Podaena latipalpis 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 : 39-41

Podaena latipalpis Ordish, 1984

( Figs 7, 8, 9, 10 , 42, 46 , 57 , 97 , 108 )

Podaena latipalpis Ordish, 1984: 15 , figs 2, 12, 29, 56, 83, 112.

Podaena latipalpis ; Delgado & Palma, 2004: 328, figs 1–20. Larval morphology.

Differential diagnosis. Male ( Fig. 108 ) body length (taken from anterior margin of labrum to elytral apex) 1.90 mm; female body length 1.95 mm. The male maxillary palps are modified ( Figs 7−10 ). The third (penultimate) palpomere has a conspicuous groove with wide lateral expansions ( Fig. 8, 10 ), appearing approximately round in its ventral view ( Figs 7, 9 ); the fourth (distal) palpomere also has a groove, and is dorso-ventrally flattened, with a foliaceous appearance ( Figs 8, 10 ). There is a degree of intraspecific variation in the expansion of the male palps of this species, with the widest distal palpomeres present in the southern populations ( Figs 7−8 ).

The male foretibiae are modified ( Figs 42, 46 ) and, as with the palps, there is some geographic intraspecific variation in the thickness and length of the setae associated with the distal expansion (thinner and longer in the southern populations) and in the depth of the mid invagination (shallower in the southern populations). The metaventral glabrous central area of P. latipalpis is as in Fig. 47 , and similar to that in the other species of the complex as well as in P. dentipalpis , P. obscura and P. kuscheli . Neither the terminalia in both sexes (as in Figs 54, 57 , 63, 65, 68 ) nor the male genitalia (as in Figs 75−76 and 79−82 ) are useful to separate P. latipalpis from similar species.

The highly modified male maxillary palps ( Figs 7−10 ) clearly separate P. latipalpis from species with not modified palps, i.e. P. aotea , P. glabriventris , P. maclellani , P. kuscheli and P. mariae . The male foretibiae ( Figs 42, 46 ) and the male genitalia further separate P. latipalpis from P. glabriventris , P. maclellani and P. mariae , while the distance between tibial spines 1 and 2 further separate P. latipalpis from P. kuscheli ( Figs 35 , 46 ). Furthermore, the male maxillary palps of P. latipalpis are also different from those of P. dentipalpis ( Figs 15−16 ) and P. trochanteralis ( Figs 17−18 ), but the shape and chaetotaxy of the male foretibiae, especially on the anterior view, are even more diagnostic among these species (compare Figs 32, 34 with Fig. 42 ).

The male maxillary palps of P. latipalpis are similar to those of P. obscura ( Figs 11−14 ), P. moanaiti ( Figs 3−4 ) and P. hauturu ( Figs 5−6 ). However, P. latipalpis can be clearly separated from P. obscura by the male foretibiae ( Figs 33 , 42 ). Further, both the much longer setae of the second palpomere in the palps of P. moanaiti , ( Figs 3−4 ) as well as its narrower third (penultimate) palpomere allow separation of this species from P. latipalpis . The closest species to P. latipalpis is P. hauturu , but the third (penultimate) palpomere is wider and more round in P. latipalpis , while the fourth (distal) palpomere is clearly shorter in P. latipalpis ( Figs 5, 7, 9 ). Additional characters to distinguish P. latipalpis from P. hauturu are the shape and chaetotaxy of the male foretibiae, especially in the distal half, best seen on the anterior view ( Figs 40, 42 ).

Distribution. As in Fig. 97 . Distributed throughout the north, west and south of the North Island, and in the north of the South Island. Recorded from Wellington (WN) and Nelson (NN) for the first time in this paper.

Material examined. Type material. Holotype: North Island : Northland ( ND): Male – “Mangamuka Gorge / 4 May 74. / G. Kuschel ”.

Paratypes: North Island : Northland ( ND) : 12 males 3 females (in alcohol) ( NZAC) : “NEW ZEALAND ND Mangamuka Saddle / 22 Sep 1976 G. Kuschel / litter in bush stream” . 3 males, 1 female (in alcohol) ( NZAC) : “ Mangamuka / Saddle , / 22.9.76 G.K.” . 3 males (dry-mounted: printed labels) ( NZAC) : “ Mangamuka gorg. / 9 May 74. / G. Kuschel ” . 1 male (dry-mounted) ( NZAC) : “ Waiomio Cave stm / Northland / 1.5.75 G. Kuschel ”. Auckland ( AK) : 2 males, 4 females (in alcohol) ( NZAC) : “ Karamatura Valley / Huia. 29 May 1973 / B.M. May. 2 males (dry-mounted) ( MONZ): “ Karamatura Valley / Huia 29.5.73 / B.M. May ” . 1 male, 2 females (in alcohol) ( NZAC) : “Mangatawhiri V. / Hunua Ra., Auckl. / 12 Jun 1973 / B males May” . 1 female (dry-mounted) ( NZAC) : “ Kohukohunui / Hunua 30 Mar 74 / W.C. Watt. 600 m ” . 4 females (in alcohol) ( NZAC) : “ Fairy Falls stream / and Tributaries / Henderson Valley / 24 May” 1973. B.M. May . 4 males (in alcohol) ( NZAC) : “ Caskade / Waitaker / 19.1.75, G. Kuschel ” . 2 males, 7 females (in alcohol) ( NZAC) : “ Kitekite Stm / Piha, AK / 8 Oct 1973 / G. Kuschel ” . 2 males (1 male in alcohol, 1 male dry-mounted: printed label) ( MONZ) : ”Genus III / Hydraenidae . / Upper Cascade stm / 23.1.74”. Coromandel ( CL) : 34 males, 32 females (31 males in alcohol, 3 males dry-mounted: printed labels, 30 females in alcohol, 2 females dry mounted: printed labels) ( NZAC) : “NEW ZEALAND CL Little Barrier I / Awaroa Stream Mar 1974 / J.S. Dugdale ex stream bed on / leaves in water”, “duplicate specimens mounted” . 9 males, 11 females (in alcohol) ( NZAC) : “ Waiau Falls / 150 m., 25.1.74 / Coromandel / G. Kuschel ” . 2 males (dry-mounted) ( NZAC) : “ Waiau Falls / Coromandel / 150 m., 25.1.74 / G. Kuschel ” . 1 male, 1 female (drymounted: printed labels) ( NZAC) : “ Waiau Falls / Coromandel, 150 m. / 25.1.74, G. Kuschel ”. Waikato ( WO) : 1 male, 2 females (1 male dry-mounted, 1 female in alcohol, 1 female dry-mounted) ( NZAC) : “ Mangapohue Stm / Waitomo 12.3.75 / G. Kuschel ” . 4 males, 3 females (3 males in alcohol, 1 male dry mounted, 3 females in alcohol) ( NZAC) : “Mangapohue strm / Waitomo / 18 Mar 1975 / G. Kuschel”, “Grid ref. / N82−469843”. Wairarapa ( WA) : 1 male, 1 female (1 male dry-mounted: printed label, 1 female in alcohol) ( MONZ) : “ 25.10.1965 / MARINE DEPARTMENT No. / Coleoptera / Hinau stm., south branch. / Limnacrene. / Carrington, Wairarapa”, “ C.L. Hopkins / Fish. Res. Divn” (partially printed) .

Additional material examined. North Island : Northland ( ND) : 8 males, 10 females (in alcohol) ( NZAC) : “ Mangamuka gorg. / 9. May 74. / G. Kuschel ” [surplus to the number of paratypes listed by Ordish 1984: 16. See Table 1]. 14 males, 19 females (in alcohol) ( NZAC) : “ Mangamuka gorge / 9. May 1974 / G. Kuschel ”, “See Slide”. Male legs and head parts (1 microslide) ( MONZ) : “ Mangamuka gorge / 9. May 1974 / G. Kuschel ” . 1 male, 1 female (in alcohol) ( MONZ) : “ Mangamuka Saddle / ND. N.Z / 22. Sept. 1976 / G. Kuschel ” . 1 male (without head, dry-mounted), 1 female (dry-mounted: partially printed) ( MONZ) : “ Mangamuka Gorge / Auckland / 9 May 74 / G. Kuschel ”. 1 female (dry-mounted) ( NZAC) : “ Mangamuka / Gge., 9 May 74 / G. Kuschel ”, “10. segm−” . 1 male (dry-mounted) ( NMWA) : “ NEW ZEALAND: N− Isl. ND / Mangataniwha Range / 6 km N Mangamuka. 400m / 18.2.1997 leg. Schuh. Auckland ( AK): 1 male, 1 female (dry-mounted) ( NZAC): “ Fairy Falls / Henderson / 24 May 73 / B.M. May ” . 6 males, 5 females (in alcohol) ( NZAC) : “ Tributary streams / Huia Valley / Auckland 23 June 1973 / B.M. May ” . 3 females (in alcohol) ( NZAC) : “ Bush stream / Mahurangi R. drainage / ca 60 km N. of Auckland / 15 August 1973. B.M. May ”. Coromandel ( CL) : 20 males, 14 females (in alcohol) ( NZAC) : “ Square Kauri / Tapu Saddle / Coromandel ”, “26 Jan 74 / G. Kuschel / bush stream”. Taranaki ( TK) : 1 male (dry-mounted: partially printed) ( NZAC) : “ New Zealand TK / Holly Hut 950 m. / North Egmont / 27 Nov 1975, A.K. Walker ” . 6 males, 3 females (dry-mounted: partially printed) ( NZAC) : “ New Zealand TK / Pouakai Ra / 1280m / 2 Dec 1975 / A.K. Walker ” . 1 male, 1 female (dry-mounted) ( NZAC) : “ New Zealand TK / Tributary of / Kaupohonui / 518 m. 9 Nov 74 / K.J. Fox ”. Wellington ( WN) : 2 males, 2 females (dry-mounted: printed labels) ( MONZ) : “ NEW ZEALAND, WD / Karori Reservoir / 26 February 1996 / J. Nunn ” . 2 males (dry mounted: printed labels) ( CDMS) : “ Stream in Karori Reservoir / Wellington. NEW ZEALAND / 10.11−96. Mud and leaves / J.A. Delgado leg” . 1 male (dry mounted) ( CDMS) : “Karori / 13−nov−96 / Delgado leg.”. South Island : Nelson ( NN) : 3 males, 1 female (dry mounted: printed labels) ( CDMS) : “ Norris Creek / Golden Downs , Nelson / N.Z. Delgado leg / 1−12−1996 ” .

Figures

FIGURE 108. Habitus of P. latipalpis (Little Barrier Island). 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 39−46. Male left foretibiae. 39, P. aotea (anterior view). 40, P. hauturu (anterior view). 41, P. moanaiti (anterior view). 42, P. latipalpis (anterior view, Waitomo). 43, P.aotea(lateral view). 44, P. hauturu (lateral view). 45, P. moanaiti (lateral view). 46, P. latipalpis (lateral view, Waitomo). 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 95−98. Distribution maps for all species of Podaena. New Zealand is subdivided in areas as proposed by Crosby et al. (1976, 1998).

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 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 75−78. Male genitalia. 75, P. obscura (lateral view, Rahu Creek). 76, P. obscura (ventral view, Rahu Creek). 77, P. trochanteralis (lateral view, Lewis Pass). 78, P. trochanteralis (ventral view, Lewis Pass). 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 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.