Actium riobuffaloensis Owens and Carlton, 2016

Owens, Brittany E. & Carlton, Christopher E., 2016, Collecting in the Museum: New Species, Taxonomic Changes, and Range Extensions of Euplectite Pselaphinae (Coleoptera: Staphylinidae) of the Southeastern United States, The Coleopterists Bulletin 70 (3), pp. 611-633 : 611-633

Actium riobuffaloensis Owens and Carlton , new species

( Fig. 12a–c )

Type Material. Holotype, male: USA, AR,

Newton Co. Buffalo Nat. River 2 mi. NW Erbie

Campground Upland hardwood berlesate C. Carlton 25 June 1994 LSAM 0001706. ( FMNH).

Etymology. This species is named after the type locality near the Buffalo National River, AR.

Diagnosis. The presence of a well-developed spine on both the mesotibia and mesofemur ( Fig. 12c ) in conjunction with the absence of modified mesotrochanters distinguishes this species from A. impunctatum . Additionally, the form of the aedeagus ( Fig. 12a, b ), which possesses a ventral lobe with a dorsally projecting branch about one-fifth the length of the process from the distal end, as well as a dorsal process with numerous long setae and a single, well-developed distal spine along the ventral face, distinguishes this species from all others in the genus.

Description. Male. Measurements: HL = 0.18 mm, HW = 0.21 mm; PL = 0.20 = mm, PW = 0.21 mm; EL = 0.40 mm, EW = 0.47 mm; A1–6, respectively, = 0.04, 0.06, 0.07, 0.07, 0.08, 0.04 mm; An1–10, respectively, = 0.04, 0.03, 0.02, 0.02, 0.02, 0.02, 0.02, 0.02, 0.03, 0.04 mm; MP1–4, respectively, = 0.01, 0.02, 0.01, 0.05 mm; GL = 0.41 mm, GW = 0.25 mm; ML = 2.2 mm. Integument: Head, pronotum, elytra, and abdomen light brown, appendages light brown to yellow. Entire surface covered sparsely with short, semierect pubescence. Gular area lacking modified pubescence. Head: Eyes well-developed, comprised of about 35 facets each. Thorax: Mesofemora with small spine at about 1/3 length from articulation with trochanter, mesotibiae with well-developed spine medially, width of spine about 1/3 length of tibia. Abdomen: Ventrite III with lateral foveoid depressions, lacking other modifications. Genitalia: Aedeagus asymmetrical. Ventral lobe with dorsally projecting branch at about 1/5 the length from distal end. Dorsal process with numerous long setae and single, well- developed distal spine along ventral face. Basal bulb well-developed, dorsal diaphragm obvious.

Female. Unknown.

Distribution. This species is known only from the type locality in Newton County, AR.

CHECKLIST OF THE SOUTHEASTERN NORTH AMERICAN SPECIES OF ACTIUM CASEY (Modified from Grigarick and Schuster 1971)

Actium Casey, 1886: 201 .

TYPE SPECIES: Actium pallidum Casey (designated by Brendel 1891: 40, designated Actium pallidum Casey as genus type = junior subjective synonym of Trimium californicum LeConte ).

Proplectus Raffray 1890a: 107 (as genus); Casey 1894 (synon.).

TYPE SPECIES: Proplectus decipiens Raffray (subsequenty monotypy by Raffray 1890b: 197) = Actium californicum LeConte ; genus type ( Proplectus decipiens ) is a junior subjective synonym of type of genus Actium ( Actium californicum (LeConte)) .

Basolum Casey 1897: 571 (as genus); Chandler 1994: 48 (synonymy).

TYPE SPECIES: Trimium impunctatum Brendel (original designation) .

REDESCRIPTION: Grigarick and Schuster 1971: 1–28, 1980: 36.

Actium riobuffaloensis Owens and Carlton , new species. TYPE DEPOSITORY: FMNH. DISTRIBUTION : AR: Newton Co.; AR. HABITAT: Upland hardwood forest litter.

Actium impunctatum ( Brendel, 1865) .

Trimium impunctatum Brendel 1865: 259 .

TYPE DEPOSITORY: MCZC .

Actium angustum Casey 1897: 559 ; Chandler 1994: 48 (synon.).

TYPE DEPOSITORY: USNM .

REDESCRIPTION: Grigarick and Schuster 1971: 15, figs. 90–94 (as A. angustum ).

DISTRIBUTION: MD, NC, OH, PA, VA, WV.

HABITAT: Rotten logs, tree holes, forest litter (white pine, hemlock, oak, maple, and Rhododendron L.).

Figures

Fig. 12. Actium riobuffaloensis. a) Aedeagus, dorsal view b) Aedeagus, lateral view, c) Mesofemur and mesotibia.