Liodessus bogotensis sumapaz, Balke & Neven & Villastrigo & Ospina-Torres & Prieto & Gutierrez Rubiano & Lotta & Dueñas & Hendrich, 2023

Balke, Michael, Neven, Katja, Villastrigo, Adrian, Ospina-Torres, Rodulfo, Prieto, Carlos, Gutierrez Rubiano, Nicolas, Lotta, Ingrid, Duenas, Luisa F. & Hendrich, Lars, 2023, Eastern Colombian Paramo Liodessus Guignot, 1939 diving beetles are genetically structured, but show signs of hybridization, with description of new species and subspecies (Coleoptera, Dytiscidae), ZooKeys 1143, pp. 165-187 : 165

Liodessus bogotensis sumapaz ssp. nov.

Figs 7B , 9C , 10F

Type locality.

Colombia, Bogotá D.C., Páramo de Sumapaz.

Holotype: Colombia • ♂; Bogotá D.C., PN Sumapaz; 3,500 m alt.; 13.xi.2018, 4.290, -74.207; Ospina, Balke & Megna leg.; COL_MB_2018_04; UNAL. Paratypes: Colombia • 409 specimens; same data as holotype; UNAL, ZSM. ZSM specimen imaging number for holotype: ZSM-COL-00096.

Description of holotype.

A larger representative of the genus. Habitus narrowly elongate-oval, with slight discontinuity between pronotum and elytra (Fig. 7B ); pronotum widest before base (Fig. 7B ). Total length 2.5 mm; length without head 2.1 mm; maximum width 1.1 mm.

Color. Very dark brown to blackish dorsally and ventrally; lighter on anterior head, lateral pronotum, and bases of meso- and metatibia; elytron with slightly paler, band-like markings obvious under dissecting scope (Fig. 7B ).

Surface sculpture. Head with a few setiferous punctures in front of a faint occipital line; distinct microreticulation only present around the eyes (Fig. 7B ); posterior to occipital line with distinct microreticulation and few punctures. Pronotum and elytron shiny, with moderately dense, coarse, setiferous punctation (Fig. 7B ).

Structures. Head with a rather faint occipital line in which there is series of punctures, with rounded clypeus. Antenna stout. Pronotum with distinct lateral bead and distinct, long, deep basal striae (Fig. 7B ).

Genitalia. Median lobe of aedeagus typical of the L. bogotensis complex, with slight variation in curvature among individuals; tip in ventral view subtly broader than in the other subspecies of the complex (Figs 9C , 10F ); parameres simple, of the " Bidessini " type, 2-segmented.

Variation.

Measurements (N = 20). Total length 2.4-2.6 mm (mean 2.53); length without head 2.1-2.3 mm (mean 2.19); maximum width 1.0-1.2 mm (mean 1.1).

Occipital line. Faint but well visible, or more or less obsolete (a few punctures visible instead).

Color. Usually darkly colored but a few specimens with paler, band-like markings on elytra.

Female variation: see below.

Metathoracic wings. Short, 2/3 or elytral length, venation visible in five dissected specimens from COL_MB_2018_10.

Female. External morphology as in male, with the dorsal surface shiny except for microreticulation on the head; dorsal sculpture varies, with microreticulation on the posterior ~1/3 of elytron so that the surface appears slightly less shiny, or entire dorsal surface with stronger, dense microreticulation so that the surface appears dull (e.g. Fig. 7B , second specimen from right).

Etymology.

Named after the type locality, Páramo de Sumapaz. The word “sumapaz” is a noun in the nominative singular standing in apposition.

Identification notes.

This subspecies is reliably only identified on the basis of the collecting locality and Cox1 data. In the COLLI sequence database this subspecies has two diagnostic characters different from the other subspecies (Table 1 ).

Distribution.

Only known from the Páramo de Sumapaz (Fig. 1 ).

Habitat.

Exposed, shallow, densely vegetated, stagnant water bodies.

Figures

Figure 1. Map of sampling localities A overview of northwestern South America showing are of sampling depicted in " B " B colored areas represent districts in Paramo: Santanderes (blue), Boyaca (green), and Cundinamarca (brown).

Figure 7. Variation in size and dorsal coloration of subspecies of Liodessus bogotensis A Liodessus b. lacunaviridis B Liodessus b. sumapaz. Scale bar: 2 mm.

Figure 9. Median lobes in lateral view of Liodessus subspecies A L. bogotensis lacunaviridis B L. b. matarredonda C L. b. sumapaz. Scale bar: 0.2 mm.

Figure 10. Tips of median lobes in ventral view of Liodessus subspecies A L. bogotensis bogotensis B L. bogotensis almorzadero C L. bogotensis chingaza D L. b. lacunaviridis E L. b. matarredonda F L. b. sumapaz. Scale bar: 0.1 mm.