Mecyclothorax integer Sharp

Liebherr, James K., 2015, The Mecyclothorax beetles (Coleoptera, Carabidae, Moriomorphini) of Haleakala-, Maui: Keystone of a hyperdiverse Hawaiian radiation, ZooKeys 544, pp. 1-407 : 76-77

Taxon classification Animalia Coleoptera Carabidae

(027) Mecyclothorax integer Sharp stat. n. Figs 44A, 45A, 48

Mecyclothorax interruptus var. integer Sharp 1903: 252; Britton 1948b: 163.

Diagnosis.

This is the broadest-bodied species in the Haleakalā Mecyclothorax fauna, exhibiting a large prothorax and broadly subquadrate elytra, MEW/MPW = 1.30-1.32 (Fig. 44A). The pronotal lateral margins are only slightly sinuate anterad the obtuse-rounded hind angles; and the linear laterobasal depression is separated from the pronotal lateral margin by a broad tubercle. The elytral striae are nearly regular, though striae 2 and 3 may approach unilaterally. The dorsal elytral setal impressions are foveate anteriorly, crossing interval 3 at the anterior seta, and smaller posteriorly, impressing half the interval width at the posterior seta. The dorsal body coloration is uniformly rufobrunneous, with the legs paler, rufoflavous. Setal formula 2 2 2 2. Standardized body length 5.2-5.3 mm.

Identification

(n = 3). The eyes are moderately convex, ocular ratio = 1.43-1.46, but cover much of the ocular lobe, ocular lobe ratio = 0.80-0.84. The pronotum is large, MPW/PL = 1.28-1.31, and modestly constricted basally, MPW/BPW = 1.36-1.40. The elytral disc is flat medially, sides moderately sloped, and the subangulate humeri are defined by juncture of the slightly recurved basal groove and lateral marginal depression. The discal elytral intervals, including the sutural interval, are moderately convex. The vertex is covered with isodiametric microsculpture, the sculpticells transversely stretched on the neck, pronotal disc with distinct transverse mesh, the base glossy in parts with an elongate transverse mesh; elytral disc covered with elongate transverse mesh, a loose transverse mesh and parallel lines on the elytral apex; metasternum covered with an obsolete transverse mesh.

Male genitalia (n = 1). Aedeagal median lobe slender, distance from parameral articulation to tip 5.6 × depth at midlength; shaft slightly curved basally, straight to slightly recurved apically, the apex broadly rounded with blunt dorsal projection (Fig. 45A); internal sac without evident ornamentation.

Lectotype.

Male (BPBM) hereby designated, dissected and labeled: 622 (on reverse of mounting platen) // Haleakala / Maui 6000 ft. / Perkins V 1896 // Mecyclothorax interruptus / var. integer Sharp / [number OK but date / on label possibly wrong → as Oct. 1896 in orig. / description / SYNTYPE / G/A. Samuelson det. 196 // LECTOTYPE ♂ / Mecyclothorax / interruptus var. / integer Sharp / J.K. Liebherr 2011 (black-margined red label).

Paralectotype.

Female (BPBM) labeled: Mecyclothorax interruptus / var. integer / Haleakala / Perkins (on obverse of mounting platen), 680. (on reverse of mounting platen) // Hawaiian Is. / R.C.L. Perkins // Sharp Coll / 1905-313. // PARALECTOTYPE ♀ / (same labelling as Lectotype).

Distribution.

Mecyclothorax integer is known only from the lectotype and paralectotype collected by Perkins in his lots 622 and 680; "Haleakala 4000 ft., v-1896", and "Haleakala 4000+ ft., x-1896" ( Anonymous N D), respectively (Fig. 48). Of the October visit, Perkins (1896b) wrote: "In October 1896 I camped for a considerable time at about 5,000 ft. on Haleakala and did a good deal of work at various points Eastward in the windward forest entering this at various points from the upper edge towards the forest that lies above Wailua (p. 1)." This locality would lie about 200 ft. elevation below the Ukulele Camp (site) of the USGS (1983) Kilohana, Hawaii quadrangle. Recent collections near this site did not result in rediscovery of this species.