Pseudactium jaitlynum 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

Pseudactium jaitlynum Owens and Carlton , new species

( Figs. 9–11 )

Type Material. Holotype, male: USA: ALABAMA: Madison Co., Huntsville, MonteSano IV: 4-8: 1967 S. Peck / Trap #232 Bait Forest : Putrescine Bait. ( FMNH) . Paratypes, two males: USA: ALABAMA: Madison Co., Huntsville, MonteSano

IV: 4-8: 1967 S. Peck/ Trap #232 Bait Forest: Putrescine Bait. ( LSAM).

Etymology. The specific epithet is a combination of the first names of the first author’ s younger brother and his wife, Jace and Caitlyn Owens, in celebration of their marriage.

Diagnosis. The absence of tubercles or spines on the mesocoxa/metacoxa and the mesotrochanter/ metatrochanters, as well as the presence of small, carinate lateral processes on ventrite III, distinguish this species from all species in the genus except P. arcuatum and P. stannardi . The form of the aedeagus is unique, with the elongate process distally expanded and curved to the left, and the digitate accessory process arising from the right side of the phallobase bearing a lateral row of two larger and many smaller digits along the internal edge ( Fig. 11 ).

Description. Male. Measurements: HL = 0.17 mm, HW = 0.29 mm; PL = 0.30 mm, PW = 0.30 mm; EL = 0.40 mm, EW = 0.48 mm; A1–6, respectively, = 0.04, 0.07, 0.13, 0.09, 0.15, 0.03 mm; An1–11, respectively, = 0.04, 0.04, 0.02, 0.02, 0.02, 0.02, 0.02, 0.02, 0.03, 0.03, 0.07 mm; MP1–4, respectively, = 0.01, 0.02, 0.01, 0.02 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 with semierect pubescence. Pubescence in gular area longer, capitate. Head: Eyes well-developed, comprised of about 30 facets each. Thorax: Metacoxae with small, carinate ridge. Abdomen: Ventrite III with small, crenulate sublateral processes. Ventrite VII forming rounded-ovoid penial plate. Genitalia: Aedeagus asymmetrical. Elongate process narrow, flattened, distally expanded towards the left. Accessory digitate process arising from right side of the phallobase, bearing row of 2 larger and many smaller spines apically along inner face. Smaller, lateral process along right side of basal bulb bearing single elongate setae and two, smaller setae.

Female. Unknown.

Distribution. Alabama: Madison Co.

CHECKLIST OF THE SPECIES OF PSEUDACTIUM CASEY (Modified from Carlton and Chandler 1994)

Pseudactium Casey, 1908 .

Pseudactium Casey 1908: 271 (as genus).

TYPE SPECIES: Pseudactium carolinae Casey, 1908 (original designation).

Ramecia (of authors, not Casey 1894).

Ramecia Grigarick and Schuster 1980 (in part); Newton and Chandler 1989: 7 (synonymy of Ramecia sensu Grigarick and Schuster, 1980 with Ramecia Newton and Chandler, 1989 ); Carlton and Chandler 1994: 171–190 (synonymy of Ramecia Newton and Chandler, 1989 with Pseudactium Carlton and Chandler, 1994 ).

TYPE SPECIES: Euplectus arcuatus LeConte (original designation) .

REDESCRIPTION: Bowman 1934: 41 (as Ramecia ); Park 1962: 150 (as Ramecia ); Grigarick and Schuster 1980: 18, pl. 6, figs. 1– 9 (as Ramecia ), 17, pl. 5, figs. 1–7 (as Pseudactium ); Carlton and Chandler 1994: 171–190 (as Pseudactium ).

Figures

Figs. 9–10. Pseudactium jaitlynum, habitus. 9) Dorsal view; 10) Lateral view.

Fig. 11. Pseudactium jaitlynum, aedeagus, dorsal view.