Podaena dentipalpis 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 : 18-20

Podaena dentipalpis Ordish, 1984

( Figs 15, 16 , 34, 38 , 79, 80 , 88, 89 , 96 , 99 )

Podaena dentipalpis Ordish, 1984: 14 , figs 18, 26, 54, 80, 109.

Differential diagnosis. Male ( Fig. 99 ) body length (taken from anterior margin of labrum to elytral apex) 1.85 mm; female body length 1.95 mm. Males are distinguished from those of all other species by the palp having a small distal groove on the third (penultimate) palpomere ( Figs 15−16 ), associated with a toothshaped expansion best seen on the lateroventral view ( Fig. 16 ). The second palpomere has rows of long setae similar to those of P. moanaiti ( Figs 3−4 ), but in the latter species there is no tooth-shaped expansion. The male foretibiae are short and wide, with a marked lateral expansion and a reduced constriction of the distal half ( Fig. 34 ) and tibial spines inserted very close together ( Fig. 38 ). The male foretibiae of P. dentipalpis are closest to those of P. obscura and P. trochanteralis ( Figs 32−34, 36−38 ), but there are subtle differences that may assist in their separation. Male genitalia ( Figs 79−80 ) with more than the distal half of the main piece and the distal lobe very unsclerotized, transparent and with a variable morphology. Very similar to the genitalia of P. obscura , P. kuscheli and species of the P. latipalpis complex. Females very close and difficult to separate from those of these latter species. With the exception of P. kuscheli , the spermatheca of P. dentipalpis ( Figs 88−89 ) is morphologically indistinguishable from the spermatheca of those species.

Note. The left foreleg of P. dentipalpis was figured by Ordish (1984: 44, fig. 54) in its posterior aspect, not “anterior as stated in the legend to his figs 54−66 ( Ordish 1984: 45).

Distribution. As in Fig. 96 . Widely distributed over the South Island, where it is one the most frequently collected species. In this paper, we report new records for Mid Canterbury (MC), Mackenzie (MK) and South Canterbury (SC).

Material examined. Type material. Holotype: South Island : Nelson ( NN): Male – “The Brook NN / 11 Feb. 73 / G. Kuschel ”.

Paratypes: South Island : Nelson ( NN) : 4 males, 3 females (in alcohol) ( NZAC) : “Maitai V., NN. / Small stm at / S20 686 261 / 25.11.72 G.K.”. 4 males, 2 females (in alcohol) ( NZAC) : “ Maitai V. NN. / small stm at / S20 681 262 G.K. / 25.Nov 1972 ” . 21 males, 13 females (21 males in alcohol, 12 females in alcohol, 1 female dry-mounted: label printed) ( NZAC) : “Maitai V. / Lower Sanders CK. / 18.4.73. G.K.”. 1 elytron (in alcohol) ( NZAC) : “ Maitai cave / 18 Apr 73” . 5 males, 4 females (in alcohol) ( NZAC) : “Maitai V, S. arm / Upper Sanders CK / 18.4.73, G.K.” . 2 males, 1 female (in alcohol) ( NZAC) : “Maitai V. NN / 2nd Stream, 16 Dec. 72 G.K.”. 7 males, 13 females (in alcohol) ( NZAC) : “Maitai V. NN / 2nd stream / 27 Jan 73, G.K.”. 15 males 7 females (in alcohol) ( NZAC) : “Maitai V. NN / 2nd small str. / 10 Dec 1972, G. Kuschel” . 1 male, 9 females (in alcohol) ( NZAC) : “Maitai V. NN. / 10. Dec. 72 / Stm at care Taker’s. / G. Kuschel ” . 1 male (drymounted) ( MONZ) : “Maitai V. NN /10.12.72, G. Kuschel”. 1 female (dry-mounted) ( NZAC) : “Maitai V. NN / 10 Dec 1972, G.K. / at Caretakers” . 2 males, 3 females (in alcohol) ( MONZ) : “Maitai Va. 4.ii.78”. 7 males, 11 females (in alcohol) ( NZAC) : “Anised V. Nelson. 21. Feb 73 / Small stream at Dam site”. 8 males, 10 females (in alcohol) ( NZAC) : “Nr. Opossum CK NN / Teal V. / 15. Dec 72, G.K.”. 1 male, 1 female (drymounted) ( NZAC) : “Opossum Ck. NN / Teal V. / 15 Dec. 72, G.K.”. 2 males, 4 females (in alcohol) ( NZAC) : “ Dobson’s Valley stm. / Atawhai , Nelson / under broadleaf forest / 5.5.73 J.S. Dugdale ”. 44 males, 36 females (in alcohol) ( NZAC) : “Marsden V. / NN. 28.1.73 / G.K. in bush”. 3 males, 4 females (in alcohol) ( NZAC) : “Gilbert CK, Hope NN. / S26 224 926 / 23.5.73 under beech. / F. Greenough ” . 1 male, 2 females (in alcohol) ( NZAC) : “ Dun Mtn 750 m. / 6 Feb 73, G.K. / small stream / in bush” . 10 males, 10 females (in alcohol) ( NZAC) : “The Brook, NN / 11 Feb 73 / G Kuschel”. 17 males, 19 females (in alcohol) ( NZAC) : “The Brook, NN / 11.Feb.73 G.K.”. 10 males, 10 females (in alcohol) ( NZAC) : “The Brook NN / 11.2.73 G.K.”. 1 male, 1 female (dry-mounted: partially printed) ( MONZ) : “The Brook, / Nelson NZ / 11.2.73 G. Kuschel ” . 1 male (dry-mounted) ( MONZ) : “ The Brook , Nelson / 11.Feb.1973 / G. Kuschel” . 117 males, 57 females (in alcohol) ( NZAC) : “The Brook, NN / 11.2.73 G.K.”, “See Slide”. 28 males 11 females (in alcohol) ( NZAC) : “The Brook, NN / 3.2.73. / G. Kuschel”. 1 male (in alcohol) ( NZAC) : “Sandy CK, nr Kaiwatiri, in bush Granite bed / 11ºC 5.1.73 G.K.”. Marlborough Sounds (SD): 3 males, 4 females (in alcohol) ( NZAC) : “ Ship Cove , 150m. / at S16| 509 482 / 30 Nov 1972, G.K.” . 1 male, 4 females (in alcohol) ( NZAC) : “ Ship Cove , 300 m. up / stream, S16| 509488 / 1 Dec 1972, G.K.” . 10 males, 6 females (in alcohol) ( NZAC) : “ Ship Cove / main strm. / 15 Feb 1973, G.K.” . 14 males, 15 females (in alcohol) ( NZAC) : “Tuamarina Marlb. / 21.2.73 J.McB. / S22 305155, Pukaka stm. ”. 47 males, 46 females (in alcohol) ( NZAC) : “ Picton | Marlborough / 21.2.73 S22 / 310228 J.McB.”. 1 male, 3 females (in alcohol) ( NZAC) : “Pelorus 21.2.73 / S21 877 254, Shingle CK in bush / J.McBurney ” . 48 males, 54 females (in alcohol) ( NZAC) : “ Shakespeare Bay , Picton 21.Feb.73 / J.McBurney S22|283|275 Slow / running small creek in bush” . 38 males, 45 females (in alcohol) ( NZAC) : “Havelock 21.2.73 J.McB. / S21 073276 Stoney CK / in bush” . 2 females (in alcohol) ( MONZ) : “Waitohi R., Picton E. / 25.5.75 R.G. Ordish ”. Marlborough ( MB) : 1 male (in alcohol) ( NZAC) : “Blue Duck V., Kaikouras, 19.3.73 G.K.”. 7 males, 7 females (in alcohol) ( NZAC) : “p4 Blue Duck V. / Kaikouras / 19.3.73 G.K.”. 1 male (dry-mounted) ( MONZ) : “Blue Duck V., / Kaikouras, 19.3.73 G.K.”. 10 males, 4 females (in alcohol) ( NZAC) : “ Dog Stream, Hanmer 500 m. 12.4.73, G.K. + J.McB. ”. Buller ( BR) : 1 male, 3 females (in alcohol) ( NZAC) : “ L. Rotoiti, small Strm / 5 Jan 73, G. Kuschel / in bush, stony bed”. Kaikoura (KA) : 20 males, 19 females (in alcohol) ( NZAC) : “ Fuschia CK. 480m / Awatere V. MB / 13.4.73 G.K. J.McB. ” . 71 males, 64 females (69 males in alcohol, 2 males dry-mounted: labels printed, 62 females in alcohol, 2 females dry-mounted: labels printed) ( MONZ) : “ Hawk. Ra. East / on road 300 m. / 12.4.73 G.K. and J.McB. ”. Mid Canterbury ( MC) : 1 male (in alcohol) ( NZAC) : “McClennans / mt Hutt. 11. Dec. 73 / Bush stream. G. K.” . 1 male, 4 females (in alcohol) ( NZAC) : “ N of Mc Clennans / Mt Hutt , 10 Dec 73 / bush stream, G. Kuschel ”. Otago lakes (OL) : 5 males, 6 females (in alcohol) ( NZAC) : “Dinner CK, L / Hawea / 29 Mar 73, G.K.”. Dunedin ( DN) : 2 males (in alcohol) ( NZAC) : “ Waipori Falls / 24.3.73 G.K.” . 27 males 18 females (in alcohol) ( NZAC) : “Leith V. / Dunedin / 23 Mar 1973 / G.K. + J.McB” .

Additional material examined. South Island: Nelson ( NN): 3 males, 3 females (in alcohol) ( NZAC): “The Brook, NN / 11.2.73 G.K.”. 1 male (dry-mounted without male genitalia) ( MONZ): “Maitai V., NN / 2nd stream / 16 Dec. 72. G.K.”. 8 males, 4 females (in alcohol) ( NZAC): “Opossum CK, NN / Teal V. / 15 Dec 1972, G.K.”. 1 male (dry-mounted) ( MONZ): “ HYDRAENIDAE / Maitai Va. 4.ii.1978 ”. 2 females (dry-mounted: printed label) ( NZAC): “Maitai V. S. arm / upper Sanders CK. / 18.Apr.1973 G.K.”, “see slide”. 3 males, 3 females (dry mounted: printed labels) ( CDMS): “ Stream in Higgins Road / Nelson to Buller / NEW ZEALAND / 1−12−96 4SB / Beech forest . J.A. Delgado leg” . Marlborough Sounds (SD): 1 male (dry-mounted: printed label) ( NZAC): “Havelock 21 Feb 73 / J.McBurney / S21| 073| 246 slow / running stony creek in bush” . Marlborough ( MB): 2 males, 3 females (1 male in alcohol, 1 male dry-mounted: printed label, 2 females in alcohol, 1 female dry-mounted: printed label) ( MONZ): “ Hanmer / 15.vi.1984 / R.L.C. Pilgrim ”. 2 males, 4 females (2 males dry-mounted: printed labels, 3 females in alcohol, 1 female dry mounted: printed label) ( MONZ): “ WHARFEDALE 6 .ii.74 / HYDRAENIDAE / Det. C. Pettigrew ”. Buller ( BR): 1 female (in alcohol) ( NZAC): “Redman’s CK Capleston. / Dead leaves in shaded / channel 2.4.73 / J.S. Dugdale ”. Mid Canterbury ( MC): 3 males, 5 females (dry-mounted: printed labels) ( CDMS): “ Stream near Greyne’s falt Arthur’s / Pass. Mid Canterbury / NEW ZEALAND 9−12−96 21−S / Beech forest . J.A. Delgado leg”. 4 males, 9 females (3 males in alcohol, 1 male dry-mounted: printed label, 8 females in alcohol, 1 female dry-mounted: printed label) ( MONZ): “CASS. 17.ii.69. / Hydraenidae / det. S. Herron ”. Mackenzie ( MK): 1 female (dry-mounted) ( NZAC): “Black Birch / strm. 450 m., MK / Hooker Valley / 2 Apr 1977 / J S Dugdale”. South Canterbury (SC): 2 females (in alcohol: printed label) ( SMDG): “New Zealand SC Waimate / The Hunter Mts. Gunns Bush / stream 210− 290 m. / S 44º48’21’’ E 172º50’53’’ / Leg. Jäger 29.01.2008 ”. Dunedin ( DN): 2 males (in alcohol) ( NZAC): “Leith Valley. DN. / 25. mar.73 / G.K. + J.McB” .

Note. As shown in Table 1, a comparison of paratype numbers given by Ordish (1984: 14) and our counting of the material available shows that there is a surplus of 6 paratypes of P. dentipalpis . However, this surplus is the balance between the totals, regardless of greater discrepancies among the numbers of males and females (see Table 1).

Figures

FIGURE 99. Habitus of P. dentipalpis (Marsden Valley). 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 31−38. Male left foretibiae. 31, P. kuscheli (anterior view, Hercules Creek). 32, P. trochanteralis (anterior view, Lake Paringa). 33, P. obscura (anterior view, Rahu Saddle). 34, P. dentipalpis (anterior view, Wharfedale). 35, P. kuscheli (lateral view, Hercules Creek). 36, P. trochanteralis (lateral view, Lake Paringa). 37, P. obscura (lateral view, Rahu Saddle). 38, P. dentipalpis (lateral view, Wharfedale). Scale = 0.1 mm.

FIGURES 79−82. Male genitalia. 79, P. dentipalpis (lateral view, Waikawa). 80, P. dentipalpis (ventral view, Waikawa). 81, P. kuscheli (lateral view, Rata Creek). 82, P. kuscheli (ventral view, Rata Creek). Scale = 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).