Hydaticus subfasciatus 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 : 117-118

Hydaticus subfasciatus Laporte, 1835

( Figs 2C , 6 , 8, 9B )

Hydaticus subfasciatus Laporte, 1835: 96 ; Aubé 1838: 186; Gemminger & Harold 1868: 467; Sharp 1882a: 665; Sharp 1882b: 43; van den Branden 1885: 103; Régimbart 1904: 225; Zimmermann 1920a: 226; Zimmermann 1920b: 229; Zimmermann 1924: 3; Blackwelder 1944: 79; Roughley & Pengelly 1981: 271; Trémouilles 1996: 20; Peck 2006: 176; Ferreira (Jr.) & Braga 2009: 324; Short & Kadosoe 2011: 87; Short 2013: 85; Bergsten & Miller 2014: 73; Hendrich et al. 2016: 72; Nilsson & Hájek 2019: 96.

Type locality. French Guiana, Cayenne .

Material examined. COSTA RICA: “ Costa Rica, Limón, Refugio Nacional Gandoca-Manzanillo , 10-13-ii- 2018, 09°37′49′′N, 82°40′24′′W, ca. 20 m, E. Holzer leg.”, 1 ex., ( NMW) . VENEZUELA: “ Venezuela, Rancho Grande nr. Maracay , 28.IV.1942, New York Zoo. Soc. Dept. Tropical Research”, 1 ex., ( AMNH) . GUYANA: “ Guyana, Bartica Distr., Kartabo , 13.V.1942, New York Zoo. Soc. Dept. Tropical Research”, 2 exs., ( AMNH) . BOLIVIA: “ Bolivia, Prov. Sara, Waldbachpfütze , 400 m, II.1906, leg. Steinbach ”, 1 ex., ( CGW) ; “ Bolivia , Beni, 16.ii.1991 ”, 1 ex., ( ZSM) . COLOMBIA: “ Colombia, Putumayo, Puerto Asis , 4-27.vii.1996, ca. 300 m, R. Rietmaier ”, 2 exs., ( ZSM) . SURINAME: “ Suriname, Kraka, Phedra road, 25.x.1962, B. Malkin leg.”, 7 exs., ( ZSM) ; “ Suriname, Colakreek, 10 km from Zanderij , 18.xi.1962, B. Malkin leg.”, 5 exs.; “Suriname, Sammlung A. Zimmermann ”, 6 exs. ( ZSM) ; “ Suriname, Saramacca, 1st Trib. of Troolikreek System , 28.x.1969, 55°20ʹW; 05°24ʹN, N. Niesser leg.”, 6 exs., ( NMW) ; “ Suriname , Marowijne, 2-xii-1969, 54°06ʹW; 05°30ʹN, N. Niesser leg.”, 1 ex., ( NMW) ; “ Suriname, Zanderij , savanne, 15-ix-1969, 55°14ʹW; 05°27ʹN, N. Niesser leg.”, 2 exs, ( NMW) ; “ Surinam, Zanderijsavanne, 1st trib. Of Colacreek , ca. 05°27ʹN 55°14ʹW, 15.IX.1969, leg. N. Nieser ”, 4 exs., ( CGW) ; “ Surinam, Near Paranaribo, Wasserloch , 1908, leg. C. Heller,” 2 exs, ( CGW) . PERU: “ Peru, Huánuco Department, Yuyapichis , Stat. Panguana , 9.10.2010, - 9.616667S, - 74.9333W, Burmeister leg.”, 2 exs., ( ZSM) ; “ Peru, Huánuco Department, Yuyapichis , Stat. Panguana , 20.9.- 7.10.2013, - 9.616667S, - 74.9333W, Bäche, Burmeister leg.”, 2 exs., ( ZSM) ; “ Peru, Huánuco Department, Yuyapichis , Stat. Panguana , 20.9.- 9.10.2007, - 9.616667S, - 74.9333W, Bäche, Resttümpel, Burmeister leg.”, 1 ex., ( ZSM) ; “PERU, Dept. Huánuco Panguana Malaise Trap, Río Yuyapichis , 260m, 9°37ʹS 74°56ʹW, E. Diller leg., 20.9.- 15.10.2011 ”, 1 ex., ( ZSM) ; “ Peru, Dept. Huánuco ACP Panguana , Río Yuyapichis , - 9.616667S, - 74.9333W, 230m, 11.V.-25.VII.2013, R. Apenborn leg.”, 46 exs., ( CLH, ZSM) ; “ Peru, Prov. Huánuco R. Yuyapichis, Stat. Panguana, 9°37ʹS, 74°35ʹW, Estanque 20.9.- 9.10.2007, leg. Burmeister ”, 1 ex., ( ZSM) ; “ Peru, Prov. Huánuco R. Yuyapichis, Stat. Panguana, 9°37ʹS, 74°35ʹW, Gelbtrichter limn. 20.9.- 9.10.2007, leg. Burmeister ”, 3 exs., ( ZSM) ; “ Peru, Prov. Huánuco R. Yuyapichis, Stat. Panguana, 9°37ʹS, 74°35ʹW, Estanque 20.9.- 7.10.2013, leg. Burmeister ”, 1 ex., ( ZSM) ; “ Peru, Prov. Huánuco R. Yuyapichis, Stat. Panguana, 9°37ʹS, 74°35ʹW, Wald Station 27.9.- 10.10.2017 leg. Burmeister ”, 8 exs., ( MUSM, ZSM) ; “ Peru, Dep. Huánuco Río Llulapichis, Panguana , 233m alt. S9°36.823ʹ, W74°56.127ʹ, 1.- 24.10.2010 Franz Wachtel”, 2 exs., ( ZSM) ; “ Peru, Huánuco Department, ACP Panguana , Lupunaweg , 250m, LF Krone/1 Röhre S9.61602° W74.93433 12/ 13.10.2015 leg. A. Gruppe & V. Abbt 2.1.7”, 1 ex., ( ZSM) ; “ Peru, Loreto, 160 km NE Iquitos, Explorama Camp, Rio Sucusari , 2 km from Rio Napo , 27-31-VIII-1992, P. E. Skelley window trap ”, 1 ex., ( CLH) ; “ Peru, Loreto, 80 km NE Iquitos, Explorama Lodge, Rio Yanamono 1 km from Amazon R., 25-28-VIII-1992, P. E. Skelley window trap ”, 1 ex., ( CLH) ; “ Peru, Loreto, Yucumama Lodge, Maranon river-Ucayali river, 6-20.viii.1994, - 4.1333S, - 74.0833W, Skelley leg.”, 2 exs., ( CLH) ; “ Peru Madre de Dios nr Puerto Maldonado Posadas Amazonas lodge @ Rio Tambopata S1248.115 W69 18.019 609ft (30-IX)-(3-X)-2004 CR Bartlett”, 2 exs., ( ZSM) . BRAZIL: “ Brazil, State of Amazonas, Río Autaz , Sammlung A. Zimmermann ”, 2 exs., ( ZSM) ; “ Brasilien , Cl. Müller leg.”, 1 ex., ( ZSM) .

Diagnosis. TL= 11.4–12.6 mm; TL-H = 10.7–11.9 mm; MW 6.0– 6.7 mm; pronotum testaceous with a black marking narrowly extended to anterior margin; elytron with basal fasciae in most of the specimens not confluent with humeral lateral spots, and without subbasal, longitudinal yellowish stripes; elytron with a large lateral spot just behind middle, and apical third largely irrorated ( Fig. 2C ); 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 apically obtuse in lateral view ( Fig. 6 ).

Differential diagnosis. Hydaticus subfasciatus can be separated from H. lateralis , H. devexus and H. xanthomelas in having a basal fascia on elytra, and elytral apex largely irrorated ( Fig. 6 ).

Distribution. Hydaticus subfasciatus is the most widespread species of the genus in South America, it has been recorded from the lowlands of Brazil, Bolivia, French Guiana, Dominica, Guatemala, Panama and Suriname ( Trémouilles 1996; Peck 2006; Ferreira (Jr.) & Braga 2009; Short 2013; Miller & Bergsten 2014), and was previously recorded from Peru by Hendrich et al. (2015). Its range of distribution has now extended to Colombia, Venezuela and Costa Rica ( Fig. 8).

Ecology. Hydaticus subfasciatus was generally found in rest pools and puddles ( Fig. 10A ), and in backwaters of intermittent forest streams, packed with leaf litter and rotten wood ( Fig. 10B ). Additional specimens were collected from two mainly shaded forest ponds, seasonally flooded during the rainy season from October to April, and with high fluctuation level. The ponds are rainwater fed and located in a primary tropical lowland rainforest surrounded by Aguaje palm trees ( Fig. 9B ). The muddy bottom was covered by broad layers of fallen and rotten leaves and twigs (see Hendrich et al. 2015). The species was associated with Agaporomorphus julianeae Hendrich, Apenborn, Burmeister & Balke, 2015 , A. tambopatensis Miller, 2005 , Hydrodytes opalinus (Zimmermann, 1921) , Vatellus grandis Buquet, 1840 , several unidentified species of Copelatus (all Dytiscidae ), Tropisternus chalybeus Laporte, 1840 , and several unidentified species of Helochares (all Hydrophilidae ) (see Hendrich et al. 2015). Hydaticus subfasciatus is sympatric with H. panguana sp. nov. and H. lateralis . The species is also attracted to light and can be easily obtained by using baited bottle traps.

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).

FIGURE 10. Habitats of H. subfasciatus in Panguana, Huànuco, Peru. Temporary forest pool with muddy bottom and rotten leaves (A), and rest pool in forest stream (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.