Podaena trochanteralis 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 : 32-33

Podaena trochanteralis Ordish, 1984

( Figs 17, 18 , 32, 36 , 51 , 60 , 63 , 77, 78 , 90, 91 , 98 , 105 )

Podaena trochanteralis Ordish, 1984: 17 , figs 31, 59, 86, 115.

Differential diagnosis. Male ( Fig. 105 ) body length (taken from anterior margin of labrum to elytral apex) 2.30 mm; female body length 2.40 mm. A rather large species, only matched in size by P. mariae , but several clear differences separate these two species, especially in the male foretibiae ( Figs 27−28 , 32−36 ) and genitalia ( Figs 69−70 , 77−78 ). The male maxillary palps are somewhat modified ( Figs 17−18 ). The third (penultimate) palpomere has a groove without lateral expansions, being cylindrical in almost all its length. The fourth (distal) palpomere has an inconspicuous groove. Being a large species, the male maxillary palps are the longest in the genus, with a certain degree of variability in the depth of the grooves among different populations.

The male foretibiae are well modified ( Figs 32, 36 ) with a marked lateral expansion in the shape of a tooth about mid-length, best observed on the anterior view ( Fig. 32 ), which allow a clear separation of P. trochanteralis from all species, except for P. obscura ( Figs 33, 37 ) and P. dentipalpis ( Figs 34, 38 ). Although the male foretibiae are similar among these three species in having a lateral expansion ( Figs 32−34 ) and tibial spines 1 and 2 closely inserted ( Figs 36−38 ), they show enough subtle differences that can be used for their separation in conjunction with the male maxillary palps.

The glabrous metaventral area ( Fig. 51 ), with a deep and wide longitudinal groove running from the anterior apex to the base, is diagnostic for P. trochanteralis . However, the male terminalia (as in Fig. 54 ) and the female terminalia ( Fig. 63 ) are very similar to those of other species. The male ventrite 7 and the spiculum ( Fig. 60 ) are larger than in other species, probably due to the larger size of this species.

The male genitalia of P. trochanteralis are markedly larger than in all other species. Furthermore, despite being moderately unsclerotized in the distal half, the main piece, the distal lobe and the parameres ( Figs 77−78 ) are different from those of its closest congeners. The proximal half of the main piece is cylindrical and well sclerotized, but dorso-ventrally compressed in its distal half. On a ventral view ( Fig. 78 ), the distal third of the main piece tapers abruptly, ending in a foliaceous distal lobe with a short flagellum. The spermatheca ( Figs 90−91 ) is very similar to those of several other species.

Distribution. As in Fig. 98 . Widely distributed in the north and west of the South Island, but with an apparent southern limit at about 44 o 30’.

Material examined. Type material. Holotype: South Island : Buller ( BR): Male – “Goings Bridge / Lewis Pass 815 m. / 11 Apr. 73 G.K.”.

Paratypes: South Island : Nelson ( NN) : 1 male (dry-mounted, genitalia missing) ( NZAC) : “Flora Stm. NN. / at Flora Hut / 28. Dec. 72 G.K.” . 1 female (dry-mounted) ( NZAC) : “Flora CK N.N. / 24 Mar. 73 / J.S. Dugdale ” . 1 male (dry-mounted) ( NZAC) : “Redmans CK. / Capleston 10.1.73 / J.C. Watt ” . 3 males, 1 female (in alcohol) ( NZAC) : “Orbit CK 810 m. / mt Kendall ”. Marlborough ( MB) : 1 male, 1 female (drymounted) ( NZAC) : “Altimarloch / Black Birch Ra / 1200 m., 16.1.73 / J.S. Dugdale ” . 16 males, 45 females (14 males in alcohol, 2 males dry-mounted: printed labels, 42 females in alcohol, 3 females dry-mounted: printed labels) ( MONZ) : “Altimarloch, MB / Black Birch RG / 1200 m., 16.1.73 / J.S. Dugdale ” . 2 females (dry-mounted) ( MONZ) : “Altimarloch MB / Black Birch Ra. 1200 m. / 16.1.73 J.S. Dugdale ”. Buller ( BR) : 1 male (dry-mounted, genitalia missing) ( MONZ) : “Rahu CK, Rahu Saddle / 6.4.73 J.S.D. 600 m. ” . 2 males, 5 females (in alcohol) ( NZAC) : “Rahu CK. 600 m. / Rahu Saddle / 6.4.1973. J.S. Dugdale ” . 1 male (drymounted) ( NZAC) : “Lewis Pass 900 m. / 11.4.73 G. K / swamp stream” . 9 males, 6 females (7 males in alcohol, 2 males dry-mounted: printed labels, 3 females in alcohol, 3 females dry mounted: printed labels) ( NZAC) : “Lewis Pass / Going Bridge / 815 m. 11.4.73”, “See Slide”. Male palps and legs (on microslide) ( MONZ) : “Lewis Pass / Going Bridge / 815 m. 11.4.73”. Westland ( WD) : 1 male, 1 female (dry-mounted) ( NZAC) : “ Haast Pass / opp. Pyke CK / 29 Mar 1973, G.K.” . 2 males, 2 females (1 male in alcohol, 1 male dry-mounted, teneral and without male genitalia, 2 females in alcohol) ( NZAC) : “ 5 km N of / Fox glacier / 29 Mar 73, G.K.” . 5 males, 2 females (4 males in alcohol, 1 male dry-mounted: printed label, 1 female in alcohol, 1 female dry-mounted: printed label) ( NZAC) : “ 8 males [sic] S. of / L. Paringa / 29.3.1973 / G.K. J. McB.” . 1 male (dry-mounted) ( MONZ) : “ L. Paringa / 29.3.73 G.K.”. North Canterbury ( NC) : 2 females (in alcohol) ( NZAC) : “Kelly CK. Arthurs Pass / 19.1.74 D.A. Craig ” .

Additional material examined. South Island : Nelson ( NN) : 1 male (dry-mounted: printed label) ( NZAC) : “ Flora Hut , NN / ex small bush strm. / 28 Dec. 1972 G.K.” . 1 male (dry-mounted: printed label) ( NZAC) : “The Brook NN / 11.2.73 G.K.”. Marlborough ( MB) : 1 male, 8 females (in alcohol) ( MONZ) : “Altimarloch, MB / Black Birch RG / 1200 m., 16.1.73 / J.S. Dugdale ” [surplus to the number of paratypes designated by Ordish 1984: 17. See Table 1] . 1 male (dry-mounted) ( MONZ) : “ Black Birch Ra. / Marlborough. NZ. / 16.Jan.1973 / J.S. Dugdale ” . 1 female (dry-mounted) ( MONZ) : “Black Birch Ra. MB./ 2000 m. 16. Jan. 73 / J.S. Dugdale ”. Westland ( WD) : 1 male, 1 female (dry-mounted) ( NZAC) : “ Haast Pass / opp. Pyke CK / 29 Mar 1973, G.K.” . 1 male (dry-mounted) ( CDMS) : “ Chelsea Creek. Haast Pass / Westland / NEW ZEALAND / 5−12−96 11−S / J.A. Delgado leg” . 1 male, 4 females (dry-mounted) ( NMWA) : “NEW ZEALAND: S-Isl. WD / Mount Aspiring Nat. P./ Haast River Valley / McPherson’s Creek / 4.2.1997 Schuh & Lang” . 2 females (dry mounted) ( SMDG, CDMS) : “New Zealand WD. Chelsea, Creek. Serpentine Creek, 15 km east of Haast. 200m, Leg. Jäger & Nunn 20.01.08” .

Figures

FIGURE 105. Habitus of P. trochanteralis (Lewis Pass). 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 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 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 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).

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 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.