Eviulisoma sternale, Enghoff, 2018
Enghoff, Henrik, 2018, A mountain of millipedes VII: The genus Eviulisoma Silvestri, 1910, in the Udzungwa Mountains, Tanzania, and related species from other Eastern Arc Mountains. With notes on Eoseviulisoma Brolemann, 1920, and Suohelisoma Hoffman, 1963 (Diplopoda, Polydesmida, Paradoxosomatidae), European Journal of Taxonomy 445, pp. 1-90 : 57-59
treatment provided by
Eviulisoma sternale sp. nov.
Differs from other species of the E. sternale group by its smaller size (width 2.0 mm, vs 3.0– 3.2 mm in other species) and by having an apical dentate ridge on map.
The name is an adjective referring to the modified 6th male sternum.
Material studied (total: 1 ♂)
TANZANIA: ♂, Iringa Region, Udzungwa Mts, West Kilombero Scarp FR, Ndundulu Forest 07°46′ S, 36°29′ E, Waller’s camp , tropical semi-evergreen forest, 1550 m a.s.l., 1–12 Jan. 2007, L.A. Hansen and local assistants leg. ( ZMUC) GoogleMaps .
Referred non-type material
TANZANIA: 2 ♀♀, same collection data as for holotype (ZMUC) ; 1 ♀, 3 juv., same collection data as for holotype, but Dec. 2006 (ZMUC) .
SIZE. Length 23 mm, max width 2.0 mm.
COLOUR. After 10 years in alcohol, overall impression: contrasting dark and pale transverse bands. Head brown; collum black; prozonites yellowish white; metazonites black; antennae and legs light yellow; telson brown, darker (black) dorsally.
ANTENNAE. Reaching back to middle of ring 4.
BODY RINGS. Paranota completely absent. Stricture deep, broad, smooth. Setae absent, except for a middorsal pair on ring 2.
HYPOPROCT. Semicircular, no distinct tubercles.
LEGS. Length 1.5× body width. Relative lengths of podomeres: femur> tarsus> prefemur> tibia> postfemur. Scopulae present on tibia and tarsus on pre-gonopodal legs ( Fig. 26C View Fig. 26 ); also present, but poorly developed, on femur and postfemur. Prefemur and femur of post-gonopodal legs ventrally smooth, almost hairless ( Fig. 26B View Fig. 26 ).
STERNUM 5. A bell-shaped process between coxae 4.
STERNUM 6 ( Fig. 26 A View Fig. 26 ). Deeply excavated. Lateral rims of excavation produced into two lobes on each side, one lobe at basis of each leg.
GONOPODS ( Fig. 27 View Fig. 27 ). Coxal lobe (cxl) moderately developed. Prefemoral part (prf) ca half as long as acropodite. Mesal acropodital process (map) long, straight, stout, with a deep, broad furrow on apical part of mesal surface, apically with three stout, triangular tines (tn1, tn2, tn3) and a transverse, dentate ridge (dr). Solenophore (sph) a simple rolled sheet, considerably shorter than process map, apically with two small processes.
Distribution and habitat
Known only from the West Kilombero Scarp FR, Ndundulu Forest, 1550 m a.s.l. Habitat: tropical semievergreen forest. Collected together with E. grumslingslak sp. nov.
The ventrally smooth prefemora and femora is an unusual feature of this species, shared only with E. kangense sp. nov. (see Discussion).
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