Hydraena (Hydraenopsis) pernambucana

Benetti, Cesar J., Valladares, Luis F., Delgado, Juan A. & Hamada, Neusa, 2020, Two new species of Hydraena Kugelann, 1794 from Brazil (Coleoptera: Hydraenidae), Zootaxa 4750 (3), pp. 391-402: 398-401

publication ID

https://doi.org/10.11646/zootaxa.4750.3.5

publication LSID

lsid:zoobank.org:pub:2645B622-9045-4E3E-94C5-BAB5E7C505FA

DOI

http://doi.org/10.5281/zenodo.3717914

persistent identifier

http://treatment.plazi.org/id/A7177723-4817-FFE5-BDBC-945BFB01287A

treatment provided by

Plazi

scientific name

Hydraena (Hydraenopsis) pernambucana
status

sp. n.

Hydraena (Hydraenopsis) pernambucana  sp. n.

( Figs 6–8View FIGURE 6View FIGURE 7View FIGURE 8)

Type locality. Brazil: Pernambuco State, Bonito Municipality, Stream (Igarapé) das Orquídeas  , 08°31’01.1”S; 35°43’36.2” W, 741 m a.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).GoogleMaps 

Type depository. Instituto Nacional de Pesquisas da Amazônia , Manaus, Brazil 

Description. Habitus as in Fig. 6View FIGURE 6. Size: Holotype: Male BL 1.38 mm; EL 0.84 mm; EW 0.60 mm.

Color ( Fig. 6View FIGURE 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.

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. 7View FIGURE 7. Phallobase symmetrical in ventral view ( Fig. 7AView FIGURE 7) and wide in lateral view ( Fig. 7BView FIGURE 7). 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.

Female: Not yet known.

Differential diagnosis. The new species is a member of the s teineri complex in the marginicollis  group, 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. 7View FIGURE 7).

Distribution. Currently known from the type locality (Bonito, Pernambuco State), northeast Brazil, near Atlantic coast ( Fig. 8View FIGURE 8).

Etymology. This species is named after the State of Pernambuco in Brazil, where the type locality is located. The name is in apposition in the adjective case.

Habitat. The type material was collected in a stream at 741 m a.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.

INPA

Instituto Nacional de Pesquisas da Amazonia

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydraenidae

Genus

Hydraena