Podaena glabriventris Ordish, 1984

Delgado, Juan A. & Palma, Ricardo L., 2010, A revision of the genus Podaena Ordish (Insecta: Coleoptera: Hydraenidae), Zootaxa 2678 (1), pp. 1-47 : 21

Podaena glabriventris Ordish, 1984

( Figs 24 , 29, 30 , 48 , 52, 56 , 66, 67 , 73, 74 , 83, 84 , 98 , 100 )

Podaena glabriventris Ordish, 1984: 14 , figs 7, 19, 27, 81, 110.

Differential diagnosis. Male ( Fig. 100 ) body length (taken from anterior margin of labrum to elytral apex) 1.75 mm; female body length 1.80 mm. A small species, short and wide in habitus and with short legs. Externally similar to P. maclellani , with both species having unmodified male palps, only different in length ( Figs 23–24 ), slightly modified male foretibiae ( Figs 25–26, 29–30 ) and round elytra. However, P. glabriventris has a smaller body as well as shorter legs and elytra than P. maclellani . Also, P. kuscheli has similar male palps to those of P. glabriventris but their very distinct foretibiae ( Figs 29–32 ) clearly separates these two species externally. That superficial similarity with P. maclellani contrasts with all the other features that unequivocally distinguish P. glabriventris from all species of Podaena : a unique, large and semicircular, glabrous central area in the metaventrite ( Fig. 48 ); a unique last abdominal male tergite ( Fig. 52 ); a small male ventrite 7 with the shortest spiculum ( Fig. 56 ); a uniquely wide last abdominal female tergite with characteristic chaetotaxy ( Fig. 66 ); and a gonocoxite with a convex distal margin ( Fig. 67 ). The male genitalia ( Figs 73−74 ) are also diagnostic, highly sclerotized, with a cylindrical and slightly curved main piece ending in a wider tapering apex. Distal lobe short and wide, cylindrical and well sclerotized. Parameres inserted near the phallobase, with distal setae distributed over a third of their length. The ejaculatory pump and the flagellum are apparently absent. The spermatheca of P. glabriventris is, without doubt, the most characteristic among all species of Podaena , with a corrugated proximal sac, a long, straight and lighter central piece, and a sclerotized, ringed distal duct ( Figs 83−84 ).

Distribution. As in Fig. 98 . Until now, only known from three localities in the North Island, but we report new records from Taupo (TO) in the North Island, as well as Nelson (NN) and Marlborough (MB) in the South Island.

Material examined. Type material. Holotype: North Island : Wellington ( WN): Male – “Ohau R. / nr Ohau Gorge / Manawatu / 12 Jan 73 / R.G. Ordish ”.

Paratypes: North Island: Coromandel (CL) : 3 males (partially slide-mounted) ( MONZ) : “Gt Barrier Id. / Trib. Kaitoke stm. / 8.1.74 R.G. Ordish ” [1 female missing according to LCD. See Table 1]. Wellington ( WN) : 2 females (dry-mounted: 1 printed label) ( NZAC) : “MAUNGAKOTUKUTUKU / VALLEY, WELLINGTON / PROVINCE. / 27.1.1973 / R.G. Ordish ” . 1 male, 1 female (dry-mounted) ( NZAC) : “Maungakotu− / kutuku V / Wellington P. / 29 Jan 1973 ”, “ R.G. Ordish ” [correct date “27.1.73”] [1 female missing according to LCD. See Table 1] . 1 male (dry-mounted: partially printed) ( MONZ) : “MAUNGAKOTUKUTUKU / VALLEY, WELLINGTON / PROVINCE. 27.1.73. R.G.O.” 1 female (in alcohol) ( NZAC) : “Ohau R nr Ohau gorge. / Manawatu 12.1.73 / R.G. Ordish ” . 1 male (in alcohol) ( NZAC) : “ Akatarawa R. / 20.1.1973 / R.G. Ordish ” .

Additional material examined. North Island: Taupo (TO): 1 male (dry-mounted) ( NMWA) : “ NEW ZEALAND: N− Isl. TO / Kaimanawa Forest Park / Waikoko Stream 600 m / 10 km S Rangipo / 23.1.1997 Schuh & Lang”. South Island : Nelson ( NN) : 1 male (dry-mounted: printed label) ( NZAC) : “Anatoki R., Takaka / 16 Jan 73 G.K. / in small bush stream”. Marlborough ( MB) : 1 male, 3 females (dry-mounted: 1 printed label) ( NZAC) : “Tuamarina, MB / Pukaka stream / S22|305|155 / 21 Feb 73, J.McB.” .

Figures

FIGURE 100. Habitus of P. glabriventris (Flora Hut). Scale = 0.5 mm.

FIGURES 1−24. Male right maxillary palps in ventral and lateroventral views. 1, P. aotea (ventral view). 2, P. aotea (lateroventral view). 3, P. moanaiti (ventral view). 4, P. moanaiti (lateroventral view). 5, P. hauturu (ventral view). 6, P. hauturu (lateroventral view). 7, P. latipalpis (ventral view, Karori). 8, P. latipalpis (lateroventral view, Karori). 9, P. latipalpis (ventral view, Mangamuka Gorge). 10, P. latipalpis (lateroventral view, Mangamuka Gorge). 11, P. obscura (ventral view, Rahu Creek). 12, P. obscura (lateroventral view, Rahu Creek). 13, P. obscura (ventral view, Karamea Bluff). 14, P. obscura (lateroventral view, Karamea Bluff). 15, P. dentipalpis (ventral view, Maitai Valley). 16, P. dentipalpis (lateroventral view, Maitai Valley). 17, P. trochanteralis (ventral view, Rahu Creek). 18, P. trochanteralis (lateroventral view, Rahu Creek). 19, P. mariae (ventral view, stream near Fox Glacier). 20, P. mariae (lateroventral view, stream near Fox Glacier). 21, P. kuscheli (ventral view, Hercules Creek). 22, P. kuscheli (lateroventral view, Hercules Creek). 23, P. maclellani (lateroventral view, Maitai valley). 24, P. glabriventris (lateroventral view, Maungakotukutuku). Scale = 0.2 mm.

FIGURES 25−30. Male left foretibiae. 25, P. maclellani (anterior view, Dodson’s Valley). 26, P. maclellani (lateral view, Dodson’s Valley). 27, P. mariae (anterior view, stream near Fox Glacier). 28, P. mariae (lateral view, stream near Fox Glacier). 29, P. glabriventris (anterior view, Maungakotukutuku). 30, P. glabriventris (lateral view, Maungakotukutuku). Scale = 0.1 mm.

FIGURES 47−51. Metaventrites. 47, P. obscura (Rahu Creek). 48, P. glabriventris (Tuamarina). 49, P.mariae (stream near Fox Glacier). 50, P. maclellani (Dodson’s Valley). 51, P. trochanteralis (Lake Paringa). Scale = 0.1 mm.

FIGURES 52−60. Last abdominal male tergites: 52−55. 52, P. glabriventris (Maungakotukutuku). 53, P. maclellani (Shakespeare Bay). 54, P. kuscheli (Mount Hercules). 55, P. mariae (stream near Fox Glacier). Male ventrite 7 and spiculum: 56−60. 56, P. glabriventris. 57, P. latipalpis (Waiomio Cave). 58, P. maclellani (Rata Creek). 59, P.mariae (stream near Fox Glacier). 60, P. trochanteralis (Lewis Pass). Scale = 0.1 mm.

FIGURES 61−68. 61, female valvifers, gonocoxite and last two abdominal tergites of P. maclellani (Ship Cove). 63, ditto of P. trochanteralis (Altimarloch). 62, last female tergite of P. maclellani (Ship Cove). 65, ditto of P.obscura (Flora Hutt). 66, ditto of P. glabriventris (Tuamarina). 64, gonocoxite of P. maclellani (Ship Cove). 67, ditto of P. glabriventris (Tuamarina). 68, ditto of P.obscura (Flora Hutt). Scale = 0.1 mm.

FIGURES 69−74. Male genitalia. 69, P.mariae (lateral view, Mount Cook). 70, P. mariae (ventral view, Mount Cook). 71, P. maclellani (lateral view, Ship Cove). 72, P. maclellani (ventral view, Ship Cove). 73, P. glabriventris (lateral view, Maungakotukutuku). 74, P. glabriventris (ventral view, Maungakotukutuku). Scales = 0.1 mm.

FIGURES 83−94. Spermathecae: 83̅92. 83, P. glabriventris (ventral view, Tuamarina). 84, P. glabriventris (right lateral view, Tuamarina). 85, P. maclellani (ventral view, Ship Cove). 86, P. maclellani (right lateral view, Ship Cove). 87, P. kuscheli (ventral view, Hercules Creek). 88, P. dentipalpis (ventral view, Serpentine Creek). 89, P. dentipalpis (right lateral view, Serpentine Creek). 90 P. trochanteralis (ventral view, Altimarloch). 91, P. trochanteralis (right lateral view, Altimarloch). 92, P. obscura (ventral view, Flora Hutt). Distal outline of elytra: 93–94. 93, P. obscura (Gorge Creek). 94, P. moanaiti. Scales = 0.1 mm.

FIGURES 95−98. Distribution maps for all species of Podaena. New Zealand is subdivided in areas as proposed by Crosby et al. (1976, 1998).