Mecyclothorax foveopunctatus, Liebherr, James K., 2015

Liebherr, James K., 2015, The Mecyclothorax beetles (Coleoptera, Carabidae, Moriomorphini) of Haleakala-, Maui: Keystone of a hyperdiverse Hawaiian radiation, ZooKeys 544, pp. 1-407 : 106-107

Taxon classification Animalia Coleoptera Carabidae

(040) Mecyclothorax foveopunctatus sp. n. Figs 53H, 56, 57A

Diagnosis.

This along with Mecyclothorax sobrinus and Mecyclothorax consobrinus represent the large-bodied species of the group; in this species standardized body length 5.6 mm. This species differs from the other two by the basally more constricted elytra (Fig. 57), and more punctate discal elytral striae, the striae themselves deeper and more regular. The pronotal median base is more discretely punctate, with ~ 6 distinct, rounded punctures plus 3-4 longitudinal wrinkles each side. The male aedeagal median lobe (Fig. 53H) lacks the robust, accessory subapical projection shared by males of Mecyclothorax consobrinus and Mecyclothorax sobrinus (Fig. 58). Setal formula 2 2 2 2.

Description

(n = 1). Head capsule with frontal grooves deep near clypeus, angled laterally at midpoint to terminate mesad anterior supraorbital setae; dorsal impression of neck slightly concave; eyes moderate in size and convexity, ocular ratio = 1.44, ocular lobe ratio = 0.76; labral anterior margin moderately emarginate; antennae filiform, antennomeres 2-3 with sparse pelage of short setae; mentum tooth with sides right, apex broadly rounded. Pronotum transverse, MPW/PL = 1.33, broad basally, MPW/BPW = 1.36, hind angles obtuse, little projected, with lateral margins subparallel for short distance anterad angles; basal margin straight medially, extended slightly between laterobasal depressions; median longitudinal impression shallow, finely incised at depth, extended onto median base; anterior transverse impression deep, finely incised at depth, anterior callosity elevated, flat, both crossed by longitudinal wrinkles; front angles projected, rounded; pronotal base broader than apex, APW/BPW = 0.90; lateral marginal depression broad at front angle, moderately narrow at midlength, broadened near laterobasal depression, edge upturned; laterobasal depression broad, smooth, with median tubercle. Proepisternum with 5 minute punctures along hind marginal groove; prosternal process medially depressed, margin upraised with bead only anterad procoxae. Elytra subovoid, disc flat, sides abruptly sloped; basal groove slightly recurved to subangulate humeral angle; humeri narrowed, MEW/HuW = 1.90, lateral margin narrowly curved posterad outside angle; parascutellar seta present; parascutellar striole smooth anteriorly, 3 punctures posteriorly near apex; sutural interval of same convexity as lateral intervals basally, upraised as a callous apically; sutural and 2nd striae of subequal depth from base to apex; 8th interval convex laterad 7th stria near subapical sinuation, 7th stria and nearby portion of 7th interval depressed just apicad diminution of interval 6 at fusion of intervals 5 + 7; 2 dorsal elytral setae at 0.34 × and 0.64 –0.67× elytral length, setae in foveate depressions that span interval 3 plus lateral half of interval 4; apical and subapical setae present; lateral elytral setae arranged in anterior series of 7 setae, posterior series of 6 setae; elytral marginal depression moderately narrow throughout length, beadlike near subapical sinuation. Mesepisternum with ~18 punctures in 3 rows; metepisternal width to length ratio 0.86. Abdomen with irregular lateral wrinkles on ventrites 1-5; suture between ventrites 2 and 3 complete; apical male ventrite with 2 marginal setae. Legs-metatarsomere 1/metatibial length ratio = 0.18; metatarsomere 4 length along outer lobe 1.3 × medial tarsomere length, apical and subapical setae present; metatarsal dorsolateral sulci moderately deep, basal tarsomeres medially convex. Microsculpture of vertex upraised isodiametric sculpticells in transverse rows; pronotal disc with isodiametric sculpticells in transverse rows to a transverse mesh, sculpticell breadth 2 × length, median base with granulate isodiametric mesh; elytral disc with upraised isodiametric sculpticells, the apex with upraised transverse mesh, sculpticell breadth 2 × length; metasternum with distinct transverse mesh; laterobasal abdominal ventrites with swirling transverse and isodiametric microsculpture. Coloration of vertex dark rufobrunneous; antennomere 1 flavous, antennomeres 2-3 rufoflavous, 4-11 rufobrunneous; pronotal disc dark rufobrunneous, margins rufoflavous mesad front angles, lateral marginal depressions and median base rufobrunneous; proepipleuron rufoflavous, proepisternum rufopiceous; elytral disc rufobrunneous, sutural interval concolorous basally, slightly paler, rufoflavous apically; elytral marginal depression and apex slightly paler than disc, rufoflavous; elytral epipleuron flavous dorsally, rufobrunneous on ventral margin, metepisternum piceous; abdomen piceous, apical 1/5 of apical ventrite 6 flavous; metafemur with ground color flavous, basal half with broad piceous cloud; metatibia rufoflavous with piceous cast.

Male genitalia (n = 1). Aedeagal median lobe (Fig. 53H) much like a more robust version of Mecyclothorax longulus (Fig. 53E), gracile, distance from parameral articulation to tip 4.1 × depth at midlength, apex extended 3 × depth beyond apex of ostial opening, expanded dorsoventrally at tip, with apical face of tip obliquely flattened; internal sac unornamented, flagellar plate short, length 0.30 × parameral articulation-tip distance.

Holotype.

Male (CUIC) dissected and labeled: HI: Maui Haleakala / Waikamoi N.C.P. Ukulele / Pipeline 7-V-1998 lot 03 / 1495-1525m el. under / logs J.K. Liebherr // Hawaiian Is. / Perkins / 1904-336. / HOLOTYPE / Mecyclothorax / foveopunctatus / Liebherr / det. J.K. Liebherr 2015 (black-margined red label).

Etymology.

The Latin adjectival foveopunctatus signifies the foveate depressions surrounding the dorsal elytral setae.

Distribution and habitat.

Mecyclothorax foveopunctatus is known only from the holotype collected under an ‘ōhi‘a log in mesic forest near Ukulele Pipeline (Fig. 56). The type specimen was collected along with specimens of Mecyclothorax cognatus , Mecyclothorax consanguineus , Mecyclothorax cymindicus , Mecyclothorax filipoides , Mecyclothorax multipunctatus , and Mecyclothorax sobrinus .