A revision of the species of the pseudoscorpion subgenus Chthonius (Ephippiochthonius) (Arachnida, Pseudoscorpiones, Chthoniidae) from Italy and neighbouring areas
Author
Gardini, Giulio
text
Zootaxa
2013
3655
1
1
151
journal article
43531
10.11646/zootaxa.3655.1.1
a6990774-66c7-4586-b14e-354b42d0857b
1175-5326
223358
FC302AA5-49CC-41B0-9A66-23C11AB4EBAE
Chthonius
(E.)
genuensis
Gardini, 1990
(
Figs 85–88
,
291
)
Chthonius
(E.)
genuensis
Gardini 1990: 243
, figs 22–26.
Type
locality:
Italy
, Liguria, Genoa Prov., Genova Sestri Ponente, Grotta del Monte Gazzo 401 Li/GE (44°26ʹ27ʺN 8°51ʹ0 2ʺE).
Distribution.
Italy
: Liguria.
Diagnosis (
Ƥ
).
An anophthalmic hypogean
Chthonius (Ephippiochthonius)
from Ligurian Apennines that differs from other species of the
C. fuscimanus
group in the following combination of characters: movable cheliceral finger with isolated subapical tooth (
di
) proximal with respect to spinneret; pedipalpal hand (in lateral view) without a rounded hump distad of trichobothria
ib-isb
, weakly depressed at level of
ib-isb
; pedipalpal fixed finger with 12 triangular teeth, at level of
est-it
with 4 teeth occupying
0.1 mm
(distance between successive apices
0.025 mm
); distal half of movable chelal finger with 7 triangular teeth, proximal half with thick and weakly undulated marginal lamina; length of chela
0.75 mm
, length of movable chelal finger
0.44 mm
; chela 6.25 times as long as deep; ratio of pedipalpal femur/carapace 1.4.
FIGURES 85–88
.
Chthonius
(E.)
genuensis
Gardini, 1990
, female holotype. 85, anterior margin of carapace; 86, anterolateral portion of carapace; 87, fingers of right chelicera; 88, right chela, lateral view (redrawn after Gardini, 1990).
Type
material examined.
ITALY
—
Liguria: Genoa Prov.—
1 Ƥ (
holotype
), Genoa, Sestri Ponente, Grotta del Monte Gazzo (= Gr. del Rospo) 401 Li/GE,
295 m
a.s.l.,
29.XII.1980
, R. Sciaky, A. Torchia & S. Zoia leg.
Description of adult (
Ƥ; 3
unknown).
Facies weakly troglomorphic. Integument with weak pigmentation. Carapace 1.05 times longer than broad, posteriorly constricted; anterior margin (fig. 85) dentate between median microsetae, without epistome; no eyes or eye-spots (fig. 86); chaetotaxy 4:6:4:2:2(18), macrosetae fine; length of anteromedian macrosetae
0.08 mm
. Chaetotaxy of tergites
I–X 4
:4:4:4:6:6:6:6:6:4. Chaetotaxy of sternites
II–IX 8
:(3)8(3):(2)7(2):8:7:6:6:6. Chelicerae (fig. 87) 2.1 times as long as broad, palm with 6 setae and 2 microsetae laterally; fixed finger with 6 teeth proximally reduced in size and 5 proximal microtubercles; movable finger with 5 teeth (the distal one bicuspid) and 3 proximal microtubercles; subapical isolated tooth (
di
) proximal with respect to the spinneret;
gl
ratio 0.55; spinneret prominent and apically rounded; rallum with 11 blades. Coxal setae: pedipalp 5 (including 2 on manducatory process),
I 3
+ 3 marginal microsetae,
II 4
,
III 5
,
IV 6
; coxa II with 8 coxal spines, coxae III with 3–4 coxal spines; intercoxal tubercle bisetose. Pedipalp: femur 5.9 times as long as broad; chela (fig. 88) 6.25 times as long as deep; hand of chela 2.4 times as long as deep, weakly depressed at level of
ib-isb
; fixed finger with 13 teeth: the first proximal tooth with tip rounded, the others upright, triangular, all with dental canals; base of fixed finger with 8–9 microtubercles; tip of fixed finger with a modified accessory tooth (
td
) on antiaxial face; fixed chelal finger at level of
est-it
with 4 teeth occupying
0.1 mm
(distance between successive apices
0.025 mm
); distal half of movable finger with 8 teeth: the last proximal tooth with tip rounded, the others upright, triangular, all with dental canals; proximal half of movable chelal finger with thick marginal lamina weakly undulated, becoming thinner between
sb
and
b
; coupled sensilla
pc
on a prominent tubercle halfway between
b
and
sb
; trichobothria as in fig. 88,
eb-esb-ist
placed in a straight line; basal apodeme of movable finger strongly sclerotized, rectangular, apically pointed; ratio of movable finger/hand of chela 1.5; ratio of pedipalpal femur/ movable finger 1.2; ratio of pedipalpal femur/carapace 1.4.
Measurements (in mm). Body length 1.16. Carapace 0.38 × 0.36. Chelicerae 0.33 × 0.155, movable finger length 0.17. Pedipalp: femur 0.53 × 0.09; chela 0.75 × 0.12; hand length 0.29; movable finger length 0.44.
Remarks.
Among the species of the
Chthonius fuscimanus
group,
C. genuensis
is related to the epigean
C. nanus
, a widespread species in the same geographical area, from which it differs in many troglomorphic characters.
C. genuensis
is also related to the hypogean
C. zoiai
from eastern Liguria, from which it differs in the position of the isolated subapical tooth (
di
) on the movable cheliceral finger (
di
proximad with respect to spinneret in
C. genuensis
, level with spinneret in
C. zoiai
) and in the smaller size [length of femur 0.53 (Ƥ) mm in
C. genuensis
, 0.65–0.74 (Ƥ) mm in
C. zoiai
; length of chela 0.75 (Ƥ) mm in
C. genuensis
, 0.92–1.07 (Ƥ) mm in
C. zoiai
].