Colossobolus aculeatus Wesener, 2009

Wesener, Thomas, Enghoff, Henrik & Sierwald, Petra, 2009, Review of the Spirobolida on Madagascar, with descriptions of twelve new genera, including three genera of ' fire millipedes' (Diplopoda), ZooKeys 19 (19), pp. 1-128 : 35-37

publication ID 10.3897/zookeys.19.221

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Colossobolus aculeatus Wesener

sp. nov.

Colossobolus aculeatus Wesener View in CoL , sp. n.

Material examined: 2 ♂ Holotype: 1 ♂ (122 mm long), CAS BLF 9555, Madagascar, Province Antsiranana, Forêt de Binara , 7.5 km 230° SW Daraina, 375 m, tropical dry forest, 13°15’18”S, 049°37’00”E, leg. B. L. Fisher, 1.XII.2003 GoogleMaps . Paratype: 1 ♂, same data as holotype GoogleMaps .

Similar species: the special U-shaped posterior gonopods are unique for Colossobolus except for C. pseudoaculeatus sp. n. C. aculeatus differs from the latter in the presence of a sharp-ending preanal process, which is well-rounded in C. pseudoaculeatus sp. n. (compare Fig. 20C View Figure 20 with Fig. 21B View Figure 21 ). The lateral branch of the posterior gonopod telopodite is of equal width all along in C. aculeatus while it is basally slen- der with a swollen tip in C. pseudoaculeatus sp. n. (compare Fig. 20E View Figure 20 with Fig. 21E View Figure 21 ).

Description. Measurements: males with 51 body rings, circa 122 mm long, 9.5 mm wide. Female unknown.

Coloration affected by alcohol. Head, antennae, legs and telson red ( Figs 20 View Figure 20 A–C). Median part of collum dark, margins red ( Fig. 20A View Figure 20 ). Pro- and anterior part of mesozonites dark brown, posterior part of meso- and metazonites red. Antennae protruding back to ring 3. Male coxal processes on coxae 3 and 4 barely visible, on coxae 5–7 absent ( Fig. 20B View Figure 20 ). Preanal process sharp-edged, but not projecting over anal valves ( Fig. 20C View Figure 20 ).

Anterior gonopod sternite elongated into a wide, broadly rounded lobe ( Fig. 20D View Figure 20 ). Mesal process of coxite weakly developed, protruding into a very short wide lobe with

a well-rounded tip. Lobe only slightly longer than sternite ( Fig. 20D View Figure 20 ). Telopodite process long, becoming apically thicker than basally. Mesal margin laterally sharp, not projecting ( Fig. 20F View Figure 20 ).

Posterior gonopods telopodites positioned parallel to one another, generally Ushaped ( Figs 20E, G View Figure 20 ). Coxite branch absent ( Fig. 20E View Figure 20 ). Lateral branch of regular width, tip wide, well-rounded, not thicker than median or basal parts ( Fig. 20E View Figure 20 ). Central membranous area present as a wide, well-rounded knob ( Fig. 20G View Figure 20 ). Main branch slightly longer than lateral branch, latero-apically towards lateral branch with a large membranous area (Fig, 20G).

Distribution and ecology: C. aculeatus is only known from the Forêt Binara ( Fig. 10 View Figure 10 ) where it occurs in close proximity to C. semicyclus .

Etymology: aculeatus , adjective, refers to the sharp-edged preanal process, unique for Colossobolus .

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