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Beetles of Zihuatanejo

ORDER COLEOPTERA

Round Passandrid
Taphroscelidia linearis

-Animals (Kingdom Animalia)

-Arthropods (Phylum Arthropoda)

-Hexapods (Subphylum Hexapoda)

-Insects (Class Insecta)

-Winged and Once-winged Insects (Subclass Pterygota)

-Beetles (Order Coleoptera​​)

-​Water, Rove, Scarab, Long-horned, Leaf, and Snout Beetles (Suborder Polyphaga)

-​Cucujiform Beetles (Infraorder Cucujiformia)

-Superfamily Cucujoidea

-Parasitic Flat Bark Beetles (Family Passandridae)

-Genus Taphroscelidia

-Round Passandrid (Taphroscelidia linearis)


The Round Passandrid (Taphroscelidia linearis) is a small, parasitic flat bark beetle native to the Southeastern United States, Central America, and the West Indies. It is known for its distinctive morphology and a life cycle that involves parasitism on other wood-boring insect larvae. The larvae are ectoparasites, feeding externally on the larvae or pupae of other wood-inhabiting beetles, such as bark beetles, weevils, and longhorn beetles.

Diet

  • Adults: The feeding habits of Taphroscelidia linearis are poorly understood. Adults are associated with bark and the galleries of wood-boring insects, where they may prey on small organisms or consume material associated with the galleries.

  • Larvae: The immature biology is particularly poorly known. Members of Passandridae are generally associated with wood-boring insect larvae and pupae, and T. linearis has been recorded inhabiting bark-beetle galleries.

Range

  • Taphroscelidia linearis is a parasitic flat bark beetle in the family Passandridae.

  • It is occasionally sighted in Zihua. Its cryptic life beneath bark and within insect galleries means that it is probably encountered far less often than it actually occurs.

  • The species has also been found at black lights, providing one of the more practical ways of encountering the adult beetles.

Habitat

  • Associated with dead and dying trees, fallen branches, bark and galleries made by wood-boring insects.

  • Around Zihua, examine loose bark on dead trees and branches, particularly where there are numerous beetle galleries.

  • Adults may also be attracted to UV or black lights at night.

  • Because the species is extremely cryptic, finding its habitat is much easier than finding the beetle itself.

Size

  • Adult length: approximately 4.4–7.1 mm (0.17–0.28 in).

  • Body elongated, narrow and somewhat flattened, an excellent shape for moving through bark crevices and insect galleries.

  • Generally reddish-brown to dark brown, with a relatively long body and distinctive narrow form.


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