Hydraena (Hydraenopsis) scabra d'Orchymont , 1925

Freitag, Hendrik, 2013, Hydraena (Hydraenopsis) ateneo, new species (Coleoptera, Hydraenidae) and other aquatic Polyphaga from a small habitat patch in a highly urbanized landscape of Metro Manila, Philippines, ZooKeys 329, pp. 9-21 : 15-16

Hydraena (Hydraenopsis) scabra d'Orchymont, 1925 Fig. 2B

Hydraena scabra d’Orchymont 1925: 200 (orig. descr.); Freitag and Jäch 2007 and references therein (redescr., first records from many islands).

Material examined.

1 ♂, 1 ♀ (PNM): "PHIL.: Luzon, Quezon City, Ateneo de Manila Campus, near San Jose Seminary, temporary headwater creek, leaf litter; 14°38'06.4"N, 121°04'50.2"E, 39m asl.; 16.Nov.2012, leg. Go, Vidal & Freitag (ADM2d)M"; 3 ♂♂, 1 ♀ (CFM): "PHIL.: Luzon, Quezon City, Ateneo de Manila Campus, near San Jose Seminary, creek side pool, leaf litter; 14°38'05.5"N, 121°04'49.8"E, 37m asl.; leg. Go, Vidal & Freitag 16.Nov.2012 (ADM2e)M"; 1 ♂, 1 ♀ (PNM): "PHIL: Luzon, NCR, Quezon City, Ateneo de Manila Campus; spring creek N of Jesuit Residence, leaf packs; 14°38'29.6"N, 121°04'53.6"E, 62m asl; leg. Vidal, Go & Freitag 16.Nov.2012 (ADM3d)M"; 4 ♂♂, 1 ♀ (CFM): "PHIL: Luzon, NCR, Quezon City, Ateneo de Manila Campus; creek side pool N of Jesuit Residence, subm. leaf litter; 14°38'29.5"N, 121°04'53.6"E, 62m asl; leg. Vidal, Go & Freitag 16.Nov.2012 (ADM3e)M".

Distribution.

Hydraena scabra is known from many islands all over the Philippines (see checklist).

Ecology.

Hydraena scabra is an abundant representative in disturbed lotic water systems, but occurs also in stagnant waters like paddy fields and ponds. On the other hand, this species is often rare or lacking in undisturbed natural sites, where several other species of Hydraena can be found syntopically. This suggests a high ecological potency, but low competitiveness.