Phausis inaccensa
LeConte, 1878
Shadow Ghost
Phausis inaccensa, commonly called the shadow ghost, is a small firefly notable for extreme . Females are , wingless, and bioluminescent, while males possess wings but lack lanterns. The species inhabits forested areas of the central and eastern United States. Females exhibit extended parental care, guarding clutches until death.
Pronunciation
How to pronounce Phausis inaccensa: /ˈfaʊ.sɪs ɪn.ækˈsɛn.sa/
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Identification
Males can be identified by their small size, textured wing covers, pronotal 'windshield' structures, and absence of lanterns (though pale abdominal patches may be present). Females are identified by their wingless, pale yellow, larva-like bodies and bioluminescent tail spots. The combination of flying lanternless males and glowing flightless females is unique among North American fireflies and distinguishes P. inaccensa from other Lampyridae.
Habitat
occur in dry forested ridgetops and in moister areas near forest streams and river bottoms. Females are found perched on leaf litter, low vegetation, or sticks on the ground.
Distribution
Recorded in the central and eastern United States, specifically: Texas, Oklahoma, Arkansas, Mississippi, Tennessee, Alabama, Georgia, North Carolina, Pennsylvania, Indiana, Michigan, and Minnesota.
Seasonality
activity occurs in early spring, with males flying at dusk.
Life Cycle
Females lay clutches of approximately 25 (range 20–30) and guard them until death, which occurs 1–2 weeks after oviposition. Eggs hatch approximately 35 days after laying. Newly hatched larvae are extremely small (1–2 mm) and bioluminescent. Larval and pupal stages have been observed but detailed duration and development are not well documented.
Behavior
Males fly at dusk searching for females. Females remain stationary on the ground or low vegetation, turning their glowing tails upward to attract males. Females are capable of multiple matings. Extended maternal care is exhibited: females guard clutches continuously until death. Post-mortem matriphagy by larvae has been hypothesized but not confirmed.
Human Relevance
Subject of research interest due to unusual reproductive and extreme . Not known to be of economic importance.
Similar Taxa
- Other Phausis speciesShare females and reduced male lanterns, but specific morphological details and geographic ranges differ
- Typical Lampyridae firefliesMost fireflies have winged, bioluminescent males and winged or short-winged females; P. inaccensa is distinguished by wingless glowing females and lanternless flying males
Misconceptions
More Details
Research history
The was poorly known until detailed studies by Lynn Frierson Faust and Timothy G. Forrest beginning in the early 1990s, with studied in Mississippi, Tennessee, Arkansas, Pennsylvania, North Carolina, and Minnesota.
Reproductive investment
Neotenic females invest all energy into production and guarding, with no resources allocated to wings or muscles.