Podaena maclellani ( Zwick, 1975 )

Delgado, Juan A. & Palma, Ricardo L., 2010, A revision of the genus Podaena Ordish (Insecta: Coleoptera: Hydraenidae), Zootaxa 2678 (1), pp. 1-47 : 24-26

Podaena maclellani ( Zwick, 1975)

( Figs 23 , 25, 26 , 50 , 53, 58 , 61, 62, 64 , 71, 72 , 85, 86 , 95 , 102)

Orchymontia maclellani Zwick, 1975: 249 , figs 5–10.

Podaena maclellani ( Zwick, 1975) ; Ordish, 1984: 16, figs 13, 20, 30, 57, 84, 113.

Podaena maclellani ( Zwick, 1975) ; Hansen, 1991: 22, fig 19.

Differential diagnosis. Male ( Fig. 102) body length (taken from anterior margin of labrum to elytral apex) 1.9−2.3 mm (mean 2.05); females of similar length to males. A morphologically variable species in size (see range) and colour (brown to black), but without any correlation between those features and their geographical distribution; therefore, there is no justification to subdivide this taxon. Internally, the male genitalia ( Figs 71−72 ) unequivocally distinguish P. maclellani from all species. Externally, the wide and round shape of the elytra, the unmodified male palps ( Figs 23 ) and less modified male foretibiae ( Figs 25−26 ) separate P. maclellani from all species except for P. mariae and P. glabriventris . However, it differs from P. mariae in size, shape of elytra, the chaetotaxy and length of the male palps (compare Fig. 23 with Figs 19−20 ), and the male foretibiae (compare Figs 25−26 with Figs 27−28 ). Furthermore, the male genitalia of P. maclellani have a thicker and straighter flagellum than in P. mariae ( Figs 69−72 ). Lastly, P. maclellani is readily separated from P. glabriventris , externally by the relative length of the third and fourth palpomeres ( Figs 23−24 ), the shape and size of the metaventral glabrous central area ( Figs 48, 50 ), the shape and chaetotaxy of last abdominal male tergite ( Figs 52−53 ) and the length of the spiculum in the male ventrite 7 ( Figs 56, 58 ). Internally, the male genitalia of P. maclellani and P. glabriventris also allow a clear separation of these two species ( Figs 71−74 ).

The morphology of the last abdominal tergite ( Figs 53 , 62 ) allows a better separation of the two sexes of P. maclellani than the foretibiae. Further, females of P. maclellani can be distinguished from all other Podaena females by the morphology of the last two tergites, the gonocoxite ( Figs 61−62, 64 ), and the spermatheca ( Figs 85−86 ). The male genitalia are completely sclerotized, with long thin parameres, a long slightly curved main piece and distal lobe, and a cylindrical, thick, straight flagellum ending in a pruinose apex. A transparent ejaculatory pump is associated with the flagellum ( Figs 71−72 ).

Distribution. As in Fig. 95 . Widely distributed over the South Island. Three specimens in two samples from Northland (ND) were identified as P. maclellani during the course of our study, being the first recorded samples of this species from the North Island (see Material examined below). Although the data associated with those three specimens may be erroneous due to contamination between samples or incorrect labelling, being samples recorded as collected in two different dates, we cannot overrule the possibility that a genuine northern population of P. maclellani does exist. Furthermore, our examination of the three northern specimens would indicate that they may even belong to a close but different species from P. maclellani (see Remarks below).

Remarks. The three specimens from the North Island recognized here as P. maclellani are somewhat different from the southern populations of the same species. The pronota and elytra are predominantly matt in the northern specimens, not shiny as in those from the South Island, and the pronotal punctures are larger and more densely distributed in the northern specimens. The only male available from the North Island has somewhat different genitalia from those in South Island males, but those differences can be attributed to individual distortions. Having only three specimens, including one single male, no final decision can be made regarding their true identity. Additional specimens from the Mangamuka area or from any other North Island locality are necessary to reach a meaningful conclusion.

Material examined. North Island: Northland ( ND): 1 male, 1 female (dry-mounted) ( NZAC) : “ Mangamuka / Gge. , 9. May 74 / G. Kuschel ” . 1 female (dry-mounted: printed label) ( NZAC) : “ NEW ZEALAND ND, / Mangamuka Saddle / 22 Sep. 1976 / G. Kuschel / litter in bush stream”. South Island : Nelson ( NN) : 1 male (in alcohol) ( NZAC) : “Sandy CK., nr Kawatiri / in bush, granite bed / 11º C 5.1.73. G.K.” . 2 males, 2 females (in alcohol) ( NZAC) : “Aniseed Valley NN. / 21.2.73 / small stm at Dam site”. 1 male (dry-mounted) ( NZAC) : “ L. Cobb. 800 m. / 9.Feb 73 G.K.” . 2 males, 4 females (1 male in alcohol, 1 male dry mounted: printed label, 4 females in alcohol) ( MONZ) : “L. Cobb 800 m. / 9.2.73 G.K.” . 12 males, 7 females (10 males in alcohol, 2 males dry-mounted: printed label, 6 females in alcohol, 1 female drymounted: printed label) ( NZAC) : “ Cobb Saddle / 1030 m. 9.2.73 / small slow stm /, in bush G.K.” . 2 males, 1 female (in alcohol) ( NZAC) : “ Cobb Saddle / 750 m. 15.1.73 / G. Kuschel ” . 1 female (in alcohol) ( NZAC) : “ Cobb Rd / 330 m. / 9 Feb 73, G.K.”, “small rapid / strm. in bush” . 5 males, 3 females (in alcohol) ( NZAC) : “Maitai V. NN / small stm at / S20 681262 / 25. Nov. 72. G.K.”. 7 males, 9 females (6 males in alcohol, 1 male dry-mounted: printed label, 9 females in alcohol) ( NZAC) : “ Maitai V. NN./ 2 nd Stream / 27.1.73. G.K.” . 5 males, 2 females (in alcohol) ( NZAC) : “Maitai V., NN. / Small stm at / S20 / 686 261, 26.11.72 G.K.” . 1 male, 6 females (in alcohol) ( NZAC) : “ Maitai Valley NN / 2 nd small stm. / 10.12.72. G.K.” . 2 females (in alcohol) ( NZAC) : “ Maitai V. NN. / 10. Dec 72 / stm at caretakers. / G. Kuschel ” . 1 male, 1 female (dry-mounted) ( NZAC) : “Maitai V., NN / 2 nd strm / 10 Dec 72, G.K.”. 1 female (dry-mounted) ( NZAC) : “Maitai V. / 10 Dec 72, G.K / at caretaker’s.” . 27 males, 18 females (in alcohol) ( NZAC) : “Maitai V., s. arm / upper Sanders CK. / 18.4.73 G.K.” . 5 males, 2 females (in alcohol) ( NZAC) : “Maitai V. / Lower Sanders / CK 18.4.73 G.K.” . 41 males, 37 females (in alcohol) ( NZAC) : “ Nelson City / Cleveland Trce. / 28 Jan 73 / G. Kuschel ”, “small stream / in bush” . 23 males, 22 females (21 males in alcohol, 2 males dry-mounted: printed labels, 21 females in alcohol, 1 female dry-mounted: printed label) ( MONZ) : “ Nelson City / Cleveland Tce / 31 Jan 73, G.K.”, “species 7 / strm in bush” . 1 female (in alcohol) ( NZAC) : “156A Cleveland Tce / Nelson City / 13. Nov. 72 G. Kuschel ” . 8 males, 4 females (in alcohol) ( NZAC) : “156A Cleveland Tce / Nelson City / 4. 12. 72 G.K.”. 17 males, 11 females (in alcohol) ( NZAC) : “Pearse V. NN / nr Ngatimoti. / 7.4.73 G.K.”. 1 female (in alcohol) ( NZAC) : “Orbit CK. 810 m. / mt Kendall / upper Karamea R / 10.2.73. A.K.Walker ” . 5 males, 2 females (in alcohol) ( NZAC) : “Orbit CK. 850 m. / Mt. Kendall / upper Karamea R. / 10. Feb.73 A.K.Walker ” . 3 males, 2 females (in alcohol) ( NZAC) : “ Moonstone Lake , Karamea R. / 7.2.73 small fastrunning / stm in dense bush A.K. Walker ” . 5 males, 4 females (in alcohol) ( NZAC) : “Anatoki R / nr. Takaka / 8 Feb 73, G.K.”, “in bush in / small side / stream” . 4 males, 1 female (in alcohol) ( NZAC) : “Anatoki R. / Takaka / 16 Jan 73, G.K.”, “in small / bush stream” . 3 males, 2 females (in alcohol) ( NZAC) : “ Takaka Hill / West side / 8.2.1973 G.K.” . 1 male, 3 females (in alcohol) ( NZAC) : “ Small CK at / Hope R. bridge / 470 m. 11.4.73 / G. Kuschel ” . 3 males (in alcohol) ( NZAC) : “ The Brook , NN / 3.2.73 G.K.” . 1 male, 1 female (drymounted: partially printed) ( MONZ) : “ The Brook, / Nelson, NZ. / 3. Feb. 73 / G. Kuschel ”. 9 males, 9 females (in alcohol) ( NZAC) : “ The Brook , NN / 11.2.73 G.K.” . 1 male, 1 female (in alcohol) ( NZAC) : “The Brook, NN, 11.Feb.73 G.K.”. 32 males, 29 females (in alcohol) ( NZAC) : “Dodson’s V. / Nelson / 5 Apr 73 / J S Dugdale”. 7 males, 13 females (6 males in alcohol, 1 male dry-mounted, 13 females in alcohol) ( NZAC) : “ Dodson’s Valley Stream / Atawhai, Nelson City / under broadleaf forest / 5 May 73 J.S.D.” . 1 male (drymounted) ( MONZ) : “Dobson’s V. stm. / Atawhai Nelson. / 5.5.73 J.S.D.”. 1 female (in alcohol) ( NZAC) : “ Dodson’s V. Atawhai NN 5 May. 73 / J.S. Dugdale Ex creek in lowland / broadleaf forest” . 5 males, 10 females (in alcohol) ( NZAC) : “ Tata Beach / Tarakohe / 20 Jan 73, G.K.”, “in small / bush stream” . 1 female (in alcohol) ( NZAC) : “Winter CK / Tarakohe / 14 Jan 73, G.K.”, “Partly bushy / stream prob / polluted” . 4 males, 4 females (in alcohol) ( NZAC) : “ Pigeon Sdl / Totaranui / 17 Jan 73, G.K.”, “Small bush stream / coarse sand in / granite country” . 1 male, 1 female (dry-mounted) ( NZAC) : “ Pigeon Sdl / Totaranui / 17 Jan 73 / G. Kuschel ” . 1 male, 3 females (in alcohol) ( NZAC) : “ Marsden V. NN / 28.1.73 G.K. / in bush” . 6 males, 8 females (in alcohol) ( NZAC) : “ Flora Hutt NN. / ex small bush stm. / 28.12.72 G.K.” . 1 male, 1 female (dry-mounted) ( NZAC) : “Flora Hut, NN / ex bush strm. / 28 Dec 72, G.K.”. 17 males, 12 females (16 males in alcohol, 1 male dry-mounted: printed label, 12 females in alcohol) ( NZAC) : “ 3 km S. of Surveyors CK. / Karamea Bluff. / 25 June 73 G.K. J.McB.” 54 males, 51 females (54 males and 50 females in alcohol, 1 female dry-mounted: printed label) ( NZAC) : “Clouston V. / Nelson / 10 Jun 73 G.K.”. 1 female (in alcohol) ( NZAC) : “Jam Tim CK., NN / Graham V. / 27 Dec 72, G.K.” . 1 male, 1 female (in alcohol) ( NZAC) : “ Mt Robert, Nelson. 1330 m. 24. Feb. 73 / A.K. Walker Sample taken from tussock / small trickle of water through tussock” . 2 males, (1 male in alcohol, 1 male dry-mounted: printed label) ( MONZ) : “ Gilbert Creek / Hope, Nelson / Grid Ref. S26. 224926 / 23.5.1973 / under beech forest / E. Greenough ”. Marlborough Sounds ( SD) : 1 female (in alcohol) ( NZAC) : “ Ship Cove 300m / upstream 1.12.72 / S16 509 488 G.K.” . 1 female (in alcohol) ( NZAC) : “ Ship Cove at / S16 / 512489, 27 Nov 1972. G.K.” . 3 males, 5 females (3 males in alcohol, 3 females in alcohol, 2 females dry-mounted: printed labels) ( NZAC) : “ Ship Cove, / Main stm, / 15.2.73. G.K.” . 2 males, 2 females (in alcohol) ( NZAC) : “ Ship Cove 150 m. / S16 509482 / 30. Nov. 1972 G.K.” 1 male (dry-mounted: printed label) ( NZAC) : “ Ship Cove 150 m., at S15|509 482, 30 Nov 1972 G.K.” . 1 male, 1 female (in alcohol) ( NZAC) : “ Tuamarina, Marlb. / 21.2.73 J. McB. / S22 305 155 / Pukaka stm.” . 3 males, 1 female (in alcohol) ( NZAC) : “ Picton | Marlb 21.2.73 / S22 310 228 J.McB” . 2 males, 2 females (drymounted: printed labels) ( NZAC) : “ Shakespear Bay / Picton 21 Feb 73 / J McBurney S22|283|275 / slow running small creek” . 22 males, 20 females (21 males in alcohol, 1 male dry-mounted: printed label, 20 females in alcohol) ( NZAC) : “ Shakespeare Bay, Picton / 21. Feb 73. J.Mc Burney / S22 / 283 275 in bush” . 22 males, 18 females (in alcohol) ( NZAC) : “ Havelock, 21. Feb. 73. J.McBurney / S21|073|246 slow running / stoney creek in bush” . 1 male, 1 female (in alcohol) ( NZAC) : “ Pelorus 21.2.73 / S21 879254 / shinglackin bush / J.McBurney ”. Marlborough ( MB) : 1 male, 2 females (in alcohol) ( MONZ) : “ HYDRAENIDAE / “nature walk”., Hanmer 15.vi.1984 ”. Buller ( BR) : 1 female (in alcohol) ( MONZ) : “LAKE ROTOITI 3 / 14.ii.73 / HYDRAENIDAE / det; C. Pettigrew ” . 8 males, 6 females (one teneral) (in alcohol) ( NZAC) : “ L. Rotoiti South I. / 5 Jan 73, G. Kuschel / swampy strm. in bush” . 2 males, 3 females (1 male in alcohol, 1 male dry mounted: printed label, 3 females in alcohol) ( NZAC) : “ L. Rotoiti small stm. / 5.1.73. G. Kuschel” . 1 female (teneral, in alcohol) ( NZAC) : “Redmans CK. Capleston / shaded channel 1 male wide / accumulated leaves between / rocks 2.4.73 J.S. Dugdale ” . 19 males, 12 females (in alcohol) ( NZAC) : “ Trib. of Giles CK, Inangahua V. / 1600 ’ under PB 15 canopy. / accumulation of leaves, + / bryophytes in bushrunnel / 4. April 73 J.S.D.” . 1 male (dry-mounted) ( NZAC) : “ Tributary of Giles CK. Inangahua / S.F. BR. 1600’ 4. Apr. 73 J.S. Dugdale / leaf accumulation from stream / in virgin forest (PB 15)” . 1 male (dry-mounted) ( MONZ) : “ Giles Ck. , 480 m. / Inangahua V. / 4.4.73 J.S.D.” . 1 male antenna (on microslide) ( MONZ) : “Giles CK Inangahua V. / 480 m., 4 April 73 J.S.D. / 7 km SW of Rotokohu ” . 1 male (dry-mounted) ( NZAC) : “Fletchers CK / nr. Reefton / 10 Jan 73 / J.C.Watt ” . 1 male, 3 females (in alcohol) ( NZAC) : “ Lewis Pass 900 m. / swamp stream / 11.4.73 G.K.” . 4 males (3 in alcohol, 1 dry-mounted: printed label) ( NZAC) : “ Lewis Pass / Goings Bridge / 815 m. 11.4.73” . 30 males, 21 females (29 males in alcohol, 1 male dry-mounted, 21 females in alcohol) ( NZAC) : “ Lewis Pass / 900 m. 11.4.73 / in small bush / stream G.K.” . 1 female (in alcohol) ( NZAC) : “ Maruia Saddle / 480 m., 11.4.73 / litter in stagnant” . 5 males, 3 females (4 males in alcohol, 1 male dry mounted printed label, 3 females in alcohol) ( NZAC) : “ Maruia Saddle / 430 m. 1.4.73 / G. Kuschel ” . 3 males, 2 females (2 males in alcohol, 1 male dry-mounted: printed label, 2 females in alcohol) ( NZAC) : “Rahu CK 600 m. / Rahu Saddle / 6.4.73 J.S. Dugdale ” . 1 male, 1 female (1 male dry-mounted: printed label, 1 female in alcohol) ( MONZ) : “ HYDRAENIDAE sp. / 12 October 1977 / RAHU SADDLE” . 1 male, 1 female (in alcohol) ( MONZ) : “NATIONAL MUSEUM, WELLINGTON, N.Z. / Reefton. Forested Stm / bentos S38 341 236 / 14. Apr. 76 B. Cowie ”. Kaikoura ( KA) : 1 female (in alcohol) ( NZAC) : “Wandle R / 390 m. 12.4.73 / G.K.” + J.McB”. Westland ( WD) : 9 males, 2 females (in alcohol) ( NZAC) : “ 8 km S of / L. Paringa / 29.3.1973 / G.K. J.McB. ” . 1 female (in alcohol) ( NZAC) : “ Haast Pass / opp Pyke CK. / 29.3.73 G.K.” . 9 males, 2 females (in alcohol) ( NZAC) : “Wells CK, D1 / Wells CK, WD, S87|953279 / 29 Mar 1973, G.K.” . 1 female (dry mounted) ( SMDG) : “ New Zealand WD. Chelsea, Creek. Serpentine Creek, 15 km east of Haast. 200m, Leg. Jäger & Nunn 20.01.08” . 1 male (dry mounted: printed label) ( CDMS) : “Rata Creek at Bridge 695 / 9.60 / Near Paringa Lake / NEW ZEALAND / 5−12−96 (10− Sur) / Podocarpus forest / J.A. Delgado leg”. North Canterbury ( NC) : 1 male (in alcohol) ( MONZ) : “ HYDRAENIDAE ? / Glentui R. area. / 16.X.73 R.L.C. P.” . 3 males, 7 females (1 male in alcohol, 2 males dry mounted: printed label, 5 females in alcohol, 2 females dry-mounted: printed label) ( MONZ) : “Entomology Dept., Univ. Alberta Canada / Loc. Kelly Creek, Arthurs Pass / Nat. P. WestCoast Elev. / Sta. Nº Date 19 Jan ’74”; on reverse “coll. D.A. Craig ”. Mid Canterbury ( MC) : 1 male, 1 female (in alcohol) ( NZAC) : “McClennans / Mt. Hutt. 11. Dec. 73 / Bush stream G.K.”. South Canterbury ( SC) : 1 female (in alcohol) ( MONZ) : “ Otepatotu 6.vii.73 / HYDRAENIDAE . (1)” . 3 males, 3 females (in alcohol) ( MONZ) : “ HYDRAENIDAE ? / Otepatotu 20.xi.73 / Coll: R.L.C. Pilgrim. / ca. 600 m. above sea level”. Central Otago ( CO) : 15 males, 10 females (14 males in alcohol, 1 male dry mounted: printed label, 10 females in alcohol) ( NZAC) : “ Bush strm at / Ida Cave / 26.6.73” .

Figures

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).