Megalodacne
Crotch, 1873
pleasing fungus beetles
Species Guides
2- Megalodacne fasciata(Red-banded Fungus Beetle)
- Megalodacne heros(pleasing fungus beetle)
Megalodacne is a of large fungivorous beetles in the Erotylidae, distinguished by their size (9–22 mm), large , and distinctive color patterns of yellow, orange, or red markings on the . and larvae feed on hard bracket fungi, particularly Ganoderma and Fomes . The genus was established by George Robert Crotch in 1873 and is classified in the Megalodacninae alongside Episcapha and Episcaphula. Species occur across North America, Asia, Africa, and Southeast Asia, with some exhibiting and attraction to light.
Pronunciation
How to pronounce Megalodacne: //ˌmɛɡəloʊˈdækni//
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Identification
Large size (9–22 mm) distinguishes Megalodacne from similar-looking sap beetles (Nitidulidae), which rarely exceed 12 mm. Key diagnostic features include: large ; lack of depressions in the club joint of the ; first three tarsomeres cylindrical and similar in shape and size, with the fourth significantly shorter; and that completely cover the (versus exposed abdominal segments in similar Nitidulidae). Color patterns of yellow, orange, or red fascia on dark elytra are shared with many unrelated beetles and are not diagnostic alone.
Images
Habitat
Associated with hard bracket fungi, particularly Ganoderma and Fomes , which serve as both food source and larval development site.
Distribution
Eastern North America (M. fasciata, M. heros); Japan, Korea, and China (M. bellula, M. chinensis, M. immaculata); Southeast Asia including Sarawak, Sumatra, Malaysia, and Burma (M. elongatula, M. similima, M. varia, M. promensis); Africa including Tanzania (M. grandipennis, M. grandis); and Assam (M. marginata).
Diet
and larvae feed on hard bracket fungi, specifically Ganoderma and Fomes .
Host Associations
- Ganoderma - food sourcehard bracket fungus
- Fomes - food sourcehard bracket fungus
Life Cycle
deposited directly on fungi. Larval stage lasts 2–3 months. Two larval morphs exist: elongated larvae that bore into fungal fruiting bodies, or flattened, heavily sclerotized, sluggish larvae that feed alongside by gnawing shallow depressions. Adults commonly observed feeding with larvae. follows larval development.
Behavior
Some tropical are and attracted to light. and larvae frequently feed together on fungi.
Ecological Role
Fungivore specializing on hard bracket fungi; contributes to decomposition of woody fungal fruiting bodies.
Similar Taxa
- EpiscaphaFormerly classified together; shares Megalodacninae and similar appearance
- EpiscaphulaFormerly classified together; shares Megalodacninae and similar appearance
- GlischrochilusSimilar color patterns and overlapping range; distinguished by smaller size (≤12 mm), exposed abdominal segments