Carcinops yaqui 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 : 177-179

Carcinops yaqui Reese and Swanson , new species

( Figs. 2D , 9I , 10F , 19 )

Type Series. HOLOTYPE. Male. “ MEXICO: Sonora, Rancho San/ Pablo nr. Alamos, 27.07153°N / 108.71231°W, 530m, 1.VI.2007 / ex. necrotic Pilosocereus alensis / A. Swanson, APS143” ( UNAM; DNA voucher: APS143). PARATYPES. 5 specimens. Same data as holotype ( APS, 1; CASC, 1; FMNH, 1); MEXICO: Sonora, Arroyo Santa Barbara nr. Alamos, 27.09443°N 108.71266°W, 900m, 30.V. 2007, ex. necrotic Stenocereus montanus, A. Swanson ( CASC, 1; FMNH, 1; DNA voucher: APS 125); MEXICO: Puebla. near Las Bocas, November 2014, ex. necrotic Stenocereus thurberi, T. A. Markow ( FMNH, 2; CASC, 1; LSAM, 1).

Diagnosis. This species is recognized by the following combination of characters. Body: Ground punctation very fine and sparse. Head: Frontal stria terminating at clypeolabral suture ( Fig. 3B ); marginal epistomal stria absent. Pronotum: Marginal stria moderately divergent from anterior edge along midline ( Fig. 4A ). Elytra: Dorsal stria 5 and sutural stria shorter than dorsal striae 1–4, terminating in basal third of elytra ( Fig. 8 ); subhumeral striae absent or reduced to rows of very faint punctures. First abdominal ventrite: Lateral disc bistriate ( Fig. 2D ). Aedeagus: Parameres straight, slightly spatulate, but tips terminating in acute point ( Fig. 9I ).

Description. L: 2.17 mm; W: 1.60 mm; E/Pn L: 1.47; E/Pn W: 1.11; Pn W/L: 1.64; E L/W: 0.81; Sterna: 0.68, 0.27, 0.66 mm. Form oval, moderately depressed; color black to rufous, shiny. Frons slightly convex, finely, densely punctate; frontal stria interrupted anteromedially, extending anterad just beyond antennal insertion to clypeolabral suture, but strongly impressed throughout its length; marginal epistomal stria absent.

Pronotum convex, widest at base and converging anteriorly, sides gently curving; anterior angles acute, projecting; marginal stria complete, strongly impressed, about twice as distant from anterior margin of pronotum behind head than along interior margin of anterior angles; pronotal disc finely, moderately densely punctate medially with a narrow, arching band of coarse punctures extending from posterior to anterior corners; posterior margin rounded, marked by a row of coarse round punctures; antescutellar puncture round, strongly impressed.

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

Elytra finely moderately sparsely punctate, punctation more dense toward suture; coarse punctures confined to a narrow band along elytral apices, not extending basally beyond apical termini of dorsal and sutural striae; epipleuron coarsely punctate in apical half, marginal elytral stria arcuate, paralleling marginal epipleural stria before abruptly converging near apex, outer edge subcariniform; external and internal subhumeral striae generally absent, although external subhumeral may be represented by a row of several very faint punctures in some specimens; 1 st – 4 th dorsal striae complete, slightly inwardly arcuate, punctate at regular intervals; 5 th dorsal stria largely absent in basal third, though it may be extended basally by 2 or 3 faint punctures in some specimens; sutural striae similarly abbreviated such that a striation-free “window” is apparent across basomedial third of elytra.

Mesosternum finely, densely punctate; anterior margin posteriorly arcuate; marginal stria complete, strongly impressed laterally, more weakly impressed along anterior margin, continuous with lateral metasternal stria; mesometasternal suture represented by a fine line; intercoxal disc of metasternum finely, densely punctate, entirely free from coarse punctation; lateral metasternal stria straight, strongly impressed, nearly reaching outer margin of metacoxal cavity; posterior mesocoxal stria outwardly divergent, about 3/4 length of internal lateral, terminating well before external lateral metacoxal margin; lateral disc coarsely moderately densely and evenly punctate.

Propygidium coarsely, densely punctate with fine punctures interspersed; pygidium more finely punctate, a few coarse punctures scattered near base.

Intercoxal disc of 1 st abdominal ventrite finely, moderately densely punctate anteriorly, punctation thinning posteriorly, surface almost entirely glabrous in posterior third; bistriate on each side medial to metacoxal cavities; lateral disc coarsely, sparsely punctate, bearing a marginal stria and single, short, strongly impressed medial stria.

Outer margin of protibia bidentate in distal half, denticles rounded, deflexed, not projecting much beyond tibial margin; outer margin of mesotibia tridentate, with 2 denticles inserted near apex and 3 rd inserted just proximal to midpoint; outer margin of metatibia tridentate as in mesotibia, basal denticle strongly acute.

Parameres of aedeagus widened in middle, slightly spatulate but elongate toward tips, about ½ length of basal piece ( Fig. 9I ).

Comparison with Related Species. Carcinops yaqui is similar in appearance to C. consors , as both species possess two striae on the lateral discs of their first abdominal ventrite. The shape of the secondary stria, however, differs between the species. Carcinops yaqui has a relatively straight secondary stria ( Fig. 2D ), whereas C. consors has a secondary stria that diverges ventrally in its posterior fourth ( Fig. 2C ). Carcinops yaqui can also be distinguished from C. consors by its absence of subhumeral striae and the larger gap between its pronotal stria and the pronotal margin ( Fig. 4A ).

Geographic Distribution and Natural History. Carcinops yaqui is known from Sonora and Oaxaca, Mexico. Sonoran specimens were collected from the necroses of S. montanus , S. thurberi , and P. alensis . Oaxacan specimens collected by A. Newton are recorded as having been found on “rotting cacti columnar/ Opuntia .” Carcinops yaqui specimens have been absent from collections taken in Baja California Sur, Arizona, and southern California, indicating a likely more southern range than other species of cactophilic Carcinops in the Sonoran Desert.

Additional Material Examined. 3 specimens. MEXICO: Sonora: San Carlos , 27.9707°N 110.99825°W, sea level, 19.III.2007, ex. necrotic Stenocereus thurberi, A. Swanson ( APS, 1; DNA voucher: APS127 ) . Oaxaca: 5 mi. W Tequisistlán , 1100 ft, 23.VII-5.IX.1973, on rotting cacti, columnar/ Opuntia, A. Newton ( FMNH, 2; DNA voucher: EMR562 ) .

Derivation of Specific Epithet. Carcinops yaqui is named for the Yaqui (“YAH-kee”) natives of Sonora, Mexico. The name is a noun in apposition.

Figures

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.

Fig. 9. Aedeagal morphology of Carcinops species, with parameres toward the top of the page and basal pieces toward the bottom. A) C. consors, B) C. gilensis, C) C. corticalis, D) C. papagoanus, E) C. opuntiae, F) C. curtus, G) C. rugulus, H) C. torquatus, I) C. yaqui, J) C. wenzeli. Photographs by A. Swanson.

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. 19. Carcinops yaqui 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.