N A T U R K U N D L I C H E S   I N F O R M A T I O N S S Y S T E M

Triodia amasinus (Herrich-Schäffer, 1851)

(zoological nomenclature: valid name, available)

General information:

Hepialus sylvinus amasinus Herrich-Schäffer, 1851: 39.
Type locality: Turkey, Amasia
Synonyms, misspellings, wrong determinations, etc.:
Hepialus amasinus f. signata Spuler, 1910. Type locality: Turkey. Infrasubspecific name.
Hepialus dobrogensis Caradja, 1932. Type locality: Romania. Junior subjective synonym.
Hepialus pinkeri Daniel, 1967. Type locality: Greece. Junior subjective synonym.

Pontischer Wurzelbohrer

Habit:

     
: Greece, Naussa, 1995.09.13, leg. Gernot Embacher, coll. Haus der Natur      
Picture from: Kurz Michael
Detailed view
     

Description of adults.
Examined: 1 , amendments following de Freina & Witt, 1990. Forewing length: 14 mm (wing expanse: 18 - 29,4 mm, 29 - 40 mm). Frons densly covered with distant, hair-like scales; hair-like scales on vertex shorter and more adpressed; eyes hemispheric, black, about 0.85 mm in diameter; some longer hair-like scales across the anterior part of the eyes; antennae very short, about 1/6 of forewing length, stout, on the anterior side with cross lamellae of about 0.2 mm length, bearing fine ciliae; palpi very short, completely covered by a long, brown shock of hair-like scales around the mouth; the latter in front and downwardly directed; thorax and tegulae furry-like covered by brownish beige, hair-like scales with partly reddish-brown and black-brown tips; forewings yellowish brown, posteriorly of the radial stem mixed with indistinct, umber-brown, square spots; a short, yellowish white, cross fascia at about 1/4 medially; a similar cross fascia from the middle of the inner margin in the direction towards the apex, reaching from almost the inner margin slightly above the middle of the wing; costal and outer margin brown; fringe yellowish brown; hindwings greyish brown with ochreous fringe; underside of wings yellowish brown, coppery shining, without markings; legs brown on the leading edge, tibiae and tarsi black speckled outwardly; femora at the dorsal side and underside of thorax with long, ochreous, hair-like scales; spurs missing; abdomen brown, densely covered with short, brown and yellowish brown, hair-like scales.

Remarks. The is distinctly larger than the , often darker with more or less distinct medial fascia. The ground colour of the species may vary from light yellowish to dark greyish brown.

Distribution:

T. amasina is distributed from the southern Balcans throughout Asia Minor to Kurdistan and northern Iran. Animals have been found so far between 600 and 1000 m a.s.l. (de Freina & Witt 1990).

Biology:

The species inhabits dry meadows. The adults fly in one generation from the end of August till the end of September and are mainly active in the evening dawn (de Freina & Witt 1990).

Stages in development:

Following de Freina & Witt (1990), the early instars are unknown.

Diagnosis:

 
 
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
Picture from: Kurz Michael
Detailed view
 

Triodia sylvina (Linné, 1761) has more distinct whitish fasciae on the forewing upperside, the posterior one nearly reaching the apex. Both fasciae nearly meet each other at the inner margin, forming almost a right angle. In T. amasina, these fasciae are far apart from each other at the inner margin, enclosing a quite acute angle. Triodia adriatica (Osthelder, 1931) has three indistinct, broad, whitish cross fasciae on the forewing upperside, running in a parallel way.

Worth knowing:

Sources:

de Freina, J. und T. Witt 1990. Die Bombyces und Sphinges der Westpaläarktis (Insecta, Lepidoptera), 2, Edition Forschung & Wissenschaft Verlag GmbH, München
Herrich-Schäffer, G. A. W. 1847–1855. Systematische Bearbeitung der Schmetterlinge von Europa, zugleich als Text, Revision und Supplement zu Jakob Hübner´s Sammlung europäischer Schmetterlinge. Zweiter Band. Die Schwärmer, Spinner und Eulen: 1-450, Index 1-64, Hepialides pl. 1, Cossides pl. 1-2, Zygaenides pl. 1-16, Sesiides pl. 1-10, Sphingides pl. 1-4, Bombycides pl. 1-32, Noctuides pl. 1-124, Nycteolidae pl. 1. Regensburg.

Publication data:

history:
Kurz Michael: 2007.01.01
Kurz Michael: 2009.07.10
Kurz Michael: 2017.03.01
not reviewed

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