Hydraena antaria, Published, 2007

PERKINS, PHILIP D., 2007, A revision of the Australian species of the water beetle genus Hydraena Kugelann (Coleoptera: Hydraenidae), Zootaxa 1489 (1), pp. 1-207: 36-37

publication ID

http://doi.org/ 10.11646/zootaxa.1489.1.1

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scientific name

Hydraena antaria

new species

Hydraena antaria   new species

( Figs. 47 View FIGURES 45–48 , 53 View FIGURES 53–56 , 240)

Type Material. Holotype (male): New South Wales, Bruxner Flora Reserve , ex. leaf/twig debris in streambed pools, 30° 15' S, 153° 6' E, 28 January 1998, P. D. Perkins. Deposited in the QMBA GoogleMaps   . Paratypes

(186): New South Wales, Same data as holotype (139 MCZ); Buckenbowra S. F., WNW Nelligen, Sugarloaf Creek, gallery subtropical rainforest, wet leaves and flood debris, forest stream, FMHD #87-268, elev. 145 m, 35° 34' S, 150° 0' E, 18 February 1987, A. Newton & M. Thayer (834) (1 FMNH); Dorrigo N. P., Rosewood Creek, upstream from Coachwood Falls, ex. gravel/sand stream bank, elev. 650 m, 30° 22' S, 152° 40' E, 26 January 1998, P. D. Perkins (2 MCZ); Dorrigo N. P., Sassafras Creek, upstream from Casuarina Falls   , ex. bare rocks in splash zone, elev. 650 m, 30° 22' S, 152° 40' E, 27 January 1998, P. D. Perkins (5 QMBA); Dorrigo N. P., Sassafras Creek, upstream from Casuarina Falls   , silty gravel bank in shade, elev. 650 m, 30° 22' S, 152° 40' E, 27 January 1998, P. D. Perkins (19 QMBA); Dorrigo N. P., south slope Dome Mt., subtropical rainforest, wet leaves and flood debris, forest stream, FMHD #86-682, elev. 720 m, 30° 21' S, 152° 46' E, 28 December 1986, A. Newton & M. Thayer (778) (12 FMNH); Headwaters of Nullica River, headwater stream, 37° 4' S, 149° 47' E, 10 June 1999, J. & R. Miller (site 659) (8 ANIC).

Differential Diagnosis. Similar to H. luminicollis   and H. spinissima   in body size, dorsal punctation, and general coloration; differing from both by the testaceous humeral angles of the elytra ( Figs. 45, 47, 48 View FIGURES 45–48 ); additionally differing from H. luminicollis   by the narrower pronotum and the longer plaques, and from H. spinissima   by the very faint pronotal macula and the more convex elytra. Based on aedeagal similarities, H. antaria   is clearly more closely related to H. luminicollis   than to H. spinissima   ( Figs. 52 View FIGURES 49–52 , 53, 55 View FIGURES 53–56 ).

Description. Size (length/width, mm) holotype: body (length to elytral apices) 1.60/0.66; head 0.24/ 0.35; pronotum 0.38/0.49, PA 0.42, PB 0.42; elytra 0.94/0.66. Head dark brown, lateral areas of frons slightly lighter; labrum and mentum testaceous; pronotum testaceous, at most only very faintly darker on disc; elytra mostly dark brown, small spot at shoulders and very faintly over posterior declivity light brown to testaceous; legs and palpi testaceous, tip of palpi not darker.

Frons punctures ca. 1xef; interstices shining, 1–2xpd. Clypeus microreticulate laterally, finely sparsely punctate medially. Mentum shining, very finely sparsely punctate; postmentum microreticulate. Genae raised, lacking posterior ridge. Pronotal punctures on disc ca. 2xpd those of frons, interstices shining, anteriorly and posteriorly 0.5–1xpd, on disc 1–3xpd; PF1 and PF4 absent; PF2 very shallow; PF3 shallow, broad.

Elytral punctures basally ca. 1xpd largest pronotal punctures, becoming much finer over posterior declivity. Intervals not raised, shining, width on disc about 2xpd, as are interstices between punctures of a row. Apices in dorsal aspect conjointly rounded, in posterior aspect margins form very weak angle with one another.

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 3/2/9/5. P1 laminate; median carina angulate in profile. P2 l/w ca. 1.5/1, sides parallel, apex blunt. Plaques parallel or nearly so, raised, abruptly so at posterior extreme, located in posterior 1/2 of metaventrite on sides of deep median subtriangular depression. AIS flat, width at arcuate posterior margin 2x P2. Profemum (male) with minute, sharp tubercle in median margin before midlength; protibia gradually widened to about distal 1/3, then markedly excavate, a prominent spine at base of excavation; mesotibiae slender; metatibia slender, widest near midlength, medial margin over distal 1/2 emarginate, surface flat and bearing hair-like setae, most of which lie flat on cuticle, but some extending slightly beyond apex of tibia. Last tergite with small, slightly off-center concavity.

Aedeagus ( Fig. 53 View FIGURES 53–56 ) main-piece with large process on right side joined to two median enlargements; distal piece left side (ventral view) with several rounded lobes and one elongate, curving process; left paramere narrowed apically, setae apically and along distal 1/4 of ventral margin, and second group of very short setae on dorsal margin; right paramere with large ventral lobe, and slender, pointed dorsal lobe, setae in three groups. Female last tergite with apicomedian incision, delimiting two lobes, setae slender, tapering.

Etymology. "For raising or hoisting"; named in reference to the convex elytra and the plaques, which are raised posteriorly.

Distribution. Currently known from northeastern and southeastern New South Wales (Fig. 240).

Remarks. Both sexes have the plaques abruptly raised at the posterior extreme, although more strongly so in males than in females.


Museum of Comparative Zoology


Field Museum of Natural History


Departamento de Geologia, Universidad de Chile


Australian National Insect Collection