Pseudotibiozus Demange, 1970 - millipedes of the Eastern Arc Mountains, Tanzania (Diplopoda, Spirostreptida, Spirostreptidae)
Author
Enghoff, Henrik
Author
Larsson, Tobias Berglund
text
Zootaxa
2018
4425
3
541
554
journal article
29986
10.11646/zootaxa.4425.3.7
4e5a28bc-9d7d-4b3f-b526-2fa812aae747
1175-5326
1270435
DE27A002-C0D2-4F96-851B-D0C1C51554B5
Pseudotibiozus zophoribates
sp. nov.
Figs 2 B
,
3 E
,
4 B, C
,
5 B, D
,
8
Diagnosis.
Differs from the only known congener,
P. cerasopus
, by being larger (diameter of males 6.0–
6.6 mm
,
vs.
4.4–4.8 mm
), by having the apical proplical lobe almost semi-circular with a parallel-sided, broadly or rounded mesapical process, and by having the apical lobe of metaplica almost egg-shaped.
FIGURE 3.
Pseudotibiozus
spp., gnathochilarium.
A–D
:
P. cerasopus
, specimen from Udzungwa Mts.
B
: close-up of circled area (
ss
) in A.
C
: close-up of circled area in B.
D
: close-up of squared area in B.
E
:
P. zophoribates
sp. nov.
, paratype. Scales 1 mm (E), 0.2 mm (A), 0.05 mm (B), 0.005 mm (C, D).
Abbreviations:
ll
= lamella lingualis,
mda
= median depressed area of mentum,
sbs
= basal field of stipital setae,
ss
= soft area with stout seta,
st
= stipes.
FIGURE 4.
Pseudotibiozus
spp.
A
:
P. cerasopus
(Attems, 1914)
, specimen from Udzungwa Mts, anterior end. B, C:
P. zophoribates
sp. nov.
, holotype.
B
: anterior end,
C
: telson. Scales 1 mm.
Etymology.
The name is a composite Greek noun in apposition, from zophos (darkness, dusk, also referring to the
West
) and oribates (mountaineer); it refers to the
type
locality, the
West
Usambara Mountains.
Material studied
(total: 2 ♂♂)
Holotype
:
1 ♂
TANZANIA
,
Tanga
,
W Usambara Mts
,
Mazumbai forest
,
4°49’S
,
38°30’E
,
1400–1800 m
asl
,
10–20.xi.1995
, C.E.
Griswold
, N.
Scharff
&
D. Ubick
leg. (
ZMUC
)
Paratype
:
1 ♂
same data (
ZMUC
).
Description. Males.
SIZE. Body length
71–73 mm
. Diameter 6.0–
6.6 mm
. 43 body rings.
COLOUR (preserved specimens). Antennae and legs red, although less intensely so than in preserved specimens of
P. cerasopus
. Prozona and anterior part of metazona yellowish brown, posterior part of metazona dark brown, semi-transparent edge of metazona reddish.
FIGURE 5.
Pseudotibiozus
spp.,
A, B
: first pair of male legs.
C, D
: left gonopod telopodite. A, C:
P. cerasopus
(Attems, 1914)
specimen from Udzungwa Mts. B, D:
P. zophoribates
sp. nov.
, paratype. Scales 0.2 mm (A), 0.5 mm (B—D).
Abbreviations:
atp
= antetorsal process,
cxs
= field of coxosternal setae,
pfl
= prefemoral lobe.
FIGURE 6.
Pseudotibiozus cerasopus
(Attems, 1914)
, specimen from Udzungwa Mts, gnathal lobe of right mandible.
A
: apico-dorsal view.
B
: ventral view.
C
: mesal view.
D
: close-up of pointed pegs (
pp
, circled area in C). Scales 0.1 mm (A–C), 0.005 mm (D).
Abbreviations:
mdl
= meso-dorsal lobe,
mg
= molar groove,
od
= odontomere,
pl
= pectinate lamellae,
pp
= pointed pegs,
ps
= psectromere,
se
= sectile edge of psectromere.
FIGURE 7.
Pseudotibiozus cerasopus
(Attems, 1914)
, specimen from Udzungwa Mts, gonopods.
A
: anterior view.
B
: posterior view.
C
: left telopodite.
D
: proplical setae (circled area in A).
E
: tip of solenomere. Scales 0.2 mm (A, B), 0.1 mm (C), 0.02 mm (D), 0.01 mm (E).
Abbreviations:
aml
= apical metaplical lobe,
apl
= apical proplical lobe,
map
= mesapical process of proplica,
mp
= metaplica,
pp
= proplica,
px
= paracoxite,
sb
= spinelike branch,
slm
= solenomere,
st
= sternum,
tlp
= telopodite.
FIGURE 8.
Pseudotibiozus zophoribates
sp. nov.
, holotype, gonopods (sternum missing).
A
: anterior view.
B
: posterior view.
C
: Tip of left pro- and metaplica.
D
: close-up of squared area in C, outline of antetorsal process traced in black. Scales 0.5 mm (A, B), 0.2 mm (C, D).
Abbreviations:
aml
= apical metaplical lobe,
apl
= apical proplical lobe,
atp
= antetorsal process.
MANDIBLES. Stipes with apicoventral lobe, no soft pad apically on the lobe. Gnathal lobe not studied with SEM, but apparently no group of small pointed pegs between pectinate lamellae and molar plate on dorsal surface, and no meso-dorsal lobe present between odontomere and sectile edge of psectromere.
GNATHOCHILARIUM (
Fig. 3 E
). Basal edge of median depression of mentum blunt, not overlying main part of mentum, not delimiting a proper cavity. Stipites without setae in basal half.
BODY RINGS (
Fig. 2 B
). Several rows of sigilla; rows sometimes irregular, especially below ozopore level.
LEGS. Length 0.9 × body diameter. First pair with only a few setae on coxosternum, not a large patch as in
P. cerasopus
.
(
Fig. 5 B
).
GONOPODS (
Figs 5 D
,
8
). Proplica club-shaped: base relatively narrow, largest width subapically. Apical lateral lobe (
apl
) with regularly rounded margin continuing in broadly rounded mesapical lobe. Metaplica with mesal margin turning laterad at ca. 70° just before end of proplica, forming a blunt “corner”; apical lobe (
aml
) tongue- or egg-shaped, hardly projecting laterad. Antetorsal process (
atp
) of telopodite (
Fig. 5 D
) projecting obliquely mesodistad, tip just visible between pro- and metaplica (
Figs 8 C, D
).
Females.
Unknown.
Distribution.
Only known from the
type
locality, Mazumbai forest in the
West
Usambara Mountains (
Fig. 9
).