The millipede genus Iulidesmus Silvestri, 1895 in Colombia (Polydesmida, Paradoxosomatidae, Catharosomatini)
Author
Romero-Rincon, Juan
Museo de Historia Natural, Universidad Pedagógica Nacional, Bogotá, Colombia
Author
Golovatch, Sergei I.
text
Zootaxa
2024
2024-02-20
5415
1
56
76
http://dx.doi.org/10.11646/zootaxa.5415.1.2
journal article
10.11646/zootaxa.5415.1.2
1175-5326
10692554
1BE7AB08-4401-421A-B304-9552378B3C03
Iulidesmus icni
new species
Figs 10
,
11
,
14
urn:lsid:zoobank.org:act:
912E6395-A598-4175-8ACF-4AE73DF7A230
Diagnosis.
The new species seems to be particularly similar to
I. femoralis
(
Schubart, 1943
)
, from
Mato Grosso state
,
Brazil
, and
I. hylaeicus
(
Jeekel, 1963
)
, from
Amapá
and Pará states, floodplain woodlands near Manaus,
Brazil
, and
Guyana
(
Hoffman 1966
;
Adis 1992
), but it differs from the two by both coloration and size being variable, and the solenophore (
sph
) broadened laterally near its apical part.
FIGURE 10.
Iulidesmus icni
n. sp.
, male paratype (ICN-MD-165).
A.
Habitus in dorsal view.
B.
Habitus in ventral view.
Scale bar
: 4 mm.
Name.
In honor of the ICN, Instituto de Ciencias Naturales, the most important collection of myriapods in the country, which houses
type
material of several new species described here.
Material examined.
Holotype
.
COLOMBIA
● ♁;
Guaviare
,
San José
del
Guaviare
,
Playa Güio
,
Puentes
and
Iracas
trails (
2°34′N
,
72°42′W
),
200 m
asl
;
19 March 2014
;
E. Flórez
and
Animal Taxonomy
students’ leg., manual sorting of litter,
Winkler
extraction; (ICN-MD-2916).
Paratypes
.
● 3 ♁♁,
3♀♀
; same data as holotype; (ICN-MD-970). ● 1
♁,
1 ♀
and
4 juveniles
;
Guaviare, San José
del
Guaviare
,
Playa Güio
;
9 October 2013
;
E. Flórez
and
Animal Taxonomy
students’ leg.; (ICN-MD-668). ● 1 ♁;
Boyacá
,
Santa María
W of Mambita
;
14 May 2009
;
R. Romero
leg.; (ICN-MD-165). ● 1 ♁;
Meta
,
Acacías
(
3°52′56′′N
,
73°35′11′′W
),
348 m
asl
;
21 November 2008
;
J. Fernández
and
L. Bermúdez
leg.
pitfall
trapping; (MHN- UPN-MD-209). ● 1 ♁;
Amazonas
, Parque Nacional Natural Amacayacu, road to
San Martín
(
3°41′N
,
70°15′W
),
80–200 m
asl
;
13–14 June 1992
;
R. Torres-Nuñez
leg.; (MHN-UPN-MD-214)
.
Description.
Length and width of midbody metazoan:
holotype
(male),
20.5 mm
,
2.2 mm
, and
paratype
(female ICN-MD 668),
20 mm
,
2.4 mm
, respectively. Coloration in alcohol variable, from greyish red 19 to reddish black 24 with moderate brown 58 to light orange yellow
70 in
pleurosternal areas. Antennae vivid orange 48, tip of antenna entirely pallid, legs light orange yellow 70.
FIGURE 11.
Left gonopod of
Iulidesmus icni
n. sp.
, male holotype (ICN-MD-2916).
A, D.
Mesal view.
B, E.
Ventral view.
C, F.
Lateral view.
Abbreviations
:
ca:
cannula,
cx:
coxite,
fe:
femorite,
ll:
lamina lateralis,
lm:
lamina medialis,
lo:
apical lobe,
pfe:
prefemorite,
sl:
solenomere,
sph:
solenophore,
su1:
distofemoral sulcus,
su2:
postfemoral sulcus.
Scale bar
: 0.5 mm.
Body strongylosomoid, not moniliform, with poorly developed paraterga (
Fig. 10
). Postcollar constriction evident; in width, ring 3 = 4 <head <2 <collum <5 – 17; on rings 18 – 20, trunk tapering towards telson. Antennae long, claviform,
in situ
reaching the middle of ring 5 (
Fig. 10
); in length, antennomeres 2>4>5>6>3>1>7.
Paraterga set low (at about half midbody height), considerably larger on pore-bearing rings than on poreless ones, never projecting caudally past rear tergal margin, flattened and decreasing in size only from ring 18 towards telson. Transverse mid-dorsal sulci present on rings 2–18, faint, thin lines not reaching the bases of paraterga. Ozopores lateral, slightly visible from above, located inside round to ovoid grooves, lying on paraterga at ca 1/3 metazonital length off caudal edge. Tegument generally smooth, 2+2 long setae (each ca
0.22 mm
long) or their insertion points anteriorly in one transverse row on each postcollar metatergum.
Sterna with evident transverse cross-impressions, densely setose, traceable sternal cones (males) very small and densely setose between coxae 4–7 (
Fig. 10B
). Legs long (ca 1.15 times longer than midbody height), tarsal brushes present on all legs, but less evident in ring 18, coxae and prefemora each with a conspicuous long seta ventro-apically. Femora without adenostyles. In length, femur> postfemur> tarsus> tibia> postfemur.
Gonopod (
Fig. 11
) relatively simple. Coxite (
cx
) subcylindrical, without faint, ventral, subtransverse ridge at midway, not elongate, setose ventrally; cannula (
ca
) normal, tubiform. Prefemorite (
pfe
) shorter than femorite (
fe
), densely setose;
fe
demarcated clearly basally, also distally by a distofemoral sulcus (
su1
).
sph
directed medially, large, long and flattened, without apical processes, subcircular; apical lobe (
lo
) very short, clearly delimited by
su1
and very clearly by
su2
. Solenomere (
sl
) sheathed between lamina medialis (
lm
) and lamina lateralis (
ll
),
lm
shorter and smaller than
ll
;
su2
marking the beginning of a flagelliform
sl
inside
lm
.
Remarks.
The new species clearly falls into group V, subgroup 3a of
Jeekel (1963)
, together with
I. derelictus
(
Silvestri, 1895
)
, from Missiones Mosetenes,
Argentina
,
I. femoralis
(
Schubart, 1943
)
and
I,
hylaeicus
(
Jeekel, 1963
)
sharing the gonopod solenophore (
sph
) being curved to form an almost complete circle; femorite (
fe
) expanded medially, and the
sph
apical part truncate. However,
I. icni
n. sp
.
differs from the former species by the
sph
apical part being slightly oblique, and the apical lobe (
lo)
more strongly pronounced; from
I. femoralis
and
I. hylaeicus
by the absence of adenostyles in male legs 4–7; and from
I. hylaeicus
also by no evidence of a small notch or incision in the apical part of the
sph
.
Furthermore, this new species is particular in strongly variable sizes and colorations, this obviously correlating with a rather vast distribution and a large material. For example, in length the
paratype
male from
Boyacá
(ICN-MD 165) is
7 mm
less than the
holotype
from
San José
del Gauviare:
17.8 mm
, and the width of midbody metazona is
1.7 mm
.
Distribution.
Known from
San José
del
Guaviare
,
Guaviare
, Santa Maria West of Mámbita,
Boyacá
, Acacías,
Meta
and P.N.N. Amacayacu,
Amazonas
(
Fig. 14
).