Cis rhaibocerus Lawrence,

Lawrence, John F., 2019, The Australian Ciidae (Coleoptera: Tenebrionoidea): supplement, Zootaxa 4555 (4), pp. 451-490: 476-477

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Cis rhaibocerus Lawrence

sp. nov.

Cis rhaibocerus Lawrence  sp. nov.

( Figs 35–37View FIGURES 31–45, 67–69, 84)

Diagnosis. This species is a member of the Cis multidentatus  group, discussed by Lopes-Andrade (2008) and Lawrence (2016), characterised by the short, broad, convex body, single confused elytral punctation, vestiture of erect bristles, bidentate male pronotum and quadridentate male frontoclypeus, and including the widely introduced pest of dried medicinal fungi, Cis chinensis Lawrence. It  differs from C. chinensis  in its larger size and long, converging male pronotal horns.

Description. With characters of the genus. Body oblong-ovate, strongly convex, with sides more or less conjointly rounded, with a only slight gap between pronotum and elytra. Length = 1.70–2.70 (2.33 ± 0.32, n = 11) mm. BL/EW 1.57–1.74 (1.68); GD/EW = 0.70–0.79 (0.76). Colour of head and pronotum reddish-brown to black, elytra yellowish-brown to black, undersides and legs usually reddish-brown, antennal funicle yellow, antennal club darker; surfaces moderately shiny. Dorsal vestiture single, consisting of moderately long, erect, yellow bristles. Frons and vertex flat or slightly convex in female, anteriorly slightly concave in male, without vertexal sex patch. Longest eye diameter 0.24 times as great as head width. Frontoclypeal ridge in both sexes complete at middle and produced and elevated laterally, forming a pair of very short, rounded plates in female, and quadridentate in male, with a pair of broadly triangular frontal plates flanking a pair of slightly smaller clypeal triangular plates separated by about one basal width. Antennomere length ratio: 5.50: 3.00: 3.12: 1.87: 1.37: 1.25: 1.00: 3.87: 3.62: 5.12; length/width ratios: 1.83, 1.50, 2.08, 1.25, 0.85, 0.67, 0.40. 0.86, 0.83, 1.11. Apical maxillary palpomere 2.50 times as long as wide, widest at at about middle, apex narrowly rounded. Labial palps separated by 0.20 times basal width of one; ratio of palpomere lengths 1.00: 2.83: 2.00, apical palpomere distinctly narrower than preapical one, which is somewhat inflated. Male gula 0.74 times as wide as head, densely filled with micropores, the pores extending anteriorly onto submentum as a very broad, apically rounded patch; female gula 0.52 times as wide as head. Pronotum 0.57–0.66 (0.62) times as long as wide, widest at about middle in both sexes; anterior edge strongly, evenly rounded in female, but sometimes with a very slight median impression; anterior edge in male strongly produced forward to form a pair of long, narrow horns, the apices of which are slightly curved dorsomesally, at least in larger males; lateral margins very narrow, not visible for their entire lengths from above with smooth edges; anterior angles barely produced forward and rounded; posterior angles rounded; posterior edge with very narrow but complete marginal bead; disc evenly convex in females, but slightly concave between and just behind the pair of horns; punctation moderately coarse and very dense, punctures usually separated by half a diameter; interspaces smooth and shiny. Prosternum in front of coxae 0.82 times as long as mid length of procoxal cavity, moderately tumid but without median carina, prosternal process 0.36 times as wide as mid length of coxal cavity, truncate at apex; procoxal cavities very narrowly open; postcoxal process narrowly acute. Elytra 1.02–1.17 (1.08) times as long as wide and 1.67–2.09 (1.82) times as long as pronotum; punctation single and confused, with punctures larger than pronotal punctures and equally dense, the interspaces smooth and shiny. Mesocoxal cavities separated by about 0.05 times shortest diameter of a cavity. Metaventrite slightly convex; discrimen about 0.5 times length of ventrite; shortest distance between meso- and metacoxal cavities about 1.33 times length of abdominal ventrite 1. Outer apical angle of protibia with sharp tooth in both sexes. First abdominal ventrite 1.50 times as long as 2nd; sex patch in male about 0.50 times as long as ventrite 1, located at middle, circular, with distinct rim. Sides of sternite VIII slightly curved and converging, its apex broadly, shallowly emarginate with broadly rounded angles. Pregenital ring moderately broad with subacute apex. Tegmen (Fig. 67–68) 3.75 times as long as wide, widest near apex, sides more or less parallel, only slightly diverging towards apex; apex trilobed, with median lobe longer, narrower, at a different level than lateral lobes and covered with sensilla; lateral lobes slightly shorter and broadly rounded; base narrowly rounded. Penis (Fig. 69) 0.83 times as long as tegmen and 5.43 times as long as wide, sides subparallel but slightly converging to rounded apex; base rounded. Ovipositor (Fig. 84) 4.04 times as long as wide, widest at base with sides barely converging, almost parallel to base of coxites, then gradually converging to apex; paraprocts 1.43 times as long as gonocoxites, longitudinally oriented; gonocoxites 1.61 times as long as their combined widths; proximal lobe about 1.70 times as long as wide, lightly sclerotised, clearly subdivided; distal lobe about 1.18 times as long as proximal lobe, more heavily sclerotised, gradually narrowed to obliquely truncate apex; gonostylus about 0.19 times as long as distal lobe and 5 times as long as wide.

Type specimens: Holotype,  ♂ “ New Guinea (NE) Wau Morobe Distr. 1100m 30.ix.1961 / J. & M. Sedlacek, collectors, BISHOP”/ ANIC Image” (BMH).

Paratypes: Australia: QLD: Claudie River, nr. Iron Range , 19–25.vii.1978, 78-74 JFL, Trichaptum  sp., J. F. Lawrence (2, ANIC)  ; Papua New Guinea: Wau, Morobe District , 1050–1200m, 15–30.IX.1961, J. & M. Sedlacek (4, BMH, ANIC)  ; Indonesia: Java: Pengalengan, Bandung Regency , 400’, 1893, H. Fruhstorfer (1, MNHN)  ; Vietnam: “ Annam ”, 1924, Poilane (4, MNHN, ANIC)  ; Hoa Binh, 1927, A. De Cooman (1, MNHN)  .

Distribution. Southeast Asia, Indonesia, Papua New Guinea, Australia (northern QLD).

Biology. The two Australian specimens were collected from a basidiome of Trichaptum  sp. No host data available for Asian and Indonesian specimens.

Etymology. Derived from the Green rhaibos, meaning bent or bowlegged and keros, meaning horn, and referring to the outwardly bowed pronotal horns in the male.

Note. It is possible that more than one species is represented in this material. The two specimens from Australia are both smaller and lighter in colour (possibly teneral), but until more Australian specimens are collected these are considered to be conspecific with the New Guinea specimens.


Australian National Insect Collection




Museum National d'Histoire Naturelle