Hylekobolus brachiosauroides 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 : 102-104

publication ID

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

publication LSID

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

DOI

https://doi.org/10.5281/zenodo.3791465

persistent identifier

https://treatment.plazi.org/id/40FD10B2-63FB-4627-AAAC-6961BE9102E5

taxon LSID

lsid:zoobank.org:act:40FD10B2-63FB-4627-AAAC-6961BE9102E5

treatment provided by

Plazi

scientific name

Hylekobolus brachiosauroides Wesener
status

sp. n.

Hylekobolus brachiosauroides Wesener, sp. n.

urn:lsid:zoobank.org:act:40FD10B2-63FB-4627-AAAC-6961BE9102E5

Material examined: 26 ♂, 21 ♀, 6 imm. Holotype: 1 ♂ (55 mm long), FMMC W089 , Vohimena Mountains , West slope, Ivorona, 114 m, rainforest, 24°50.026’ S, 46°56.943’ E, leg. Wesener et al., 23.V.2007 GoogleMaps . Paratypes: 3 ♂, 4 ♀, FMMC W089 , same data as holotype GoogleMaps ; 1 ♂, 1 ♀, ZMUC W089 View Materials , same data as holotype GoogleMaps ; 1 ♂, ZMH W089 View Materials , same data as holotype GoogleMaps ; 1 ♂, 1 ♀, CAS W089 View Materials , same data as holotype GoogleMaps ; 1 ♂, ZSM W089 View Materials , same data as holotype GoogleMaps .

Other material examined: 4 ♂, 4 ♀, W089, same data as holotype, voucher specimens deposited at the University Antananarivo GoogleMaps ; 5 ♂, 4 ♀, 2 imm., FMMC W049 B, Andohahela, Isaka-Ivondro Sud , 46 m, rainforest, 24°49.690’ S, 46°51.971’ E, leg. Wesener et al., 08.VI.2007 GoogleMaps ; 5 ♂, 4 ♀, 2 imm., W049B, same data as previous, voucher specimens deposited at the University Antananarivo GoogleMaps ; 2 ♂, 2 ♀, FMMC W099 , Ambatotsirongorongo Mountain, Grand Lavasoa , rainforest, 25°5’10.23” S, 46°44’55.93” E, rainforest, leg. Wesener et al., 14.VI.2007 GoogleMaps ; 2 ♂, 1 ♀, 2 imm., W099, same data as previous, voucher specimens deposited at the University Antananarivo GoogleMaps .

Differential diagnosis: H. brachiosauroides differs in size and colour from the sympatric living H. albicollaris sp. n. The posterior gonopods ( Figs 55M, O View Figure 55 ) of H. brachiosauroides differ from other, same-sized Hylekobolus species: the lateral margin carries a thick, swollen, well-rounded projection ( Fig. 55M View Figure 55 ), a feature only shared with H. montanus sp. n. H. brachiosauroides differs from H. montanus sp. n. in the presence of a protruding apical process (x) on the posterior gonopods, a weakly protruding lateral retrorse process of the anterior gonopod ( Fig. 55N View Figure 55 ), and a different colour pattern.

Description. Measurements: males with 50 or 51 rings, 53–62 mm long, 4.8–5.2 mm wide. Females with 50 or 51 rings, 58–72 mm long, 5.1–6.0 mm wide.

Coloration: anterior part of head and collum, posterior part of telson and posterior margin of body rings lightly red or white ( Figs 53A View Figure 53 , 55A, C View Figure 55 ). Legs and antennae white ( Fig. 53A View Figure 53 ). Anterior part of body rings, telson, posterior part of head and collum black ( Figs 53A View Figure 53 , 55A View Figure 55 ). Eyes with 40–44 ocelli ( Fig. 55D View Figure 55 ).

Anterior gonopod sternite basally wide, apically elevated into a triangular lobe with a triangular, wide, well-rounded tip ( Fig. 55L View Figure 55 ). Mesal process of coxite wide and only slightly protruding ( Fig. 55L View Figure 55 ). Apical process of telopodite large and well-rounded. Retrorse margin wide, not projecting above telopodite margin ( Fig. 55N View Figure 55 ). Margin of apical process basally wide and projecting ( Fig. 55N View Figure 55 ).

Posterior gonopods telopodite bent 90° ( Fig. 55O View Figure 55 ). Lateral margin with a thick, swollen, well-rounded projection (w, Fig. 55M View Figure 55 ). Apical process (x) apically slender, basally with a widely protruding margin ( Fig. 55M View Figure 55 ). Membranous lobe (y) rectangular ( Fig. 55M View Figure 55 ). Projection of sperm canal (z) long and slender, slightly curved towards apical process ( Fig. 55M View Figure 55 ).

Intraspecific variation: coloration of the posterior margin of body ring varies in adults between white and reddish, while it is always white in imm..

Distribution and ecology: this species was found in the isolated Ambatotsirongorongo Mountain, the Andohahela Isaka-Ivondro corridor as well as on the western slopes of the Vohimena Mountain ( Fig. 54 View Figure 54 ). H. brachiosauroides could not be collected north of the Isaka-Ivondro corridor, where H. goodmani sp. n. and H. montanus sp. n. occur. In the eastern Vohimena slopes, H. rufus sp. n. replaces H. brachiosauroides. All individuals were collected inside dead logs.

Etymology: brachiosauroides, adjective, refers to the dinosaur genus Brachiosaurus , whose neck and head closely resemble the general shape of the posterior gonopods of this millipede.

ZMUC

Zoological Museum, University of Copenhagen

ZMH

Zoologisches Museum Hamburg

CAS

California Academy of Sciences

ZSM

Bavarian State Collection of Zoology