Chonodesmus alatus ( Peters, 1865 )

Reyes-Peñata, Liseth Alejandra, Romero-Rincon, Juan, Martínez-Torres, Daniela & García-Sarmiento, Martha J., 2025, Two new species of the flat-backed millipede genus Chonodesmus Cook, 1896 (Polydesmida, Cryptodesmidae, Cryptodesmini) from Colombia with a redescription of the type species, Zootaxa 5659 (2), pp. 223-239 : 225

Chonodesmus alatus ( Peters, 1865)

Figs 1 , 2 , 10

Polydesmus (Cryptodesmus) alatus Peters, 1865: 621 (original description, based on three specimens).

Cryptodesmus alatus : Attems, 1899: 266; Carl, 1914: 958, figs 246–247; Attems, 1940: 212, fig. 297.

Chonodesmus alatus : Cook, 1896: 23; Cook, 1911: 468, figs 7–10 (with the first line drawings of some morphological structures); Carl, 1914 (with the first illustration of the gonopods of C. alatus ); Moritz & Fischer, 1978: 132 (information on type material of three specimens, mistakenly referred to as one male and two females syntypes of Polydesmus (Cryptodesmus) alatus (ZMB 305)); Moritz & Fischer, 1978: 136 (erroneous information referring to a female from the type series of Polydesmus (Cryptodesmus) alatus as holotype of Stictodesmus creper (ZMB 13169)); Moritz & Fischer, 1978: 147 (erroneous information referring to another female from type series of Polydesmus (Cryptodesmus) alatus as type of Chonodesmus regularis ).

Diagnosis. Based on gonopodal characteristics, this species appears to be particularly similar to C. muisca sp. nov., but it differs from congeners by the presence of two branches on the posterior lamellar process: first branch elongate and falcate, directed laterally, vs the second branch about half the length of the first.

Material examined

Lectotype (designated herein). COLOMBIA ● ♂; Bogotá, D.C.; (4.609791, -74.081744); 2582 m a.s.l.; dry and pinned; Linding leg.; (ZMB-305).

Additional material examined. ● ♂; Tena , Cundinamarca (Tambo); (4.654936, -74.389989); 1343 m a.s.l; dry and pinned; Fuhrmann leg.; (MHNG-ARTO-28917) .

Figures

FIGURE 1. Chonodesmus alatus (Peters, 1865) male lectotype (ZMB-305). A. Habitus in dorsal view. B, G. Habitus and labels. C. Anterior part of the body in ventral view. D. Detail of collum in dorsal view. E. Gonopods in ventral view. F. Detail of left paranotum of ring 9 in dorsal view. H. Drawings of gonopods by Carl (1914). Scale bars: A= 1 mm; C–D, E= 0.25 mm, F= 0.5 mm.

FIGURE 2. Chonodesmus alatus (Peters, 1865) (MHNG-ARTO-28917). A. Habitus in dorsal view. B. Habitus in ventral view. C, E. Left gonopod in mesal view. D, F. Left gonopod in lateral view. G. Labels. Abbreviations: ca: cannula, Cx: gonocoxae, hm: hyaline membrane, Pfe: prefemoral region, S: solenomere. Scale bar: 0.25 mm.

FIGURE 10. Distribution map of Chonodesmus Cook, 1896.