Liodessus acollensis Guignot, 1955

Balke, Michael, Megna, Yoandri S., Zenteno, Nilver, Figueroa, Luis & Hendrich, Lars, 2020, New Liodessus species from the high Andes of Peru (Coleoptera: Dytiscidae Bidessini), Zootaxa 4852 (2), pp. 151-165 : 152-153

Liodessus acollensis Guignot, 1955

( Figs 1 A–C, 4A, 5A, B, D, E, 7)

Liodessus acollensis Guignot, 1955: 272 (original description); Nilsson & Hajek 2020: 120 (world catalogue).

Type locality. Peru, Junín, Acolla near Jauja , 3,460 m , -11.743° -75.549°.

Type material. 1 Paratype female in coll. Guignot ( MNHN) Perou, Acolla près, Jauja, 3460 m, III-1955 / ♀ / Paratypes. ( According to Guignot, 1955, collected in “ I-1954 ”, by F. Blancas) .

Other material studied (526 exs.). 5 exs.: “ Peru: Junín, Jauja, Lagoon Tragadero , 3459 m, 04.viii.2018, - 11.767° -75.532°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_03)” ; 28 exs.: “ Peru: Junín, La Oroya, Nueva Ciudad Morococha, 4244 m, 06.viii.2018, -11.579° -76.07°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_04)” ; 165 exs.: “ Peru: Junín, Junín, Lagoon Huacra , 4461 m, 14.viii.2018, -11.289° -76.007°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_13)” ; 7 exs.: “ Peru: Junín, Junín, Lagoon Estancia Azulmito , 4452 m, 14.viii.2018, -11.303° - 76.989°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_14)” ; 1 ex.: “ Peru: Junín, Junín, Lagoon Yanamyacu , 4327 m, 14.viii.2018 ,, -11.314° -75.956°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_16)” ; 25 exs.: “ Peru: Junín, Junín, Shoqui , 4324 m, 15.viii.2018, -11.046° -75.897°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_18)” ; 5 exs.: “ Peru: Junín, Junín, Shoqui , 4330 m, 15.viii.2018, -11.049° -75.9°, Y. S. Megna & N. Zenteno ( PER _YSM_ 2018_19)” ; 1 ex.: “ Peru: Junín, Jauja, Lagoon Vinso, Patacancha , 3911 m, 15.viii.2018, -11.921° -75.505°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_20)” ; 37 exs.: “ Peru: Cusco, Quispicanchi, Marcapata, Yanatturo , 4458 m, 23.viii.2018, -13.634° -71.143°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_24)” ; 11 exs.: “ Peru: Cusco, Canchis, Checacupe, Cayena , 4613 m, 25.viii.2018, 14.027° -71.114°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_29)” ; 21 exs.: “ Peru: Cusco, Canas, Layo District , 4122 m, 26.viii.2018, -14.507° -71.064°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_30)” ; 62 exs.: “ Peru: Cusco, Canas, Langui District, 32. Road 34 G, 3960 m, 26.viii.2018, - 14.434° -71.279°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_31)” ; 70 exs.: “ Peru: Cusco, Acomayo, Acopia District, Lagoon Pomacanchi , 3675 m, 27.viii.2018, -14.039° -71.496°, Y. S. Megna & N. Zenteno ( PER _YSM_ 2018_33)” ; 18 exs.: “ Peru: Cusco, Acomayo, Acopia District, Lagoon P′osqoqocha, 3846 m, 27.viii.2018, -14.085° -71.481°, Y. S. Megna & N. Zenteno ( PER _YSM_2018_34)” .

Notes. This is a moderately large, oval species with yellowish to brownish dorsal surface; the pronotum is generally rather dark in the middle with paler sides ( Figs 1 A–C). Head with cervical line that can be faint in some specimens; pronotum with basal plicae; elytron with short basal plicae. TL 2.1–2.2 mm, TL-H 1.8–1.9 mm; TW 1.0– 1.1 mm. Male genitalia as in Fig. 4B , median lobe in lateral view with apical portion thin, paramere with apical piece moderately long and narrow. Dorsal surface of male shiny, female dull due to fine mircoreticulation. Metathoracic wings fully developed.

BOLD platform. We provided 45 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.

Distribution. High Andes, central and southeastern Peru and Lake Titicaca of Bolivia ( Fig. 7 ), ca. 3,400 –4,600 m.

Habitat. Shallow and exposed puddles, collected with strainer out of mats of vegetation ( Figs 5A, B, D, E, F ; 6C ). Other Dytiscidae associated with this species were species of Rhantus Dejean, 1833 and Lancetes Sharp, 1882 , as well as Liodessus alpinus sp. nov., L. rhigos sp. nov. and L. thespesios sp. nov.

Figures

FIGURE 1. Dorsal habitus of Liodessus acollensis, male (A), female (B), light colored female (C), from Peru, Junín, Acolla near Jauja; L. andinus, male (D) and female (E), both from Cusco, Acomayo, Acopia District, Peru. 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.

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).

FIGURE 6. Habitat of: Liodessus thespesios sp. nov. (A, B), Cusco, Quispicanchi, Pirhuayani, 4,662 m (PER_YSM_2018_ 25); L. acollensis (C), Cusco, Acomayo, Acopia District, Lagoon Pomacanchi, 3,675 m, (PER_YSM_2018_33); L. andinus (D), Cusco, Acomayo, Acopia District, Lagoon Misk′iqocha, 3,787 m, (PER_YSM_2018_35); L. andinus (E, F), Cusco, Canchis, San Pedro District, 3,486 m (PER_YSM_2018_36).

FIGURE 7. Distribution map of Liodessus species treated in this publication.