Dibolostethus kattani Means, Bouzan, Martínez-Torres & Ivanov, 2023

Means, Jackson C., Bouzan, Rodrigo S., Iniesta, Luiz Felipe Moretti, Martínez-Torres, Daniela, Vasquez-Valverde, Luisa F., Brescovit, Antonio D. & Ivanov, Kaloyan, 2023, A review of the previously monotypic tribe Dibolostethini (Chelodesmidae: Chelodesminae) with description of two new species and a summary of the Chelodesmidae of the Tropical Andes Biodiversity Hotspot, European Journal of Taxonomy 885 (1), pp. 65-85 : 76-78

Dibolostethus kattani Means, Bouzan, Martínez-Torres & Ivanov sp. nov.

urn:lsid:zoobank.org:act:E4B3174C-2DC2-4584-B664-D0E4FB12D6B7

Figs 1–2 , 3B–D , 7 , 9

Diagnosis

Adults males of D. kattani sp. nov. differ from those of D. sicarius and D. inopinatus sp. nov. based on the presence of two pairs of short, blunt projections on the sternite of the 5 th body ring ( Fig. 3D ), and the following combination of gonopodal characteristics: solenomere curving with distinct ridge at midway point, tip relatively straight ( Fig. 7A, S ); prefemoral process slightly thinner basally, with shelf under linear lobe just before apex ( Figs 7A, C , PfP); apex with large, tongue-shaped lobe, best seen in anterior view ( Fig. 7B ).

Etymology

The species is named in honor of one of its first collectors, the late Dr Gustavo Kattan. Throughout his career, Dr Kattan collected myriapod specimens across Colombia and donated them to the Instituto de Ciencias Naturales. Noun in the genitive case.

Type material

Holotype COLOMBIA • ♂; Valle del Cauca, Cali, 15 km vía Cali-Buenaventura ; [3.496° N, 76.613° W]; 10 Dec. 1990; C. Murcia and G. Kattan leg.; under leaf litter in tropical forest; ICN-MD-1317 A.

Paratypes COLOMBIA • 2 ♂♂; same collection data as for holotype; ICN-MD-1317B .

Other material

COLOMBIA • 1 ♂; Valle del Cauca, Cali, 16 km vía Cali-Buenaventura ; [3.493° N, 76.613° W]; 1800 m a.s.l.; 11 Oct. 1979; C. Murcia and G. Kattan leg.; under log in tropical forest; ICN-MD-1219 • 1 ♂; Valle del Cauca, Cali, 18 km vía Cali-Buenaventura ; [3.517° N, 76.621° W]; 1900 m a.s.l.; 10 Nov. 2014; D. Martinez leg.; collected at night at the edge of a road; ICN-MD-1367 .

Description

Male (holotype, ICN-MD-1317A)

With characteristics typical for the genus. Coloration (recently preserved in 70% ethanol): body rings dark, reddish brown (nearly purple); head light brown; legs yellowish ocher; telson reddish, with posterior margin (= spinnerets region) yellowish ( Fig. 1 ). Antennae broken. Head: epicranial macrosetae 2–2, interantennal macrosetae 1–1, frontal macrosetae 2–2. Sternites: 4 th body ring with two robust, conical, blunt projections, separated along entire length ( Fig. 2B ); 5 th body ring with two pairs of short, blunt projections, the anterior pair more conspicuous ( Fig. 3D ). Gonopod aperture on 7 th body ring oval, rim notably projecting above sternite (0.67 mm), with a deep U-shaped concavity (0.3 mm) on posterior margin.

GONOPODS ( Fig. 7 ). Gonocoxae rounded, equivalent to about half the length of the telopodite; not prominent in ectal view, with two macrosetae on dorsum. Cannula hook-shaped, broken in the holotype. Solenomere long, slender, unbranched, curving with distinct ridge at midway point, falciform at apex, tip straight ( Fig. 7 , S). Prefemoral process: thin at base, with shelf ( Fig. 7A , Sh) under linear lobe just before apex ( Fig. 7A , Lb); apex with large, tongue-shaped lobe, best seen in anterior view ( Fig. 7B , PfP). BODY MEASUREMENTS (mm). Total length 29.33, total width 2.10. Collum: length 0.77, width 1.55. Podomere length of 10 th body ring (1–7): 0.29, 0.56, 1.15, 0.52, 0.66, 1.05, 0.11. Gonopod aperture: length 0.50, width 0.86. Gonopod: length 1.21, width 0.96. Gonocoxae: length 0.54, width 0.59. Telopodite: length 1.19, width 0.42. Telson length 0.98.

Female

Unknown.

Distribution

Only known from the Valle del Cauca Department, Colombia ( Fig. 9 ).

Figures

Fig. 1. Dibolostethus kattani Means, Bouzan, Martínez-Torres & Ivanov sp. nov., ♂ (ICN-MD-1367), habitus. Scale bar = 5 mm.

Fig. 2. Scanning electron microscope images of Dibolostethus Hoffman, 2009 showing somatic characters. Dibolostethus kattani Means, Bouzan, Martínez-Torres & Ivanov sp. nov., paratype, ♂ (ICN- MD-1317B). A. Body rings 9th and 10th, red rectangle = median metazonal sulcus. B. Venter of 4th body ring, showing paired sternal projections, red oval = stigma. C. Venter of head, showing narrow gnathochilarium. D. Tip of seventh antennomere, red arrow = narrow slit connecting pocket containing sensilla basiconica and sensory cone area.

Fig. 3. Dibolostethus Hoffman, 2009 somatic characters continued. A, E. Dibolostethus sicarius Hoffman, 2009, holotype, ♂ (VMNH110810). B–D. D. kattani Means, Bouzan, Martínez-Torres & Ivanov sp. nov., holotype, ♂ (ICN-MD-1317-1). A. Coxa 2, mesal view, red arrow = gonopore. B. Left leg 4, posterior view, red arrow = tibial ventro-apical projection. C. Left leg of 5th leg pair showing incrassate femur, red arrow = tibial ventro-apical projection. D. Body ring 5, lateral view, red circle = anterior pair of sternal projections. E. Prefemur 5, red arrow = basal pore. Abbreviations: Cx = coxa; Pf = prefemur.

Fig. 7. Dibolostethus kattani Means, Bouzan, Martínez-Torres & Ivanov sp. nov., holotype, ♂ (ICN- MD-1317A), right gonopod. A. Mesal view. B. Anterior view. C. Lateral view. Red circles = cingulum. Dashed lines = prostatic groove. Abbreviations: Lb = lobe; PfP = prefemoral process; S = solenomere; Sh = shelf.

Fig. 9. Distribution of Chelodesmidae spp. in the Tropical Andes Biodiversity Hotspot, by country. Note: the type locality of Dibolostethus sicarius Hoffman, 2009 is included for completeness although it falls just outside of the boundaries of the Tropical Andes Biodiversity Hotspot. For information on these taxa see Supp. file 1.