Two new species of Hydraena Kugelann, 1794 from Brazil (Coleoptera: Hydraenidae) Benetti, Cesar J. Valladares, Luis F. Delgado, Juan A. Hamada, Neusa Zootaxa 2020 2020-03-12 4750 3 391 402 8Y4N8 Benetti & Valladares & Delgado & Hamada, 2020 Benetti & Valladares & Delgado & Hamada 2020 [151,655,1845,1872] Insecta Hydraenidae Hydraena Animalia Coleoptera 7 398 Arthropoda species pernambucana sp. nov. Hydraenopsis  ( Figs 6–8)     Typelocality. Brazil: Pernambuco State, Bonito Municipality, Stream (Igarapé) das Orquídeas, 08°31’01.1”S; 35°43’36.2” W, 741 ma.s.l.  Type material.   Holotype(male): “ BRAZIL: Pernambuco State, Bonito. / Igarapé(stream) das orquídeas;   741 m.a.s.l. / 08°31’01.1”S; 35°43’36.2” W;  3/v/2014. / N. Hamada, J. M. Nascimento& J. O. Silva, leg. // ♂// HOLO- TYPUS[red label] //  Hydraena( Hydraenopsis) pernambucana  sp. n.” (genitalia extracted and mounted on same card) ( INPA).    Typedepository. Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil   Description. Habitusas in Fig. 6. Size: Holotype: Male BL 1.38 mm; EL 0.84 mm; EW 0.60 mm.  Color( Fig. 6): Dorsum of head dark, labrum dark brown; pronotum with disc dark brown and lateral sides yellowish brown, especially in anterior angles; elytra dark brown, lateral margins and apex yellowish brown. Antennae and maxillary palps testaceous, apex of last palpomere yellowish; legs brown, tibiae testaceous. Ventral surface and epipleura dark brown.   FIGURE 6. Dorsal habitus of  Hydraena pernambucana  sp. n., holotype male. Scale bar = 0.5 mm.  Head: Labrum micropunctured, with an open v-shaped apicomedian emargination, external margins of lobes convex. Clypeus with small punctures very sparsely arranged and with only a few, small white setae. Punctures on frons slightly smaller and sparse on median area, interstices between punctures smooth and shiny.  Pronotum: Wider than long, maximum width at the middle length. Anterior margin weakly emarginate behind frons, with disc shiny and punctate. Scintilla absent. Sides weakly convex with margins serrate. Posterior margin slightly convex. Punctures on disc much larger and deeper than those on frons, interstices wide and shiny. Disc with a flat median area. PF1 absent, PF3 broad and shallow deep, PF2 shallow deep, PF4 absent.  Elytra: Arcuate laterally, short and wide, with marked shoulders. Lateral explanate margins moderate, wider in the elytra apical half, absent on apex. With 8 rows of regular impressed punctures between suture and shoulder; size of punctures similar to those of the pronotum or slightly larger. Intervals not raised, shiny. Apex rounded with a small sutural echancrure.  Mesoventrite: With a wide straight short carina.  Metaventrite: Plaques sparsely marked, at sides of a deep median area, densely punctured.  Legs: Protibia slightly expanded towards apex. Mesotibia and metatibia straight and slender.  Abdomen: Apex symmetrical.  Aedeagus: As in Fig. 7. Phallobase symmetrical in ventral view ( Fig. 7A) and wide in lateral view ( Fig. 7B). Main piece geniculate in lateral view, with a distinct, apical, long curled flagellum. Parameres long, moderately slender and starting at basal sides of main piece. Left paramere distally enlarged in lateral view.   FIGURE 7.  Hydraena pernambucana  sp. n., holotype male. Aedeagus in (A) ventral and (B) lateral view. Scale ba r= 0.1 mm.  Female: Not yet known.   Differential diagnosis. The new species is a member of the s teinericomplex in the  marginicollisgroup, sensu Perkins (2011), which includes two medium-sized species, without pronotal scintilla and aedeagi with main piece distally enlarged, parameres attached at basal half of main piece and a long flexible flagellum.  Hydraena pernambucana  sp. n.is close to  H. steineri Perkins, 2011(see Perkins 2011, fig. 120), but it differs mainly in the aedeagus morphology, having a geniculate main piece in lateral view and a distal lobe with a projected acute dorsal area ( Fig. 7).   Distribution. Currently known from the typelocality (Bonito, Pernambuco State), northeast Brazil, near Atlantic coast ( Fig. 8).   Etymology. This species is named after the State of Pernambucoin Brazil, where the typelocality is located. The name is in apposition in the adjective case.  Habitat. The typematerial was collected in a stream at 741 ma.s.l., located in a semideciduous seasonal forest in the Atlantic Forest biome. The measured water pH was 8.0 and conductivity was 57.3 µS/cm. 2575868876 [151,1259,1952,1979] das Orquideas Brazil Pernambuco State 7 398 1 Pernambuco holotype 2575868875 2014-05-03 HOLO-, TYPUS, INPA N. Hamada & J. M. Nascimento & J. O. Silva Brazil 741 -8.516972 Igarape 1 -35.726723 8 399 742 1 Pernambuco holotype 2575868879 [199,1093,296,323] Brazil Instituto Nacional de Pesquisas da Amazonia Manaus 8 399 1 holotype