Hypomecis
Hübner, 1821
Hypomecis is a of geometrid established by Jacob in 1821. exhibit cryptic bark- or lichen-mimicking coloration and rest on tree trunks during daylight hours. The genus includes the Pale Oak Beauty (H. punctinalis) and Great Oak Beauty (H. roboraria), both widespread in Europe. sequencing has been completed for multiple species, revealing WZ sex determination and -level assemblies.
Pronunciation
How to pronounce Hypomecis: /hɪˈpoʊmɪsɪs/
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Identification
Distinguished from similar geometrid by the combination of oblique, hair-fringed reaching beyond the , , and characteristic with 10 and 11 arising from the . Cryptic lichen-mimicking patterns and resting on tree trunks aid field recognition.
Images
Appearance
oblique, extending beyond the with hair fringing below. have slightly (scalloped) . : 3 arises near the angle of the , veins 7–9 near the upper angle; veins 10 and 11 typically arise from the cell. with vein 3 from near the cell angle and crenulate cilia.
Habitat
varies by : broadleaved woodland (H. punctinalis); heath, moor, and short grassland (H. atomaria). select resting sites on bark to enhance .
Distribution
Widespread across Europe, including UK, Ireland, Scandinavia (Denmark, Norway, Sweden), and eastward through Asia to Japan. Distribution in some regions; H. atomaria collected from Beinn Eighe, Scotland.
Seasonality
active May to June, with partial second in August (H. atomaria) or mid-July (H. punctinalis, southern England).
Diet
Larval feeding: H. atomaria feed on heathers (heath/moor ) and trefoils, clovers, and vetches (grassland habitats). H. punctinalis larvae feed on oak, downy birch, silver birch, hawthorn, and sallows.
Host Associations
- pedunculate oak - larval H. punctinalis
- downy birch - larval H. punctinalis
- silver birch - larval H. punctinalis
- hawthorn - larval H. punctinalis
- sallows - larval H. punctinalis
- heathers - larval H. atomaria; heath and moor
- trefoils - larval H. atomaria; grassland
- clovers - larval H. atomaria; grassland
- vetches - larval H. atomaria; grassland
Life Cycle
Pupates close to ground; overwinters as . H. atomaria: -level assembly 690.01 Mb, 32 chromosomes including W/Z , 15.6 kb mitochondrial genome. H. punctinalis: 741.20 Mb genome, 30 chromosomal pseudomolecules (29 + Z), 15.64 kb mitochondrial genome, 13,897 -coding genes.
Behavior
resting : rest on tree trunks during daylight, selecting positions that enhance lichen-mimicking . Readily comes to light (H. punctinalis). Often disturbed from heather or short grass (H. atomaria).
Human Relevance
Subject of sequencing through Darwin Tree of Life project. Some (e.g., H. punctinalis, H. roboraria) serve as indicators of woodland quality. No known economic impact.
Similar Taxa
- Other Geometridae genera with bark-resting speciesHypomecis distinguished by specific palpal structure, , and ; many geometrids share cryptic coloration but lack the complete diagnostic character set.
More Details
Genomic resources
-level assemblies available for H. atomaria and H. punctinalis through Wellcome Open Research. H. atomaria karyotype 2n=62 with WZ/ZZ sex determination; small fully heterochromatic frequently enclosed by Z in WZ bivalent. Females show conspicuous sex-chromatin body absent in males.