Eviulisoma articulatum, 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 : 67-69

Eviulisoma articulatum sp. nov.

urn:lsid:zoobank.org:act:FD505E16-0 A 0E-47FB-AB2D-5200D8346CF2

Fig. 33

Diagnosis

Differs from all other Eviulisoma species, except E. iuloideum and E. lanceolatum , by the obviously articulated gonopod acropodite. Very similar to E. iuloideum , with which it shares the very large, subrectangular solenophore, but differs from that species by having a pointed, tapering mesal acropodite process (map) with a subapical side branch (vs map cylindrical, not tapering and without a side branch), as well as by having a rounded trapezoid, tritubercuate hypoproct (vs a triangular hypoproct).

Etymology

The specific epithet is an adjective referring to the articulated gonopod acropodite.

Material studied (total: 1 ♂)

Holotype

TANZANIA: ♂, Iringa Region, Iringa District, Kalimbasi Mountain , 2000–2100 m a.s.l., 10 km S of Mazombe , forest floor, Jan. 1984, J. Kielland leg. (VMNH).

Description (male)

SIZE. Length 18 mm, max. width 1.9 mm.

COLOUR. Completely pallid after 33 years in alcohol.

ANTENNAE. Reaching back to middle of ring 3.

BODY RINGS. Paranota completely absent. Stricture between pro- and metazonite faintly striolate. A transverse row of setae on all body rings.

HYPOPROCT. Rounded trapezoid, with three poorly developed tubercles.

LEGS. Stout, length 0.8 × body width. Relative lengths of podomeres: femur> prefemur> tarsus> postfemur> tibia. Scopulae very well-developed, on femur, postfemur, tibia and tarsus, absent from femur only on posteriormost leg pairs.

STERNUM 5. A rounded-rectangular process, between legs 4.

STERNUM 6. Deeply excavated. Lateral rims of excavation simple.

GONOPODS ( Fig. 33 ). Coxal lobe (cxl) moderate. Prefemoral part (prf) ca half as long as acropodite. Acropodite with a separate basal part (ʻfemoriteʼ, fet) separated from apical part by an arched articulation at ca ⅓ of its length. Mesal acropodital process (map) simple, stout, slightly arched, tapering, apically pointed, with a small laterad subapical side branch (sb). Solenophore (sph) a very large subrectangular sheet, almost as long as map, distal margin in lateral view ( Fig. 33B ) oblique with a small triangular tooth in middle. Internal surface ( Fig. 33E ) with a deeply ridged area (ra).

Distribution and habitat

Known only from Kalimbasi Mountain, S of Mazombe town, 2000–2100 m a.s.l. The site is located in the Kisinga-Rugaro FR.

Figures

Fig. 33. Eviulisoma articulatum sp. nov., holotype, right gonopod. A. Mesal view. B. Lateral view. C. Ventral view. D. Dorsal view. E. Acropodite, distal (-anterior) view. Abbreviations: cxl = coxal lobe; fet = ʻfemoriteʼ; map = mesal acropodital process; ra = ridged area on internal surface of sph; sb = side branch of map; slm = solenomere; sph = solenophore. Scale bars: A–D= 0.1 mm; E = 0.05 mm.