'Phengodes plumosa' (pictured) is generally known as which of the following?

'Phengodes plumosa', known generally as the glow-worm is a species of glowworm beetle in the family 'Phengodidae'. There are more than 30 described species in 'Phengodes'.

Glowworm beetles are so called because this family of beetles have wingless, bioluminescent females that appear to be larviform (a biological phenomenon occurring in some insect species, where the females in the adult stage of metamorphosis resemble the larvae to various degrees). They are able to produce light just like fireflies do; their light may be emitted as flashes or as a constant glow, and usually range in colour from green, yellow, to orange. The light comes from paired photic organs located on each body segment and appears as one glowing spot on each side of the body. Because these glowing spots along the body resemble the windows of train cars internally illuminated in the night, they are often also referred to as "railroad-worms." Sometimes these photic organs manifest into luminous bands between each body segment as opposed to singular spots.

Males of these species are not larviform, but instead resemble other beetles, though their first pair of wings (elytra) are less than half as long as their hind wings and the males of most species have very elaborate, feather-like antennae. These fancy antennae are used to detect and follow pheromones produced by the female. These male species may or may not be luminescent.

Glowworm beetles occur from southern Canada to Chile.