Critically-imperiled
Guides
Boloria chariclea montinus
White Mountain Fritillary
The White Mountain Fritillary is a critically imperiled subspecies endemic to the alpine zone of the Presidential Range in New Hampshire's White Mountains. A glacial relict isolated for approximately 9,000 years, it represents one of the rarest butterfly populations in eastern North America. Systematic point-count surveys in 2012-2013 found highest densities in herbaceous-snowbank plant communities, though the more widespread heath-shrub-rush community likely supports the majority of adults. The subspecies is easily alarmed by human approach and exhibits variable detectability depending on weather conditions.
Floridobolus
Florida scrub millipedes
Floridobolus is a genus of large millipedes endemic to Florida scrub habitat in peninsular Florida. The genus contains three described species: F. penneri, F. orini, and F. floydi. These millipedes are notable for their oval cross-sectional body shape, distinguishing them from the circular cross-section typical of related spirobolid millipedes. F. penneri is critically imperiled due to habitat loss and restricted range.
Libellula jesseana
Purple Skimmer
Libellula jesseana, the purple skimmer, is a threatened dragonfly endemic to Florida, United States. Adults measure approximately 5 centimeters in length. The species is restricted to infertile, clear, sandy-bottomed lakes with specific shoreline vegetation, and is critically imperiled due to habitat degradation from human development.
Osmia calaminthae
blue calamintha bee
Osmia calaminthae is a rare mason bee endemic to a restricted area of Florida scrub habitat. The species was described in 2011 and is known from only eleven sites concentrated in the southern Lake Wales Ridge and Ocala National Forest. It exhibits striking blue coloration and shows extreme host specialization, depending primarily on two mint-family plants for pollen. The species is considered Critically Imperiled due to its extremely limited range, specific habitat requirements, and ongoing threats from development and pesticide exposure. It was rediscovered in March 2020 after concerns about its continued existence.