Mycotrupes gaigei

Olson & Hubbell, 1954

North peninsular mycotrupes beetle

Mycotrupes gaigei is a flightless, earth-boring scarab beetle to deep sand ridges in northwestern peninsular Florida. It is considered the most morphologically aberrant member of its , characterized by metathoracic wing degradation and fusion of prothoracic elytrae. The is an efficient burrower, tunneling through sand to depths exceeding six feet. It maintains an exclusive phoretic relationship with the mite Geotrupacarus mycotrupetes, which does not occur on any other Mycotrupes species.

Mycotrupes gaigei by no rights reserved, uploaded by Adam Pitcher. Used under a CC0 license.

Pronunciation

How to pronounce Mycotrupes gaigei: /maɪkoʊˈtruːpiːz ˈɡaɪdʒiːaɪ/

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Identification

Distinguished from other Mycotrupes by its restricted distribution in northwestern peninsular Florida and by the exclusive presence of the phoretic mite Geotrupacarus mycotrupetes. Flightlessness due to metathoracic wing degeneration and elytral fusion separates it from winged co-occurring geotrupids such as Geotrupes egeriei. Considered the most aberrant member of the Mycotrupes based on morphological characteristics.

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Habitat

Deep, well-drained sand ridges overlying porous limestone in northwestern peninsular Florida. Associated with xeric, open woodland dominated by turkey oak and bluejack oak, with clumps of seedling oaks, low shrubs, leaf litter, grasses, and herbs.

Distribution

Northwestern peninsular Florida, USA. Restricted to deep sand ridge ; with other Mycotrupes .

Diet

feeder utilizing , decaying fungi, plant litter, and exposed soft tissue of acorns. Accepts virtually any available organic food substrate.

Host Associations

Geotrupacarus mycotrupetes - phoretic mite associateExclusive to M. gaigei among all five described Mycotrupes ; attaches preferentially behind I or in the gular area. Early derivative macrochelid mite not found on other Mycotrupes species despite their sympatric distributions.
Geotrupes egeriei - co-occurring Winged geotrupid that co-occurs in Florida; strongly attractive to G. mycotrupetes in laboratory settings but has not expanded the mite's range beyond peninsular Florida.

Behavior

Efficient burrower, tunneling down through sand to depths exceeding six feet. Flightless, with restricted searching capacity due to wing loss. Molecular evidence suggests originated from southward of M. retusus from the Fall Line after late Pleistocene sea level changes.

Similar Taxa

Mycotrupes retususOther Mycotrupes ; M. gaigei likely originated from southward of M. retusus ancestor. Separated by geography and (M. retusus occurs in Georgia/South Carolina sand hills).
Geotrupes egerieiWinged geotrupid co-occurring in Florida; distinguished by capability and lack of exclusive mite association with G. mycotrupetes.

More Details

Evolutionary significance

Flightlessness in Mycotrupes arose early in the due to metathoracic wing degradation and fusion of prothoracic elytrae. M. gaigei represents a derived lineage that colonized Florida sand ridges following late Pleistocene sea level changes.

Mite specificity

The exclusive association with Geotrupacarus mycotrupetes is notable given that other Mycotrupes are sympatric with G. egeriei, which attracts the mite in laboratory conditions, yet the mite has not expanded its range to these other or beyond peninsular Florida.