Limnebius endroedyi, Perkins, Philip D., 2015

Perkins, Philip D., 2015, Taxonomy of the water beetle genus Limnebius Leach in southern Africa (Coleoptera: Hydraenidae), Zootaxa 3948 (1), pp. 41-59 : 42-44

Limnebius endroedyi , new species

Figs. 1 (habitus), 12 (aedeagus), 25 (map)

Type material. Holotype (male): Namibia: C. Namib desert, Numis Wasser, shore washing, 26° 3' S, 16° 15' E, 9 viii 1989, Endrödy-Younga & Klimaszewski (#2642) ( TMSA). A total of 4,335 additional specimens; specimens are paratypes unless otherwise noted: Namibia: Aub, 20 mi. S of Windhoek, spring and pools in sand river bed, elev. 1905 m, 22° 56' S, 17° 12' E, 18 v 1954, J. Balfour-Browne (209) (24 BMNH); C. Namib desert, Numis Wasser, shore washing, 26° 3' S, 16° 15' E, 9 viii 1989, Endrödy-Younga & Klimaszewski (#2642)(245 paratypes, 910 non-types TMSA); Damaraland, groot Barmen, shore washing, 22° 5' S, 16° 40' E, 12 ix 1975, Endrödy- Younga (#370) (8 TMSA); Gt. Namaqualand, Frm Kub Süd, Fish R., shore washing, 24° 14' S, 17° 30' E, 2 viii 1981, Endrödy-Younga (#1819) (130 TMSA); Khomashochl., Farm Wissenfels, shore washing, 23° 20' S, 16° 25' E, 14 ix 1974, Endrödy-Younga (#371) (140 TMSA); Koriankab Waterhole, 10 mi. WNW Windhoek, Bare sand and gravel shores, elev. 1676 m, 22° 30' S, 16° 56' E, 19 v 1954, J. Balfour-Browne (212) (39 BMNH); Maltah. D., Farm Kamkas 20, shore washing, 24° 36' S, 16° 37' E, 28 x 1974, Endrödy-Younga (#435) (48 TMSA); Namib, Gobabeb, shore washing, 23° 34' S, 15° 3' E, 7 ix 1974, Endrödy-Younga (#363) (38 TMSA); Namib - Naukluft Park, Naukluft spring, spring, 24° 15' S, 16° 14' E, 28–30 xi 1997, Kirk-Spriggs & Marais (2 SMW); Naukluft cascades, cascades, 24° 16' S, 16° 15' E, 12 viii 1989, Endrödy-Younga & Klimaszewski (#2648) (2 TMSA); Naukluft, Felseneck farm, shore washing, 24° 12' S, 16° 4' E, 24 x 1974, Endrödy-Younga (#414)(38 paratypes, 800 non-types TMSA); Naukluft, Naukluft Park, shore washing, 24° 16' S, 16° 15' E, 26 x 1974, Endrödy-Younga (#431) (69 TMSA); Naukluft River, shore washing, 24° 16' S, 16° 15' E, 10 viii 1989, Endrödy-Younga & Klimaszewski (#2644)(28 paratypes, 183 non-types TMSA); Windhoek, Eros Mt., shore washing, elev. 1600 m, 22° 34' S, 17° 6' E, 10 ix 1974, Endrödy-Younga (#365) (58 TMSA); same locality, elev. 1600 m, 22° 34' S, 17° 6' E, 10 ix 1974, Endrödy-Younga (#367) (92 TMSA); Windhoek, Regenstein, ground traps for 10 days, 22° 36' S, 16° 59' E, 24 viii 1975, Endrödy-Younga (#869) (4 TMSA); Windhoek, Aris Dam, in storage dam, sandy gravel edges, little vegetation, elev. 1654 m, 22° 34' S, 17° 5' E, 17 v 1954, J. Balfour-Browne (205) (5 BMNH); Eastern Cape Province, 10 mi. N. Alice, 32° 37' S, 26° 56' E, 17 iii 1968, P. J. Spangler (16 USNM); Cape-Karroo, Wilgeboom R., Cradock, water coll., 32° 15' S, 25° 26' E, 22 ii 1978, W. Breytenbach (WB: 104,105) (3 TMSA); Freddy Van Zyl Bridge, Oorlog Spruit, spruit, elev. 1036.32 m, 30° 41' S, 25° 19' E, 25 ii 1947, J. Omer-Cooper (8 BMNH); Road between Queenstown and Lady Frere, on stones in running water in small stream, elev. 1158.24 m, 31° 54' S, 27° 40' E, 26 iii 1954, J. Balfour-Browne (97) (3 BMNH); Sundays River, near Addo, in silt at sides of river, 33° 44' S, 25° 42' E, 21 iii 1954, J. Balfour-Browne (1 BMNH); Gauteng, Suikerbosrand Rivier, near Heidelberg, fast flowing stream with gritty sand, elev. 1530 m, 26° 31' S, 28° 21' E, 8 iv 1954, J. Balfour-Browne (163) (4 BMNH); KwaZulu-Natal Province, Bergville District, Lawford’s Spruit near Bergville, shallow stream, sand and gravel on rocky bed, elev. 1295.4 m, 28° 44' S, 29° 21' E, 4 iv 1954, J. Balfour-Browne (41 BMNH); Bergville, Mkombe River, fine gravel at edges, elev. 1036 m, 28° 41' S, 29° 10' E, 6 iv 1954, J. Balfour-Browne (149) (14 BMNH); Buffalo River System (BF numbers), river, 27° 42' S, 30° 33' E, 23 iv 1974, collector unknown(1 AMG); Drake Spruit, nr. Estcourt, in side gravel of gritty stream, elev. 1220 m, 29° 17' S, 29° 30' E, 2 iv 1954, J. Balfour-Browne (135) (65 BMNH); nr. Bergville, small unnamed spruit, from fast water in gravel at edges, elev. 1188 m, 28° 44' S, 29° 21' E, 6 iv 1954, J. Balfour-Browne (1 BMNH); nr. Bergville, small unnamed spruit, in side pools among muddy stones and sand, 28° 44' S, 29° 21' E, 4 iv 1954, J. Balfour-Browne (142) (3 BMNH); Mpumalanga Province, Bundu Inn, shore washing, 25° 28' S, 28° 55' E, 24 iii 1974, Endrödy-Younga (#304) (23 TMSA); S. Transvaal, Roberts Drift, Vaal R., sifted flood debris, 27° 2' S, 29° 2' E, 8 x 1973, Endrödy- Younga (#190) (32 TMSA); Vaal River where crossed by road from Morgenzon to Amersfoort, VAL Stn. 3, river, 26° 51' S, 29° 42' E ,, collector unknown(1 AMG); Western Cape Province, 22 mi. N. Nelspoort, 31° 51' S, 22° 57' E, 3 iii 1968, P. J. Spangler (14 USNM); Langeberg, Ruiterbos For. St., river stones, 33° 54' S, 22° 2' E, 4 xi 1993, Endrödy-Younga (#2942) (1 TMSA); Little Karroo, Kammanasieberge, water and shore, 33° 37' S, 22° 33' E, 21 xi 1992, Endrödy-Younga (#2931) (1 TMSA); Malmesbury District, Kalabaskraal, roadside pond with much Juncus and Nitella, elev. 105 m, 33° 28' S, 18° 43' E, 27 vii 1954, J. Balfour-Browne (Stn. No. 326) (1 BMNH); Swartberg, Meiringspoort cent., shore washing, 33° 25' S, 22° 33' E, 1 xi 1993, Endrödy-Younga (#2925) (43 paratypes, 332 non-types TMSA); Swartberg, Meiringspoort, shore washing, 33° 25' S, 22° 33' E, 1 xi 1993, Endrödy-Younga (#2924) (83 paratypes, 780 non-types TMSA).

Differential diagnosis. Habitus as in Fig. 1 ; a moderately small species with elongate oval body form, nonmicroreticulate pronotal disc and weakly microreticulate elytra. The aedeagus ( Fig. 12) is slightly arcuate in both views; slightly widened basally; apex rather sharply rounded, wider in ventral than lateral aspect, with a row of short setae on each side; internal duct usually not protruded (protruded in holotype). Males can be recognized by the excavate lateral margins of the labrum.

Description. Size: holotype (length/width, mm): body (length to elytral apices) 1.03/0.49; pronotum 0.26/ 0.49; elytra 0.61/0.48; approximate height, lateral view 0.33. Dorsum brown to piceous, head and pronotum usually darker than elytra. Body form elongate oval, not drop-shaped, side margin indented slightly where pronotum joins elytra. Pronotum with disc shining, non-microreticulate, very sparsely finely punctulate, each puncture with very short adpressed seta; area posterior to eye (side view) with subserial, unilinear row of distinctly larger punctures, each puncture with adpressed seta, longer than setae on disc. Elytra very weakly microreticulate, almost obsolete, with punctures and setae similar to those on pronotum.

Males with first three pro- and mesotarsal segments slightly enlarged, with adhesive setae. Labroclypeal suture bisinuate in frontal view in both sexes. Labrum of male with anterior margin slightly thickened over median ½, lateral area on each side excavate ( Fig. 1 ); labrum of female simple. Elytral apices slightly more widely rounded in males than in females.

Etymology. Named in honor of Sebastian Endrödy-Younga.

Distribution. Widely but rather sparsely distributed in southern and eastern South Africa, with a disjunct population in Namibia ( Fig. 25).

Figures

FIGURES 1 – 4. Dorsal and lateral habitus views of holotypes.