Seq # 321220030

Merrifieldia tridactyla (Linnaeus, 1758) Species

Last modified: Feb. 11, 2022, 10:56 a.m.

The presence of this very rare and local species in Belgium seems to be confined to the province of NA.


Family: Pterophoridae > Subfamily: Pterophorinae > Genus: Merrifieldia > Species: Merrifieldia tridactyla
Vernacular names
Egale tijmvedermot (NL)
First mention in Belgium
De Sélys-Longchamps E. 1844. Énumération des insectes Lépidoptères de la Belgique. — Mémoires de la Société royale des Sciences de Liége 2: 1–35. On page 25.




Wingspan about 20 mm.

Museum specimens

Specimens in nature

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The larva feeds on the flower buds and flowers of the food plant. Later on it also accepts the unripe seeds.
Pupation on the food plant. The pupal stage lasts only ca. 10 days.

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Flight periods

Two difficult to separate generations a year: from April to September.

Observed on

Host plant (species):
Thymus drucei, Thymus serpyllum, Thymus vulgaris, Thymus pulegioides, Thymus praecox, Mentha longifolia, Mentha suaveolens and Calamintha nepeta

Oligophagous on Lamiaceae like Thymus spp.

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Xerotherm slopes, mainly on limestone, where the foodplants grow.

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