Mecyclothorax anaana Liebherr 2012

Mecyclothorax sinuatus is a species of ground beetle in the subfamily Psydrinae. It was described by Liebherr in 2012.

Head capsule with linear, slightly convergentfrontal grooves, deep and broad at frontoclypeal suture, narrowly terminated mesad thin carina inside anterior supraorbital seta; frons and neck convex; ocular lobe moderately protruded, posteriorly meeting gena at > 135° angle; eyes small with outer surface more convex than curvature of lobe, hind portion of lobe meeting gena at shallow groove with low carina behind; ocular ratio 1.41–1.46 (n = 5), ocular lobe ratio 0.77–0.81 (n = 5); labral anterior margin nearly straight, emarginated < 0.1× length; antennomeres 1–3 glabous except for apical setae; antennae submoniliform, antennomere 8 length 1.85× maximal breadth; mentum tooth sides defining acute angle, apex narrowly rounded. Pronotum cordate, basolateral margin constrictedly sinuate, base narrow, MPW/BPW = 1.55–1.65 (n = 5), overall shape appearing only slightly transverse, although MPW/PL = 1.16–1.23 (n = 5); glabrous hind angle sharply projected, nearly right, basal margin of angle convex; median base moderately depressed relative to disc, surface smooth, glossy, 9–10 deep, isolated punctures each side; basal margin slightly convex between hind angles; median longitudinal impression very shallow, finely incised, present as lenticular depression at front of median base; anterior transverse impression broad and shallow to obsolete medially, incised in outer half of breadth each side; anterior callosity flat, depressed medially, basal half may be crossed by indistinct longitudinal wrinkles; front angles slightly protruded, narrowly rounded; apical pronotal width greater than narrow base, APW/BPW = 1.09–1.13 (n = 5); lateral marginal depression very narrow at midlength, slightly wider at front angle, margin beaded throughout, bead slightly broader outside laterobasal depression; laterobasal depression linear, bordered laterally by broad marginal bead, medially by linear depression or punctures at edge of median base; proepisternum with 5–6 distinct punctures along hind margin, proepimeron with 5 punctures along hind margin; prosternal process narrow, broadly beaded laterally, narrowly depressed medially between procoxae. Elytra ellipsoid, disc very convex, upraised above scutellum, sides sloped to vertical juncture with marginal depression; elytral suture implacably fused in one individual examined for assessment of metathoracic flight wing configuration; basal groove tightly arcuate, anteriorly extended to angulate humerus; humeri proximate, MEW/HuW = 2.26–2.35 (n = 5); parascutellar seta present, situated near sutural stria; parascutellar striole 3-punctate, interrupted between punctures; sutural interval slightly more convex than lateral intervals yet depressed at sutural juncture, narrower in apical half and more convex due to deeper sutural stria at elytral apex; elytral striae 2–3 only slightly convex on disc, 4–5 nearly flat; strial punctures separated by shallowly depressed striae 1 and 2, completely isolated by interruptions of striae 3–5; stria 1 and 7 deep at elytral apex, 2–4 very shallow, difficult to trace, 5–6 obsolete; eighth interval abruptly upraised laterad stria 7 apicad subapical sinuation, the elytral apex mesad the seventh striae circularly depressed, enhancing carina of eighth interval; two dorsal elytral setae situated in deep but very small depressions that span < ¼ width of interval 3, setae positioned at 0.25–0.26× and 0.52–0.61× elytral length; apical elytral seta present, subapical seta absent; lateral elytral setae 7 + 6; elytral marginal depression moderately broad from angulate humerus posteriorly, margin upraised laterally, beaded in apical ⅓; subapical sinuation shallow but evident, internal plica visible in dorsoposterior view. Mesepisternum with 14 punctures in 2–3 vertical rows; metepisternum slightly elongate, width/length ratio 0.81; metepisternum separated from metepimeron by distinct suture; metathoracic flight wing an ovoid, broadly rounded flap with apex extended ½ distance to metanotal hind margin; only a vestige of the M vein evident as a melanic line in the membrane of the wing vestigium. Abdomen with visible ventrites 1–5 irregularly wrinkled laterally, ventrites 3–6 with rounded depressions laterally; suture between visible ventrites 2 and 3 effaced laterally. Legs moderately gracile, tarsomeres short, metatarsomere 1 length 0.19× metatibial length; metatarsomere 4 broad, moderately emarginated, overall length 1.2× median tarsomere length; metatarsomere 4 with apical and subapical setae; metatarsal dorsolateral sulci shallow and lateral, tarsomere broadly convex medially. Microsculpture of head shallow to obsolete, surface glossy or with indistinct transverse mesh, sculpticell breadth 2–3× length; pronotal disc with indistinct transverse mesh, sculpticell breadth 2–3× length, microsculpture visible outside field of reflected light, surface glossy; pronotal median base glossy, indistinct transverse sculpticells visible among punctures; elytral disc glossy, indistinct transverse mesh laterally; elytral apex with indistinct transverse mesh, sculpticell breadth 2–3× length; metasternum glossy, shallow indistinct transverse mesh medially; laterobasal abdominal ventrites with shallow, swirling isodiametric and transverse sculpticells. Coloration of frons rufous with a piceous cast, clypeus rufous; antennomeres 1–2 flavous, 3–4 rufoflavous, 5–11 rufobrunneous; pronotal disc dark rufous, margins concolorous; proepipleuron rufoflavous, proepisternum rufobrunneous; elytral disc dark rufous; sutural interval rufous basally, rufoflavous apically; elytral margins concolorous at humerus, deepest portion of lateral depression rufoflavous laterally; elytral epipleuron rufoflavous with brunneous cast, metepisternum rufobrunneous; abdominal visible ventrites 1–3 rufobrunneous, 4–6 rufoflavous, apical 1/6 of apical visible ventrite paler, flavous; metafemur flavous with brunneous cast; metatibia flavous with darker carina associated with longitudinal setal series. Male genitalia. (n = 1). Aedeagal median lobe broad basally and narrowed in apical half to finely protruded apex with downturned tip (Fig. 5C); median lobe straight in euventral view; internal sac with broad melanic ventral microtrichial field but without spicules; flagellar plate large, length 0.46× distance from parameral articulation to distal surface of downturned tip; paramere extended 0.83× distance from parameral articulation to tip.

This species has been found from 960–1110 m elevation, with beetles living arboreally on a variety of plants; Weinmannia, Myrsine, Melicope, and ferns. Two individuals were collected in a pyrethrin fog sample made along a bank of live and dead Blechnum and Dicranopteris ferns (Fig. 2B)

This species is known to inhabit Mont Mauru from 960–1110 m elevation. It is associated with arboreal microhabitats based on its discovery through beating vegetation, including Melicope, Myrsine, Weinmannia, and soft ferns. Individuals have also been found by applying pyrethrin fog to a bank of dead and live ferns.