Eviulisoma coxale Enghoff 2018, sp. nov.
Creators: name: Enghoff, Henrik
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplopoda
Polydesmida
Paradoxosomatidae
Eviulisoma
Eviulisoma coxale

description: E viulisoma coxale sp. nov.
urn:lsid:zoobank.org:act:10D5E316-6E8F-4 A 38-8D58-197DDA963339
Figs 3B, 6F, 7E–F, 23
Diagnosis
Differs from other species of the E. dabagaense group, except E. culter sp. nov., by having a distolateral process on the gonopod coxa. Differs from E. culter sp. nov. by having map with two strong apical denticles and several small denticles along the dorsal margin.
Etymology
The name, an adjective, refers to the peculiar modification of the gonopod coxa.
Material studied (total: 7 ♂♂)
Holotype TANZANIA: ♂, Iringa Region, Mahenge District, West Kilombero Scarp FR, Nyambanitu Mts, S of Udekwa Village, 07°48′ S, 36°21′ E, 1500 m a.s.l., Dec. 1993, J.O. Svendsen leg. (ZMUC).
Referred non-type material
TANZANIA: 2 ♀♀, tentatively referred to this species, same collection data as for holotype (ZMUC); 1 ♂, Morogoro Region, Mwanihana FR, 1800–1850 m a.s.l., 28–29 Sep. 1984, litter in montane forest, N. Scharff leg. (ZMUC); 1 ♂, same collection data as preceding, but 1650 m a.s.l., 25–29 Sep. 1984, pitfall trap in montane rain forest (ZMUC); 1 ♂, same collection data as preceding, but 1400–1650 m a.s.l., montane rain forest (ZMUC); 1 ♂, Mwanihana Forest above Sanje, 1650 m a.s.l., 18 Aug. 1982, litter, M. Stoltze and N. Scharff leg. (ZMUC); 1 ♀ (tentatively assigned), 2 ♂♂, Morogoro Region, Udzungwa Mts National Park, Mito Mitatu, Plot 15, 07°49′39.8″ S, 36°50′26.0″ E, 1552 m a.s.l., 27 Nov. 2014, pitfall trapping, J. Malumbres-Olarte leg., sample codes 15 PT6 and 15 PT8 (ZMUC).
Description (holotype, male)
SIZE. Length 22 mm, max. width 2.0 – 2.5 mm.
COLOUR (Fig. 3B). Specimen from Nyambanitu Mts after 24 years in alcohol pallid, except collum and large lateral spots on body rings brownish, on poriferous rings the spots cover the ozopore. Specimens from Mito Mitatu and Mwanihana FR almost all pallid.
ANTENNAE. Reaching back to middle of ring 4.
BODY RINGS. Paranota absent, except for barely discernible keels on ring 2 (as in Fig. 4C). Stricture between pro- and metazonite indistinctly striolate. A transverse row of setae on most body rings (probably abraded where absent).
HYPOPROCT. Rounded-trapezoidal, without distinct tubercles.
LEGS. Length 1.3× body width. Relative lengths of podomeres: femur> prefemur = tarsus> tibia> postfemur. Scopulae (Fig. 7E–F) on anterior legs on femur, postfemur, tibia and tarsus, diminishing and eventually disappearing on more posterior legs, especially on femur.
STERNUM 5. A rounded-trapezoidal process between legs 4 (Fig. 6F).
STERNUM 6. Deeply excavated, rim simple.
GONOPODS (Fig. 23). Coxa with a long, digitiform distolateral process (cxp). Other gonopodal characters as in E. dabagaense: coxal lobe (cxl) moderate; prefemoral part (prf) ca 0.25 × as long as acropodite; mesal acropodital process (map) lamelloid, straight, with parallel margins, tip of process with two strong denticles, a row of smaller denticles along apical part of dorsal margin; solenophore (sph) a rolled sheet, separated from map by a distinct gap, less than ⅔ × as long as map, forming a tube with two small apical denticles and a slender process ca at mid-length.
Specimens from Udzungwa Mts National Park
Similar to type specimens, except as follows:
SIZE. Length 25 mm, max. width 2.5 mm.
COLOUR. Overall pallid after 3 years in alcohol; only head and collum slightly ochre-yellow; a small brown patch between antennae.
ANTENNAE. Reaching back to middle of ring 4. Antennomeres 2–6 subequal.
Distribution and habitat
Known from two sites in the Udzungwa Mts National Park. Altitudinal range 1400–1850 m a.s.l. Habitat: montane rain forest. Collected in litter and pitfall traps, together with E. breviscutum sp. nov. in Mwanihana Forest.
Remarks
This species is very similar to E. dabagaense, but differs in the presence of a distolateral finger-formed process on the gonopod coxa, the latter character being shared with E. culter sp. nov. There are several females and juveniles in the same sample as the holotype, in addition to the listed females. They agree with the holotype in all non-sexual characters except that they are uniformly pale. Whether this is due to fading of the large lateral spots seen in the holotype, or to the possibility that they represent a different species, is difficult to say. Several specimens from Udzungwa Mountains National Park carry large lumps of an amorphous mass (see Discussion) on the tip of process map (Fig. 23E). These specimens are slightly larger than the holotype and they do not have large lateral spots on the body rings, but these differences hardly warrant the recognition of a separate species.
description: Published as part of 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), pp. 1-90 in European Journal of Taxonomy 445 on pages 50-52, DOI: 10.5852/ejt.2018.445, http://zenodo.org/record/1489598