Organ-pipe-mud-dauber
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Trypoxylon
keyhole wasps, pipe organ mud daubers
Trypoxylon is a large genus of solitary wasps in the family Crabronidae, comprising approximately 634 species worldwide. The genus is notable for being the most speciose within its family. All studied species are active hunters of spiders, which they paralyze with venom to provision nests for their larvae. Nesting strategies vary: most species utilize pre-existing cavities such as hollow stems, beetle borings, or abandoned nests, while a minority construct free-standing mud nests. The genus is divided into two subgenera: Trypoxylon (smaller species) and Trypargilum (medium to large species).