''Phanaeus vindex'', the rainbow scarab, is a North American dung beetle, found from the eastern US to Arizona and Mexico. The

head A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste. Some very simple animals may ...

is a metallic yellow color, and males have a black horn which curves backward toward the

thorax The thorax or chest is a part of the anatomy of humans, mammals, and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the thorax is one of the three main divisions of the cre ...

. Both sexes have yellow

antenna Antenna ( antennas or antennae) may refer to: Science and engineering * Antenna (radio), also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g., TV or radio) waves * Antennae Galaxies, the name of two collid ...

e which can retract into a ball on the underside of the head. The thorax is a shiny coppery color, with yellow or green on the sides. The

abdomen The abdomen (colloquially called the belly, tummy, midriff, tucky or stomach) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. The abdomen is the front part of the abdominal segment of the torso. ...

is metallic green. The underbelly is black and green. The beetles are about 1–2.2 cm long. Males and females work in pairs to dig burrows beneath animal excrement. They move some of the excrement down into the tunnel, where the female lays her eggs in it. The grubs feed on the excrement for several

instar An instar (, from the Latin '' īnstar'', "form", "likeness") is a developmental stage of arthropods, such as insects, between each moult (''ecdysis''), until sexual maturity is reached. Arthropods must shed the exoskeleton in order to grow or ass ...

s until

pupa A pupa ( la, pupa, "doll"; plural: ''pupae'') is the life stage of some insects undergoing transformation between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their ...

ting. This species, like other dung beetles, is not a pest, and plays an important role in reducing waste in the environment.

References

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vindex Gaius Julius Vindex (c. AD 2568) was a Roman governor in the province of Gallia Lugdunensis. He was of a noble Gallic family of Aquitania (given senatorial status under Claudius) and was one of the men belonging to a faction of Empress Agripp ...

Coprophagous insects