Cladophorus bicolor Kleine, 1926

Bocak, Ladislav, 2017, Species delimitation of colour polymorphic Cladophorus (Coleoptera: Lycidae) from New Guinea, Zootaxa 4320 (3), pp. 505-522 : 509-510

publication ID	https://doi.org/ 10.11646/zootaxa.4320.3.6
publication LSID	lsid:zoobank.org:pub:Ca50E5A5-B417-4000-B67D-5F6028Da9154
DOI	https://doi.org/10.5281/zenodo.6018014
persistent identifier	https://treatment.plazi.org/id/A312190F-EC11-FF86-509F-3A75BF9BFAE4
treatment provided by	Plazi
scientific name	Cladophorus bicolor Kleine, 1926
status

Treatment

( Figs. 1–2 View FIGURES 1 – 3. 1 – 2 , 6, 20 View FIGURES 6 – 32 , 33–36, 50–54 View FIGURES 33 – 52 View FIGURES 53 – 78 )

Cladophorus bicolor Kleine, 1926: 129 .

Type material. Paratypes, 2 males, New Guinea, Idenburg River [= Taritatu River ] ( MIZW). Further material examined . Indonesia, Papua Prov.: 10 males, 1 female, Tikapura , 2200 m, 03°47´S 138°43´E (Voucher Numbers JB 0352–62) GoogleMaps ; 3 males, Indonesia, Papua Prov., 3 km N Bokondini , 1800 m, 03°40´S 138°40´E (JB0113, JB0226– 7) GoogleMaps ; 2 males, Indonesia, Papua Prov., 3 km SW Bokondini , 2100 m, 03°43´S 138°39´E (JB0188–9, all LMBC). GoogleMaps

Diagnosis. Cladophorus bicolor is colour polymorphic and we identified four colour forms, which differ in the extent and hue of the light coloured patch in elytra ( Figs. 1–2 View FIGURES 1 – 3. 1 – 2 , 33–36 View FIGURES 33 – 52 ). The most common form has small basal and apical parts of the elytra dark coloured and the brightly yellow area covers about 9/10 of the elytral surface ( Fig. 33 View FIGURES 33 – 52 ); further forms are described below ( Figs. 34–36 View FIGURES 33 – 52 ). Cladophorus bicolor has the characteristic shape of the phallus which is only gradually acuminate apically; the apical quarter of phallic length is widest and the apical process is slender but quite short ( Figs. 53–54 View FIGURES 53 – 78 ). The molecular analysis showed that C. pallescens is the closest relative and it differs in the metallically blue pronotum, uniformly yellow elytra, long antennal lamellae, and the short, robust phallus with a triangular apical part ( Figs. 15, 29 View FIGURES 6 – 32 , 46 View FIGURES 33 – 52 , 71–72 View FIGURES 53 – 78 ).

Description. Male. Body large, 14.2–16.1 mm long, dark brown to black, only middle 9/10 of elytra yellow ( Figs. 20 View FIGURES 6 – 32 , 33 View FIGURES 33 – 52 ), transition between dark and light coloured parts of elytra gradual ( Fig. 51 View FIGURES 33 – 52 ). Head small, with hemispherically prominent eyes, frontal interocular distance 1.52 times maximum eye diameter; antennae long, reaching beyond middle of elytral length if inclined, flabellate, antennomere 3 with lamella 2.2 times longer than stem of antennomere ( Fig. 6 View FIGURES 6 – 32 ). Pronotum slightly transverse, 1.3 times wider than long at midline, lateral margins slightly elevated, frontal margin rounded, frontal angles well marked, posterior angles sharply prominent, posterolateral carinae weak ( Fig. 20 View FIGURES 6 – 32 ). Elytra flat, slightly widened posteriorly, transverse costae weak, partly covered by pubescence, elytral areoles slightly transverse ( Figs. 50–52 View FIGURES 33 – 52 ). Phallus robust, widest in apical fourth, gradually acuminate apically and with slender apical process ( Figs. 53–54 View FIGURES 53 – 78 ). Female. Body slightly wider, antennae acutely serrate.

Colour variability. The extent and hue of the light coloured part of elytra are highly variable. Most specimens were coloured as in Figs. 1 View FIGURES 1 – 3. 1 – 2 and 33 View FIGURES 33 – 52 , two specimens had the apical quarter of elytra and only a very small humeral part dark coloured ( Fig. 35 View FIGURES 33 – 52 ), four specimens had a yellow patch occupying about one quarter of the elytral length ( Figs. 2 View FIGURES 1 – 3. 1 – 2 , 36 View FIGURES 33 – 52 ) and four specimens had a dark brown patch in the basal part of elytra. The extent of the dark brown patch varies between a half and a quarter of elytral length ( Fig. 34 View FIGURES 33 – 52 ). Cladophorus bicolor was recorded in two localities: the vicinity of Bokondini (3 forms) and Tikapura (all four forms). The forms with the extensive yellow patch ( Figs. 33, 35 View FIGURES 33 – 52 ) are similar in principle, but individual specimens can be quite easily categorized to discrete forms and the variability of the extent of the apical black part is limited at least in the available material.

Measurements. BL 14.2–16.1 mm, PL 1.95–2.05 mm, PW 2.65–2.75 mm, WH 1.60–1.75 mm, LE 12.0– 13.5 mm, Edist 0.96 mm, Ediam 0.63 mm, antennomere 3: stem 1.0 mm, lamella 2.2 mm.

Distribution. New Guinea, Central Mts, Tolikara a Central Mamberamo regencies ( Fig. 3 View FIGURES 1 – 3. 1 – 2 ).