Eviulisoma acaciae, 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 : 22-24

Eviulisoma acaciae sp. nov.

urn:lsid:zoobank.org:act:B769088A-0401-43BD-82F9-09537DA86B49

Figs 6C , 10

Diagnosis

Differs from other species of the E. kwabuniense group by the combination of a map ending in two equal, parallel prongs, a spinose iap and a two-lobed solenophore with a dorsal lobe reaching tip of acropodital processes.

Etymology

This species is named after the dominant tree at the type locality.

Material studied (total: 5 ♂♂)

Holotype TANZANIA: ♂, Iringa Region, Iringa District, West Kilombero Scarp FR , 07°45′34.2″ S, 36°26′37.4″ E, (open) woodland, 1510 m a.s.l., Plot Acacia , 5 Dec. 2000, Frontier Tanzania leg. ( ZMUC) .

Paratypes TANZANIA: 4 ♂♂, same collection data as for holotype, except 7 Dec. 2000 ( ZMUC).

Description (male)

SIZE. Length unmeasurable, all specimens broken, max. width 2.0 mm.

COLOUR. After 17 years in alcohol whitish to pale yellowish, dorsal half of metazonites very faintly light brown in some specimens.

ANTENNAE. Reaching back to end of ring 3.

BODY RINGS. Paranota represented by very faintly developed keels on body ring 2 (as in Fig. 4C ), otherwise completely absent. Stricture between pro- and metazonite not striolate. A transverse row of setae on all body rings, but many setae abraded.

HYPOPROCT. Trapezoid, almost rectangular, with three strong marginal tubercles.

LEGS. Length 1.1× body width. Relative lengths of podomeres: femur> prefemur> tarsus> tibia> postfemur. Scopulae on femur, postfemur, tibia and tarsus, diminishing towards posterior and present on tibia and tarsus only on posteriormost legs.

STERNUM 5. A tongue-shaped process between legs 4.

STERNUM 6 ( Fig. 6C ). Deeply excavated. Rim of excavation simple.

GONOPODS ( Fig. 10 ). Coxal lobe (cxl) large. Prefemoral part (prf) ca ⅓ as long as acropodite. Mesal acropodital process (map) a rather stout rod, apically expanded and ending in two equal, stout, pointed tines. Intermediate acropodital process (iap) a slender straight rod, as long as map, densely covered in spines on mesal and ventral surfaces, except basally and apically. Solenophore (sph) large, deeply divided into two broad lobes, dorsal lobe (sph-d) as long as map, apically with a few minute teeth, ventral lobe (sph-v) much shorter, broadly rounded, curved around solenomere (slm).

Distribution and habitat

Known only from West Kilombero Scarp FR, (open) woodland, 1510 m a.s.l. As implied by the plot name on the label (“Plot Acacia ”) the vegetation is open Acacia woodland (cf. Doody et al. 2001: 27, 174). Collected together with E. grumslinglak sp. nov.

Figures

Fig. 4. Eviulisoma spp. A–B. E. paradisiacum sp. nov., ♂. A. Head and rings 1–8, lateral view. B. Head and collum, frontal view. C. E. Zebra sp. nov., ♂, head and rings 1–3, lateral view. Abbreviation: pn = paranotum. Scale bars: 0.2 mm.

Fig. 6. Eviulisoma spp., male sternum 5 with lobe between 4th legs and sternum 6 with excavation. A–B. E. ejti sp. nov., paratype, sternum 5 and 6. A. Ventral view. B. Sub-posterior view. C. E. acaciae sp. nov., paratype, sternum 6, ventral view. D–F. Sternum 5 lobe, posterior view. D. E. chitense sp. nov., paratype. E. E. dabagaense Kraus, 1958, specimen from Udzungwa Scarp FR, above Chita Village. F. E. coxale sp. nov., specimen from Mito Mitatu. Abbreviation: am = amorphous mass. Scale bars: A–C = 0.2 mm; D = 0.05 mm; E–F = 0.1 mm.

Fig. 10. Eviulisoma acaciae sp. nov., paratype, left gonopod. A. Mesal view. B. Ventral view. C. Lateral view. D. Acropodite, apical (anterior) view. E. Tip of solenophore, dorso-apical view. Abbreviations: cxl = coxal lobe; iap = intermediate acropodital process; map = mesal acropodital process; prf = prefemoral part; slm = solenomere; sph-d, sph-v = dorsal and ventral lobes of solenophore. Scale bars: A–C = 0.1 mm; D–E = 0.05 mm.