Gymnochthebius australis (Blackburn)

Perkins, Philip D., 2005, A revision of the water beetle genus Gymnochthebius Orchymont (Coleoptera: Hydraenidae) for Australia and Papua New Guinea, Zootaxa 1024 (1), pp. 1-161: 1-161

publication ID

http://doi.org/ 10.11646/zootaxa.1024.1.1

publication LSID

lsid:zoobank.org:pub:03B4C12B-E293-4006-86E8-14AA4634F663

persistent identifier

http://treatment.plazi.org/id/975A7812-FFDE-FFF6-FEC7-79E2691AF5AE

treatment provided by

Felipe

scientific name

Gymnochthebius australis (Blackburn)
status

new combination

Gymnochthebius australis (Blackburn)   new combination

( Figures 1 View FIGURE 1 , 2 View FIGURE 2 , 78)

Ochthebius australis Blackburn 1888: 835   .

Ochthebius fischeri Deane 1931: 170   (holotype male deposited in MVMA, examined; type locality

Victoria: Melbourne). New synonymy.

Ochthebius leai Deane 1931: 171   (holotype female deposited in MVMA, examined; type locality Tasmania). New synonymy.

Type Material. Lectotype of Ochthebius australis   (hereby designated; male): Australia: South Australia: Port Lincoln; [labels: "TYPE [red disc]"; "Port Lincoln, S. Australia (Blackburn)"; " Australia. Blackburn coll. B. M. 1910­236"; " Ochthebius australis, Blackb.   "; Lectotype [red] O. australis Blackburn   by P. D. Perkins"; deposited in the BMNH. The type series comprises two males and one female. One male is hereby designated lectotype; I have dissected this male, and drawn the genitalia ( Fig. 2 View FIGURE 2 ). The two other specimens (on one pin) are labelled as paralectotypes and have the same locality data as the lectotype; I have dissected this male also.

Differential Diagnosis. Recognized by the distinctive fringe of setae on the elytral margin, the finely sparsely punctate pronotum, the narrow median groove and nonmicroreticulate foveae, and the elytral intervals wider than the serial punctures. Very similar in dorsal habitus to G. setosus   (which see), but less strongly punctate and with setae on the elytra less prominent. Reliable determinations, especially of abraded specimens (e.g., the lectotype), will be based on study of the male genitalia which are similar in being strongly barbed, but differ in shapes of the lobes and especially the shape of the duct, which in G. australis   is short, asymmetrical, sinuate in lateral aspect, and has a cuticular crease at the apex ( Figs. 2 View FIGURE 2 , 4 View FIGURE 4 ).

Description. Size (length/width, mm) of the lectotype: body (length to elytral apices) 1.67/0.73; head 0.27/0.44; pronotum 0.41/0.58; elytra 1.01/0.73. Form moderately ovate, moderately convex. Color brown, head darker, dorsal reliefs shining.

Frons very finely sparsely punctate, very sparsely pubescent; interocular foveae deep; interocular tuberculi distinct; basal midlongitudinal fovea confluent with interocular foveae. Frontoclypeal suture deeply impressed, bisinuate. Clypeus midlength 0.5 apical width, very sparsely punctate; pubescence sparse on disc, denser laterally. Labroclypeal suture straight in dorsal view, evenly arcuate in anterior view. Labrum width twice length; anterior margin arcuate, with small upturned apicomedian tooth.

Pronotum lateral hyaline border well developed, origin at base of lateral depression, arcuate to posterior angles, very narrow around posterior margin; arcuate setae, originating from basal sides of pronotum, on top of lateral hyaline border; anterior margin of pronotum slightly arcuate in midregion; each lateral depression with posterior in form of right angle, lateral margin distinctly setose; lateral fossulae deep, lacking microsculpture, small pit at anterior extreme; pronotal disc moderately convex, extremely finely sparsely punctate, each puncture with a fine recumbent seta; median groove shallow, narrow, extending nearly to margins, tapering at ends; anterior foveae deep, small, slightly wider than median groove, slightly elongate; posterior foveae oblique, linear impressions nearly 1/2 as long as and as wide as median groove; posterolateral angles with indistinct shallow impressions.

Elytra moderately convex on disc, sides nearly vertical in basal 0.5, with six rows of small, closely spaced punctures between suture and humeri; each puncture with a fine, short decumbent seta that nearly overlaps base of following seta; intervals flat or slightly rounded, width 1.5­2.5x that of punctures; intervals with very sparse, erect, moderately long setae; summit of declivity near posterior 0.66, where elytra are transversely markedly convex; elytral explanate margin very narrow, with fringe of long setae.

Metasternal glabrous area length equal width, suboval, shining, convex. Abdominal ventrites 1­3 and basally 4 with hydrofuge pubescence.

Females have the explanate elytral margin similar to males; the anterior margin of the labrum has a small apicomedian tooth, smaller than that of males.

Aedeagus ( Fig. 2 View FIGURE 2 ): Length of main­piece 0.27 mm, length to tip of parameres 0.28 mm; lobes relatively long, in ventral aspect apical width slightly greater than paramere width, each lobe with strong barb near midlength; notches U­shaped, of about equal depth and width; narrowest width of ventral notch less than greatest width of lobes; duct short, apex asymmetrical and with cuticular crease, in lateral aspect markedly sinuate; apical paramere seta elongate, ca. 2x length of next longest seta.

Distribution. Widely distributed in a near­coastal belt from South Australia to southern Queensland; also present in Tasmania (Fig. 78).

Notes. The lectotype ( Fig. 1 View FIGURE 1 ) has many abraded setae and is duller than most specimens.

Material Examined (1708): Australia: Australian Capital Territory: Angle Crossing, Murrumbidgee River , sandy mudflats at edge of river, elev. 595 m, 35° 34' S, 149° 6' E, 15 October 2000, N. Porch (NP 13) (4 ANIC) GoogleMaps   ; Black Mtn. , light trap, 35° 16' S, 149° 6' E, 28 February 1968, M. S. Upton (1 ANIC) GoogleMaps   ; same locality, 35° 16' S, 149° 6' E, 1 March 1968, M. S. Upton (1 ANIC) GoogleMaps   ; same locality, 35° 16' S, 149° 6' E, 27 March 1968, M. S. Upton (1 ANIC) GoogleMaps   ; Canberra, L. Burley­Griffin , 35° 18' S, 149° 7' E, 30 March 1965, M. E. Bacchus (MEB 222) (36 BMNH) GoogleMaps   ; Canberra, stream entering L. Burley­Griffin , stream, 35° 18' S, 149° 7' E, 30 March 1965, M. E. Bacchus (MEB 221) (234 BMNH) GoogleMaps   ; Casuarina Sands on Murrumbidgee River, coarse sand, gravel and roots (Casuarina) at edge of riffle zone of large river; Casuarina riparian forest, elev. 475 m, 35° 19' S, 148° 57' E, 21 July 2000, N. Porch (NP 69) (20 ANIC) GoogleMaps   ; nr. Canberra , 35° 22' S, 149° 5' E, 28 March 1965, M. E. Bacchus (MEB 219) (3 BMNH) GoogleMaps   ; New South Wales: Gilgandra , 31° 42' S, 148° 40' E, 19 November 1992, C. Watts (54 SAMA) GoogleMaps   ; Manar Creek, Canberra­Coast Road , 35° 17' S, 149° 39' E, 18 May 1967, E. Britton & S. Misko (1 ANIC) GoogleMaps   ; Mudgee , 32° 34' S, 149° 35' E, 1 February 1935, H. J. Carter (2 UQIC) GoogleMaps   ; Rock Flat Creek , 7 mi. E of Cooma, 33° 48' S, 151° 12' E, 31 March 1965, M. E. Bacchus (MEB 223) (25 BMNH) GoogleMaps   ; Sydney [no date], 33° 52' S, 151° 12' E, Lea (2 SAMA) GoogleMaps   ; Tamworth [no date], 31° 5' S, 150° 55' E, Lea (3 SAMA) GoogleMaps   ; Wilbertree Flat , in pitfall trap baited with fish, damp patch near river, 32° 30' S, 149° 35' E, 28 January 1991, V. Lorimer (9 ANIC) GoogleMaps   ; Queensland: Braemar S.F., via Kogan , pitfall­Callitris, 26° 59' S, 150° 54' E, 1 October 1979 –28 Febru­ ary 1980, G. B. Monteith (1 ANIC) GoogleMaps   ; Goondiwindi , 14 km NE, in debris at edge of pond, 28° 29' S, 150° 23' E, 25 October 1991, T. Gush (40 ANIC) GoogleMaps   ; Moran's Creek, 760–820 m a.s.l., SW of O'Reilly's Rainforest Guesthouse, Lamington NP, ca. 80 km S Brisbane [beeline], 28° 14’ 11.2” S 153° 08’ 01.1” E – 28° 13’59” S 153° 07’ 27” E, River ( Moran's Creek ), ca. 2–4 m wide, through dense rain forest, Eucalypt forest and open grassland, 760–820 m a.s.l., 24 August 2004, M. A. Jäch (AU 9) (7 NMW) GoogleMaps   ; Running Creek Road, SE Rathdowney, ca. 25 km SSE Beaudesert [beeline], 28° 15’20.2” S 152° 53’ 49.1” E, small road side ditch (remnants of small swampy meadow), 25 August 2004, M. A. Jäch (AU 12) (12 NMW) GoogleMaps   ; South Australia: 10 K N Forreston, 34° 43' S, 138° 54' E, 3 September 1999, C. H. S. Watts (1 SAMA) GoogleMaps   ; 13 km W Meadows , 35° 11' S, 138° 37' E, 26 September 1996, C. Watts (3 SAMA) GoogleMaps   ; Adelaide [no date], 34° 55' S, 138° 36' E, Bakewell (2 BMNH) GoogleMaps   ; same locality, 34° 55' S, 138° 36' E, P. D. Morris (10 BMNH) GoogleMaps   ; same locality, 34° 55' S, 138° 36' E, C. Watts (2 SAMA) GoogleMaps   ; Coolawang Ck Mt Scrub Rd , 35° 36' S, 138° 26' E, 28 October 1994, Aust. water quality centre 3515 (1 SAMA) GoogleMaps   ; Epsom Spr., White Flat Rd., Eyre Pen. , 34° 31' S, 135° 51' E, 14 December 1976, J. E. Bishop & J. H. Diener (5 SAMA) GoogleMaps   ; Finniss River Braeside Rd, 35° 21' S, 138° 47' E, 3 November 1994, Aust. water quality centre 3922 (1 SAMA) GoogleMaps   ; Hutt River downstream of Spalding , 33° 35' S, 138° 36' E, 14 November 1994, Aust. water quality centre 3583 (1 SAMA) GoogleMaps   ; Inman River, near Glacier Rock , sandy mud and litter at edge of small stream in pasture, elev. 40 m, 35° 29' S, 138° 31' E, 1 January 2003, N. Porch (75) (168 ANIC) GoogleMaps   ; Light River Pinkerton Plains , 34° 24' S, 138° 38' E, 24 May 1994, Aust. water quality centre 3449 (1 SAMA) GoogleMaps   ; Marne River Eden Valley , 34° 40' S, 139° 6' E, 13 October 1994, Aust. water quality centre 3842 (1 SAMA) GoogleMaps   ; Marne River South of Cambrai , 34° 40' S, 139° 17' E, 12 October 1994, Aust. water quality centre 3843 (1 SAMA) GoogleMaps   ; Middle R. d.strm dam Lagoon Flat , 34° 24' S, 138° 38' E, 30 September 1994, Aust. water quality centre 3715 (1 SAMA) GoogleMaps   ; Mosquito Ck upstrm Struan , creek, 37° 6' S, 140° 47' E, 22 February 1994, Aust. water quality centre 3020 (1 SAMA) GoogleMaps   ; Mt Barker Ck upstrm Mt Barker Sprgs , creek, 35° 5' S, 138° 55' E, 12 May 1994, Aust. water quality centre 1875 (1 SAMA) GoogleMaps   ; Murray Bridge [no date], 35° 7' S, 139° 16' E, H. M. Hale (4 SAMA) GoogleMaps   ; Murray River [no date], 34° 57' S, 139° 16' E, A. H. Elston (4 AMSA Sydney ); same locality, 34° 57' S, 139° 16' E, not given (1 SAMA) GoogleMaps   ; Murray River , shore washing, 34° 57' S, 139° 16' E, 27 November 1982, Endrödy­Younga (AU­13) (15 TMSA) GoogleMaps   ; North Para R. Rowland Flat , 34° 34' S, 139° 55' E, 11 October 1994, Aust. water quality centre 3443 (1 SAMA) GoogleMaps   ; Onkaparinga R. Hahndorf Bridge, 35° 1' S, 138° 47' E, 26 October 1994, Aust. water quality centre 3267 (1 SAMA) GoogleMaps   ; Pt. Lincoln , 34° 43' S, 135° 50' E, 1–30 January 1982, C. Watts (6 SAMA) GoogleMaps   ; The Deep Ck Dog Trap Ck , creek, 35° 36' S, 138° 12' E, 15 June 1994, Aust. water quality centre 3502 (1 SAMA) GoogleMaps   ; Tod R., White Flat , 34° 31' S, 135° 50' E, 10 November 1994, Aust. water quality centre 3683 (6 SAMA) GoogleMaps   ; Williamstown , 34° 40' S, 138° 53' E, 1–30 October 1961, C. Watts (2 SAMA) GoogleMaps   ; Tasmania: Coal River , 2.5 km E of Campania, mud and litter at edge of small river in pasture, elev. 45 m, 42° 40' S, 147° 28' E, 14 February 2000, N. Porch (42) (21 ANIC) GoogleMaps   ; Little Piper River at bridge on B82, sandy litter at edge of river in scrubby forest, elev. 15 m, 41° 2' S, 147° 14' E, 12 February 2000, N. Porch (3) (53 ANIC) GoogleMaps   ; Nile River , 5 km NE of Deddington, cobble­bank of small river; remnant sclerophyll forest, pasture, elev. 275 m, 41° 34' S, 147° 28' E, 17 February 2000, N. Porch (72) (1 ANIC) GoogleMaps   ; [no other locality data; no date], A. M. Lea (1 MVMA)   ; Orielton Rut u/s of Orielton Lagoon, 3.5 km NNW of Sorell, mud at edge of brackish? Estuary , elev. 2 m, 42° 45' S, 147° 32' E, 14 February 2000, N. Porch (37) (54 ANIC) GoogleMaps   ; Pipers Brook at B82 bridge, 2.7 km NW of Pipers Brook, muddy litter at edge of small pools of perennial creek, elev. 50 m, 41° 3' S, 147° 10' E, 12 February 2000, N. Porch (17) (3 ANIC) GoogleMaps   ; Victoria: Avoca River at Avoca , litter and gravelly sand at edge of small river; pasture, elev. 225 m, 37° 5' S, 143° 28' E, 12 March 2000, N. Porch (71) (42 ANIC) GoogleMaps   ; Base of Trentham Falls, 2.3 km N Trentham, amongst wet gravel at edge of waterfall splash pool and outlet. Dry sclerophyll forest, elev. 640 m, 37° 22' S, 144° 19' E, 31 January 1999, N. Porch (NP 23) (1 ANIC) GoogleMaps   ; Coliban River , 5 km W of Redesdale, gravel at edge of small river flowing through pasture, elev. 280 m, 37° 0' S, 144° 28' E, 28 November 1999, N. Porch & N. Krause (8) (4 ANIC) GoogleMaps   ; Dandenong Creek at Brady Road, Dandenong North , mud at edge of artificial dam in pasture, elev. 30 m, 37° 57' S, 145° 13' E, 28 September 1999, N. Porch (53) (10 ANIC) GoogleMaps   ; Diamond Ck. , 1.8 km NNE Tonimbuk, on fine­medium sand and amongst litter on sandbar in small creek flowing through dry sclerophyll forest, elev. 110 m, 37° 59' S, 145° 42' E, 4 February 1999, N. Porch (NP 25) (19 ANIC) GoogleMaps   ; Eel Hole Ck. on Nadenbouschs Rd. S44 LaTrobe C. Survey, creek, 38° 18' S, 146° 23' E, 8 December 1978, not given (3 MVMA) GoogleMaps   ; same locality, 38° 18' S, 146° 23' E, 9 December 1978, not given (2 MVMA) GoogleMaps   ; Fryans Ck, 15 K S Stawell , creek, 37° 3' S, 142° 46' E, 13 January 1997, C. Watts (2 SAMA) GoogleMaps   ; Hopkins River at Western Highway, ex silty mud in shade under bridge at edge of pool. Pasture , but stream relatively natural, elev. 310 m, 37° 19' S, 143° 1' E, 3 March 1999, N. Porch (NP 40) (95 ANIC) GoogleMaps   ; Kororoit Creek, at Sydenham­Melton Road , organic mud and litter at edge of pool in dry creek in pasture and degraded riverine forest, elev. 110 m, 37° 41' S, 144° 38' E, 17 February 2002, N. Porch (91) (108 ANIC) GoogleMaps   ; Lerderderg River , 6.8 km N Bacchus Marsh, wet gravel and cobbles at edge of small river; dry sclerophyll forest, elev. 135 m, 37° 37' S, 144° 25' E, 20 September 1999, N. Porch (64) (5 ANIC) GoogleMaps   ; Little River at Bacchus Marsh­Geelong Road, sandy gravel and muddy sand at edge of still pool of perennial creek in riparian forest remnants, elev. 105 m, 37° 50' S, 144° 23' E, 20 October 1999, N. Porch (36) (169 ANIC) GoogleMaps   ; Loddon River at Guildford , sand and sandy mud at edge of small stream in pastureland, elev. 235 m, 37° 9' S, 144° 9' E, 17 February 2002, N. Porch (86) (8 ANIC) GoogleMaps   ; Loddon River at Newstead , gravel at edge of small river flowing through pasture, elev. 210 m, 37° 6' S, 144° 3' E, 27 November 1999, N. Porch (47) (4 ANIC) GoogleMaps   ; Melbourne [no date], 37° 58' S, 144° 58' E, (1 MVMA) GoogleMaps   ; Moorabool River East Branch , 2.0 km SE Ballark, gravel at edge of small river flowing through pasture, elev. 310 m, 37° 44' S, 144° 7' E, 20 October 1999, N. Porch (58) (20 ANIC) GoogleMaps   ; Morwell River on Driffield ­ Yinnar Rd., S 43, LaTrobe C. Survey , 38° 19' S, 146° 19' E, 6 December 1978 (1 MVMA) GoogleMaps   ; Mt Emu Ck., on Vite Vite Rd. , 2 km S Pura Pura, on/in sandy mud at edge of slow flowing stream in pasture, elev. 185 m, 37° 50' S, 143° 6' E, 4 March 1999, N. Porch (NP 47) (40 ANIC) GoogleMaps   ; Tarago River, Bellbird Park at old Princes Highway , ex sandy mud and litter in sun along edge of slow flowing river in pasture, elev. 50 m, 38° 5' S, 145° 48' E, 15 January 1999, N. Porch (NP 21) (50 ANIC) GoogleMaps   ; Toomuc Ck., at Princes Highway, Pakenham , on silty sand and sand along margins of gravelly 'semi­urban' creek, elev. 45 m, 38° 4' S, 145° 28' E, 4 February 1999, N. Porch (NP 26) (7 ANIC) GoogleMaps   ; Werribee River in Werribee Gorge , gravel at base of gravel bank of small creek; dry sclerophyll forest, elev. 145 m, 37° 39' S, 144° 21' E, 20 September 1999, N. Porch (51) (20 ANIC) GoogleMaps   ; Wimmera River at Western Highway , muddy sand at edge of river pool in dry sclerophyll/riverine forest, elev. 100 m, 36° 25' S, 141° 58' E, 1 March 2000, N. Porch (61) (232 ANIC) GoogleMaps   . Representative specimens to be deposited in CMNH, FMNH, MCZ, NPC, QMBA, and USNM   .

ANIC

Australian National Insect Collection

SAMA

South Australia Museum

UQIC

University of Queensland Insect Collection

NMW

Naturhistorisches Museum, Wien

AMSA

Albany Museum

TMSA

Transvaal Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydraenidae

Genus

Gymnochthebius

Loc

Gymnochthebius australis (Blackburn)

Perkins, Philip D. 2005
2005
Loc

Ochthebius fischeri

Deane, C. 1931: 170
1931
Loc

Ochthebius leai

Deane, C. 1931: 171
1931
Loc

Ochthebius australis

Blackburn, T. 1888: 835
1888