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.2007 GoogleMaps   Paratypes: 5 ♂, 5 ♀, 6 imm., FMMC W092 A, same data as holotype GoogleMaps   ; 1 ♂, 1 ♀, ZMUC W092 View Materials A, same data as holotype GoogleMaps   ; 1 ♂, 1 ♀, ZMH W092 View Materials A, same data as holotype GoogleMaps   ; 1 ♂, 1 ♀, CAS W092 View Materials A, same data as holotype GoogleMaps   ; 1 ♂, 1 ♀ ZSM W092 View Materials A, same data as holotype GoogleMaps   .

Other material examined: 5 ♂, 6 ♀, 6 imm., W092A, same data as holotype, University Antananarivo GoogleMaps   ; 1 ♂, FMMC, Province Toliara, Sainte Luce, S 9, littoral forest on sand, 24°47’S, 47°10’E, leg. T. Wesener, 06.IV.2003 GoogleMaps   ; 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.2007 GoogleMaps   ; 1 ♂, 3 ♀, 6 imm., W029, same data as previous, University Antananarivo GoogleMaps   ; 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.2007 GoogleMaps   ; 2 ♂, 5 ♀, 3 imm., W038, same data as previous, University Antananarivo GoogleMaps   ; 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.2007 GoogleMaps   ; 1 ♀, 4 imm., W044B, same data as previous, University Antananarivo GoogleMaps   .

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. 57G View Figure 57 ). Both species differ in colour pattern (compare Fig. 57A View Figure 57 with Fig. 58A View 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 53B View Figure 53 , 57A, E View Figure 57 ). Legs and antennae white ( Fig. 53B View Figure 53 ). Anterior part of body rings, telson, head and collum dark grey ( Figs 53B View Figure 53 , 57A, E View Figure 57 ). Eyes with 36–40 ocelli ( Fig. 57C View Figure 57 ).

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

Posterior gonopods telopodite bent 90° ( Fig. 57F View Figure 57 ). Lateral margin without a projection (w, Fig. 57F View Figure 57 ). Apical process (x) wide, swollen and membranous ( Fig. 57H View Figure 57 ). A membranous lobe (y) absent ( Fig. 57F View Figure 57 ). Projection of sperm canal (z) extraordinary long and slender, widely extending beyond apical process ( Fig. 57H View 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. 54 View 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