Hydraena (Hydraenopsis) pseudopalawanensis Freitag & Jäch, 2007

Freitag, Hendrik & Jäch, Manfred A., 2007, Revision of the species of Hydraena Kugelann (Coleoptera: Hydraenidae) from Palawan and Busuanga, with descriptions of eleven new species, and redescription of Hydraena (Hydraenopsis) scabra d’Orchymont, 1925, Zootaxa 1431, pp. 1-44 : 29-31

Hydraena (Hydraenopsis) pseudopalawanensis Freitag & Jäch , sp. n.

( Figs. 23 a–d)

Type locality. Estrella Falls, 7 km north of Narra, Municipality of Narra, 09°18'N 118°23'E, southern Palawan, Philippines.

Type material. Holotype ɗ ( NMW): “ PHIL.: Palawan 1994 7km N Narra, 2.4. Estrella Falls leg. Zettel (57)”, terminal parts of abdomen and aedeagus glued separately, one maxillary palpus and several parts of legs lacking. Paratypes: 1 ɗ ( NMW, mutilated, aedeagus lacking): “ PHIL.: Palawan, P. Princesa SSW Maratarpi Cabayugan R1 10°09'46’’N 118°49'29’’ E 0 2.6.2001, leg. Freitag (i5)”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa S Manturon, Cabayugan R.CR3 10°09'16''N 118°52'30'' E 29.3.2001, leg. Freitag (5)”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 14.VI.2001, leg. Freitag (i36) E”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 28.IX.2000, leg. Freitag (i42) E”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i53) E”; 1 ɗ ( NMW, aedeagus and terminal part of abdomen lacking): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i54) E”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i55) E”; 1 ɗ ( UPLB): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i56) E”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i57) E”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa S Manturon, Cabayugan R.CR4 10°09'28''N 118°53'26''E 31.VII.2001, leg. Freitag (i37)E”; 1 ɗ ( NMW): “ PHIL.: Palawan, P. Princesa Cabayugan R.; Nagdayan Creek, Manturon Bridge 10°10'N 118°53' E 27.3.2001, leg. Freitag (1)M”; 1 ɗ (WPU, aedeagus lacking): “ PHIL.: Palawan, P. Princesa Cabayugan R.; Nagdayan Creek, Manturon Bridge 10°10'N 118°53' E 27.3.2001, leg. Freitag (9)M”; 3 ɗɗ ( NMW): “ PHIL.: Palawan, P.Princesa; Luzviminda, forest creek, small fall, 9km SSW PPC; sandy banks, pool, c. 50m asl 9°39'N 118°38'E, 14.12.1994,leg.Freitag(17b)M”; 6 ɗɗ (3 exs. NMW; 1 ex. IRML, mutilated; 1 ex. UPLB; 1 ex. WPU): “ PHIL.: Palawan, P.Princesa; Luzviminda, forest creek, small fall, 9km SSW PPC; side pools w/ leaves, c. 50m asl 9°39'N 18°38'E, 14.12.1994,leg.Freitag(17c)M”; 1 ɗ ( NMW, aedeagus lacking): “ Philippines, Palawan centr. Ulangoan river, 18 km NE San Rafael 6.XII.1995, J. Kodada & B. Rigová lgt.”.

Additional material. 1 Ψ ( NMW): “ PHIL.: Palawan 1994 7km N Narra, 5.4. Estrella Falls leg. Zettel (59)”. This female was collected at the type locality of Hydraena pseudopalawanensis . Although it is most likely that this female belongs to H. pseudopalawanensis , we refrain from including it in the type series (for explanation, see below).

Diagnosis. Body 1.15–1.20 mm long. Colour and habitus as in Hydraena palawanensis (Fig. 10). Aedeagus ( Figs. 23 a–c) agrees in several principal characters with that of H. palawanensis , but differs in numerous other conspicuous characters: e.g., apical half of main piece more strongly curved (ventral/dorsal view), right margin of main piece without conspicuous emargination near insertion of paramere; presence of one dorsal seta; left paramere moderately long, slender, apically with five moderately long setae; right paramere ventromedially with a longitudinal row of ca. four moderately long setae.

We were not able to distinguish females of H. pseudopalawanensis and H. palawanensis reliably. Since both species occur in the same habitat, we were not able to identify all females from central Palawan (deposited in the NMW) properly: 1 Ψ: “PHIL.: Palawan, P. Princesa S Manturon, Cabayugan R.CR3 10°09'16''N 118°52'30'' E 29.3.2001 leg. Freitag (4)”; 1 Ψ: “PHIL.: Palawan, P. Princesa S Manturon, Cabayugan R.CR4 10°09'28''N 118°53'26''E 31.VII.2001, leg. Freitag (i38)E”; 1 Ψ: “PHIL.: Palawan, P. Princesa S Manturon, Cabayugan R.CR4 10°09'28''N 118°53'26''E 31.VII.2001, leg. Freitag (i39)E”; 1 Ψ: “PHIL.: Palawan, P. Princesa S Manturon, Cabayugan R.CR4 10°09'28''N 118°53'26''E 18.III.2001, leg. Freitag (i40)E”; 1 Ψ (mutilated): “PHIL.: Palawan, P. Princesa SE Manturon, Cabayugan R. 10°09.486'N 118°53.493' E 3.3.2001, leg. Freitag (i4)”; 1 Ψ: “PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i58) E”; 1 Ψ: “PHIL.: Palawan, P. Princesa SE Manturon, Karst spring LS4R 10°09'29''N 118°53'30''E 18.III.2001, leg. Freitag (i59) E”; 1 Ψ (mutilated): “PHIL.: Palawan, P. Princesa Cabayugan R.; Nagdayan Creek, Manturon Bridge 10°10'N 118°53' E 27.3.2001, leg. Freitag (6)M”; 1 Ψ: “PHIL.: Palawan, P. Princesa Cabayugan R.; Nagdayan Creek, Manturon Bridge 10°10'N 118°53' E 27.3.2001, leg. Freitag (10)M”; 5 ΨΨ: “PHIL.: Palawan, P.Princesa; Luzviminda, forest creek, small fall, 9km SSW PPC; sandy banks, pool, c. 50m asl 9°39'N 118°38'E, 14.12.1994,leg.Freitag(17b)M”; 9 ΨΨ: “PHIL.: Palawan, P.Princesa; Luzviminda, forest creek, small fall, 9km SSW PPC; side pools w/ leaves, c. 50m asl 9°39'N 18°38'E, 14.12.1994,leg.Freitag(17c)M”.

Distribution ( Fig. 31 ). Hydraena pseudopalawanensis is obviously confined to the island of Palawan, where it is not uncommon.

Ecology. Hydraena pseudopalawanensis resembles H. palawanensis even in ecological terms. The habitats include rather undisturbed (e.g. CR1) and to some extent anthropogenically influenced rural areas (e.g. CR3; Freitag 2005), suggesting a rather high ecological potency. Besides numerous specimens caught in emergence traps, some individuals were manually collected together with H. palawanensis in the same habitat (detritus interstitial).

Etymology. The species is named in reference to its close relationships with Hydraena palawanensis .

Figures

FIGURE 23. Hydraena pseudopalawanensis sp. n. a – c) aedeagus (paratype from Cabayugan, Palawan) in ventral, dorsal and lateral view; d) male sternite X and spiculum.

FIGURE 31. Collecting sites and geographical distribution of Hydraena species in Palawan and Busuanga, including enlarged map of St. Paul National Park: Hydraena palawanensis sp. n., H. pseudopalawanensis sp. n., H. spp. ΨΨ cf. palawanensis / pseudopalawanensis, Hydraena sp. 1, H. manguao sp. n., H. hosiwergi sp. n., H. busuanga sp. n., Hydraena sp. 2, Hydraena sp. 3.