Trypoxylon-politum

Guides

• Sphaeropthalma pensylvanica

  velvet ant

  Sphaeropthalma pensylvanica is a velvet ant (family Mutillidae), a group of solitary wasps known for their striking aposematic coloration and painful sting. The species exhibits notable sexual dimorphism: females are wingless and resemble ants, while males possess wings. It has been documented as a parasitoid of mud dauber wasps, particularly developing within cocoons of the organ pipe mud dauber (Trypoxylon politum). Research has revealed unusual reproductive characteristics including facultative size-dependent sex allocation, where larger females produce proportionally more female offspring. The species is also notable for phoretic copulation, a mating behavior in which the male transports the female by flight or foot from the initial contact site before mating occurs.

  velvet-antsolitary-waspparasitoidphoretic-copulationsexual-dimorphismfacultative-sex-allocationMutillidaeSphaeropthalminaeTrypoxylon-politummud-dauber-parasitoidNearcticGeorgia-USAwingless-femalewinged-maleaposematic-coloration

• Sphaeropthalma pensylvanica pensylvanica

  velvet ant

  A velvet ant subspecies in the family Mutillidae, notable for being the first record of phoretic copulation in the subfamily Sphaeropthalminae. Males transport females by flight and/or foot from the initial contact site before mating occurs. The species is a solitary parasitoid with unusual sex allocation patterns and has been reared from cocoons of the organ pipe mud dauber (Trypoxylon politum).

  Mutillidaevelvet-antphoretic-copulationparasitoidsex-allocationTrypoxylon-politumSphaeropthalminaesolitary-waspHymenopteraNearctic