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Genus Lucidota

Black Firefly - Lucidota atra Black Beetle with Orange around Head - Lucidota Firefly - Lucidota atra Lucidota punctata - female larvae? with retractable head - Lucidota Small firefly? - Lucidota fireflies? - Lucidota - male - female Red-neck beetle - Lucidota punctata
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)
Superfamily Elateroidea (Click, Firefly and Soldier Beetles)
Family Lampyridae (Fireflies)
Genus Lucidota
Synonyms and other taxonomic changes
Lucidota LeConte, 1833
Explanation of Names
Lucida is Latin, meaning bright, shining, clear (1). Suffix -ota means "made", so this beetle is "made shining" (Internet searches, also compare Pelidnota). Blatchley (2) gives the meaning as "shining".
Numbers
Nearctica.com lists two species in genus: atra and punctata.
Beetles of Florida lists L. atra (G.A. Olivier), eUS, FL; L. luteicollis (LeConte), GA, FL, which would give a total of at least three species.
Size
circa 6-12 mm
Identification
Small to medium-sized day-flying fireflies that have light-producing organs reduced or absent. If present, appear as small yellowish spots on last abdominal sternite of female or last two sternites of male (3). Shape rather oblong and flattened ("depressed"). Antennae are long and flattened, though not quite serrate (3):

Dillon and Dillon (3) illustrate L. atra and L. punctata. and key: L. atra has granulate pronotum, L. punctata has punctate. They can be differentiated on size--L. atra is much larger, about 11 mm or so. L. punctata is circa 6 mm, much smaller.
See Also
Ellychnia are similar, diurnal fireflies that lack light-producing organs.
Print References
Blatchley, p. 817 (2)
Borror, entry for lucida (1)
Dillon, pp. 249-250, plate 26, keys, describes, illustrates L. atra and L. punctata (3)