Hydaticus lateralis Laporte, 1835

Megna, Yoandri S., Balke, Michael, Apenborn, Rico & Hendrich, Lars, 2019, A review of Peruvian diving beetles of the genus Hydaticus Leach, 1817, with description of Hydaticus (Prodaticus) panguana sp. nov. and notes on other Neotropical species (Coleoptera: Dytiscidae), Zootaxa 4615 (1), pp. 113-130 : 116-117

Hydaticus lateralis Laporte, 1835

( Figs 2B , 5 , 8, 9A, 9B )

Hydaticus lateralis Laporte, 1835: 97 ; Aubé 1838: 189; Sharp 1882a: 780; Branden 1885: 101; Zimmermann 1920a: 221; Blackwelder 1944: 79; Trémouilles 1996: 28; Benetti & Hamada 2003: 704; Nilsson & Hájek 2019: 94.

Hydaticus amazonicus Sharp 1882a: 655 ; Sharp 1887: 758; Branden 1885: 103; synonymy by Trémouilles 1996: 28.

Type locality. French Guiana, Cayenne .

Material examined. VENEZUELA: “ Venezuela, Caripito , 4.V. & 9.VIII.1942, New York Zoo. Soc. Dept. Tropical Research”, 2 exs., ( CGW, AMNH) . GUYANA: “ Guyana, Bartica , New York Zoo. Soc. Dept. Tropical Research”, 1 ex., ( AMNH) . SURINAME: “ Surinam, Tafelberg Distr., Saramacca Camp 2, 13 km NW of air strip, 20.VI.1979, leg. M.S. Hoogmoed ”, 1 ex., ( CGW) . PERU: “ Peru, Huánuco Department, Yuyapichis , Stat. Panguana , 20.9.- 7.10.2013, - 9.616667S, - 74.9333W, Bäche, Burmeister leg.”, 1 ex., ( ZSM) ; “ Peru / Amazonia Prov. Huánuco Río Yuyapichis , Panguana , VII.1982 Palmensumpf leg. E.G. Burmeister”, 1 ex., ( ZSM) ; “ Peru, Dept. Huánuco Panguana ACP, Río Yuyapichis , 230m, 9°37ʹS 74°56ʹW, 28.09.- 06.10.2000, leg. E.G. Burmeister ”, 3 exs., ( MUSM, ZSM) ; “ Peru, Huánuco Department, Panguana , Yuyapichis river , 25.vii.2013, - 9.616667S, - 74.9333W, R. Apenborn leg.”, 7 exs., ( MUSM, ZSM) .

Diagnosis. TL = 12.9–13.8 mm; TL-H = 12.2–13.1 mm; MW = 6.8–7.2 mm; pronotum black with lateral margins testaceous; elytron with basal fasciae not confluent with sublateral, longitudinal and yellowish stripes; elytron with sublateral stripes extended to the mid length of elytra, with a subtriangular, postmedial and broad spot ( Fig. 2B ); protarsomere I with a series of spines across the dorsal surface; metatibia with bifid setae curved ventro-basally on posterior surface; median lobe of aedeagus with apex rounded in lateral view ( Fig. 5 ).

Differential diagnosis. Hydaticus lateralis has the colour pattern of the pronotum and the elytra similar to H. devexus and H. tuyuensis , but can be distinguished from those species by the following combination of characters: elytron with transverse and subbasal yellowish fasciae, often with sublateral, longitudinal and yellowish stripe; elytron with basal and sublateral yellowish stripes not connected, and with a postmedial and broad spot.

Distribution. Prior to this study, Hydaticus lateralis had been recorded from Brazil and French Guiana only (Laporte 1835; Trémouilles 1996). Its range of distribution is now extended to Guyana, Venezuela, Suriname, and Peru ( Fig. 8).

Ecology. Trémouilles (1996) and Benetti & Hamada (2003) reported this species from lowland areas in Brazil. In Panguana, H. lateralis was collected in shaded and shallow rest pools of forest streams and temporary forest pools, packed with decaying leaves and wood ( Fig. 9A, 9B ). Hydaticus lateralis is sympatric and sometimes syntopic with H. panguana sp. nov. and H. subfasciatus . The species is also attracted to light.

Figures

FIGURE 2. Dorsal habitus of H. panguana sp. nov. (A), H. lateralis (B), H. subfasciatus (C) and H. xanthomelas (D). All specimens collected in Panguana, Peru. Scale bar = 5 mm.

FIGURE 9. Habitats of H. panguana sp. nov. and H. lateralis (A), and H. subfasciatus and H. lateralis (B) in Panguana, Huànuco, Peru. Shallow and temporary forest pool with rotten leaves and wooden debris (A), and Aguajal forest pond (B).

FIGURES 4–7. Median lobe of aedeagus in dorsal (A) and lateral view (B): H. panguana sp. nov. (4), H. lateralis (5), H. subfasciatus (6), and H. xanthomelas (7). Scale bar = 1 mm.