subhumeral striae present with external subhumeral striae often reduced to rows of punctures. First abdominal ventrite: One stria present, smooth surface texture ( Fig. 2A ).

Description. L: 1.60 mm; W: 1.12 mm; E/Pn L: 1.67; E/Pn W: 1.08; Pn W/L: 0.93; E L/W: 0.89; Sterna: 0.50, 0.18, 0.54 mm. Form oval, moderately depressed; color black to rufous, shiny; frons slightly convex, coarsely, densely punctate; frontal stria interrupted anteromedially, extending anterad just beyond antennal insertion to clypeolabral suture; marginal epistomal stria absent.

Pronotum marginally convex, widest at base, converging anteriorly, sides gently curving; anterior angles acute, projecting; pronotal marginal stria complete to base, parallel and very close to anterior margin; pronotal disc coarsely densely puncate throughout; antescutellar puncture round and strongly impressed.

Prosternal lobe coarsely, densely punctate anteriorly; prosternal keel slightly convex posteriorly, carinal striae slightly inwardly arcuate, united posteriorly.

Elytra finely, densely punctate with coarse punctures densely distributed along apical margins and extending basad to about apical half, external subhumeral stria strongly impressed, 0.3 mm long, centered on elytral midpoint; internal subhumeral stria strongly impressed along entire length of elytra except for a small section near apical third, where it is represented only by a puncture; 1 st –4 th dorsal striae complete, strongly impressed, punctate at regular intervals; 5 th dorsal and sutural striae represented by dense rows of strong punctures apically, fading basad but nearly reaching elytral base where 5 th dorsal stria curves slightly inward.

Mesosternum coarsely, densely punctate with fine punctures interspersed, coarse punctures present throughout intercoxal disc except for along lateral midline; anterior margin slightly emarginate to receive posterior prosternal projection; marginal stria complete, deeply impressed, continuous with lateral metasternal stria; mesometasternal suture represented by a fine line; intercoxal disc of metasternum coarsely, densely punctate throughout; lateral metasternal stria straight, strongly impressed, nearly reaching outer margin of metacoxal cavity; posterior mesocoxal stria diverging from lateral metasternal, about as long as lateral metasternal stria; lateral disc coarsely, densely punctate.

Intercoxal disc of 1 st abdominal ventrite coarsely, moderately punctate throughout, bistriate on each side medial to metacoxal cavity; lateral disc coarsely, densely punctate throughout, bearing a single stria along outer margin.

Outer margin of protibia bidentate in distal half; denticles rounded, not projecting much beyond tibial margin; outer margin of mesotibia tridentate with 2 denticles inserted near tibial apex and 3 rd inserted at midpoint of outer margin; outer margin of metatibia bidentate, both denticles inserted near tibial apex.

All collected C. kumeyaay specimens thus far have been female, therefore, aedeagus morphology is unavailable at this time. COI data for the species is available on Genbank (vouchers EMR549

and EMR551). If male specimens are collected in the future, their species can be verified via COI sequences, and the aedeagal morphology can be described.

Comparison with Related Species. Morphologically, C. kumeyaay resembles C. torquatus , as both have frontal striae reaching the clypeolabral suture, 5 th and sutural elytral striae reaching the elytral base, and a single stria on the lateral disc of their first visible abdominal sterna. Carcinops kumeyaay can be distinguished from C. torquatus by its non-sinuate pronotal marginal stria. Based on COI genetic data, this species is sister to C. consors and can be distinguished by its longer 5 th and sutural elytral striae and lack of a secondary stria on the lateral disc of the first abdominal ventrite.

Geographic Distribution and Natural History. Currently, C. kumeyaay is only known to inhabit necroses of F. cylindraceus in the Anza-Borrego Desert.

Derivation of Specific Epithet. Carcinops kumeyaay is named for the Kumeyaay (“KOOMyai”) natives, a group of people whose ancestral territory included what is now Anza-Borrego Desert State Park. The name is a noun in apposition.

Figures

Fig. 10. Dorsal photographs showing head and pronotal morphology of Carcinops species. A) C. consors, B) C. gilensis, C) C. corticalis, D) C. papagoanus, E) C. curtus, F) C. yaqui, G) C. kumeyaay, H) C. opuntiae. Photographs by E. Reese.

Fig. 20. Carcinops kumeyaay morphology. A) Dorsal view, B) Ventral view. Photographs by E. Reese.

Figs. 3–6. Head morphology of Carcinops kumeyaay, with arrows showing key character states: 3) C. kumeyaay; 4) C. corticalis; 5) C. curtus. Photographs by E. Reese. 6) Ground punctation patterns on the pronotum of species in the subgenus Carcinopsida (Carcinops wenzeli). Photograph by A. Swanson.

Figs. 7–8. 7) Long elytral striae highlighted on Carcinops kumeyaay; 8) Short fifth and sutural elytral striae highlighted on Carcinops yaqui. Photographs by E. Reese.

Fig. 2. Variation of the lateral disc of the first abdominal ventrite in Carcinops species. A) Single stria present (C. torquatus), B) Single stria with microsculptures present (C. rugulus), C) Bistriate (C. consors), D) Bistriate (C. yaqui), E) Tristriate (C. wenzeli). Photographs by A. Swanson.