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

Eviulisoma sternale sp. nov.

urn:lsid:zoobank.org:act:C1C01D8B-4082-4DF2-83F0-FB8F444CF9F7

Figs 26–27

Diagnosis

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.

Etymology

The name is an adjective referring to the modified 6th male sternum.

Material studied (total: 1 ♂)

Holotype

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) .

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) .

Description (male)

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 ); also present, but poorly developed, on femur and postfemur. Prefemur and femur of post-gonopodal legs ventrally smooth, almost hairless ( Fig. 26B ).

STERNUM 5. A bell-shaped process between coxae 4.

STERNUM 6 ( Fig. 26 A ). Deeply excavated. Lateral rims of excavation produced into two lobes on each side, one lobe at basis of each leg.

GONOPODS ( 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.

Remarks

The ventrally smooth prefemora and femora is an unusual feature of this species, shared only with E. kangense sp. nov. (see Discussion).

Figures

Fig. 26. Eviulisoma sternale sp. nov., holotype. A. Ventral side of 6 th body ring with right side legs, showing lobed rim of excavation. B. Post-gonopodal leg, showing smooth prefemur and femur. C. Pregonopodal leg, showing scopula. Scale bars: 0.1 mm.

Fig. 27. Eviulisoma sternale sp. nov., holoype, right gonopod. A. Mesal view. B. Ventral view. C. Tip of mesal acropodital process (map), ventral view. D. As C, dorsal view. E. Lateral view. Abbreviations: cxl = coxal lobe; dr = dentate ridge; map = mesal acropodital process; prf = prefemoral part; sph = solenophore; tn1, tn2, tn3 = apical tines of process map. Scale bars: 0.1 mm.