A revision of the water beetle genus Hydraena Kugelann for southern Africa (Coleoptera: Hydraenidae)
PERKINS, PHILIP D.
Zootaxa
2014
2014-01-29
3758
1
1
92
6MJ4Q
Perkins
2014
[151,396,1818,1844]
Insecta
Hydraenidae
Hydraena
Animalia
Coleoptera
30
31
Arthropoda
species
elephanta
sp. nov.
Figs. 19(habitus), 21 (aedeagus), 86 (map)
Type material. Holotype(male): Angola: Altoplano, Ongueria, in stagnant pools below waterfall, elev. 1615 m, 15° 19' S, 13° 32' E, 10 vi 1954, J. Balfour-Browne(255) ( BMNH). Paratypes(64): Angola: Samedata as holotype (1 BMNH). Senhora do Monte, Sa da Bandeira, sous des pierres, elev. 563 m, 14° 42' S, 13° 49' E, 22 ix 1949, A. de Barros Machado(61 BMNH); Serra do Moco, Luimbale, elev. 700 m, 12° 14' S, 15° 18' E, 6 ix 1949, A. de Barros Machado(1 BMNH); Namibia: Namib-NaukluftNP: Naukluft River, Phragmitesgrass + leaf litter, shore washing + sievings, 24° 15.78' S, 16° 14.08' E, 29-30 xi 1997, M. Uhlig(1 ZMHB).
Differential diagnosis.Recognized by the piceous pronotal disc, which has large and deep PF2 foveae that are shallowly confluent in the midline. Each dorsal puncture has a distinctive, short recumbent seta. The aedeagus shows some similarity to that of H. uniforma( Figs. 20, 21), but that species has non-serial elytral punctures, and the dorsal habitus of the two species differ distinctively ( Figs. 18, 19).
Description. Size: holotype(length/width, mm): body (length to elytral apices) 1.64/0.70; head 0.23/0.40; pronotum 0.42/0.52, PA 0.41, PB 0.45; elytra 1.02/0.70. Dorsum of head dark brown to piceous; pronotum brown to dark brown near margins, gradually grading to piceous on disc; elytra dark brown; legs brown; maxillary palpi light brown. Each dorsal puncture with distinctive, short recumbent seta. Frons punctures ca. 1xef, denser near eyes than medially; interstices weakly shining, 0.5–1xpd laterally, 1– 2xpd medially. Clypeus mcr laterally, very finely sparsely punctulate medially. Mentum moderately densely finely punctulate, interstices shining; postmentum contiguously punctulate. Genae raised, shining, without posterior ridge. Pronotum laterally slightly emarginate behind middle; anterior margin straight behind eyes, emarginate behind frons, scintilla absent; punctures on disc slightly larger and deeper than those of frons, interstices shining, 1–2xpd, punctures slightly denser at anterior and posterior; PF1 very shallow, confluent in midline; PF2 deep, shallowly confluent in midline; PF3 deep; PF4 shallow. Elytra weakly arcuate laterally; summit of posterior declivity at ca. midlength; lateral explanate margin moderately wide; on basal 1/3 punctures ca. 1–2xpd largest pronotal punctures, punctures becoming finer and more widely spaced toward posterior. Intervals not raised, shining, on basal 1/3 ca. 1xpd, as are interstices between punctures of a row. Apices in dorsal aspect conjointly rounded, in posterior aspect margins forming shallow angle with one another. Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1/4/5. P1 laminate; median carina sinuate in profile. P2 l/ w ca. 3/1, sides slightly diverging toward blunt apex, apex raised slightly above mesoventral intercoxal process. Plaques small, elongate oval, parallel, very weakly raised, located at sides of moderately deep median depression. Metaventrite without midlongitudinal carina between intercoxal process and median depression. AIS width at slightly arcuate posterior margin ca. 2x P2. All tibiae slender, pro- and metatibiae very slightly arcuate, mesotibiae straight. Abdominal apex symmetrical; last tergite with apicomedian notch. Female (microslide mount, n=1): last tergite moderately broadly rounded, with minute apicomedian notch, ca. 28 hooked setae in double row; gonocoxite not midlongitudinally divided, apical margin moderately broadly rounded, low transverse ridge evident at border of microreticulation; spermatheca simple, typeC shape.
Etymology.Named in reference to the elephant-like shape of the aedeagal apex.
Distribution.Currently known from Angolaand Namibia( Fig. 86).
3311567597
1954-06-10
BMNH
J. Balfour-Browne
Angola
1615
-15.316667
Altoplano
1285
13.533334
Ongueria
30
31
1
holotype
3311567376
1954-06-10
BMNH
Same
Angola
1615
-15.316667
Altoplano
1285
13.533334
Ongueria
30
31
1
paratype
3311567481
1949-09-22
BMNH
A. de Barros Machado
Angola
563
31
32
-14.7
Senhora do Monte
1287
13.816667
Sa da Bandeira
30
31
1
paratype
3311567559
1949-09-06
BMNH
A. de Barros Machado
Angola
700
-12.233334
Serra do Moco
1293
15.3
Luimbale
31
32
1
paratype
3311567304
1997-11-29
1997-11-30
1997-11-29
ZMHB
M. Uhlig
Namibia
Phragmites
-24.263
Namib-Naukluft
12
16.234667
Naukluft River
31
32
1
paratype