Eviulisoma ottokrausi, 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 : 43-45

Eviulisoma ottokrausi sp. nov.

urn:lsid:zoobank.org:act:4AC6017F-F868-4073-9 A 60-61FB1922F8E1

Figs 8C , 20

Diagnosis

Differs from other species of the E. kwabuniense group by having a short subterminal side branch on the map, in combination with having spines on the basal part of the long, slender iap and having the dorsal lobe of the solenophore much longer than the ventral and intermediate lobes.

Etymology

The name honours Otto Kraus (1930–2017) who described the first species of Eviulisoma from the Udzungwa Mountains and authored numerous other papers on myriapod (and arachnid) taxonomy.

Material studied (total: 13 ♂♂)

Holotype TANZANIA: ♂, Iringa Region, Iringa District, New Dabaga/ Ulangambi FR , 08°05′34.5″ S, 35°55′31.3″ E, montane, 1800–1900 m a.s.l., Plot 16, 15–16 Nov. 2000, Frontier Tanzania leg. ( ZMUC).

Paratypes

TANZANIA (all from Iringa Region, Iringa District , New Dabaga/ Ulangambi FR , Frontier Tanzania leg.): 1 ♂, 08°00′26.6″ S, 35°56′06.1″ E, scrub /thicket / bush, 1915 m a.s.l., Plot Kinyonga , 18 Oct. 2000; 1 ♂, 08°03′39.9″ S, 35°54′41.91″ E, montane, 1955 m a.s.l., Plot 24, 2 Nov. 2000; 1 ♂, 08°03′39.9″ S, 35°54′41.91″ E, montane, 1962 m a.s.l., Plot 24, 27 Oct. 2000; 1 ♂, 08°04′05.6″ S, 35°54′13.8″ E, montane, 1940 m a.s.l., Plot 1, 18 Oct. 2000; 2 ♂♂, 08°00′26.6″ S, 35°56′06.1″ E, montane forest, 1910 m a.s.l., Plot Kinyonga , 24 Oct. 2000; 1 ♂, 08°05′34.5″ S, 35°55′31.3″ E, montane, 1800 m a.s.l., Plot 16 , 15 Nov. 2000; 5 ♂♂, 08°04′05.6″ S, 35°54′20.41″ E, montane, 1930 m a.s.l., Plot 6, 27 Oct. 2000 (all in ZMUC) .

Description (male)

SIZE. Length 18 mm, max. width 2.0 mm.

COLOUR. Completely pallid after 17 years in alcohol (probably not due to fading because whereas all adult specimens are pallid, the samples also contain some juveniles, possibly of another species, in which the metazonites have retained a brownish colouration similar to that seen in E. dabagaense ).

ANTENNAE. Reaching back to middle of ring 4.

BODY RINGS. Paranota seen as extremely inconspicuous ridges on ring 2 in one specimen (as Fig. 4C ), completely absent in others. Stricture between pro- and metazonite striolate. A transverse row of setae on all body rings back to ring 9 in one specimen, only on ring 2 in another.

HYPOPROCT. Trapezoid, with three very prominent marginal tubercles.

LEGS. Length 0.8× body width. Relative lengths of podomeres: femur (>) prefemur> tarsus> tibia (>) postfemur. Scopulae strongly developed on femur, postfemur, tibia and tarsus; those on femur missing from posterior legs.

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

STERNUM 6. Deeply excavated, rim of excavation simple.

GONOPODS ( Figs 8C , 20 ). Coxal lobe (cxl) large. Prefemoral part (prf) slightly more than half as long as acropodite; mesal acropodital process (map) long, slender, straight, apically bifurcate; intermediate acropodital process (iap) as long as map, slender, with several long spines on basal half, apically pointed; solenophore (sph) large, ca 0.8× as long as map, folded around solenomere (slm), three-lobed, dorsal lobe (sph-d) longest, subrectangular, ventral lobe (sph-v) large, apically broadly rounded; a small intermediate lobe (sph-i) between sph-d and sph-v.

Distribution and habitat

Known only from the New Dabaga/ Ulangambi FR. Altitudinal range 1800–1962 m a.s.l. Habitats include montane forest and scrub/ thicket/ bush. Collected together with E. kwabuniense Kraus, 1958 .

Remarks

One male infested with nematodes, one worm sticking out from each gonopore.

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. 20. Eviulisoma ottokrausi sp. nov, paratype, left gonopod. A. Mesal view. B. Lateral view. C. Ventral view. D. Acropodite, latero-ventro-apical view. E. Dorsal view. Abbreviations: cxl = coxal lobe; iap = intermediate acropodital process; map = mesal acropodital process; prf = prefemoral part; slm = solenomere; sph-d, sph-i, sph-v = dorsal, intermediate and ventral lobes of solenophore. Scale bars: A–D = 0.1 mm.