Akalyptoischion dyskritos Hartley, Andrews & McHugh, 2008

Hartley, Christopher S., Andrews, Fred G. & Mchugh, Joseph V., 2007, A Taxonomic Revision Of The Genus Akalyptoischion Andrews (Coleoptera: Latridiidae), The Coleopterists Bulletin (mo 6) 61, pp. 1-50 : 23-24

Akalyptoischion dyskritos Hartley, Andrews & McHugh new species ( Fig. 33 , 44 )

Etymology. Greek meaning ‘‘hard to determine’’ referring to its similarity to Akalyptoischion hadromorphus .

Description. 1.30–1.65 mm. Width 0.40–0.55 mm. Body elongate, subparallel, light brown to dark reddish brown; uniformly setose, setae long; head narrower than anterior pronotum and wider than posterior pronotum, sides slightly sinuate; clypeus narrowing slightly at less than 45u angle anterior to antennal insertions; head foveae oval, elongate, nearly size of eyes; head setation even, setae long and decumbent; head punctation even but sparse, surface rugose; eyes large and prominent with 4–5 facets; tempora size of one eye facet; hind angles sharp, nearly 90u; clypeal fovea short, length of antennomere V, 0.7 times width of labrum; labrum anterior margin not emarginate; mandible apex pointed with 5 or 6 teeth, apical tooth on lower plane; antennae with a 3-segmented club; antennae reach hind angles of pronotum; antennomere I irregular, wider than long, II elongate oval, III elongate, 2 times longer than wide, IV elongate, slightly longer than III, V–VII elongate, becoming shorter and rounder, VIII globular, IX–XI form loose club, IX elongate, conical, broadening apically, X subquadrate, XI longer than X, subrectangular.

Pronotum widest anteriorly; anterior angles rounded, slightly lobed apically, lateral margin arcuate, converging posteriorly with a sharp, 90u angle at posterior corners; lateral margin strongly explanate with,11 tubercles each bearing an erect seta; median 3/5 raised with long decumbent setae; pronotal foveae deep, transverse, reaching from lateral margin to base of raised area, anterior pair connected medially by a shallow furrow; pronotal punctation sparse, surface rugose.

Elytra subparallel, lateral flange apparent in anterior 1/2 only; 6 striae; humeral angle evenly rounded, scarcely lobed; interspace 3 raised, 5 sharply carinate; short decumbent setae present on all interspaces, interspaces 1, 3, 5, and lateral margin also with long erect setae; epipleuron complete, narrowing posteriorly.

Ventral surface evenly setose; submental fovea distinct, length of antennomere V with micropunctures; ventral head punctation sparse and only on lateral sides; gular punctuation dense, concentrated in a posterior band; prosternum evenly punctate; mesosternum without sharp carinae; metasternum with a small fovea between and posterior to each mesocoxa, a transverse, oval fovea anterior to each metacoxa, and median surface without punctures; ventrite I with 2 round foveae at anterior corners of intercoxal process, a transverse, oval fovea posterior to each metacoxa, median surface with 2 single punctures, widely separated, one below each coxa; ventrites II–IV unmodified.

Material Examined. HOLOTYPE, USA: label data: ‘‘ UTAH: San Juan Co., 8 mi. E Bluff 4,6009, IX-1984 to III-1985, D. Giuliani,’’ ‘‘Collected in Etylene glycol pit trap’’ ( CDAE).

PARATYPES, USA, same data as type, 1 on slide (4, CDAE) ; ‘‘ UTAH: San Juan Co., 8 mi. E Bluff 4,6009, IX-1984 to III-1985, D. Giuliani,’’ ‘‘Collected in Etylene glycol pit trap’’ (6, CDAE) ; ‘‘ UTAH: San Juan Co., 8 mi E Bluff III-1984 to IX-1984 4,6009, D. Giuliani’ ’ (2, CDAE) ; ‘‘ UTAH: San Juan Co., Bluff 4,6009 IX-84 to III-1985 D. Giuliani, Antifreeze pit trap’’ (2, CDAE) .

Additional Material, ‘‘ UTAH: Emery Co., 24 mi N, 3 mi E Hanksville, 6,0009 III to IX-1985, antifreeze pittrap, Derham Giuliani coll’’ (3, CDAE); UTAH: Emery Co. San Rafael Desert 32 mi N, 18 mi E Hanksville III-1984 to IX-1984, D. Giuliani 4,6009’’ (1, CDAE) .

Remarks. This species closely resembles A. hadromorphus in general appearance. Akalyptoischion dyskritos lacks erect setae on its head and has far fewer setae and punctures on its head and pronotum than A. hadromorphus . Also, the antennomeres, especially antennomere III, are shorter in A. dyskritos than in A. hadromorphus . Distribution can also separate these two species since A. dyskritos is limited to Utah, and A. hadromorphus is found in southern California. Akalyptoischion anasillos is also similar but can be distinguished by the long, erect setae on its head.

Figures

Figs. 30–35. Akalyptoischion spp. head, dorsal view, SEM. 30) A. atrichos; 31) A. giulianii; 32) A. hadromorphus; 33) A. dyskritos; 34) A. heterotrichos; 35) A. tomeus.

Figs. 42–47. Akalyptoischion spp. prothorax, dorsal view, SEM. 42) A. anasillos; 43) A. hadromorphus; 44) A. dyskritos; 45) A. giulianii; 46) A. sleeperi; 47) A. chandleri.