Nerdanus coeruleus Fairmaire, 1897

Švihla, Vladimír, 2007, On the taxonomy of the dityline genera Diasclera Reitter, Dityloidea Fairmaire and Germain and Nerdanus Fairmaire (Coleoptera: Oedemeridae), Zootaxa 1619, pp. 45-51 : 49

Nerdanus coeruleus Fairmaire, 1897

Figs. 7–14

Nerdanus coeruleus Fairmaire, 1897: 239 .

Type material examined. Syntypes: “ Nerdanus coeruleus Frm. 1897 , Celebes [Pic’s handwriting] / MUSEUM PARIS, Collection Léon Fairmaire, 1906 [yellow label, printed] / TYPE [red label, printed], 1 ɗ; “Célebes [Fairmaire´s handwriting], / MUSEUM PARIS, Collection Léon Fairmaire, 1906 [yellow label, printed] / TYPE [red label, printed]”, 1 ɗ.

Redescription. Male. Coloration ( Fig. 7 ): head black with slight bluish tinge, mouthparts, antennomeres 1–2 and 10–11 rusty, rest of antennomeres sepia. Prothorax orange, pronotum with semicircular sepia spot, from anterior margin, reaching ca. one third of pronotal length. Legs chestnut to sepia brown, coxae and in some specimens also tarsi rusty. Meso- and metasternum and ventral portion of abdomen sepia, scutellum sepia, elytra metallic dark blue.

Head before eyes short, slightly shorter than maximal length of eye, eyes strongly reniform, moderately protruding, head across eyes moderately wider than pronotum. Antennae short, only moderately exceeding base of elytra, antennomeres from fourth onwards becoming wider and flatter terminally, antennomere 11 suboval, moderately spoon-shaped ( Fig. 8 ). Last maxillary palpomere slender, subparallel. Surface of head finely and densely imbricate-punctate, semilustrous, with fine, short, recumbent brown pubescence. Prothorax slightly longer than wide, slightly cordiform, its anterior margin nearly straight, anterior corners broadly rounded, lateral margins sinuate, converging posteriorly, posterior corners rounded, posterior margin slightly sinuate, finely upturned. Surface of pronotum structured and pubescent like that of head in area of semicircular spot, rest of pronotum semilustrous, more sparsely and finely punctate, with fine, sparse, recumbent yellow pubescence. Anterior depressions absent, prebasal one very shallow. Femora more or less curved, tibiae moderately curved, posterior tibiae widened, with slight, obtuse central keel and with semierect spines on the inner side ( Fig. 9 ). Terminal spines of anterior tibiae shortened, inconspicuous, basal protarsomeres enlarged and flattened ( Fig. 10 ). Elytra parallel-sided, elytral venation slight but distinct. Surface of elytra finely ruguloselacunose, semilustrous, with fine, semierect brown pubescence. Last abdominal segment, projections of urite VIII, tegmen and aedeagus as in Figs. 11–14 . Female unknown.

Length: 10.1–10.5 mm.

Distribution. Indonesia: Sulawesi.

Figures

FIGURES 7 – 14. Nerdanus coeruleus Fairmaire. 7, habitus; 8, antenna with last antennomere in lateral aspect; 9, posterior tibia; 10, anterior tibia and tarsus; 11, last abdominal segment, ventral aspect; 12, aedeagus, lateral aspect; 13, tegmen, ventral aspect; 14, projection of urite VIII, lateral aspect. Scale bar: 1 mm.