New Liodessus species from the high Andes of Peru (Coleoptera: Dytiscidae Bidessini) Author Balke, Michael 0000-0002-3773-6586 SNSB-Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247 München, Germany. Author Megna, Yoandri S. 0000-0002-5336-281X Departamento de Biología, Universidad de Oriente. Patricio Lumumba s / n, Santiago, Santiago de Cuba, Cuba. ysmegna @ gmail. com; https: // orcid. org / 0000 - 0002 - 5336 - 281 X ysmegna@gmail.com Author Zenteno, Nilver 0000-0001-8698-3797 Departamento de Entomología, Museo de Historía Natural, Universidad Nacional Mayor de San Marcos, Avenida Arenales 1256, Jesús María 15072, Lima, Perú. & nilverjzenteno @ gmail. com; https: // orcid. org / 0000 - 0001 - 8698 - 3797 nilverjzenteno@gmail.com Author Figueroa, Luis 0000-0002-1404-6195 Departamento de Entomología, Museo de Historía Natural, Universidad Nacional Mayor de San Marcos, Avenida Arenales 1256, Jesús María 15072, Lima, Perú. & luis _ thecell @ hotmail. com; https: // orcid. org / 0000 - 0002 - 1404 - 6195 luis_thecell@hotmail.com Author Hendrich, Lars 0000-0001-8366-0749 SNSB-Zoologische Staatssammlung München, Münchhausenstrasse 21, 81247 München, Germany. & hendrich @ snsb. de; https: // orcid. org / 0000 - 0001 - 8366 - 0749 hendrich@snsb.de text Zootaxa 2020 2020-09-15 4852 2 151 165 journal article 8404 10.11646/zootaxa.4852.2.1 33b954d6-7939-47da-9776-6b079002355a 1175-5326 4519043 2A612C28-2E39-4729-9DDD-27EE6ED90F4E Liodessus thespesios sp. nov. ( Figs 3A, B , 4E , 6A, B , 7 ) Type locality. Peru , Cusco , Calca , Lares District , Abra Lares , 4,353 m , -13.190° -71.940°. Type material. Holotype : Male ( MUSM ): “ Peru : Cusco , Calca, Lares District, Abra Lares, 4353 m , 2.ix.2018 , -13.190° -71.940°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_42)”; “ Holotype Liodessus thespesios sp. nov. Balke, Megna, Hendrich des. 2020” [red printed label]. 420 Paratypes ( MUSM , ZSM ) : 50 exs. : same data as holotype ; 54 exs. : “ Peru : Cusco , Quispicanchi , Marcapata, Yanatturo , 4433 m , 23.viii.2018 , -13.633° -71.151°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_23)” ; 35 exs. : “ Peru : Cusco , Quispicanchi , Marcapata , Yanatturo , 4458 m , 23.viii.2018 , -13.634° -71.143°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_24)” ; 37 exs. : “ Peru : Cusco , Quispicanchi , Pirhuayani , 4662 m , 23.viii.2018 , -13.641° -71.107°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_25)” ; 19 exs. : “ Peru : Cusco , Quispicanchi , Pirhuayani , 4702 m , 23.viii.2018 , -13.641° -71.104°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_26)” ; 35 exs. : “ Peru : Cusco , Calca , Calca District , Chaypa , 4129 m , 2.ix.2018 , -13.202° -71.92°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_ 40)” ; 171 exs. : “ Peru : Cusco , Calca , Calca District , Pitociray , 4315 m , 2.ix.2018 , -13.203° -71.94°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_41)” ; 50 exs. : “ Peru : Cusco , Calca , Lares District , Abra Lares , 4353 m , 2.ix.2018 , -13.19° -71.94°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_42)” ; 19 exs. : “ Peru : Cajamarca , Cajamarca , Lares District , Pampacorral , Mapacocha , 3948 m , 2.ix.2018 , -13.178° -72.004°, Y. S. Megna & N. Zenteno ( PER _YSM_ 2018_43)”. All paratypes are provided with our red printed paratype labels Description of holotype . Habitus with distinct discontinuity between pronotum and elytra (as in Figs 3A, B ). TL: 2.2 mm ; TL-H: 2.0 mm; TW: 1.0 mm. Colouration. Mostly dark dorsally and ventrally (as in Figs 3A, B ). Surface sculpture. Head with faint microreticulation at base and along hind angles of eyes, frons and clypeus more or less smooth and with few fine setiferous punctures; pronotum shiny with sparser and fine setiferous punctation; elytra shiny with dense and coarser setiferous punctation. Structures. Antenna stout. Head without cervical line but few serial punctures instead. Pronotum on each lateral side (or margin) with distinct bead; with distinct and deep basal plicae. Elytron without basal plicae. Metathoracic wings short, about half the length of elytron. Genitalia. Median lobe of aedeagus thick in lateral view, tip with short nose; lateral lobes (parameres) with distal part appearing comparably broad ( Fig. 4E ). Variation. TL: 2.2–2.3 mm ; TL-H: 1.8–2.0 mm; TW: 1.0–1.0 mm. Very few specimens show a short depression at the elytral base in place of the elytral plicae. Additionally, very few specimens show an extremely faint, interrupted occipital line. We assessed the length of the metathoracic wings in 10 specimens , which all had the same short wing length. While these specimens are certainly not able to fly actively, there might be few fully winged individuals that are capable of flight. Female. Dorsal surface dull due to distinct microreticulation ( Fig. 3B ). FIGURE 2. Dorsal habitus of Liodessus alpinus sp. nov. , paratype, male (A), female (B), from Peru: Junín, Junín, Lagoon Estancia Azulmito; L. rhigos sp. nov. , paratype male (C) and female (D), both from Peru: Junín, Junín, Lagoon Huacra. Scale bar = 1 mm. FIGURE 3. Dorsal habitus of Liodessus thespesios sp. nov. , paratype, male (A), female (B), from Peru, Cusco, Calca, Lares District, Abra Lares; L. hauthi sp. nov. , holotype female (C). Scale bar = 1 mm. FIGURE 4. Median lobe of aedeagus in ventral and lateral view, and paramere in lateral view of paratypes of Liodessus acollensis (A); L. andinus (B); L. alpinus sp. nov. (C), L. rhigos sp. nov. (D) and L. thespesios sp. nov. (E). Scale bar = 0.3 mm. BOLD platform. We provided 30 entries in the “COLLI” project, all retrieved in one cluster. Assignment to that cluster was unambiguous, meaning all specimens were correctly assigned to this morphologically delineated species. FIGURE 5. Habitat of: Liodessus acollensis (A), Junín, Juaja, Lagoon Tragadero, 3,459 m, (PER_YSM_2018_03); (B) Junín, La Oroya, Nueva Ciudad Morococha, 4,244 m, (PER_YSM_2018_04); L. alpinus sp. nov. (C), Junín, Junín, Shalacancha, 4,320 m, (PER_YSM_2018_10); L. acollensis and L. rhigos sp. nov. (D), Junín, Junín, Lagoon Huacra, 4,461 m, (PER_YSM_2018_ 13); L. acollensis and L. alpinus sp. nov. (E), Junín, Junín, Lagoon Estancia Azulmito, 4,452 m, (PER_YSM_2018_14); L. acollensis and L. rhigos sp. nov. (F), Junín, Junín, Lagoon Yanamyacu, 4,327 m, (PER_YSM_2018_16). Etymology. From the Greek thespesios (divine, wondrous). The name is a noun standing in apposition. Distribution. High Andes of southeastern Peru ( Fig. 7 ), ca. 3,900 –4,700 m . Habitat. Shallow and exposed puddles, collected with strainer out of mats of vegetation ( Fig. 6A, B ). Other Dytiscidae associated with this species were species of Rhantus Dejean, 1833 and Lancetes Sharp, 1882 , as well as Liodessus acollensis .