Iulidesmus icni Romero-Rincon & Golovatch 2024, new species
Creators: name: Romero-Rincon, Juan
name: Golovatch, Sergei I.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplopoda
Polydesmida
Paradoxosomatidae
Iulidesmus
Iulidesmus icni

description: 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.
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.
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).
description: Published as part of Romero-Rincon, Juan & Golovatch, Sergei I., 2024, The millipede genus Iulidesmus Silvestri, 1895 in Colombia (Polydesmida, Paradoxosomatidae, Catharosomatini), pp. 56-76 in Zootaxa 5415 (1) on pages 68-70, DOI: 10.11646/zootaxa.5415.1.2, http://zenodo.org/record/10692554