A revision of the New Zealand weevil genus Irenimus Pascoe, 1876 (Coleoptera: Curculionidae: Entiminae) Author Brown, Samuel D. J. text Zootaxa 2017 4263 1 1 42 journal article 33101 10.11646/zootaxa.4263.1.1 993d2ddb-2f1b-40a7-8e9e-caf65f5a5f04 1175-5326 572504 78E0852E-F66A-44E4-8798-E5187185C950 7. Irenimus thoracicus Brown , new species Figures 13, 14 , 27, 28 , 40 , 79, 80, 81, 82, 83, 84 , 86 Diagnosis. Medium to large species, lens shaped, grey. Scape with appressed scales. Pronotum widest anteriorly, lateral margins subparallel in posterior 1/4. Distinguished from I. duplex by the shape of the pronotum ( Figure 40 ). Description. Body length 5.21 mm to 6.27 mm ( X = ̄ 5.79 mm , s = 0.42, n = 7). Integument black. Dorsum densely covered with light greyish brown appressed scales; elytral declivity occasionally slightly paler, lined anteriorly with an obscure darker line. Femora unicolorous, concolorous with elytra. Tarsi integument strong reddish brown. Rostrum . Length 1.16 mm to 1.36 mm ( X = ̄ 1.26 mm , s = 0.09, n = 6), width 0.76 mm to 0.90 mm ( X = ̄ 0.83 mm , s = 0.05, n = 6), length/width ratio 1.36 to 1.62 ( X = ̄ 1.51, s = 0.10, n = 6). Epifrons with appressed scales overlapping, elongate scales claviform, decumbent, dark; medial and lateral carinae evident. Dorsal carina arched over antennal insertions. Lateral area of antennal insertions with thick setae and appressed scales. Antennae . Scape when in repose reaching hind margin of eye; covered with appressed scales and setae. Funcular segments loosely articulated; segments 1 and 2 clavate, subequal, 1.4 times longer than segment 3; segment 3 clavate, 1.3 times longer than segment 4; segments 4 to 7 clavate, subequal. Head . Eyes ovate. Pronotum . Length 1.67 mm to 1.90 mm ( X = ̄ 1.78 mm , s = 0.08, n = 6), width 1.75 mm to 2.00 mm ( X = ̄ 1.88 mm , s = 0.11, n = 6), length/width ratio 0.85 to 1.03 ( X = ̄ 0.95, s = 0.07, n = 6); widest in anterior 1/3, lateral margins evenly curved in anterior 3/4, subparallel in posterior 1/4 ( Figure 40 ). Anterior margin entire, posterior margin evenly curved. Disc topography evenly convex, occasionally with slight postero-lateral depressions; appressed scales tessellate, domed; elongate scales setiform, semi-erect to decumbent, neutral. Postocular lobes moderately developed. Anterior transverse groove weak beyond level with ventral margin of eye. Posterior transverse groove poorly developed. Lateral posterior margin with obtuse inflection 1/3 of the way down. Elytra . Length 3.29 mm to 3.91 mm ( X = ̄ 3.70 mm , s = 0.24, n = 6), width 2.11 mm to 2.85 mm ( X = ̄ 2.52 mm , s = 0.32, n = 6), length/width ratio 1.35 to 1.66 ( X = 1.48, s = 0.11, n = 6). Anterior margin curved posteriad, humeral angles rounded. Appressed scales narrowly overlapping. Elongate scales claviform, decumbent, largely neutral on disc, pale laterally and posteriorly. Striae moderately impressed; interstriae flat. Elytral apex square in males, ventrally produced in females. Thoracic ventrites . Mesoventral process truncate. Metaventrite densely clothed with appressed scales. Abdomen . Ventrites densely clothed with inner vestiture composed almost exclusively of appressed scales. Apex broadly rounded. Males with ventrite 1 slightly depressed medially, ventrite 5 shallowly concave. Female with ventrite 1 flat, ventrite 5 with medial furrow. Legs . Metafemora with posterior face entirely scaled. Metatibiae with corbel present, narrow, bare; ventral margin of tibial apex entire; males with long, silky hairs on distal half. Male genitalia . Figures 79, 80 . Penis with apex acute; dorsal plate narrowed medially. Endophallus long, reaching to temonal apex; possessing numerous large, toothed proximal sclerites; aggonoporial sclerite with short anterior lobes and long posterior lobes. Female genitalia . Figures 81–84 . Sternite 8 with blade elongate. Styli elongate. Vagina not sclerotised. Bursa copulatrix long, two large triangular sclerites present. Spermatheca slender; ramus slightly produced, divergent with corpus. DNA Sequences: No DNA sequences obtained. FIGURES 79–84. Genitalia of Irenimus thoracicus . 79, penis, dorsal view; 80, aedeagus, lateral view; 81, tergite 8, dorsal view; 82, ovipositor, dorsal view; 83, ovipositor and spermatheca, lateral view; 84, sternite 8, ventral view. Scale bars = 0.5 mm; 79, 80 at same scale; 81–84 at same scale. Type material examined. Holotype . Male ( NZAC ). Specimen entire, mounted on card triangle. Labelled ‘ Oamaru / 3.3.65 / J. Richards / Ryegrass’ [handwritten, white card], ‘ Irenimus taxonomy / and systematics / SDJ Brown / PhD Thesis 2012–2015 / IRE6259’ [printed, off-white card], ‘ NZ Arthropod / Collection , NZAC / Private Bag 92170 / AUCKLAND / New Zealand’ [printed, yellow card], ‘ HOLOTYPE / Irenimus / thoracicus / Brown 2016’ [printed, red card]. Paratypes . A total of 12 specimens (5 males, 7 females) designated as paratypes, bearing blue paratype label. Paratype specimens deposited in BMNH, LUNZ, NZAC. DN : Oamaru [-45.0888, 170.9808, A], 3 Mar 1965 , Richards J, Ryegrass (BMNH: 2, LUNZ: 2, NZAC: 8). Distribution. South Island :—/ DN /—( Figure 85 ). DN : Oamaru. Elevational range. Label data: no elevation data recorded. Georeferenced data: 7 m to 7 m ( X = ̄ 7 m , s = 0, n = 13). Etymology. The species epithet refers to this species’ distinctive pronotal shape. Biology. This species is only known from specimens taken in a single collecting event from ryegrass ( Lolium perenne L.).