Akalyptoischion atrichos Andrews, 1976

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 : 14-17

Akalyptoischion atrichos Andrews

( Figs. 2–6, 8 , 17 , 19–22 , 27–30, 36 )

Akalyptoischion atrichos Andrews 1976 a: 10

Description. Length 1.20–1.50 mm. Width 0.40–0.50 mm. Body elongate, subparallel, uniformly yellowish red or reddish brown to dark brown; glabrous. Head narrower than anterior pronotum by size of one eye facet, sides slightly sinuate, clypeus narrowing at 45u angle anterior to antennal insertions, clypeus densely setose; head foveae round, deep and distinct, size of eyes; head punctation very dense, conspicuous on point-mounted specimen, surface rugose; eyes large and prominent with 4 or 5 large facets; tempora size of one eye facet, hind angles oblique, greater than 90u; clypeal fovea length of antennomere III, 0.6 times width of labrum; labrum anterior margin very slightly emarginate; mandible apex pointed with 5 or 6 teeth, apical tooth on a lower plane, prostheca long; antennae with a 3-segmented club, antennae reach posterior 1/3 of pronotum; antennomere I irregular, wider than long, II elongate oval, III–VIII longer than wide, becoming progressively rounder, IX–XI form club, IX elongate, conical, widening apically, X trapezoidal, slightly wider than long, widening apically, XI parallel sided, elongate, trapezoidal.

Pronotum widest anteriorly; anterior angles rounded, lateral margin arcuate apically to parallel sided posteriorly; lateral margin explanate with,12 tubercles bearing microscopic setae; median 2/3 raised; anterior pronotal foveae narrow and transverse, connected medially by a shallow transverse depression, posterior pronotal foveae broad ovals; pronotal punctation very dense, surface rugose.

Elytra wide, subparallel, lateral flange visible in anterior 1/2; 6 striae; humeral angle slightly lobed; strial interspace 1 gently raised, interspaces 3 and 5 strongly carinate, all interspaces glabrous; epipleuron complete, narrowing posteriorly.

Ventral surface glabrous; submental fovea deep, length of antennomere III, with 4 or 5 large punctures and few micropunctures; ventral head punctation even but sparser at midline; gular punctation even; prosternum irregularly punctate; mesosternum without sharp carinae; metasternum with a single fovea between mesocoxae, a large irregularly shaped fovea posterior to each mesocoxa, a narrow, arcuate fovea anterior to each metacoxa, and median surface with very few scattered punctures; abdominal ventrite I with 2 distinct, circular foveae at anterior corners of intercoxal process, a transverse fovea posterior to each metacoxa, and a single puncture at midline that may be circular, geminate or irregular in shape; ventrites II–IV unmodified.

Material Examined. PARATYPES, USA: label data: ‘‘ Seven Oaks San Bernardino Co., Cal. I. 26.1963,’’ ‘‘ Berlesed from Dry Oak Duff,’’ ‘‘ I.M.Newell Coll.,’’ 1 on slide (4, CDAE) .

Additional Material, ‘‘CALIF: Riverside Co. Whitewater Canyon XII-27-1979 KW Cooper 79-129,’’ ‘‘berlese Neotoma nest at base of Prosopia,’’ 2 on slide (80, CDAE): ‘‘79-125’’ (1, CDAE): ‘‘79-124, Rhus Ovata litter’’ (21, CDAE): ‘‘ V-8-1977 berlese Rhus ovata litter,’’ ‘‘Fred G. Andrews K.W. Cooper Collectors (2, CDAE): ‘‘ IV-1-1977 Berlese-Neotoma nest K.W. Cooper’’ (2, CDAE); ‘‘CALIF: Riverside Co. Bautista Canyon 79-103 7.7 mi. SE Valle Vista VI-1-1979 KW Cooper,’’ ‘‘berlese Neotoma nest from exterior of fallen oak tree’’ (11, CDAE); ‘‘CALIF: Riverside Co. WhiteWater Canyon V-8-1977 berlese Rhus ovata litter,’’ ‘‘Fred G. Andrews K. W. Cooper Collectors’’ (115, CDAE); ‘‘CALIF: Riverside Co. 2 mi. SW Vail Lake II-14-1981 81-192 J.A. Moore berlese litter base of oak’’ (73. CDAE); ‘‘CALIF: San Bernardino Co. Redlands II-10-1980 KW Cooper 80-136,’’ ‘‘Berlesed from Neotoma nest’’ (97, CDAE); ‘‘CALIF: Riverside co. Vail Lake IV- 8-1980 KW Cooper & FG Andrews 80-155,’’ ‘‘berlese Neotoma nest at base of Quercus dumosa’’ (2, CDAE); ‘‘CALIF: Riverside Co. Bautista Canyon 7.9 mi. SE Valle Vista II-3-1980 KW Cooper 80-135,’’ ‘‘berlese litter under Adenostoma’’ (1, CDAE): ‘‘ 17 mi SE Valle Vista IV-30-1977 K.W. Cooper, coll.,’’ ‘‘Berlesed from Neotoma nest at base of oak and poison oak’’ (4, CDAE): 4 mi. SE Valle Vista XII- 16-1977 K.W. Cooper,’’ ‘‘berlesed from Quercus litter at base of Yucca’’ (3, CDAE): ‘‘ 2 mi. Se Valle Vista X-2-1978 JA Moore 78-85’’ (2, CDAE): ‘‘ 12 mi. SE Valle Vista XII-16-1978 KW Cooper 78-88,’’ ‘‘berlese Neotoma nest in stump of cottonwood’’ (4, CDAE): ‘‘ 17 mi. SE Valle Vista 1-13-1977 K.W.Cooper F.G.Andrews,’’ ‘‘77-10’’ (1, CDAE); ‘‘CALIF: Riverside Co. 11.4 mi. SW Palm Desert V-8-1977 Fred G. Andrews & K.W. Cooper,’’ ‘‘Berlesed from Neotoma lepida nest in rocks’’ (1, CDAE); ‘‘CALIF: San Bernardino Co., Mt. San Jacinto, Strawberry Ck., W. of Mt. Center IV-3-1977 K.W. Cooper, coll.,’’ ‘‘Berlesed from Neotoma nest at base of oak and poison oak’’ (6, CDAE); ‘‘CALIF: Riverside Co. Palm Canyon Agua Caliente Reservation IV-28-1978 78-67 K.W. Cooper,’’ ‘‘berlese litter at base of Washingtonia filifera’’ (51, CDAE): ‘‘Agua Caliente Reservation XII-17-1977 K.W. Cooper’’ (1, CDAE); ‘‘CALIF: Riverside Co 4 mi. SE Valle Vista II-1978 K. Cooper Oak litter 78-64’’ (5, CDAE): ‘‘ 12 mi SE Valle Vista 1-30-1977 K.W. Cooper, coll.,’’ ‘‘Oak tree hole’’ (4, CDAE): ‘‘ 12 mi SE Valle Vista 1-30-1977 K.W. Cooper, coll.,’’ ‘‘berlesed from Neotoma nest at base of Manzanita’’ (2, CDAE): ‘‘ 2 mi. S Valle Vista XI-29-1981 K.W. Cooper 81-213,’’ ‘‘berlese Neotoma nest in rocks under live oak’’ (1, CDAE): ‘‘ 2 mi. S Valle Vista XI-29-1981 K.W. Cooper 81-214 berlese oak litter’’ (1, CDAE); ‘‘CALIF: Riverside Co Bautista Canyon U.C. Reserve 78-58 III-17-78 J.Moore’’ (6, CDAE); ‘‘CALIF: Riverside Co. 2 mi SW Vail Lake IV-8-78 J.Moore Base of Oak 78-64’’ (4, CDAE); ‘‘CALIF: Riverside Co. Bautista Canyon 7.9 mi. SE Valley Vista II-3-1980 KW Cooper 80-132,’’ ‘‘berlese Neotoma nest at base of Rhus ovata’’ (5, CDAE); ‘‘CALIF: Riverside Co Palm Canyon VI-9-78 berlese palm litter K.W. Cooper 78- 79’’ (4, CDAE); CALIF., Riverside Co.. 5 mi S.E. Aguanga Chaparral Scrub El.2000 I-7-79 to XII-23-80 Rolf L. Aalbu col.,’’ ‘‘Ethylene Glycol Can Trap rocky hillside’’ (5, CDAE); ‘‘CALIF: Riverside Co. Vail Lake III-14-1983 J. A. Moore Oak litter 83-250’’ (1, CDAE); ‘‘CALIF: Riverside Co. 4.4 mi. SE Sage VI-4-1983 2,4009 K.W. Cooper 83-254,’’ ‘‘berlese Neotoma nest at base of Rhus ovata’’ (3, CDAE); ‘‘CALIF: SanBernardino Co., Wrightwood IV-15 1986 berlese Neotoma nest A.Hardy, Fred G. Andrews, T.D.Eichlin’’ (1, CDAE); ‘‘CALIF: Riverside Co. Bautista Cny XII-30-1988 F.G. Andrews Berlesed from Neotoma nest’’ (2, CDAE); ‘‘CALIF: San Bernardino Co. 2 mi. E Mentone V-15-1978 78-75 KW Cooper berlese Neotoma nest in alder’’ (1, CDAE); ‘‘Hemet 10 M E Riverside Co. Calif. 5- 5-1984 Fred G. Andrews,’’ ‘‘swallow nest,’’ 1 on slide (2, CDAE); CALIF: Riverside Co. Bautista Canyon 8 mi SE Valle Vista IV-10-1977 K.W. Cooper, coll.,’’ ‘‘Berlese Tree hole in oak’’ (1, CDAE); ‘‘CALIF: Inyo Co. Division Creek III-31-1981 D.giuliani antifreeze pit trap’’ (5, CDAE); ‘‘Cottonwood Cr. Inyo Co., Cal. X 1973,’’ ‘‘Golden Oak,’’ ‘‘Collector D. Giuliani’’ (1, CDAE); ‘‘CALIF: Inyo Co. George Ck., 6,5009 VI-11-1976 Berlese Quercus chrysolepis D. Giuliani , coll.’’ (1, CDAE); ‘‘N.Fork Oak Creek Inyo Co., Cal 6,0009 IX.1972,’’ ‘‘ex Black Oak duff,’’ ‘‘D. Giuliani collector,’’ 1 on slide (3, CDAE): ‘‘ II-27-1976,’’ ‘‘Berlesed from Quercus Kelloggii duff,’’ ‘‘D. Giuliani, Collector’’ (2, CDAE); ‘‘Angeles Crest Hwy 13.4 mi W Big Pine Ranger Sta L.A. Co., CALIF. VI.10.1957,’’ ‘‘I. M. Newell Coll.’’ (1, CDAE); ‘‘CALIF: San Diego Co., Borrego Sheep Cyn IV.27.55,’’ ‘‘R. Schuster coll.,’’ on slide (1, CDAE); ‘‘Borego San Diego Co. Calif. IV.27.55,’’ ‘‘Sheep Cyn.,’’ ‘‘R.O. Schuster Collector’’ (1, EMEC); ‘‘CALIF: Riverside Co. WhiteWater Canyon V-8-1977 berlese Rhus ovata litter,’’ ‘‘Fred G. Andrews K. W. Cooper Collectors’’ (2, USNM).

Remarks. This species has a large range and has been collected in very large series. Individuals from across the species’ range show some variation in body size and shape. Akalyptoischion atrichos can be distinguished from all other glabrous species with a 3-segmented antennal club by the first abdominal ventrite. No other species has abdominal ventrite I with a single puncture at the midline.

Figures

Figs. 2–5. A. atrichos. 2) male, prothorax, ventral view; 3) male, left antenna, dorsal view; 4) male, labium, dorsal view; 5) male, right maxilla, dorsal view.

Figs. 6–11. 6) A. atrichos male, right mandible, dorsal view; 7) A. tomeus, right mandible, dorsal view; 8) A. atrichos, male, labrum, dorsal view; 9) A. tomeus, labrum outline, setae removed; 10) A. tomeus, female, abdominal ventrite I; 11) A. polytremetron, female, abdominal ventrite I.

Figs. 17–18. 17) A. atrichos, male, abdominal ventrites; 18) A. diadeletron, abdominal ventrites.

Figs. 19–21. 19) A. atrichos, male, metathoracic leg, anterior view; 20) A. atrichos, male, mesothoracic leg, anterior view; 21) A. atrichos, male, prothoracic leg, anterior view.

Figs. 22–24. 22) A. atrichos, male, pterothorax, ventral view; 23) A. polytremetron, female, pterothorax, ventral view; 24) A. texas, pterothorax, ventral view.

Figs. 36–41. Akalyptoischion spp. head, ventral view, SEM. 36) A. atrichos; 37) A. hormathos; 38) A. anasillos; 39) A. giulianii; 40) A. tomeus; 41) A. bathytrematos.