Hydraena brittoni Zwick, 1977

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: 26-27

publication ID

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

publication LSID

lsid:zoobank.org:pub:97D649AF-D141-4FBF-9729-192718525E87

DOI

http://doi.org/10.5281/zenodo.5086896

persistent identifier

http://treatment.plazi.org/id/038187DB-FFA2-FFDD-FF37-FCA5FD543248

treatment provided by

Felipe

scientific name

Hydraena brittoni Zwick, 1977
status

 

Hydraena brittoni Zwick, 1977  

( Figs. 31 View FIGURES 29–32 , 35, 36 View FIGURES 33–36 , 239)

Hydraena brittoni Zwick, 1977: 177   .

Type Material. Holotype (male): Western Australia, Millstream [ca. 21° 35' S, 117° 4' E] [labels: (21.35S 117.04E) Millstream, WA., 2.xi.70 from gravel at edge of pool at pipe crossing. E. Britton // [pink label] Holotype // Aedeagus drawn by P. D. Perkins // DIGITAL IMAGE captured 2004 P. D. Perkins // Hydraena brittoni Zwick Holo-Typus   des. P. Zwick 1977]. Deposited in the ANIC. GoogleMaps  

Differential Diagnosis. Very similar in habitus to H. simplicicollis   ( Figs. 29–31 View FIGURES 29–32 ); differing therefrom by the slightly narrower mesoventral process (compared to the plaque width), the slightly less widely separated plaques, and the slightly less coarse dorsal punctation. Reliable determinations will be based on examination of the aedeagi ( Figs. 33–36 View FIGURES 33–36 ).

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.59/0.68; head 0.24/ 0.38; pronotum 0.43/0.51, PA 0.42, PB 0.46; elytra 0.99/0.68. Head piceous, pronotum piceous on disc, dark brown anteriorly and posteriorly, elytra dark brown, legs and maxillary palpi brown, tip of last palpomere not darker.

Frons punctures ca. 1xef; interstices shining, 0.5–2xpd. Clypeus microreticulate laterally, shining and 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, 1–3xpd, punctures denser anteriorly and posteriorly, separated by narrow walls to 1xpd; PF1 and PF4 absent; PF2 very small, nearly absent; PF3 moderately deep, broad.

Elytral punctures about equal size of largest pronotal punctures. Intervals not raised, shining, width about 2xpd, as are interstices between punctures of a row. Apices in dorsal aspect conjointly rounded, in posterior aspect margins form shallow angle with one another.

Ratios of P2 width and plaque shape (P2/w/l/s) ca. 3/1/8/4. P1 laminate; median carina slightly angulate in profile. P2 moderately wide, l/w ca. 3/4, sides parallel, apex blunt. Plaques located in posterior 7/10 of metaventrite on sides of deep median triangular depression, plaques narrow, straight, converging, anterior separation ca. 1/2 posterior separation. No midlongitudinal carina between mesoventral intercoxal process and plaques. AIS flat, width at arcuate posterior margin slightly less than 2x P2. All tibiae slender, simple. Last sternite symmetrical or nearly so; last tergite with apicomedian notch.

Aedeagus ( Figs. 35, 36 View FIGURES 33–36 ) main-piece with pointed process on right side, shorter than right paramere, which is partially behind it; distal piece with several diagnostic processes; left paramere moderately wide in distal 1/ 2, setae at apex, about seven, very stout, setae along ventral margin, about five, widely spaced, long, and thin; right paramere sharpely pointed at apex, setae in row on ventral margin. Female last tergite with apicomedian incision delimiting two lobes, setae slender, tapering.

Distribution. Currently known from western Western Australia (Fig. 239).

Material Examined (89): Western Australia, 0.5 km WNW of Millstream , 21° 35' S, 117° 4' E, 7 April 1970, M. S. Upton (1 ANIC) GoogleMaps   ; 1 km N Red Hill Station , 21° 58' S, 116° 4' E, 22 May 2001, C. H. S. Watts (1 SAMA) GoogleMaps   ; 10 km NW Eerala Station , 21° 19' S, 117° 2' E, 23 May 2001, C. H. S. Watts (6 SAMA) GoogleMaps   ; Cane River, Hwy 1 crossing, 21° 58' S, 115° 35' E, 22 May 2001, C. H. S. Watts (2 SAMA) GoogleMaps   ; Millstream, Crossing pool, 21° 35' S, 117° 4' E, 24 May 2001, C. H. S. Watts (15 SAMA) GoogleMaps   ; Millstream, Crystal Pool , at light, 21° 35' S, 117° 4' E, 5 November 1970, E. B. Britton (1 ANIC) GoogleMaps   ; Millstream , gravel at water’s edge in pipe crossing pool, 21° 35' S, 117° 4' E, 2 November 1970, E. Britton (20 ANIC) GoogleMaps   ; Millstream , shallow stream, from gravel at edge of pool at pipe crossing, 21° 35' S, 117° 4' E, 2 November 1970, E. Britton (36 ANIC, 1 NMW) GoogleMaps   ; Millstream, shallow stream, gravel margins of Crossing Pool , 21° 35' S, 117° 4' E, 1 November 1970, E. Britton (2 ANIC) GoogleMaps   ; Millstream, waterside gravel in pipe Crossing Pool , 21° 35' S, 117° 4' E, 5 November 1970, E. Britton (3 ANIC) GoogleMaps   ; Woodstock Station , at UV florescent light at night 6:00 to 7:30 PM, 21° 37' S, 119° 1' E, 24 September 1988, B. P. Hanich (site WS 9) (1 WAMP) GoogleMaps   .

IMAGE

The I.M.A.G.E Consortium

ANIC

Australian National Insect Collection

SAMA

South Australia Museum

NMW

Naturhistorisches Museum, Wien

UV

Departamento de Biologia de la Universidad del Valle

PM

Pratt Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydraenidae

Genus

Hydraena

Loc

Hydraena brittoni Zwick, 1977

PERKINS, PHILIP D. 2007
2007
Loc

Hydraena brittoni Zwick, 1977: 177

Zwick, P. 1977: 177
1977