Tactusa schnacki Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 18-19

publication ID

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

persistent identifier

https://treatment.plazi.org/id/7C67FC6F-2D22-FFBA-FF28-FF4EECA374E0

treatment provided by

Felipe

scientific name

Tactusa schnacki Fibiger
status

sp. nov.

Tactusa schnacki Fibiger View in CoL , new species

( Plate 1 View PLATE 1 , figure 5; male genit. plate 12, figure 4)

Material examined. Holotype: male, India NE, Assam, Khasis , -. viii.1894, genit. prep. 3733 M. Fibiger, coll. BMNH.

Taxonomic notes. T. schnacki is a member of the trigonifera species-group, which has a blackish triangular or quadrangular patch between the antemedial and postmedial lines, the typical Tactusa ampulla and a prominent, long, heavily sclerotised anellus that is totally fused to juxta.

Diagnosis. Imago (external). Wingspan: 12 mm.

Forewing: narrow, pointed at apex; ground colour brownish, darker by costal patch in medial area and in subterminal area.

Crosslines: only terminal line, marked by interneural black spots.

Reniform stigma: well marked; white.

Hindwing: dark grey with indistinct discal spot.

Underside: unicolorous grey.

Male genitalia. Tegumen: narrow.

Vinculum: strongly built.

Saccus: short; strongly built, broadly U shaped.

Fultura superior: membranous.

Valva: asymmetrical; left side broader and with one large ‘window’ (apo.).

Ampulla: forming a cross with axis of valva; slightly asymmetrical, ventral arm much larger than dorsal arm.

Digitus: present; humplike (apo.).

Juxta and anellus plate: fused; anellar plate triangular, heavily sclerotised.

Phallus: S shaped, with a prominent plate by ductus ejaculatorius and with two carina spines (apo.). Vesica: cylindrical, with small subbasal spined patch and tiny apical cornutus.

Female genitalia. Unknown.

Differential diagnosis. T. schnacki does not resemble T. trigonifera in external characters, but does so in several features of genitalia, e.g., asymmetrical ‘windows’ in left sacculus, triangular anellus, presence of a digitus, and two carina spines. It differs from other Micronoctuidae from SE Asian and Oriental regions in most of autapomorphies given under T. trigonifera below.

Distribution. Known from a single specimen from NE India, Assam.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Lepidoptera

Family

Erebidae

Genus

Tactusa

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