Carcinops yaqui Reese and Swanson

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

publication ID 10.1649/0010-065X-71.1.159


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Carcinops yaqui Reese and Swanson

new species

Carcinops yaqui Reese and Swanson   , new species

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

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 View Figs ); marginal epistomal stria absent. Pronotum: Marginal stria moderately divergent from anterior edge along midline ( Fig. 4A View Figs ). Elytra: Dorsal stria 5 and sutural stria shorter than dorsal striae 1–4, terminating in basal third of elytra ( Fig. 8 View Figs ); subhumeral striae absent or reduced to rows of very faint punctures. First abdominal ventrite: Lateral disc bistriate ( Fig. 2D View Fig ). Aedeagus: Parameres straight, slightly spatulate, but tips terminating in acute point ( Fig. 9I View Fig ).

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 View Fig ).

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 View Fig ), whereas C. consors   has a secondary stria that diverges ventrally in its posterior fourth ( Fig. 2C View Fig ). 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 View Figs ).

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) GoogleMaps   . 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.


Universidad Nacional Autonoma de Mexico


Field Museum of Natural History


Louisiana State Arthropod Museum