Archaeoglenes triplehorni Iwan and Kamiński, 2015

Iwan, Dariusz, Kamiński, Marcin Jan & Raś, Marcin, 2015, Amphi-Indian Ocean Disjunction in the Trans-Pacific Genus Archaeoglenes Brown (Coleoptera: Tenebrionidae: Phrenapatinae): New Taxonomic and Distributional Data, The Coleopterists Bulletin (mo 14) 69, pp. 152-166 : 157-160

Archaeoglenes triplehorni Iwan and Kamiński , new species

( Figs. 1 , 4A–G , 5B, C, F )

Diagnosis. Archaeoglenes triplehorni is related to Archaeoglenes lawrencei Kaszab and Archaeoglenes caledonicus Kaszab due to the presence of 9-segmented antennae, reduced eyes (6–8 facets), a transverse mentum, a triangular submentum ( Fig. 4D ), and a truncate abdominal process ( Fig. 4E ). Archaeoglenes triplehorni and A. lawrencei can be distinguished from A. caledonicus by a widely rounded anterior part of the head (subquadrate in A. caledonicus ) ( Fig. 4G, H ) and elytral punctation that forms 12 rows (14 rows in A. caledonicus ). Archaeoglenes triplehorni and A. lawrencei differ by pronotal shape and sculpture (cf. Fig. 4A, I, J ); only A. triplehorni possesses a hypomeron with a laterally situated longitudinal carina ( Fig. 4C ) and distinctly crenulated intervals (first, third, sixth, ninth, and 11 th) that are strongly convex on the elytral slope ( Figs. 4C , 5B ).

Description. Body length 1.4–1.7 mm. Color yellowish brown, surface very coarsely and densely punctate, moderately shiny. Head distinctly retracted into prothorax ( Fig. 5B, F ), length ratio pronotum/head ca. 3.0. Lateral antennal grooves compressed ( Fig. 5F ). Eyes reduced, well-pigmented, situated at lateral sides of head, each eye with 7– 8 facets. Mentum transverse, 0.75X as long as wide; submentum short, triangular ( Fig. 4D ). Antenna 9-segmented. Pronotum about 0.55X as long as wide, with sides distinctly converging anteriorly, subparallel posteriorly at 1/3 from base; anterior angles sharp, distinctly produced anteriad; lower margin of antennal cavity strongly produced; lateral sides deeply grooved along carinated margins; disc strongly convex medially, middle of discal prominence with longitudinal groove and deep hole situated between 2 posterior processes forming 2 bridges at pronotal base; disc with 2 pairs of pronotal glands ( Fig. 4A, G ). Musculus pronoto-occipitalis and musculus prophragmata-occipitalis as in Fig. 5C . Scutellum transverse. Elytra ca. 0.95X as long as wide and ca. 2.0X as long as pronotum; sides rounded, subparallel at anterior 3/5, broadly rounded posteriorly, disc convex, each elytron with 12 rows of punctures in middle of disc (sometimes 13–14 rows at widest point) and 5 sharp-edged crenulated costae, distinctly prominent posteriorly; 2 puncture rows between strongly elevated elytral suture (1 st costa, 1 st interval) and 2 nd costa (3 rd interval), 3 puncture rows between 2 nd and 3 rd costa (6 th interval), 3 puncture rows between 3 rd and 4 th costa (9 th interval), 2 puncture rows between 4 th and 5 th (11 th interval), and 2 puncture rows between 5 th costa and strongly convex lateral edge (epipleural carina). Epipleuron moderately wide from humerus to level of 1 st abdominal ventrite, distinctly curved and depressed near mesocoxal cavity, and evenly narrowing posteriad ( Fig. 4C ). Procoxae separated by about 3.5X coxal width, prosternum with apex at intercoxal process truncate; mesocoxae separated by about 1.5X coxal width; metaventrite shortened: at midline about 0.3X as long as its greatest width, between meso- and metacoxae about 1.1X as long as metacoxae; slightly depressed in middle. Metacoxae about 0.8X as long as wide and separated by about 1.5X coxal width. Abdominal process truncate ( Fig. 4E ), length/width ratio about 0.65. Hindwings absent. Male and female tarsi all 4-segmented (apical tarsomere short).

Type Material. H o l o t y p e, m a l e ( M H NG): “ NEW CALEDONIA / Table Unio, 900m / near Col d’ Amieu / 16 Oct 1978 / G. Kuschel ”, “ Sifted litter / and rotten wood / in rainforest / 78/234” ( Fig. 4F ). Paratypes: 4 specimens ( MHNG) , 1 specimen ( MIZ): same data as holotype ; 1 specimen ( MHNG), 1 specimen ( MIZ): “ NEW CALEDONIA / Mt Rembai , 700m / 20 Oct 1978 / G. Kuschel ”, “Sifted litter / and rotten wood / 78/234” ; 1 specimen ( MHNG): “ NEW CALEDONIA / Mt Panié, 350m / 28 Oct 1978 / J.C.Watt ”, “ Sifted litter / and rotten wood / 78/234”.

Etymology. This species is named in honor of Charles A. Triplehorn, an outstanding coleopterist and specialist in Tenebrionidae .

Distribution. This species has been collected in the rainforests of New Caledonia in the Australasian ecoregion ( Fig. 1 ).

Figures

Fig. 1. Distribution of the genus Archaeoglenes.

Fig. 4. Morphology and label data of Archaeoglenes triplehorni: Habitus: A) Dorsal view, B) Ventral view, C) Lateral view, D) Head, ventral view, E) First abdominal ventrite, F) Holotype labels, G) Head, dorsal view. Archaeoglenes caledonicus: H) Head, dorsal view, J) Pronotal disc. Archaeoglenes lawrencei: I) Pronotal disc. Important diagnostic characters are marked by an arrow or labeled.

Fig. 5. Sagittal micro-CT sections of Archaeoglenes species and Tenebrio molitor. Differences in head, pronotal, and elytral structure of A) A. loebli and B) A. triplehorni. Modifications of pronotal muscles in C) A. triplehorni and D) T. molitor. Modifications of the antennal groove structure of E) A. loebli and F) A. triplehorni. RH = part of the head retracted into the prothorax.