Podaena hauturu Delgado and Palma, 2010

Delgado, Juan A. & Palma, Ricardo L., 2010, A revision of the genus Podaena Ordish (Insecta: Coleoptera: Hydraenidae), Zootaxa 2678 (1), pp. 1-47 : 37-39

Podaena hauturu Delgado and Palma , new species

( Figs 5, 6 , 40, 44 , 96 , 107 )

Description. Male as in Fig. 107 .

Body: length (taken from anterior margin of labrum to elytral apex) 2.00 mm. Colour: head, pronotum and elytra dark brown; elytra with lighter proximal third and shoulders; legs and maxillary palps dark brown, similar to the body.

Head: prognathous, not retracted under the prothorax; evenly convex dorsally, smooth and glabrous, with sparse but distinct punctures; frons slightly convex, with well marked, narrow paraocular areas; eyes moderately protruding; labrum wider than long, bilobed and with a U-shaped median incision; maxillary palps long and modified ( Figs 5−6 ), with the two distal palpomeres together longer than the second, and the penultimate well grooved, subtriangular on the lateroventral view.

Thorax: Pronotum uniformly convex with inconspicuous lateral depressions, and with a subtle transverse posterior depression; surface smooth, moderately dense but clearly punctuated. Legs: relatively long and with very long middle and hind tarsi; foretibiae curved inwards in their distal third, with a shallow invagination and a long narrow distal end on lateral view ( Fig. 44 ); on the anterior view ( Fig. 40 ), the distal end associated with rows of setae is well expanded with an irregular edge. Metaventrite (as in Fig. 47 ) with a flat, cordiform glabrous area on the disc, with a central, oval and shallow concavity. Elytra with a smooth lateral rim in the anterior part but slightly serrate distally (as in Fig. 94 ).

Abdomen: Ventrite 7 and spiculum as in Fig. 57 , firmly attached. Ventrite 7 oval, distally emarginated; spiculum moderately long. Male genitalia as in Figs 75−76 , 79−80 ; main piece cylindrical and well sclerotized in its proximal half, flattened and laminar in the distal half; uniformly curved on lateral view (as in Figs 75 , 79 ); distal lobe of variable shape and indistinguishable from the distal part of the main piece; parameres wide and unsclerotized distally, very curved proximally, and weakly inserted to the phallobase, becoming easily dislodged when manipulated.

Female. Body: Similar to the male in shape; length (taken from anterior margin of labrum to elytral apex) 2.00 mm. Without modified maxillary palps and foretibiae.

Abdomen: Last tergite as in Fig. 65 ; gonocoxite as in Fig. 68 ; spermatheca as in Figs 87−92 with the proximal lighter area of the central piece about a fourth of its total length (as in Figs 89, 91 ), and the central piece variably curved in different specimens (as in Figs 87−88, 90, 92 ).

Differential diagnosis. The long and modified male maxillary palps ( Figs 5−6 ) clearly separate P. hauturu from P. aotea , P. glabriventris , P. maclellani , P. kuscheli and P. mariae . The male foretibiae ( Figs 40, 44 ) further separate P. hauturu from P. glabriventris , P. maclellani and P. mariae , while the distance between tibial spines 1 and 2 further separate P. hauturu from P. kuscheli ( Figs 35 , 44 ). The modified male maxillary palps of P. hauturu ( Figs 5−6 ) are sufficiently diagnostic to distinguish it from P. dentipalpis , P. obscura and P. trochanteralis ( Figs 11−18 ), but the shape and chaetotaxy of the male foretibiae, especially on the anterior view, are even more diagnostic (compare Figs 32−34 with Fig. 40 ).

Podaena hauturu is the largest species of the P. latipalpis complex. The male maxillary palps ( Figs 5−6 ) easily separate P. hauturu from P. aotea ( Figs 1−2 ) and P. moanaiti ( Figs 3−4 ). Although the male palps of P. hauturu are similar to those of P. latipalpis ( Figs 7−10 ), the third (penultimate) and fourth (distal) palpomeres are clearly longer in P. hauturu , making the whole palp longer and narrower than in P. latipalpis . Additional characters to distinguish P. hauturu from P. latipalpis are the shape and chaetotaxy of the male foretibiae, especially in the distal half, best seen on the anterior view ( Figs 40, 42 ).

Etymology. The species epithet hauturu is the name given to Little Barrier Island by Maori people, and also the type locality of this species. It is to be treated as a noun in apposition.

Type locality. Little Barrier Island, CL, North Island, New Zealand.

Distribution. As in Fig. 96 . Endemic to Little Barrier Island.

Material examined. Holotype: North Island : Coromandel (CL): Male (dry-mounted) ( NZAC): “Awaroa CK, Little Barrier / I. in litter, downstream / end of pool 90 m. / 9 March 74 J.S. Dugdale ”.

Paratypes: North Island : Coromandel (CL): 1 male, 4 females (1 male dry-mounted: printed label, 2 females dry-mounted: printed labels, 2 females in alcohol) ( NZAC): “Awaroa CK, Little Barrier / I. in litter, downstream / end of pool 90 m. / 9 March 74 J.S. Dugdale ”. 1 male, 1 female (dry-mounted: printed labels) ( MONZ): “Awaroa CK, Little Barrier / I. in litter, downstream / end of pool 90 m. / 9 March 74 J.S. Dugdale ” .

Figures

FIGURE 107. Habitus of P. hauturu (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 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 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 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 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 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 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.