A revision of the Australian species of the water beetle genus Hydraena Kugelann (Coleoptera: Hydraenidae) PERKINS, PHILIP D. Zootaxa 2007 2007-05-31 1489 1 1 207 3N36D Published, 2007 Published 2007 [151,394,1066,1092] Insecta Hydraenidae Hydraena Animalia Coleoptera 43 44 Arthropoda species bidefensa sp. nov.   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. Depositedin the QMBA.   Paratypes(60):  New South Wales, Samedata as holotype (1 MCZ); Cabbage Tree Creek, Canberra/  Coast Road, gravel and sand at edge of small densely shaded stream in sclerophyll forest, elev.  85 m, 35° 34' S, 150° 2' E,  22 July 2000, N. Porch(93) (2 ANIC); 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(1 MCZ); 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(6 MCZ); 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) (8 FMNH); Dorrigo N. P., Eastend Blackbutt Track, window trap, subtrop. rainf., elev.  710 m, 30° 20' S, 152° 24' E,  28 February to 5 March 1980, A. Newton& M. Thayer, (1 USNM); Headwaters of Nullica River, headwater stream, 37° 4' S, 149° 47' E,  24 June 1997, J. & R.  Miller(site 659) (5 ANIC); same locality, 37° 4' S, 149° 47' E,  10 June 1999, J. & R.  Miller(site 659) (1 ANIC); Ingalla S. F.,  13 kmS Macksville, flight intercept trap, sclerophyll forest (wet), elev.  40 m, 30° 41' S, 152° 56' E,  12 June–26 August 1982, S. & J. Peck(1 ANIC); Macquarie Pass Nt. Pk., drift debris along stream, FMHD #83-273,  34° 34' S, 150° 40' E,  17 July 1983, L. E. Watrous(2 FMNH); Mt. Glennie,  16 kmE Woodenbong, rainforest, flight intercept trap, elev.  910 m, 28° 22' S, 152° 28' E,  25 November 1982–  3 February 1983, [collector not given] (1 QMBA); Twin Falls, 14 kmSE Mossvale, Berlesate ANIC 852, moss, grass, litter, elev.  600 m, 34° 38' S, 150° 29' E,  11 July 1982, L. Hill(7 ANIC); Unnamed creekdrains into Crawleys Creek, 36° 56' S, 149° 43' E,  13–22 June 1999, J. & R.  Miller(site 731) (12 ANIC); Unnamed creekdrains into Nungatta Creek, 36° 7' S, 149° 29' E,  21 February 1998, J. & R.  Miller(site 566a) (1 ANIC); same locality,  23 February 1998, J. & R.  Miller(site 566c) (1 ANIC); same locality,  12 February 2000, J. & R.  Miller(site 566c) (2 ANIC); same locality,  12 February 2000, J. & R.  Miller(site 566b) (4 ANIC); same locality,  13 February 2000, J. & R.  Miller(site 566d) (2 ANIC);   Queensland, Tambourine Mt., 27° 53' S, 153° 11' E,  1 January–30 December 1970, H. Franz(1 NMW);   Victoria, Croajingolong N. P., South-West Arm Rd.,  11 kmNW Mallacoota,  Banksiawoodland, ex window trap, FMHD #93-74, elev.  20 m, 37° 31' S, 149° 41' E,  10–23 February 1993, A. Newton& M. Thayer(1 ANIC).   Differential Diagnosis.Similar to  H. cultratain color pattern, the pronotum usually uniformly testaceous, contrasting with the dark brown head and elytra (Figs. 66, 173); differing therefrom by the larger size (ca. 1.50 vs. 1.25 mm), the slightly less transverse pronotum (w/l ca. 1. 24 vs. 1.31), the slightly more shining dorsum, and the straight plaques. The aedeagi of the two species distinctively differ (Figs. 69, 70).   Description.Size (length/width, mm) holotype: body (length to elytral apices) 1.47/0.58; head 0.22/ 0.33; pronotum 0.37/0.46, PA 0.38, PB 0.39; elytra 0.87/0.58. Head dark brown, lateral areas of clypeus lighter; pronotum, labrum, maxillary palpi and legs testaceous; elytra brown. Frons punctures slightly less than 1xef; interstices shining, 2–5xpd. Clypeus microreticulate. Mentum shining, very finely sparsely punctate; postmentum microreticulate. Genae raised, lacking posterior ridge. Pronotal punctures on disc slightly larger than those of frons, ca. 1xef; each puncture with very fine, rather long, recumbent seta; interstices shining, on disc 2–4xpd, anteriorly and posteriorly 1–3xpd; PF1 and PF4 absent; PF2 very shallow, almost absent; PF3 shallow, broad. Elytral punctures slightly smaller than largest pronotal punctures. Intervals not raised, shining, width ca. 2–3xpd, as are interstices between punctures of a row. Apices in dorsal aspect conjointy rounded to subtruncate, in posterior aspect margins form strong angle with one another. Ratios of P2 width and plaque shape (P2/w/l/s) ca. 4/1/10/8. P1 laminate; median carina weakly angulate in profile. P2 moderately narrow, l/w ca. 2/1, sides parallel, apex blunt. Plaques very narrow, carinate, parallel, located on sides of deep median depression; a small "accessory plaque" on each side of anterior angle of median depression, narrowly separated from carinate plaques. AIS flat, width at arcuate posterior margin 2x P2. Profemur with tiny acute tubercle on medial margin at about basal 1/3. Protibia thick, gradually widened from base to about distal 2/3, then excavate on medial margin; mesotibia simple. Metatibia slender, inner margin (microslide mount) with few, widely spaced, long, very fine hair-like setae over basal 1/2, apical 1/2 with widely spaced, short, stout spines. Last sternite very slightly asymmetrical, produced in small rounded point; last tergite with off-center, deep concavity. Aedeagus (Fig. 70) main-piece with large lobe on right side, bisinuate, pointed at apex, contours on side adjacent to right paramere the same as paramere contours; distal piece with thin apical lobe that extends beyond gonopore bearing flagellum; left paramere shorter and wider than right, setae in two groups; right paramere slender, nearly straight, setae in one group at weakly widened apex. Female last tergite with apicomedian incision delimiting two lobes, setae slender, tapering.   Etymology.Named in reference to the right paramere and the adjacent, similarly contoured process of the aedeagus.   Distribution.Currently known from Victoria, New South Wales, and southeasternmost Queensland. (Fig. 258).   Remarks.The color of the pronotum varies from clear testaceous, without a hint of a macula, to testaceous or light brown laterally, with a brown, diffusely margined macula. In some males the "accessory plaques" are smaller than in the holotype, and sometimes one of them will be confluent with the carinate 'regular' plaques. In females studied the plaques are not carinate, although they are distinctly raised posteriorly; also, the area of the "accessory plaques" is joined to the regular plaques, forming a shiny, but sparsely punctate, angle that joins the regular plaques. There is also some variation in the details of the male genitalia; for example, the aedeagus of the single male from Macquarie Pass National Park has slightly different raised portions near the middle of the ventral surface; otherwise the aedeagus is like that of the holotype. 1998-01-28 QMBA P. D. Perkins. Deposited -30.25 Bruxner Flora Reserve 1222 153.1 43 44 1 New South Wales holotype 1998-01-28 MCZ Same -30.25 Canberra 1222 153.1 Cabbage Tree Creek 43 44 1 New South Wales paratype 1998-01-26 2000-07-22 1998-01-26 ANIC, MCZ Road & N. Porch & Dorrigo N. P. & P. D. Perkins Rosewood Creek 85 -30.366667 Sassafras Creek 1222 152.66667 Coachwood Falls 43 44 FMHD #86-682 1 West Coast paratype 1980-02-28 1997-06-24 1980-02-28 FMNH, USNM, R A. Newton & M. Thayer & Dorrigo N. P. & East & Newton & Thayer 720 -37.066666 Headwaters of Nullica River 1183 149.78334 Blackbutt Track 43 44 1 Coast paratype 1999-06-10 1997-06-24 1980-02-28 ANIC, R Miller 720 -37.066666 Headwaters of Nullica River 1183 149.78334 Blackbutt Track 43 44 1 Coast paratype 1982-06-12 1982-08-26 1982-06-12 ANIC Miller & Ingalla S. F. & S. & J. Peck 40 -30.683332 Macquarie Pass Nt. Pk. 1220 152.93333 43 44 FMHD #83-273 1 Coast paratype 1982-11-25 1983-07-17 1982-11-25 FMNH, QMBA L. E. Watrous Mt. Glennie 910 -28.366667 Mossvale 1232 152.46666 Twin Falls 43 44 ANIC 852 1 Coast paratype 1982-07-11 1999-06-22 1982-07-11 ANIC, R L. Hill 600 -36.933334 Crawleys Creek 1184 149.71666 Unnamed creek 43 44 1 Coast paratype 1998-02-21 ANIC, R Miller -36.116665 Nungatta Creek 1189 149.48334 Unnamed creek 43 44 1 Coast paratype 1998-02-23 ANIC, R Miller 44 45 -36.116665 Nungatta Creek 1189 149.48334 Unnamed creek 43 44 1 Coast paratype [187,1015,152,178] 2000-02-12 ANIC, R Miller -36.116665 Nungatta Creek 1189 149.48334 Unnamed creek 44 45 1 Coast paratype 2000-02-12 ANIC, R Miller -36.116665 Nungatta Creek 1189 149.48334 Unnamed creek 44 45 1 Coast paratype [585,1432,192,218] 2000-02-13 ANIC, R Miller -36.116665 Nungatta Creek 1189 149.48334 Unnamed creek 44 45 1 Coast paratype [151,489,232,258] ANIC Miller 44 45 1 Coast paratype 1970-01-01 1970-12-30 1970-01-01 NMW H. Franz -27.883333 Tambourine Mt. 1235 153.18333 44 45 1 Queensland paratype FMHD Croajingolong N. P. South-West Arm Rd. 44 45 FMHD #93-74 1 Victoria paratype 1993-02-10 1993-02-23 1993-02-10 ANIC A. Newton & Thayer 20 -37.516666 1181 149.68333 44 45 1 Victoria paratype