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)
Author
Enghoff, Henrik
text
European Journal of Taxonomy
2018
2018-06-19
445
1
90
journal article
10.5852/ejt.2018.445
5dfd4ff4-6c8b-47f4-9aa7-0f6b1b2af967
1489598
852A3F68-B728-413A-B12E-56F306D56C35
Eviulisoma sternale
sp. nov.
urn:lsid:zoobank.org:act:C1C01D8B-4082-4DF2-83F0-FB8F444CF9F7
Figs 26–27
Diagnosis
Differs from other species of the
E. sternale
group by its smaller size (width 2.0 mm, vs 3.0–
3.2 mm
in other species) and by having an apical dentate ridge on
map
.
Etymology
The name is an adjective referring to the modified 6th male sternum.
Material studied
(total: 1 ♂)
Holotype
TANZANIA
:
♂
,
Iringa Region
,
Udzungwa Mts
,
West Kilombero Scarp FR
,
Ndundulu Forest
07°46′ S
,
36°29′ E
,
Waller’s camp
,
tropical semi-evergreen forest
,
1550 m
a.s.l.
,
1–12 Jan. 2007
,
L.A. Hansen
and
local assistants
leg. (
ZMUC
)
.
Referred non-type material
TANZANIA
:
2 ♀♀
, same collection data as for holotype (ZMUC)
;
1 ♀
,
3 juv.
, same collection data as for holotype, but
Dec. 2006
(ZMUC)
.
Description
(male)
SIZE. Length
23 mm
, max width 2.0 mm.
COLOUR. After 10 years in alcohol, overall impression: contrasting dark and pale transverse bands. Head brown; collum black; prozonites yellowish white; metazonites black; antennae and legs light yellow; telson brown, darker (black) dorsally.
ANTENNAE. Reaching back to middle of ring 4.
BODY RINGS. Paranota completely absent. Stricture deep, broad, smooth. Setae absent, except for a middorsal pair on ring 2.
HYPOPROCT. Semicircular, no distinct tubercles.
LEGS. Length 1.5× body width. Relative lengths of podomeres: femur> tarsus> prefemur> tibia> postfemur. Scopulae present on tibia and tarsus on pre-gonopodal legs (
Fig. 26C
); also present, but poorly developed, on femur and postfemur. Prefemur and femur of post-gonopodal legs ventrally smooth, almost hairless (
Fig. 26B
).
STERNUM 5.
A
bell-shaped process between coxae 4.
STERNUM 6 (
Fig. 26
A
). Deeply excavated. Lateral rims of excavation produced into two lobes on each side, one lobe at basis of each leg.
GONOPODS (
Fig. 27
). Coxal lobe (
cxl
) moderately developed. Prefemoral part (
prf
) ca half as long as acropodite. Mesal acropodital process (
map
) long, straight, stout, with a deep, broad furrow on apical part of mesal surface, apically with three stout, triangular tines (
tn1, tn2, tn3
) and a transverse, dentate ridge (
dr
). Solenophore (
sph
) a simple rolled sheet, considerably shorter than process
map
, apically with two small processes.
Distribution and habitat
Known only from the
West
Kilombero Scarp FR, Ndundulu Forest,
1550 m
a.s.l. Habitat: tropical semievergreen forest. Collected together with
E. grumslingslak
sp. nov.
Fig. 26.
Eviulisoma sternale
sp. nov.
, holotype.
A
. Ventral side of 6th body ring with right side legs, showing lobed rim of excavation.
B
. Post-gonopodal leg, showing smooth prefemur and femur.
C
. Pregonopodal leg, showing scopula. Scale bars: 0.1 mm.
Remarks
The ventrally smooth prefemora and femora is an unusual feature of this species, shared only with
E. kangense
sp. nov.
(see Discussion).