Longiantrum quadra Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119: 58

publication ID

http://doi.org/ 10.11646/zootaxa.2583.1.1

persistent identifier


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scientific name

Longiantrum quadra Fibiger

new species

Longiantrum quadra Fibiger   , new species

( Plate 7, figure 4; male genit. plate 17, figure 1)

Material examined. Holotype: male, N Vietnam, Tonkin, Cha pa, leg. Gételot, 1920–1932, coll. L. & J. De Joannis, Museum Paris, genit. prep. 3946 M. Fibiger, coll. MNHM.  

Paratype: male, N. Vietnam, Da Lat , near institute, 10.xii.1994, leg. S. Mahunka, Gy. Sziraki & L. Zombori, genit. prep. 5927 M. Fibiger, coll. HNHM   .

Diagnosis. Imago (external). Wingspan: 10 mm.

Head, patagia, anterior part of tegulae, prothorax, basal part of costa, costal part of medial area, and terminal area, including fringes: dark brown, costal medial area quadrangular.

Forewing ground colour: yellow; with brown patches, especially along subterminal and terminal lines.

Crosslines: absent, except indistinct beige subterminal line.

Terminal line: marked by black interneural dots.

Reniform stigma: indistinct, ovoid, white.

Hindwing: light grey, fringes beige.

Underside: forewing light brown, hindwing light grey.

Male genitalia. Tergite: Y-shaped plate present (apo.).

Tegumen: narrow throughout.

Vinculum and saccus: very stout, three times as broad as tegumen.

Saccus: short; broadly U shaped.

Valvae: broadest at ¾; strongly asymmetrical; right valva larger; dorso-basally with small, thornlike process (apo.).

Clasper: barlike, along valva margins (apo.).

Ampulla: bilobed; prominently asymmetrical; left one larger and longer; lobes at valva almost straight ventrally; posteriorly rounded; each shaped as ¾ of a circle (apo.).

Digitus: tiny, triangular.

Juxta: trapezoid, medially narrowest, heavily sclerotised (apo.).

Anellus: prominently asymmetrical, relatively short, clublike, on right side with pointed process (apo.).

Phallus: extremely long; straight anteriorly; S-curved and coiled clockwise from ductus ejaculatorius; coecum short, apically rounded (apo.).

Vesica: armed with tiny cornuti.

Differential diagnosis. L. quadra   differs from other Longiantrum species   in:

- broad beige subterminal line;

male genitalia, in

- vinculum and saccus very wide, loglike;

- ampulla shaped as ¾ of a circle, asymmetrical;

- anellus short, clublike;

- phallus like a moving snake, broadest at coecum.

Distribution. L. quadra   known only from N Vietnam.


John May Museum of Natural History


Hungarian Natural History Museum (Termeszettudomanyi Muzeum)