Hylekobolus griseus 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: 106-108

publication ID

http://doi.org/ 10.3897/zookeys.19.221

publication LSID

lsid:zoobank.org:pub:C473F9F6-1AE7-4B3F-B17F-CA1C2709010C

DOI

http://doi.org/10.5281/zenodo.3791481

persistent identifier

http://treatment.plazi.org/id/1772122E-786E-FFAD-FF01-3E97ACA6EBC5

treatment provided by

Plazi

scientific name

Hylekobolus griseus Wesener
status

sp. n.

Hylekobolus griseus Wesener  , sp. n.

urn:lsid:zoobank.org:act:7BCC2A1D-F354-4402-8E85-53BF01FCD0A7

Material examined: 24 ♂, 32 ♀, 37 imm. Holotype: 1 ♂ (40 mm long), FMMC W092 A, Vohimena Eastern Slope , Enato, rainforest, 24°53’0.25” S, 46°59’2.77” E, leg. T. Wesener et al., 27.V.2007GoogleMaps  Paratypes: 5 ♂, 5 ♀, 6 imm., FMMC W092 A, same data as holotypeGoogleMaps  ; 1 ♂, 1 ♀, ZMUC W092View Materials A, same data as holotypeGoogleMaps  ; 1 ♂, 1 ♀, ZMH W092View Materials A, same data as holotypeGoogleMaps  ; 1 ♂, 1 ♀, CAS W092View Materials A, same data as holotypeGoogleMaps  ; 1 ♂, 1 ♀ ZSM W092View Materials A, same data as holotypeGoogleMaps  .

Other material examined: 5 ♂, 6 ♀, 6 imm., W092A, same data as holotype, University AntananarivoGoogleMaps  ; 1 ♂, FMMC, Province Toliara, Sainte Luce, S 9, littoral forest on sand, 24°47’S, 47°10’E, leg. T. Wesener, 06.IV.2003GoogleMaps  ; 2 ♂, 2 ♀, 6 imm., FMMC W029, Sainte Luce , S9, littoral forest on sand, 12 m, 24°46.769’ S, 47°10.288’ E, leg. T. Wesener et al., 01.VI.2007GoogleMaps  ; 1 ♂, 3 ♀, 6 imm., W029, same data as previous, University AntananarivoGoogleMaps  ; 2 ♂, 5 ♀, 2 imm. FMMC W038, Mandena , littoral forest on sand, 34 m, 24°57.260’ S, 46°59.499’ E, leg. T. Wesener et al., 02.VI.2007GoogleMaps  ; 2 ♂, 5 ♀, 3 imm., W038, same data as previous, University AntananarivoGoogleMaps  ; 1 ♂, 1 ♀, 4 imm., FMMC W044 B, Andohahela, Malio , rainforest, 24°55.810’ S, 46°46.343’ E, leg. T. Wesener et al., 30.V.2007GoogleMaps  ; 1 ♀, 4 imm., W044B, same data as previous, University AntananarivoGoogleMaps  .

Differential diagnosis: H. griseus  can only be confused with H. albicollaris  sp. n., which shares the small body size and a wide and partly membranous apical process (x) on the posterior gonopods ( Fig. 57GView Figure 57). Both species differ in colour pattern (compare Fig. 57AView Figure 57 with Fig. 58AView Figure 58) and also slightly in the gonopod structure.

Description. Measurements: males with 44–47 rings, 38–45 mm long, 3.5–3.9 mm wide. Females with 44–47 rings, 37–45 mm long, 3.8–4.65 mm wide.

Coloration: collum margins, posterior part of telson and posterior margin of body rings white ( Figs 53BView Figure 53, 57A, EView Figure 57). Legs and antennae white ( Fig. 53BView Figure 53). Anterior part of body rings, telson, head and collum dark grey ( Figs 53BView Figure 53, 57A, EView Figure 57). Eyes with 36–40 ocelli ( Fig. 57CView Figure 57).

Anterior gonopod sternite basally wide, apically elevated into a slender, triangular lobe with a well-rounded tip ( Fig. 57EView Figure 57). Mesal process of coxite slender and protruding ( Fig. 57EView Figure 57). Apical telopodite process large and well-rounded. Retrorse margin wide, not projecting above telopodite ( Fig. 57GView Figure 57); margin basally of apical process wide, projecting ( Fig. 57GView Figure 57).

Posterior gonopods telopodite bent 90° ( Fig. 57FView Figure 57). Lateral margin without a projection (w, Fig. 57FView Figure 57). Apical process (x) wide, swollen and membranous ( Fig. 57HView Figure 57). A membranous lobe (y) absent ( Fig. 57FView Figure 57). Projection of sperm canal (z) extraordinary long and slender, widely extending beyond apical process ( Fig. 57HView Figure 57).

Distribution and ecology: H. griseus  sp. n. is widely distributed in the southeastern part of the littoral rainforest, as well as on the eastern slopes of the Vohimena Mountains. It also occurs in Malio, located on the eastern slopes of the Anosy Mountains. The absence of H. griseus  from the Ambatotsirongorongo Mountain, which lies in the middle of its range, is enigmatic ( Fig. 54View Figure 54). At Ambatotsirongorongo, as well as on the western slopes of the Vohimena Mountains and in the Andohahela Isaka-Ivondro corridor, H. griseus  is replaced by H. albicollaris  sp. n. All specimens were collected in dead wood, as well as in mould which assembled in the axis of Pandanus  leaves.

Etymology: griseus  , adjective, refers to the dark grey colour of this species.

ZMUC

Zoological Museum, University of Copenhagen

ZMH

Zoologisches Museum Hamburg

CAS

California Academy of Sciences

ZSM

Bavarian State Collection of Zoology