Eviulisoma culter, 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 : 52-53

Eviulisoma culter sp. nov.

urn:lsid:zoobank.org:act:AB9254B1-5D83-4B68- A 56C-6ED62B509286

Figs 8B , 24

Diagnosis

Differs from other species of the E. dabagaense group by lacking denticles on the dorsal and ventral margins of map.

Etymology

The name is a noun in apposition, meaning ʻknifeʼ in Latin and referring to the shape of the mesal acropodital process (map).

Material studied (total: 5 ♂♂)

Holotype

TANZANIA: ♂, Dodoma Region, Mpwapwa District, Rubeho Mts (48 km W of Kilosa), Mangalisa Peak , 2100 m a.s.l., 26 Feb.1984, J. Kielland leg. (VMNH).

Paratypes

TANZANIA: 4 ♂♂, same collection data as for holotype (VMNH, ZMUC).

Description (male)

SIZE. Length up to 27 mm (smallers specimens incomplete), max. width 2.2–2.4 mm.

COLOUR. After 33 years in alcohol uniformly yellowish, probably faded.

ANTENNAE. Reaching back to middle of ring 4.

BODY RINGS. Paranota absent, except for barely distinguishable keels on ring 2 (as in Fig. 4C ). Stricture between pro- and metazonite smooth. A transverse row of setae on all rings.

HYPOPROCT. Rounded-triangular, without distinct tubercles.

LEGS. Length 1.2× body width. Relative lengths of podomeres: femur> prefemur> tarsus> tibia> postfemur. Scopulae on anterior legs on femur, postfemur, tibia and tarsus; those on femur missing from posterior legs, those on postfemur, tibia and tarsus present almost until end of body.

STERNUM 5. An almost semicircular process between legs 4.

STERNUM 6. Deeply excavated, rim simple.

GONOPODS ( Figs 8B , 24 ). Coxa with a short, triangular distolateral process (cxp); coxal lobe (cxl) small; prefemoral part (prf) ca 0.2× as long as acropodite; mesal acropodital process (map) large, simple, lamelloid, knife-like, gently curved, with basally parallel and apically converging margins, tip of process simple, sharp, dorsal and ventral margins of process without denticles; solenophore (sph) a rolled sheet, less than ⅔ × as long as map, forming a tube with three apical processes ( Fig. 24C ).

Distribution and habitat

Known only from Mangalisa Peak in the Rubeho Mts, 2100 m a.s.l.

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. 8. Gonopods in Eviulisoma spp. A. E. akkariae sp. nov., paratype, right gonopod, colour-coded: light green = coxa; dark green = cannula; light blue = prefemoral part; purplish blue = mesal acropodital process; pink = intermediate acropodital process; orange = solenophore; yellow = solenomere. B. E. culter sp. nov., paratype, right gonopod, solenomere entering solenophore. C. E. ottokrausi sp. nov., paratype, left gonopod, solenomere dislodged from solenophore. Scale bars: A = 0.1 mm; B–C = 0.05 mm.

Fig. 24. Eviulisoma culter sp. nov., paratype, right gonopod. A. Mesal view. B. Ventral view. C. Tip of solenophore, lateral view. D. Lateral view. Abbreviations: cxl = coxal lobe; cxp = coxal process; map = mesal acropodital process; prf = prefemur; slm = solenomere; sph = solenophore. Scale bars: A–B, D = 0.2 mm; C = 0.05 mm.