Hydraena fenestella, Perkins, 2011

Perkins, Philip D., 2011, New species (130) of the hyperdiverse aquatic beetle genus Hydraena Kugelann from Papua New Guinea, and a preliminary analysis of areas of endemism (Coleoptera: Hydraenidae) 2944, Zootaxa 2944 (1), pp. 1-417 : 143

publication ID

https://doi.org/ 10.11646/zootaxa.2944.1.1

DOI

https://doi.org/10.5281/zenodo.5291851

persistent identifier

https://treatment.plazi.org/id/03B087E5-5BEB-FF1D-FF79-F2BAFB05F991

treatment provided by

Felipe

scientific name

Hydraena fenestella
status

sp. nov.

Hydraena fenestella View in CoL , new species

( Figs. 266 View FIGURE 266 , 268 View FIGURES 268–269 , 364–368 View FIGURES 364–369 , 418 View FIGURES 416–419 , 549 View FIGURES 547–550 )

Type Material. Holotype (male): Morobe Province: Lae–Bulolo road, ex dead leaves on mud bank, [GE est.] 900–1100 m, 6° 52' S, 146° 37' E, 28 xii 1964, M. E. Bacchus (MEB 123) ( NHM) GoogleMaps . Paratypes (75): Morobe Province: Same data as holotype (74 NHM); Huon Pen., road to Kwapsanek, 250 m, 6° 30.27' S, 146° 59.581' E, 31 iii 2006, Balke & Sagata ( PNG 24) (1 ZSM) GoogleMaps .

Differential Diagnosis. Very similar in dorsal habitus and ventral structures to H. herzogestella , the other member of the Fenestella group ( Figs. 266 View FIGURE 266 , 267 View FIGURE 267 ); differing therefrom in smaller size (ca. 1.22 vs. 1.32 mm) and in plaque ratios (ca. 5/1.5/5/4 vs. 6/1/6/5). Reliable determinations will require careful examination of the male genitalia ( Figs. 268, 269 View FIGURES 268–269 ). The meso- and metaventrite, pronotum, and very complicated chaetotaxy of the protibiae are illustrated with SEMs ( Figs. 364–368 View FIGURES 364–369 ).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.22/0.58; head 0.20/0.32; pronotum 0.32/0.47, PA 0.36, PB 0.47; elytra 0.72/0.58. Dorsum of head with frons brown, clypeus and labrum testaceous; pronotum testaceous, semi-transparent; elytra brown; legs light brown to testaceous; maxillary palpi testaceous, tip not darker. Dorsum shining.

Frons punctures ca. 1xef near eyes, smaller and much sparser medially; interstices shining, 1–2xpd laterally, ca. 4–6xpd medially. Clypeus effacedly microreticulate laterally, very finely sparsely punctulate medially. Mentum very sparsely very finely punctulate, shining. Postmentum anteriorly finely punctate, posteriorly moderately coarsely punctate, shining. Genae flat or very slightly raised, shining, without posterior ridge. Pronotum subtrapezoidal, ca. median 3/4 of anterior margin slightly arcuate to posterior, side very slightly emarginate between anterior angle and midlength; punctures on disc ca. 1xpd of largest frons punctures, interstices strongly shining, ca. 1– 4xpd; PF1, PF2 and PF4 absent; PF3 shallow.

Elytra with posterior declivity very gradual, summit slightly anterior to midlength; lateral explanate margins narrow. Punctures very small, shallow, ca. 1xpd pronotal punctures, and widely spaced. Intervals shining, ca. 3– 5xpd or greater. Apices in dorsal aspect conjointly rounded, in posterior aspect margins forming shallow angle with one another.

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 5/1.5/5/4. P1 ca. 1/3 P2; median carina nearly straight in profile, very slightly arcuate between coxae. P2 markedly concave, length ca. equal width, sides slightly converging toward blunt apex. Plaques roundly slightly raised, converging but not joining anteriorly, at sides of inverted Vshaped median depression. Metaventrite conjointly concave with P2 between mesocoxae. AIS width at straight posterior margin ca. equal P2. All legs of moderate length, tibiae very slender. Profemur (male) without tubercle next to trochanter; protibia arcuate, especially in basal 1/2, gradually increasing in width from base to distal 1/3, then slightly narrowing to apex. Meso- and metatibia straight. Abdominal apex symmetrical; last tergite (male) sharply rounded. Aedeagus as illustrated ( Fig. 268 View FIGURES 268–269 ).Female tergite X, gonocoxite, and spermatheca as illustrated ( Fig. 418 View FIGURES 416–419 ).

Etymology. "Little window"; named in reference to the transparency of the pronotum.

Distribution. Currently known only from two localities somewhat near Lea; one at the eastern extreme of Area 3 (900–1100 m), and one on the southern part of the Huon Peninsula (250 m) ( Fig. 549 View FIGURES 547–550 ).

ZSM

Bavarian State Collection of Zoology

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydraenidae

Genus

Hydraena

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