Eviulisoma navuncus, 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 : 38-40

Eviulisoma navuncus sp. nov.

urn:lsid:zoobank.org:act:91 A53055 -C236-4F4E-A32A-172D2289DE25

Fig.18

Diagnosis

Differs from other species of the E. kwabuniense group by having a long, curved side branch from map fitting over the semicircular dorsal lobe of the solenophore, in combination with an extremely slender, spinose iap.

Etymology

The name is a noun in apposition, from the Latin navis (ʻboatʼ) and uncus (ʻhookʼ), referring to the boathook shape of the mesal acropodital process.

Material studied (total: 7 ♂♂)

Holotype

TANZANIA: ♂, Kitungulu FR, 1500 m a.s.l., 08°09′ S, 36°05′ E, forest, Jan.1996, M. Andersen, P. Gravlund and A. Jakobsen leg. ( ZMUC).

Paratypes

TANZANIA: 6 ♂♂, “ Bomalamzinga, Uzungwa FR, Muhange Village, Uzungwa Mountains ”, 36.03/8.12 [must be longtitude / latitude, but format unknown], 19 Jun. 1979, W. A. Rodgers leg. ( VMNH).

Referred non-type material

TANZANIA: 6 ♀♀, tentatively referred to this species, same collection data as for paratypes ( VMNH). Description (male)

SIZE. Length 22 mm, max. width 2.0 mm.

COLOUR. After 21 years in alcohol uniform whitish yellow, only vertigial region of head and hind edge of body rings very light brown.

ANTENNAE. Reaching back to middle of ring 3.

BODY RINGS. Paranota indicated by very faint keels on body rings 2 (as in Fig. 4C ), otherwise completely absent. Stricture between pro- and metazonite striolate. A transverse row of setae on all body rings.

HYPOPROCT. Trapezoid, with three apical tubercles.

LEGS. Length 0.9 × body width. Relative lengths of podomeres: prefemur = femur> tarsus> postfemur = tibia. Scopulae on femur, postfemur, tibia and tarsus, disappearing towards hind end.

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

STERNUM 6. Deeply excavated. Rim of excavation simple.

GONOPODS ( Fig. 18 ). Coxal lobe (cxl) large. Prefemoral part (prf) ca half as long as acropodite. Mesal acropodital process (map) a long, slightly sinuous rod, with pointed tip and a large, pointed lateral hook subapically; hook curving over dorsal lobe (sph-d) of solenophore. Intermediate acropodital process (iap) very thin, straight, covered in long spines along dorsal side. Solenophore (sph) large, with dorsal lobe (sph-d) largest, broadly rounded, fitting under lateral hook of map, intermediate lobe (sph-i) very small, ventral lobe (sph-v) broadly rounded; internal surface of sph with a coarsely ridged area (ra).

Distribution and habitat

Known from two sites, one in Kitungulu / Kiranzi FR, the other in Udzungwa Scarp FR. Altitudinal range includes 1500 m. Collected together with E. dabagaense Kraus, 1958 and E. nessiteras sp. nov. in Kitungulu / Kiranzi FR.

Remarks

Interpreting the locality name “Bomalamzinga” caused a lot of problems until Andy Marshall (pers. comm.) informed me that it refers to a place at the northern end of the Udzungwa Scarp FR.

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. 18. Eviulisoma navuncus sp. nov., holotype, right gonopod. A. Mesal view. B. Lateral view. C. Ventro-lateral view. D. Ventral view. Aluminium tape used for mounting visible in lower left corner of B. Abbreviations: cxl = coxal lobe; iap = intermediate acropodital process; map = mesal acropodital process; prf = prefemoral part; ra = ridged area of solenophore; slm = solenomere; sph-d, sph-i, sph-v = dorsal, intermediate and ventral lobes of solenophore. Scale bars: 0.1 mm.