Tormus posticalis ( Broun, 1917 )

Fikáček, Martin, Minoshima, Yûsuke, Vondráček, Dominik, Gunter, Nicole & Leschen, Richard A. B., 2013, Morphology of adults and larvae and integrative taxonomy of southern hemisphere genera Tormus and Afrotormus (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae 53 (1), pp. 75-126 : 110-113

Tormus posticalis ( Broun, 1917) stat. restit.

( Figs 3–6 , 9 A–B)

Stygnohydrus posticalis Broun, 1917: 371 . Type locality: New Zealand, Fiordland, Hollyford.Transferred to Tormus by HANSEN (1991: 183). Synonymized with T. helmsi by HANSEN (1997: 360).

Type material examined. LECTOTYPE (designated by HANSEN (1997)): unsexed specimen ( BMNH): Type [round label with red margin] // 3819 // New Zealand / Broun Coll. / Brit. Mus. / 1922-482. // Hollyford / 19.2.1914. // Stygnohydrus / posticalis // LECTOTYPE / Stygnohydrus posticalis Broun // M. Hansen des.1995’. PARALECTOTYPES: 1 ♂, 4 unsexed spec.( BMNH): 3819. // New Zealand / Broun Coll. / Brit. Mus. / 1922-482. // Hollyford / 19.2.1914. // PARALECTOTYPE / Stygnohydrus posticalis Broun / M. Hansen des. 1995”; 1 ♂, 3 spec. ( NZAC): Coll. / T. Hall. / 19.2.1914 // Hollyford / Southland / South Island // 3819. // Stygnohydrus / posticalis / Broun. // T. Broun / Collection // A. E. Brookes / Collection // PARALECTOTYPE / Stygnohydrus / posticalis Broun, 1917 // des. M. Fikáček 2012’. [Note. The four specimens deposited in NZAC are not mentioned by HANSEN (1997) who designated the lectotype of S. posticalis . However, their labels correspond precisely with the original description in which T. Hall is even mentioned as the collector of the type specimens. For that reason, the specimens are clearly a part of the original type series and must be considered as paralectotypes. They were labelled accordingly by us].

Additional adult specimens examined (129 specimens). NEW ZEALAND: WESTLAND: 3 spec. ( LUNZ): Cascade State Forest , Jackson River, elev. 30 m [44°4.99′S 168°39.117′E], 12.iv.1982, lgt. J. W. Early (LCNZ82/113 ; 1 ♀ ( NZAC): Jackson Bay [43°58.1′S 168°36.5′E], 23.ix.1979, lgt. A. K. Walker (79/90) ; 1 ♀ ( NMPC): Wharekai Te Kau walk, Jackson Bay, elev. 25 m, 43°58.1′S 168°36.5′E, 5.xi.2007, lgt. R. Leschen & C. Carlton (RL1293) ; 7 spec. ( NMPC, NZAC): same locality, 12.xii.2012, lgt. Fikáček, Hájek & Leschen ( NZ 54) . FIORDLAND: 1 spec. ( NZAC): 2 mi. below Hollyford camp [44°44′S, 168°8′E], 10.xii.1966, lgt. A. K. Walker ; 2 spec. ( NZAC): 4 miles E of Milford , elev. 220 m [44°39′S, 167°59′E], 20.ii.1965, lgt. N.A. Walker ; 3 spec. ( NZAC): 7 miles into Hollyford valley [44°43′S 168°7′E], 20.ii.1965, lgt. N. A. Walker ; 1 spec. ( NZAC): Bauza Island [45°17′24″S 166°54′55″E], 27.xi.1981, lgt. C. F. Butcher (81/187) ; 1 ♀ ( NZAC): Cascade Creek , Eglinton valley [ca. 44°53′45″S 168°5′3″E], 30.x.1966, without collector ; 2 spec. ( NZAC): Cleddau Valley , 44°42.9′S 167°57.4′, 2005, lgt. T. Jewell ; 1 ♀ ( NZAC): Dashwood Stream , Spey River, elev. 230 m [45°31′50″S 167°12′17″E], i.1970, lgt. A. C. Eyles ; 2 spec. ( NZAC): Deep Cove , Lydia river, elev. 213 m [45°30′21″S 167°7′49″E], i.1970, lgt. I. Townsend ; 2 ♀♀ ( NZAC): E slope of Mt. Lyttle , above Motoi camp, elev. 914 m [44°46′32″S 168°5′35″E], 15.xii.1966, lgt. A. K. Walker ; 2 spec. ( NZAC): Fiordland National Park , Deep Cove [45°26′43″S 167°8′32″E], i.1970, lgt. I. Townsend ; 1 spec. ( LUNZ): same locality, 3.ii.1983, lgt. D. R. Penman ; 2 spec. ( LUNZ): same locality, 1.ii.1988, lgt. J. W. Early ; 13 spec. ( LUNZ, NMPC): Fiordland National Park , Grebe valley neat NZED base, elev. 270 m [45°39′S 167°22′E], 4.ii.1982, lgt. R. M. Emberson & P. T. Syrett ; 3 spec. ( LUNZ, NMPC): Fiordland National Park , S arm of Lake Manapouri [45°34′S 167°23′E], 4.ii.1982, lgt. S. P. Worner ; 1 ♂, 2 ♀♀, 8 spec. ( FMNH, KSEM, NMPC): Fiordland NP, Milford Sound road, Tutoko Track, elev. 70 m [40°39.5′S 167°58.7′E], 9.xii.2005, lgt. A. Newton & M. Thayer (FMHD#2005-86) ; 1 ♀ ( JNIC): First Bay , Lake Hauroko [46°0′S 167°19.7′E], 6.i.1996, lgt. J. T. Nunn ; 1 spec. ( NZAC): Gut Bay [45°17.71′S 166°57.46′E], 23.xi.1981, lgt. C. F. Butcher (81/177) ; 5 spec. ( NZAC, NHMW, ZMUC): same locality, 24.xi.1981, lgt. C. F. Butcher (81/180) ; 1 spec. ( NZAC): same locality, 26.xi.1981, lgt. C. F. Butcher ; 3 spec. ( NZAC): Hollyford [44°45′34″S 168°8′26″E], 20.ii.1965, lgt. N.A. Walker ; 3 spec. ( NZAC): Hollyford valley , below Hidden Falls, [44°37′49″S 168°7′20″E], without date and collector ; 1 spec. ( NZAC): Hollyford valley , Hidden Falls [44°37′49″S 168°7′20″E], 6.i.1967, lgt. A. K. Walker ; 1 spec. ( NZAC): Key Summit , elev. 450 m [44°48′54″S 168°7′38″E], 14.xii.1966, lgt. A. K. Walker ; 1 ♂ ( NZAC): Lake Manapouri env., Mica Burn et West Arm, elev. 180–230 m [45°29′49″S 167°13′54″E], i.1970, lgt. G. W. Ramsay ; 1 ♀ ( NZAC): Lake Manapouri , Tyrret Range, Wolfe Flat, elev. 600–680 m [45°32′S, 167°18′E], i.1970, lgt. G. W. Ramsay ; 29 spec. ( NZAC, ANIC, DBCP, NMPC): Lake Manapouri , West Arm [45°30′43″S 167°18′22″E], i.1970, lgt. I. Townsend ; 6 spec. ( NZAC): Milford Road 20 mi. [44°51′S 168°6′E], 1.xi.1966, lgt. J. I. Townsend ; 2 spec., 1 ♂ ( NZAC): Milfourd Sound , [44°40′22″S 167°55′30″E], 1.xi.1966, lgt. J. I. Townsend ; 1 ♂ ( NZAC): Mt. Christina forest , elev. 320 m [44°48′S 168°6′E], 22.xii.1947, lgt. J. T. Salmon ; 5 spec. ( NZAC): Percy stream, Tyrret range, elev. 460 m [45°33′22″S 167°16′16″E], i.1970, lgt. I. Townsend ; 1 spec. ( NZAC):same locality, 11.i.1970, lgt. J. McBurney ; 1♀ ( LUNZ): Spey valley , elev. 180 m [45°32′57″S 167°12′51″E], 5.ii.1983, lgt. J. W. Early & C. A. Muir (LCNZ83/5) ; 1 ♂ ( NMPC): Resolution Island , Acheron Passage (NE side), Dusky Sound, elev. 5 m, 45°42′37″S 166°39′2″E, 22.i.2011, lgt. S. A. Forgie (SAF044) ; 5 spec. ( NZAC, NMPC): Secretary Island , Grono Bay Track [45°16.933′S 166°56.67′E], 1.xii.1981, lgt. C. F. Butcher (81/190) .

Larval specimens examined (not described here). NEW ZEALAND: FIORDLAND: 2 L1, 6 L2, 5 L3 ( FMNH, YMC, NMPC): Fiordland NP, Milford Sound road, Tutoko Track, elev. 70 m [40°39.5′S 167°58.7′E], 9.xii.2005, lgt. A. Newton & M. Thayer (FMHD#2005-86).

Redescription of adults. Body length 3.0– 3.6 mm (holotype 3.5 mm), body width 1.9–2.2 mm (holotype 2.1 mm). Head and pronotum with sparsely arranged but rather coarse punctures, without microsculpture on interstices; elytra anteriorly with sparse punctuation consisting of punctures slightly smaller than those on pronotum, interstices smooth. Elytra evenly convex, oblique posteriorly in lateral view. Parameres of aedeagus with distinct apical hook directed laterad ( Figs 9 A–B).

Larvae. Larvae of this species were not examined in detail, but the basic study did not reveal any characters distinguishing them from those of T. helmsi described above.

Figures

Fig. 3. Adult head appendages of Tormus posticalis (Broun, 1917).A – labrum in dorsal view; B – labrum in ventral view (epipharynx); C – mandible; D – labium; E – maxilla; F – antenna.

Fig. 4. Head and prothorax morphology of T. posticalis (Broun, 1917). A – clypeus and labrum in dorsal view; B – head in ventral view; C – trichobothrium (‘systematic puncture’) on frons; D – labial palpus; E – mouthparts in ventral view; G – prothorax in posterior view; H – prothorax in ventral view; I – trichobothrium on pronotum; J – anterior margin of pronotum.

Fig. 5. Morphology of Tormus posticalis (Broun, 1917).A – meso- and metathorax in ventral view; B – mesoventral process in ventrolateral view; C – mesoventral process in ventral view; D – internal view of meso- and metathorax with mesofurca; E – coxa, trochanter and basal portion of femur of mesothoracic leg; F – basal portion of epipleuron; G – scutellum; H – coxa, trochanter and basal portion of femur of metathoracic leg; I – detail of lateral margin of elytron with trichobothrium; J – detail of elytra punctuation with distinct trichobothria; K – elytron in dorsal view.

Fig. 6. Morphology of Tormus posticalis (Broun, 1917). A – abdomen in ventral view; B – abdominal laterosternites 3–4; C – details of organized stridulation file on laterosternites 3.

Fig. 9. Variability of the aedeagus morphology in Tormus posticalis (Broun, 1917) (A–B) and T. helmsi Sharp, 1884 (C–N). Data on the specimens: A – Westland, Jackson Bay (voucher COL1770); B – Fiordland: Milford Sound (voucher D2); C – Taranaki, Mt. Egmont NP (voucher MF500); D – Bay of Plenty, Mt. Te Aroha (voucher D5); E – Waikato, Mt. Pirongia; F – Buller, Bullock Creek; G – Nelson, Oparara Arches (voucher MF499); H – Buller, Paparoa NP (voucher MF503); I – Buller, Italians Creek; J – Westland, Three Mile Lagoon (voucher MF506); K – Westland, Pleasant Flat; L – Westland, Cross Creek (voucher MF498); M – Westland, Gillespies; N – Westland, Matheson Lake (voucher COL1802).