Alluviobolus tsimelahy Wesener,

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: 83-85

publication ID 10.3897/zookeys.19.221

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Alluviobolus tsimelahy Wesener

sp. n.

Alluviobolus tsimelahy Wesener  , sp. n.

Material examined: 14 ♂, 21 ♀, 47 imm. Holotype: 1 ♂ (42 mm long), FMMC W017 D, Madagascar, Province Toliara, RNI Andohahela, parcel II, Tsimelahy , gallery forest, in alluvial debris, 24°57.296’ S, 46°37.214’ E, leg. T. Wesener et al., 24.V.2007GoogleMaps  . Paratypes: 4 ♂, 6 ♀, 6 imm., FMMC W017 D, same data as holotypeGoogleMaps  ; 1 ♂, 1 ♀, 2 imm., CAS W017View Materials D, same data as holotypeGoogleMaps  ; 1 ♂, 1 ♀, ZMUC W017View Materials D  ; 1 ♂, 1 ♀, ZMH W017View Materials D, same data as holotypeGoogleMaps  .

Other material examined: 4 ♂, 4 ♀, 10 imm., W017D, same data as type material, but stored as vouchers at University Antananarivo  ; 1 ♂, 4 ♀, 9 imm., FMMC W016 A, Andohahela mountain chain, Ebosika, rainforest, 24°56’45.24” S, 46°40’31.84” E, leg. T. Wesener et al., 15.VI.2007GoogleMaps  ; 1 ♂, 4 ♀, 9 imm., W016A, same data as previous, University AntananarivoGoogleMaps  .

Differential diagnosis: see A. laticlavius  for a differentiation of both taxa. It is possible that Ostinobolus rufus  sp. n. can also be found in the Ebosika rainforest. Both species live in the same habitat and are of similar size and colour. O. rufus  is, however, entirely red ( Fig. 48CView Figure 48) while the mesozonites are dark olive greenish in Alluviobolus tsimelahy  ( Fig. 42AView Figure 42).

Description. Measurements: males with 47–49 body rings, circa 41–44 mm long, 3.6–4.3 mm wide. Females with 47–49 body rings, 52–60 mm long, 5.5–6.0 mm wide.

Coloration on mesozonites dark olive green, metazonites red ( Fig. 42AView Figure 42). Rings dorsally with a slender orange stripe. Head, legs, antennae and telson red ( Figs 45View Figure 45 A–C). Eyes with 22–24 ocelli arranged in 4 or 5 rows ( Fig. 45AView Figure 45). Antennae protruding back to ring 5 ( Fig. 45AView Figure 45).

Male coxal processes on coxae 3–5 ( Fig. 45BView Figure 45), 3 and 4 large, swollen, process on coxa 5 smaller ( Fig. 46BView Figure 46). Preanal process absent ( Figs 45CView Figure 45, 46CView Figure 46).

Anterior gonopod sternite elevated into a wide lobe, apically tapering. Tip wellrounded ( Fig. 45FView Figure 45). Coxite and telopodite inconspicuous ( Fig. 45HView Figure 45).

Posterior gonopods: telopodite with a membranous fringe ( Fig. 45IView Figure 45). Apical sclerite (x in Fig. 45IView Figure 45) slender, triangular, regularly protruding into a slender, acute tip ( Fig. 45GView Figure 45).

Intraspecific variation: specimens from the rainforest of Ebosika show minute differences in the posterior gonopods towards those of the type series (compare Figs 45G, IView Figure 45 with Figs 46J, L, MView Figure 46). Ebosika specimens possess apically on the telopodite a short protruding process towards the membranous fringe ( Fig. 46LView Figure 46, marked with an arrow). However, size, number of body rings, colour pattern and the shape of male coxal processes ( Figs 46View Figure 46 A–C) are identical in specimens from both populations.

Distribution and ecology: A. tsimelahy  is until now the only known Malagasy species of Spirobolida  which occurs in the spiny forest and rainforest ecosystem, more precisely in the spiny forest at Tsimelahy and just 5 km east in the rainforest of Ebosika. The record from the spiny forest of Tsimelahy, however, is tainted, because the only place where Alluviobolus  specimens were found was very close to the river, inside wet debris. It is currently unknown if the A. tsimelahy  specimens from the spiny forest area represent a stable population or whether specimens just floated out of the rainforest and into the spiny forest during the wet season. It is perhaps not a coincident that the specimens from Ebosika were collected close to the same river as those in Tsimelahy ( Fig. 43View Figure 43).

Etymology: tsimelahy  , noun in apposition, after the type locality.


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Zoological Museum, University of Copenhagen


Zoologisches Museum Hamburg