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 Author Means, Jackson C. DFD2FDCA-264D-4CB2-99E7-8C2826EC9370 Virginia Museum of Natural History, 21 Starling Ave., Martinsville, Virginia 24112, USA. jackson.means@vmnh.virginia.gov Author Bouzan, Rodrigo S. 14A15A7F-730F-4D41-BDAC-D53514FAB85D Pós-graduação em Zoologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil. & Laboratório Especial de Coleções Zoológicas, Instituto Butantan, Avenida Vital Brasil, 1500, 05503 - 090, São Paulo, Brazil. rodrigobouzan@ib.usp.br Author Iniesta, Luiz Felipe Moretti DEEF048E-97FB-4CCD-875F-5FA6184CA8AB Laboratório Especial de Coleções Zoológicas, Instituto Butantan, Avenida Vital Brasil, 1500, 05503 - 090, São Paulo, Brazil. luiz-moretti@hotmail.com Author Martínez-Torres, Daniela 3D6A9085-FE64-4647-9A4E-EC1599DD26D4 Grupo de Investigación en Aracnología & Miriapodología (GAM-UN), National University of Colombia, Bogotá, Colombia. sdmartinezt@unal.edu.co Author Vasquez-Valverde, Luisa F. F02C95CA-727E-4170-B81C-A25C9944E700 Department of Entomology, Virginia Tech, 216 A Price Hall, Blacksburg, VA 24061, USA. luisafvv@vt.edu Author Brescovit, Antonio D. 29156EF8-63CA-4499-8CB7-C57C20A9109B Laboratório Especial de Coleções Zoológicas, Instituto Butantan, Avenida Vital Brasil, 1500, 05503 - 090, São Paulo, Brazil. antonio.brescovit@butantan.gov.br Author Ivanov, Kaloyan AD3C06A4-8ECF-40AD-9D17-DCFC8818A5AC Virginia Museum of Natural History, 21 Starling Ave., Martinsville, Virginia 24112, USA. kal.ivanov@vmnh.virginia.gov text European Journal of Taxonomy 2023 2023-07-27 885 1 65 85 http://dx.doi.org/10.5852/ejt.2023.885.2189 journal article 59554 10.5852/ejt.2023.885.2189 f8509ab7-b884-41aa-a5ee-f8c425a46031 2118-9773 8205500 444CE1D2-8098-4CDE-9B97-927CA13FC39F Key to males of Dibolostethus Hoffman, 2009 1. Sternite of 5 th body ring with two pairs of short, blunt projections ( Fig. 3D ); apex of gonopodal prefemoral process with large, tongue-shaped lobe, best seen in anterior view ( Fig. 7B ); Colombia .......................................................... D. kattani Means, Bouzan, Martínez-Torres & Ivanov sp. nov. – Sternite of 5 th body ring without modifications; apex of gonopodal prefemoral process not as above; Ecuador ............................................................................................................................................. 2 2. Projections on sternite of 4 th body ring stout, conical, curving at tip between coxae, appressed along entire length ( Fig. 4C–D ); prefemoral process and solenomere together resembling blacksmithing bolt tongs in lateral and mesal views ( Fig. 6A, C ); body length approximately 30 mm ; color of appendages and body uniform ............................... D. inopinatus Means, Bouzan & Ivanov sp. nov. – Projections on sternite of 4 th body ring thin, blade-like, curving beyond coxae, separated along entire length ( Fig. 4A–B ); prefemoral process enveloping, and partially obscuring solenomere in mesal view ( Fig. 5C ); body length less than 25 mm ; color of appendages lighter and contrasting with that of body ..................................................................................................... D. sicarius Hoffman, 2009 A total of 34 chelodesmid genera have been reported from the Tropical Andes Biodiversity Hotspot ( Table 1 ). These include 24 genera from 9 nine tribes and 10 additional genera currently unassigned to a tribe. Of the 34 genera known from the Tropical Andes, 9 (25%) are monotypic. The most species rich genera in the region include Trichomorpha Silvestri, 1897 (26 spp.), Leptodesmus de Saussure, 1859 (13 spp.), Chondrodesmus Silvestri, 1897 (11 spp.), and Biporodesmus Attems, 1898 , Trachelodesmus Peters, 1865 , and Leiodesmus Silvestri, 1897 (5 spp. each). Conversely, 15 genera are represented in the region by a single species ( Table 1 ). Fig. 8. Dibolostethus sicarius Hoffman, 2009 , paratype, ♀ (VMNH110811), vulvae. A . Left vulva, lateroventral view, with operculum at base. B . Vulvae in situ, held appressed to 2 nd leg pair coxae with valve openings facing each other. C . Left vulva, lateral view. Taxa have been reported from six of the seven (excluding Chile ) countries falling within the boundaries of the Tropical Andes ( Fig. 9 ). The most widespread genus in the region is Leptodesmus , stretching from northwestern Venezuela to northwestern Argentina (> 3800 km ). It is important to note that Hoffman (1971) restricted the genus to only 21 species endemic to Brazil , with the remaining taxa considered incertae sedis, and without assignment at the generic level ( Bouzan et al. 2021 ). 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. Table 1 (continued on next page). Summary of the taxa of Chelodesmidae Cook, 1895 reported from the Tropical Andes Biodiversity Hotspot. Taxa are arranged alphabetically by tribe and genus. The number of species reported from each country is provided parenthetically. See Supp. file 1 for a list of species.
Trib e Genera Tropical Andes Distribution
Batodesmini Alocodesmus Batodesmus Biporodesmus Colombodesmus Cordilleronomus Cormodesmus Heteropeltis Plusioporodesmus Tunochilus Colombia (1), Venezuela (2) Colombia (2) Colombia (2), Ecuador (1), Peru (1) Colombia (2) Ecuador (2) Colombia (1) Colombia (1) Colombia (1) Venezuela (2)
Chondrodesmini Alyssa Chondrodesmus Ecuador (1) Colombia (9), Ecuador (1), Venezuela (1)
Dibolostethini Dibolostethus Colombia (1), Ecuador (1)
Leptodesmini Leptodesmus Argentina (1), Colombia (2), Ecuador (3), Peru (5), Venezuela (2)
Lepturodesmini Camptomorpha Eressea Lepturodesmus Ecuador (2), Peru (1) Venezuela (1) Venezuela (4)
Macrocoxodesmini Eucampesmella Peru (1)
Platinodesmini Platinodesmus Argentina (1)
Trachelodesmini Alassodesmus Colombia (1)
Diarcuaria Hypodesmus Phlyzakium Trachelodesmus Colombia (1) Colombia (1), Venezuela (1) Venezuela (2) Colombia (2), Venezuela (3)
Trichomorphini Trichomorpha Colombia (22), Ecuador (1), Venezuela (3)
Table 1 (continued).
Trib e Genera Tropical Andes Distribution
Not assigned to a tribe Arthromachus Peru (1)
Chondrodesmoides Peru (1)
Desmoleptus Peru (3)
Guayapeltis Ecuador (1)
Incodesmus Peru (1)
Inconus Peru (1)
Leiodesmus Argentina (2), Bolivia (4), Peru (1)
Odontopeltis Argentina (1)
Perudesmus Peru (1)
Peruprion Peru (2)
The number of species and records (in parentheses) from each country are as follows: Colombia – 49 species (61 records); Venezuela – 21 (26); Peru – 19 (27); Ecuador – 13 (13); Argentina – 5 (6); and Bolívia – 4 (4); for a total of 110 species and 137 records (Supp. file 1). A.kmz file of the Chelodesmidae of the Tropical Andes is provided as Supp. file 2.