Metura elongatus ( Saunders, 1847 )

Beaver, Ethan P., 2020, Revision of the genus Metura (Lepidoptera: Psychidae) with description of two new species, Zootaxa 4861 (2), pp. 188-210: 191-193

publication ID

https://doi.org/10.11646/zootaxa.4861.2.2

publication LSID

lsid:zoobank.org:pub:9616FBB9-6A81-4052-B085-08E6A17E33D0

DOI

http://doi.org/10.5281/zenodo.4538771

persistent identifier

http://treatment.plazi.org/id/038287B6-FFAA-CE46-FF02-B585FB5F9B6D

treatment provided by

Plazi

scientific name

Metura elongatus ( Saunders, 1847 )
status

 

Metura elongatus ( Saunders, 1847)  

( Figs 1 View FIGURE 1 A–B, 3A–B, 4A–B, 4K, 5A–F, 6B, 7A, 7D, 7G, 8A–B)

= Oiketicus elongatus Saunders, 1847   : pp. 43. Nielsen et al. 1996: pp. 35.

Syntype: ♂, ‘ Oiketicus elongatus Saund. Sidney   [sic] New South Wales’ in NHM. (Examined by photograph)   .

Type locality: Sydney, New South Wales, Australia.

= Oiketicus saundersii, Westwood 1854   : pp. 223. Unnecessary objective replacement name. Dalla Torre & Strand, 1929, [misspelled as O. saundersi   ]; Nielsen et al. 1996: pp. 35

= Phragmatoecia capucina Wallengren, 1861   : pp. 364. Nielsen et al. 1996: pp. 35.

Holotype: ♂, ‘Sidney, Novae Hollandiae, Octobris’ in NHM. (Examined by photograph).

Type locality: Sydney, New South Wales, Australia.

Additional material examined: 64 specimens (adults: 36 ♂, 1 ♀; larval bags: 26, larvae: 1) 11 ♂, 1 larva and 5 larval bags (in SAMA)   : 1 ♂ North Melbourne , 10 Oct 1918, Shannon / SAMA   no. 31-017586. 1 ♂ ( Fig. 1 View FIGURE 1 A–B) Gippsland, Vic / SAMA   no. 31-017587. 1 ♂ Warra , Qld, Lower coll / SAMA   no. 31-017588. 3 ♂ ‘ Australia’ Lucas coll / SAMA   no. 31-017589 to 31-017591. 2 ♂ no data / SAMA   no. 31-017592 and a further specimen with 31- 017596 / Dissection ID. EPB-018. 3 ♂ Melbourne , Vic / SAMA   no. 31-017593 to 31-017595. 5 larval bags: 1 ♂, 1 ♀ ‘ Australia’ Lucas coll / SAMA   no. 31-017601 to 31-017602. 3 ♀ no data / SAMA   no. 31-017598 to 31-017600. One larva no data / SAMA   no. 31-017597. 14 ♂ and 1 larval bag (in AM)   : 1 ♂ Narrabeen , NSW, 27 January 1963, P. Colman, bred   . 4 ♂ Sydney , NSW   . 1 ♂, Murrurundi , NSW, 10 October 1942, a further   ♂ with the date 18 October 1937. 1 ♂ Woolloomooloo , NSW, 30 September 1929   . 1 ♂ North Sydney , NSW, 25 January 1915, A.S. Lindsay   . 1 ♂ Manly , NSW, 10 September 1930, M. Gedale, a further   ♂ with the date 15 November 1915. 1 ♂ North Ryde , NSW, 16 November 1982, C.E. Chadwick, a further   ♂ with larval bag with date 10 September 1979. 1 ♂ Lower Beechmont , Qld, 1-4 January 1982, J & A. Holloway / Aus Mus no. K570249 / Dissection no. EPB-019   . 3 ♂ (in DAF)   : 2 ♂ Atherton , Qld, bred 11 March 1974, 12 Feb 1974, J.H. Barrett   . 1 ♂ Emerald , Qld, 11 July 1976, G. A. Waite, to light trap   . 4 ♂ (in ANIC)   : 1 ♂ Armidale , NSW, 26 Nov 1969, C.W. Frazier, bred ex pupa / 10ANIC-04436   . 1 ♂ Wollongong , NSW, Aust., 15 Oct 1971, V   .J. Robinson / 10ANIC-04437. 1 ♂ V   .J Robinson / 10ANIC-04438. 1 ♂ Ryde , NSW, 07 Oct 2004, H.S. Thirkell   . 3 ♂ (in MV)   : 3 ♂ no data. 1 ♂, 1 ♀, 20 larval bags (in EPBC)   : 1 ♂ 19 Dec 2019, Warrumbungles , NSW, Australia, 31°15’42.5”S 148°55’27.2”E, E.P. Beaver / coll. as first instar larva 27 Dec 2018, pupated 28 May 2019, eclosed 19 Dec 2019, ex. Eucalyptus   / Dissection ID EPB-017 GoogleMaps   . 1 ♀ 26 Nov 2018, Airlie Beach , Qld, Aust., 20°16’49.0”S 148°44’35.2”E, S & A. Pearson / Reared by E.P. Beaver / Dissection no. EPB-016. 20 larval bags GoogleMaps   : 2 ♂ 21 Nov 2018, Inverell , NSW, Aust., 29°47’19.3”S 151°08’18.6”E, on Corymbia maculata   GoogleMaps   . 1 ♀, 1 ♂ 27 Nov 2018, East Ballina , NSW, Aust., 28°51’08.5”S 153°35’37.0”E, E.P & G.P. Beaver, on Eucalyptus   and Glochidion ferdinandi   GoogleMaps   . 8 ♂, 2 ♀ 21 Nov 2018, Narrabri , NSW, Aust., 30°19’42.8”S 149°46’39.0”E, E.P. & G.P. Beaver, on Melaleuca   sp GoogleMaps   . 1 ♂ 11 Dec 2018, Gloucester , NSW, Aust., 32°00’14.4”S 151°57’32.7”E, E.P. & G.P. Beaver, on Melaleuca   sp GoogleMaps   . 1 ♂ 08 Dec 2018, Ebor , NSW, Aust., 30°24’14.7”S 152°20’50.6”E, E.P. & G.P. Beaver, on Eucalyptus pauciflora   GoogleMaps   . 1 ♂ 22 Nov 2018, Cangai , NSW, Aust., 29°33’47.2”S 152°29’14.5”E, E.P. & G.P. Beaver, on Leptospermum   GoogleMaps   . 1 ♂, 1 ♀ 26 Nov 2018, Airlie Beach , Qld, Aust., 20°16’49.0”S 148°44’35.2”E, S & A. Pearson GoogleMaps   . 1 ♂ 32 km NE of Kyogle, NSW, Aust. , 28°30’01.8”S 153°11’42.3”E, E.P & G.P. Beaver, on Syzygium   sp GoogleMaps   .

Diagnosis. The males of Metura elongatus   are quickly distinguished from most of the other species by the colour pattern of the thorax. In M. elongatus   , the patagium, tegula, and the anterior half of the mesoscutum is orange or yellow, and only the posterior half and mesoscutellum are black, whereas in the sympatric M. aristocosma   , M. phyllosacca   , and allopatric M. oceanica   the mesoscutum is entirely black. The allopatric Metura falcata   has an ‘elongatus-type’ thorax colour pattern, however may be distinguished by the shape of the hindwing, the termen of which is convex in M. elongatus   and concave in M. falcata   , with a more pointed apex in that species. Metura elongatus   is further distinguished from M. falcata   by the colour of the scales on the frons, which in M. elongatus   are uniform dark brown but are light orange-yellow in M. falcata   . The dark brown frons colour is shared with M. phyllosacca   however in that species the frons is typically a mixture of brown and orange scales. The male genitalia are similar only to M. falcata   and differences are discussed under that species. The late stage larva may be distinguished from other Metura   larvae (where known) by the colouration and pattern of the head and prothoracic shield. The frontoclypeus of the head is largely orange with darker blood-orange irregular markings ( Fig 7D, G View FIGURE 7 ) while in M. aristocosma   the head is cream coloured, and in M. oceanica   the orange colouration is broken into three sub-triangular markings, separated by black. In M. elongatus   the markings of the prothoracic shield consist of four black dorso-anterior lines from the posterior edge of the shield to near but not meeting with the anterior edge, with a single white dorso-anterior line along the medial line of the shield, with the remainder orange. This contrasts with M. aristocosma   , which has a mostly cream-coloured shield with yellow highlights towards the posterior edge, and black lines that extend only marginally beyond the spiracle, less than ½ the length of the shield. Additionally, the larva of M. oceanica   has both the anterior and posterior edges of the shield black. The larval bag design is also diagnostic. The primary materials used in the construction of the mature larval bag are sections of sticks and twigs, with bare patches of silk visible, whereas both M. oceanica   and M. phyllosacca   use foliage, and M. aristocosma   utilises fragments of stems and leaf veins, with no bare silk visible. The only other species to include sticks within bag design is M. falcata   however this species opts for fewer, smaller twigs with wider, less regular patches of silk, and the lower ¼ of the bag is bare or poorly adorned.

Redescription. Male. ( Fig. 1 View FIGURE 1 A–B, 3A–B, 8A–B) Forewing length 19–21 mm, hindwing 10–12 mm, expanse 42–44 mm.

Head. Scape trapezoidal, widest towards pedicel. Pedicel round, ½ length of scape, scape and pedicel covered in yellow-ochreous piliform scales. Antennae bipectinate, apical flagellomere filiform, 38 flagellomeres, brown scales dorsally, setose, rami 4x width of flagellomere at widest point. Frons dark brown, mixed ochreous-brown in some specimens. Vertex yellow-ochreous. Labial palps greatly reduced, two segmented, rectangular, narrow, final longest, apex pointed.

Thorax. Dorsal patagium, tegula, anterior half of mesoscutum yellow-ochreous, posterior half black, mesoscutellum black. Ventral similar. Forelegs yellow-ochreous, tarsi and posterior tibia black, mid and hindlegs black. When cleared all lightly sclerotised ( Fig. 5F View FIGURE 5 ), all tibiae with rounded node at ventral anterior apex. Foreleg with narrow elongate epiphysis, femur ventrally evenly convex. Mid and hindleg with two reduced, rounded tibial apical spurs. Forewing elongate, triangular; costa slightly concave medially, gently convex toward blunt apex, termen convex medially, inner margin concave posteriorly, convex anteriorly. Hindwing costa highly convex, apex blunt, termen convex, inner margin greatly expanded, convex, angular where A1 meets margin. Both forewing and hindwing surface black, all veins weakly scaled, translucent. Underside as for above.

Abdomen. Dorsally black, interspersed with yellow-ochreous scales at posterior 1/3 rd and weakly between tergites. Ventral similar, yellow-ochreous from posterior ½. Sternite SVIII ( Fig. 4K View FIGURE 4 ) narrow, elongate, paired anterior apophyses wide-set, apexes pointed, posterior-lateral corners rounded.

Genitalia. ( Fig. 4 View FIGURE 4 A–B). Saccus narrow, elongate, posterior margin broad ‘U’ shaped. Vinculum with vincular arms straight, parallel on inner margin with saccus, outer margin at acute angle towards tegumen, more heavily sclerotised towards tegumen. Tegumen outer margin slightly concave. Uncus broad, wider than high, posterior apex rounded, bifurcate, setose on dorsal aspect. Transitellar arms sclerotised, anterior margin convex, posterior straight. Valvae elongate, apexes bifurcate to two subequal-sized lobes, ventral lobe hooked, short spines at apex, inner dorsal margin setose with short irregular spines, sacculus heavily spined, globular, rugose texture. Phallus elongate, ventrally concave, dorsally convex, ductus ejaculatorius heavily spined, vesica smooth, pronounced uneven mushroom-shape, dorsal aspect almost twice length of ventral.

Female. ( Figs 5 View FIGURE 5 A–C, E) 50 mm length. Larviform entire body transparent. Head reduced, eyes present. Thorax dorsally sclerotised ( Fig. 5E View FIGURE 5 ), light brown, legs simple with single tarsal claw. Abdomen weakly sclerotised, yellow in life, corethrogyne broad, consisting of downy golden scales present in a ring around the sixth and seventh abdominal sternites and tergites, with additional scales present on TV and SV as a weak ring.

Genitalia. ( Fig. 5D View FIGURE 5 ) Apophyses anteriores reduced, arising from heavily sclerotised sternite. Apophyses anteriores moderately long.Antrum subtriangular, rugose. Corpus bursae ovoid, diverticulum narrow. Ductus bursae short, narrow. Ovipositor short, simple.

Larva. ( Fig. 7A, D, G View FIGURE 7 ) Head light to dark ochreous, with irregular darker patterns present on frontoclypeus particularly around setae. Maxilla, mandible dark ochreous. Pronotal shield of thorax dark ochreous with anterior margin ochreous, posterior and lateral margin black. Two black parallel lines along lateral surface, not meeting with anterior margin. Medial line narrow, white. Meso- and metathorax similarly patterned except anterior margins and interscleral membranes black or dark grey. Thoracic legs dark reddish brown, heavily sclerotised.

Larval Bag. ( Fig. 6B View FIGURE 6 , 7A View FIGURE 7 ) 80–160 mm length, 10–20 mm width. Silk grey to whitish cream. Adorned primarily with sections of twigs and stems from larval food plant, attached in loose parallel rows with areas of bare silk between each adornment. Twigs utilised may vary between 4–60 mm long, longest twigs attached near to posterior apex, attached along first ¾ length with remaining section free. Posterior apex often heavily adorned with narrow twigs, leaves or floral foliage.

Distribution. Metura elongatus   is widespread in the higher rainfall regions of eastern Australia ( Fig. 9B View FIGURE 9 ), from the Atherton Tableland in northern Queensland, south to Flinders Island, Tasmania, and as far west as Mount Gambier, South Australia ( ALA, 2020). In north Queensland the known records are mainly coastal or coastal montane, where rainfall is more reliable than further inland.

Biology and phenology. This species is highly polyphagous, and the larvae have been recorded feeding on a wide variety of plants, both angiosperms and gymnosperms, particularly Melaleuca   , Leptospermum   , Eucalyptus   ( Myrtaceae   ), Citrus   ( Rutaceae   ), Cotoneaster   ( Rosaceae   ), Cupressus   ( Cupressaceae   ), Pinus   ( Pinaceae   ), ( Common 1990) while additionally the present author has reared larvae on Corymbia   , Psidium   , Syzygium   ( Myrtaceae   ), Banksia   , Grevillea   ( Proteaceae   ), Alyogyne   (K. Messenger pers. comm.) Hibiscus   ( Malvaceae   ), Ligustrum   ( Oleaceae   ), Glochidion   ( Phyllanthaceae   ), Rosa   ( Rosaceae   ), Cyrtostachys   ( Arecaceae   ), Pelargonium   ( Geraniaceae   ), Alphitonia   ( Rhamnaceae   ), Casuarina   , Allocasuarina   ( Casuarinaceae   ) Lomandra   , ( Asparagaceae   ), and Dietes   (M. Connors pers. comm) ( Iridaceae   ). Young larvae construct a larval bag from fragments of leaves during their first four larval instars before transitioning to the utilisation of sections of twigs. A larva halfway through this transition is depicted in Figure 7A View FIGURE 7 . New twigs are added irregularly near the anterior aperture via a temporary incision in the bag (figured in: Clyne 2009). There is some sexual dimorphism in bag structure particularly length and width, with some female larval bags up to 160 mm long, and most males between 100–120 mm. Larger female specimens often opt to utilise many, smaller twigs rather than many larger ones. Several specimens are known with a single, very long twig or blade-like leaf, often these are male specimens however this feature is unreliable as considerable variation and overlap is known. Freshly moulted larvae are white, gradually darkening to orange over a series of days. There may be some clinal variation in the mature larvae of this species, with specimens from the northern part of the range a deeper orange, with a more prominent white medial line on the prothoracic shield. Larval development (first instar to pupation) is approximately 5–6 months (n= 4 larvae) while pupal duration for a single male specimen was 6 months and 21 days. Larval stages may be parasitised by wasps of the family Ichneumonidae Latreille ( Saunders 1847)   , particularly Echthromorpha intricatoria ( Fabricius, 1804)   and flies of the family Tachinidae Robineau-Desvoidy   , such as Chlorogastropsis orga ( Walker, 1849)   (L. Kirchmajer pers. comm). The adult male Metura elongatus   are nocturnally active and are attracted to UV and MV light generally between September and March. Unlike the larvae, which may be locally abundant and commonly encountered, adult specimens are rarely collected and are generally poorly represented in museum collections. Metura elongatus   will occur in a wide range of woodland ( Fig. 10B, C View FIGURE 10 ) and forest environments including temperate, subtropical, and tropical rainforest ( Fig. 10A, D View FIGURE 10 ), subalpine woodlands, agricultural and semi-urban environments such as parks, gardens, street trees.

Remarks. Both the type specimen of Oiketicus elongatus   and Phragmatoecia capucina   are extremely worn, poorly set, and are of only minimal use comparatively. For this reason, an intact specimen typical of this species is figured instead of a type, to allow for easy comparison between this and the following Metura   spp.

SAMA

South Australia Museum

AM

Australian Museum

ANIC

Australian National Insect Collection

V

Royal British Columbia Museum - Herbarium

MV

University of Montana Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Lepidoptera

Family

Psychidae

Genus

Metura

Loc

Metura elongatus ( Saunders, 1847 )

Beaver, Ethan P. 2020
2020
Loc

O. saundersi

Dalla Torre & Strand 1929
1929
Loc

Phragmatoecia capucina

Wallengren 1861
1861
Loc

Oiketicus saundersii

, Westwood 1854
1854
Loc

Oiketicus elongatus

Saunders 1847
1847
Loc

Oiketicus elongatus

Saund. Sidney 1827
1827