Pachyonychus paradoxus Melsheimer 1847

Roie, Martijn Van, Clark, Shawn, Konstantinov, Alexander, Furth, David & Linzmeier, Adelita M., 2023, A paradox indeed: description of genitalia and clarification of the subtribal classification of Pachyonychis paradoxus Clark and Pachyonychus paradoxus Melsheimer (Coleoptera: Chrysomelidae: Galerucinae: Alticini), Zootaxa 5227 (1), pp. 127-136 : 132

Pachyonychus paradoxus Melsheimer 1847

( Figures 4 , 5 )

Pachyonychus paradoxus Melsheimer 1847:163 (type locality: Pennsylvania).

Material examined: Lectotype: ♁: Pachyonychus paradoxus Mels. 6y E.C. Mignot, 1964; MCZ Type 35375 ( MCZ); non-type material: 2 ♀: Alex. Co.Va, VI-18-23; Ernest Shoemaker Collection; Pachyonychus paradoxus (Melsh.) det. A. Konstantinov 2018 ( USNM); 1♀, dissected: IA Polk Co, Brown Frst Prsv, June 20, 1982, J. E. Wappes; Pachyonychus paradoxus Melsh, Det. E. G. Riley 82’ ( USNM); 2♁, 1 dissected, 3♀: USA, MD. 08. VI.95, Patoxant nat. res. road, leg. A. Konstantinov; Maryland: A. Adl Co. 6 km ESE of Laurel, 19°05’N 76°48’W, 8 June 1998; A. Konstantinov, W. E. Steiner, J. M. Swearingen, collectors; Pachyonychus paradoxus Melsh. det. A. Konstantinov 2018 ( USNM); 7, sex unknown: Washgtn 13.6 [or 1.7, or 6.6, or 15.5] D.C.; Coll Hubbard & Schwarz ( USNM); 1, sex unknown: 67 56; in Chev; Pachyonychus paradoxus [“see”?, illegible] Horn Melsh. (1 BMNH).

Distribution: USA — Alabama, Arkansas, Dist. of Columbia, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, North Carolina, New Jersey, Ohio, Oklahoma, Pennsylvania, South Carolina, Texas, Virginia, West Virginia. ( Riley et al. 2003, CSM personal data).

Body size: length 2.8–4.4 mm, width 1.3–2.1 mm, illustrated specimen— 3.4 mm long.

Description of male genitalia. Aedeagus, in ventral view, with apical third rhombus-shaped; maximum width situated at about one distal fifth of aedeagus. Aedeagus, in lateral view, slightly curved; maximum width at about half length. Apical denticle of aedeagus rounded with slight tip in ventral view, nearly straight in lateral view. Ventral longitudinal groove present; ventral surface lateral to groove smooth. Basal opening oval.

Description of female genitalia. Spermathecal pump arched, evenly rounded, about two-thirds as long as receptacle, slightly narrowing towards apex; apex of spermathecal pump evenly rounded. Receptacle ovoid, with maximum width situated near base. Canal attached slightly above base of receptacle, long, widened near ramus, with one coil. Ramus rounded. Posterior sclerotization of tignum broadly Y-shaped, much wider than midsection, bearing moderately long setae. Middle part of tignum nearly straight. Anterior sclerotization of tignum rounded. Vaginal palpi elongate, anteriorly fused for half their length. Apex of vaginal palpi slightly rounded, facing anteriorly. Posterior sclerotization of vaginal palpi bearing multiple setae.

Comments. The MCZC syntype has a lectotype label attached by Mignot, but the lectotype was not designated ( Mignot 1969). The lectotype for Pachyonychus paradoxus Melsheimer is here designated to fix the identity of this species .

Figures

FIGURE 4. Habitus of Pachyonychus paradoxus Melsheimer 1847. A: drawing of dorsal view (by Liz Sisk); B: Dorsal view; C: Frontal view; D: Lateral view; E: Ventral view.

FIGURE 5. Abdomen and genitalia of Pachyonychus paradoxus Melsheimer 1847. A: Apical tergites; B: Sternites; C: Spermatheca; D: Tignum; E: Vaginal palpi; F: Aedeagus (ventral, dorsal, and lateral views).