Akalyptoischion chandleri Andrews

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 : 19-20

Akalyptoischion chandleri Andrews

( Fig. 14 , 47 )

Akalyptoischion chandleri Andrews 1976 a: 7

Description. Length 1.10–1.25 mm. Width 0.35–0.40 mm. Body elongate, subparallel, uniformly light brown to dark brown; uniformly setose, setae short; head narrower than pronotum by size of one eye facet, sides slightly sinuate; clypeus narrowing gradually at less than 45u angle anterior to antennal insertions; head foveae distinct, elongate ovals, slightly smaller than eyes; head setation dense, setae short and decumbent; head punctation dense, apparent on pointmounted specimen, surface rugose; eyes large and prominent with 3–4 facets; tempora lacking; hind angles 90u; clypeal fovea length of antennomere III, 0.6 times width of labrum; labrum anterior margin slightly emarginate; mandible apex pointed with one apical tooth and 3–4 sharp subapical serrations, prostheca long; antennae with a 2-segmented club, antennae reach posterior 1/3 of pronotum; antennomere I wider than long, a slightly irregular oval, II elongate, egg-shaped, narrowing slightly apically, III small, elongate, parallel sided, IV subequal to III, elongate, sides arcuate, V–VIII submonilliform, IX slightly larger than VIII, globular, X–XI form club, X large, parallel sided, XI larger than X, elongate, subrectangular.

Pronotum widest anteriorly, anterior angles rounded, lateral margin arcuate, converging slightly posteriorly; lateral margin slightly explanate with,12 small, indistinct tubercles each bearing a short, decumbent seta; median 3/5 raised with uniform short, decumbent setae; pronotal foveae shallow and indistinct, anterior pair transverse, posterior pair broad ovals; pronotal punctation dense.

Elytra subparallel, widest anteriorly, lateral flange nearly lacking; 6 striae; humeral angle a small but sharp lobe; strial interspaces 3 and 5 very slightly raised; short decumbent setae present on all interspaces and lateral margin; epipleuron complete, narrowing posterorly.

Ventral surface uniformly setose, submental fovea length of antennomere II with few large punctures and scattered micropunctures; ventral head punctation even but sparser at midline; gular punctation uniform; prosternal punctation uniform; mesosternum without sharp carinae; metasternum with a single round fovea between mesocoxae, a large transverse fovea posterior to each mesocoxa, a large, deep arcuate fovea anterior to each metacoxa, and median surface with few scattered punctures; abdominal ventrite I with 2 round or slightly irregular foveae at anterior corners of intercoxal process, a large, deep fovea equal in size to metacoxa posterior to each metacoxa, and median surface without punctures; ventrites II–IV unmodified.

Material Examined. HOLOTYPE, USA: label data: ‘‘ Mt. Lemon Hwy 7,6009 Pima Co. Ariz. x-3-1971 DS Chandler colr,’’ ‘‘ Berlese Oak duff’’ ( CDAE).

PARATYPES, USA, same data as holotype, 1 on slide (3, CDAE) .

Additional Material , ‘‘ Bear Cyn. Ariz. on Mt. Lemon Hwy. Pima Co. X-3-1971 5,6009 DS Chandler,’’ ‘‘ Berlese Sycamore duff’’ (2, CDAE) ; ‘‘ Arizona: Santa Rita Mts. Box Cyn. Jan. 17 1969,’’ 1 on slide (4, CDAE) : ‘‘ April 7 1968 ’’ (1, CDAE) : ‘‘ Nov. 17 1968 ’’ (3, CDAE) ; ‘‘ Madera Cyn. , Ariz Sta. Cruz Co. XI-20-1971 DS Chandler colr,’’ ‘‘ Berlese Sycamore duff,’’ 1 on slide (4, UCDC) .

Remarks. This species resembles A. sleeperi and A. leptosoma . It may be distinguished from A. sleeperi by its much shorter elytral setae that are appressed to the body. The setation of A. leptosoma is visible only under high magnification (100 3), whereas A. chandleri has clearly visible setae under lower magnification (10 3).

Figures

Figs. 12–16. 12) A. hadromorphus, male, pronotum outline; 13) A. lasiosus, male, pronotum outline; 14) A. chandleri, elytra, dorsolateral view, diagrammatic; 15) A. tomeus, elytra, dorsolateral view, diagrammatic; 16) A. echinos, elytra, dorsolateral view, diagrammatic.

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.