Hydraena (Hydraenopsis) paulmoritz, Jäch & Díaz & Skale, 2013

Jäch, Manfred A., Díaz, Juan A. & Skale, Andre, 2013, The Hydraenidae (Coleoptera) Of The Republic Of Singapore, Raffles Bulletin of Zoology 61 (1), pp. 53-71 : 66-67

Hydraena (Hydraenopsis) paulmoritz , new species

( Figs. 2 , 11 , 15–17 )

Type locality. — Small stream near Than Mayom Waterfall, Trat Province, eastern Central Thailand .

Type material. — Holotype male ( NMW): “O – THAILAND 1990 Ko Chang (10) Than Mayom leg. Jäch 8.12.” . Paratypes: 6 males, 5 females ( NMW), same locality data as holotype ; 1 male, 1 female ( NMW): “ THAILAND: 28.11.1995 Udon Thani Prov. 5km E Udon Thani leg. Zettel (32)” ; 1 male ( NMW): “ THAILAND: 23.11.1995 Sakhon Nakhon leg. Zettel (21)” ; 1 male ( NMW): “ MALAYSIA, Kedah W-Langkawi, S of Telaga Tujuh , swamp, 22.11. 2006 H. ZETTEL leg. ( HZL 8 )” ; 1 male ( NMW): “ MALAYSIA 29.I.1992 KEDAH: Langkawi Pantai Kok leg. Jäch (13)” ; 1 male ( ZRC): “ SINGAPORE: 424 LHK 293 Butik [Bukit] Batok Nat. Park 18.12.1995 HK Lua et al coll.” ; 1 male ( ZRC): “ SINGAPORE: ZRC 784A 12.03. Sembawang 1992 leg. CM Yang & BK Kung ” ; 2 males, 3 females ( ZRC): “ SINGAPORE: 424 Y777B Senoko nr Sg [River] Sembawang 10.02.1992 (Y777b) leg. KKP Lim et al” ; 6 males, 6 females ( ZRC): “ SINGAPORE: 417 ZRC.6.18500 Bukit Timah Nat. Res. 13.12.1995 (NS 214) leg. HK Lua et al” ; 37 males, 22 females ( CDL, CSH, ISNB, NMW, ZRC): “ SINGAPORE, Bukit Timah swamp nr fishpond 9.IV.1997 Balke & Hendrich leg.” ; 1 female ( ZSM): “ SINGAPORE, Bukit Timah swamp nr fishpond, 9IV1997 Balke & Hendrich” ; 5 males ( ZSM): “ SINGAPORE: Bukit Timah N.R., small stream n[ear]. entrance 9.4.1997 Balke & Hendrich leg.” ; 1 male, 1 female ( ZSM): same label data, but “ SINGAPORE / [etc.]” ; 2 males, 1 female ( ZRC): “ Singapore, Bukit Timah University pond. 31 Oct 1957. DH Murphy.” ; 5 males, 2 females ( ZRC): “ Singapore, Bukit Timah Reserve 2.IV.1997, HK Lua leg. (NS 224)” ; 33 males, 20 females ( ZRC): same label data, but “ SINGAPORE [etc.]” ; 2 males, 3 females ( ZRC): “ SINGAPORE, Nee Soon Swamp-forest 16.IV.1992 D.H. Murphy & C.M. Yang leg. (Y790)” ; 4 females ( ZRC): same label data, but “ Singapore, Nee Soon Swamp Forest , 16.IV.1992 D.H. Murphy & C.M. Yang leg.(Y 790)” ; 1 female ( ZRC): “Nature Reserves Survey Nee Soon Swamp Forest NS 126E, #23 28 April 1994 ” ; 1 female ( ZRC): same locality, but “NS 126F” ; 1 female ( ZRC): “ Singapore. Lorong Banir [ Nee Soon ]. 6 May 1994 NS 149B KKP Lim et al.” ; 1 male ( NMW): “ SINGAPORE Sungei Buloh Wetland Res. 18.08.2004 leg. Jäch ( SGP 4 )” ; 1 male, 4 females ( NMW): “ SINGAPORE nr. Kranji Reservoir 18.08.2004 leg. Jäch ( SGP 5 )” ; 1 male ( NMW): “ INDONESIEN 1991 (12a) W-Sumatra, NSG Lemba Harau 15km NE Payakumbu leg. Jäch 11.2.” .

Additional material examined. — SINGAPORE: Additional specimens from Lower Peirce Reservoir and Senoko are kept in alcohol (deposited in the ZRC).

INDONESIA: 1 female ( ISNB): “ ” [printed], “ SUMATRA Da.Ranaoe [printed] Urwaldbach 20 I 29 [handwritten] Exp. Thienemann [printed] (60) FR2 [handwritten, underside of label]”, “Para-type” [printed, red], “A. d’Orchymont det [printed] H. insita Paratype [handwritten]”, “? H. paulmoritz det. Jäch ’12“ [handwritten]. This paratype of Hydraena insita from the type locality is a female (not a male); it is glued upside down, and its tergite X and gonocoxite agree very well with H. paulmoritz .

Diagnosis. — Habitus as in Fig. 2 . Externally, this species is very similar to H. formula and H. jacobsoni . Body length: 1.25–1.45 mm.

Males can be distinguished from H. formula by the foretibia being provided with a tiny tooth on mesal face near distal 0.3, by the slightly wider mesoventral process, by the unmodified metaventral plaques, by the last two abdominal segments being larger, and by the tergite X.

From H. jacobsoni males can be distinguished by the foretibia being straight and provided with a tiny tooth on mesal face near distal 0.3, by the last two abdominal segments being larger, and by the shape and size of tergite X.

Male terminal sternite and spiculum ( Fig. 11d ): Sternite wide and asymmetrical, strongly attenuate before lateral extensions; apex slightly emarginate, left side produced apicad.

Aedeagus ( Fig. 11a–c ): Very large. Apical half of main piece dorsoventrally flattened, very wide in dorsal/ventral view; phallobase not closed proximally. Distal lobe rather small, intricately shaped, near base with large dorsal setiferous hyaline appendage. Parameres articulately connected with main piece, inserted near middle of main piece; left paramere elongate, subrectangular, with numerous, variously long apical setae, some of which overreach aedeagal apex; right paramere longer, apically acute in lateral view, somewhat club-shaped in ventral/dorsal view, with groups of comparatively short setae on apex and ventral margin.

Gonocoxite ( Fig. 11e ) very similar to that of H. jacobsoni , slightly longer than in the latter; cavea distinctly transverse.

Female tergite X ( Fig. 11f ) more transverse than in H. jacobsoni . Hyaline margin slightly excised apically.

Spermatheca ( Fig. 11g, h ) more or less as in H. jacobsoni .

Secondary sexual characters: Male foretibia with a small denticle on mesal face near apical 0.3 (best seen in ventral view). Male mesoventrite more deeply impressed between mesoventral disc and mesoventral process. Male mesoventral process slightly thinner than in female. Male tergite X large, apically slightly excavate; apex asymmetrical, deeply emarginate, corners rounded, left corner longer than right one.

Variability: Foretibia sometimes very slightly curved in male and female. In some populations, the terminal abdominal segments are very large and distinctly asymmetrical.

Distribution. — Thailand (Sakhon Nakhon, Trat, Udon Thani), Malaysia (Kedah), Singapore ( Fig. 15 ), Indonesia (Sumatra).

In Singapore, this species was collected in the following locations: Bukit Timah Nature Reserve (University pond, swamp near fish pond, stream in Taban Valley), Bukit Batok Nature Park, Nee Soon Swamp Forest, Lower Peirce Reservoir (kept in alcohol only, ZRC), Kranji Reservoir, Sungei Buloh Wetland Reserve, and in Senoko near River Sembawang (natural habitat destroyed).

Etymology. — Named for Paul Moritz (Vienna, Austria). The epithet is a proper name in apposition.

Figures

Figs. 1–4. Habitus of: 1, Hydraena hendrichi, paratype; 2, H. paulmoritz, paratype; 3, H. singaporensis, paratype; 4, H. yangae, holotype, right foreleg (lateral view) depicted separately (photograph taken before right elytron got unhinged).

Fig. 11. Hydraena paulmoritz: a, aedeagus in lateral view; b, aedeagus, dorsal view; aedeagus, ventral view; d, male sternite X and spiculum; e, gonocoxite; f, female tergite X; g, h, spermatheca.

Fig. 15. Geographical map of Singapore, showing distribution of Hydraenidae.

Fig. 16. Taban Valley, Bukit Timah Nature Reserve, Singapore. Three species, H. hendrichi, H. jacobsoni, and H. paulmoritz were collected from this site. (Photograph by: L. Hendrich).

Fig. 17. Nee Soon Swamp Forest, Singapore; C.M. Yang on right. Four species, H. formula, H. jacobsoni, H. paulmoritz, and H. singaporensis were collected from this site. (Photograph by: L. Hendrich).