Chaleponcus ibis, Enghoff, 2014
Enghoff, Henrik, 2014, A mountain of millipedes I: An endemic species-group of the genus Chaleponcus Attems, 1914, from the Udzungwa Mountains, Tanzania (Diplopoda, Spirostreptida, Odontopygidae), European Journal of Taxonomy 100, pp. 1-75: 44-46
treatment provided by
Chaleponcus ibis sp. nov.
Large. Gonopod coxa ( Fig. 9 View Fig ) without a lateral process; metaplical shelf-spine very long. Telomere with a rugged anterior lamella and posterior lamella ending in short, parallel, elongate lobes. Claws of walking legs surrounded by ‘palisade’ of setae, a character shared only with C. circumvallatus sp. nov.
The name is a noun in apposition and refers to the somewhat ibis bill-like metaplical shelf-spine.
Material studied (total: 1 ♂)
TANZANIA: Iringa Region, Iringa District, Udzungwa Mts, West Kilombero FR, Udekwa village, Nyambanito Mt., Ukami Forest, 07° 42’49” S, 36°25’15” E.
DIAMETER. 3.5 mm, 54 podous rings (the largest of all species in the group).
COLOUR. After 20 years in alcohol ground colour greyish, posterior part of metazonites yellow-brownish; traces of a broad dorsal dark stripe (most other species have traces of a light stripe).
ANAL VALVES. Each with a strong, apparently broken dorsal and smaller, but well-developed ventral spine. Margin raised, setiferous tubercles on ravelins.
LIMBUS. With triangular lobes; lobes ca. as long as wide, margin micro-dentate, outer surface striate.
GONOPOD COXA ( Figs 9 View Fig , 22 View Fig ). Stout, ca. 3 × as long as wide. Lateral margin irregularly convex, continuing in smooth curve in apical margin; cucullus (cu) hence regularly rounded. Metaplica posterio-mesally with triangular process (mp). Metaplical shelf (ms) relatively small, giving rise to very long, slightly curved metaplical shelf-spine (mss). GONOPOD TELOPODITE ( Fig. 22 View Fig ). Solenomere with a very long, straight, mesad proximal spine (ps).
Telomere distally with two branches, both curving anteriad:
• an irregular shaped anterior lamella (al) with coarsely dentate proximal part and a smooth, subrectangular distal part (which maybe corresponds to the accessory lobe, al’¸ in C. circumvallatus sp. nov.),
• a posterior lamella (pl) ending in two short, parallel, elongate lobes.
Distribution and habitat
Known only from Nyambanito Mt. in West Kilombero Scarp FR. No altitude or habitat information.
C. basiliscus sp. nov. was found in the same sample as C. ibis sp. nov. In addition, C. circumvallatus sp. nov., C. gracilior sp. nov., C. netus sp. nov. and C. tintin sp. nov. were found in West Kilombero Scarp FR.
Resembles the almost similar-sized C. circumvallatus sp. nov. both in the unusual tarsal setation and in gonopod structure. C. ibis sp. nov. differs from C. circumvallatus sp. nov., i.a., in having distinct lobes on the limbus, in having the metaplical shelf-spine (mss) much longer, in having the proximal part of the anterior telomeral lobe (al) coarsely dentate, and in having two relatively short, parallel elongate lobes on the posterior telomeral lamella, as opposed to the two very long, diverging spines in C. circumvallatus sp. nov.
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