The gall's range is computed from the range of all hosts that the gall occurs on. In some cases we have evidence that the gall does not occur across the full range of the hosts and we will remove these places from the range. For undescribed species we will show the expected range based on hosts plus where the galls have been observed.
Description: Similar in appearance to galls of the skeletonplant pea gall wasp, but unlike that species, galls of the skeletonplant spindle gall wasp are directly integrated into the branch tissue. Overall, these galls are spindle-shaped swellings of the branches, often around 1 centimeter in length. Green and fleshy when fresh to brown and rough when dry and old.
Range: Thus far, this gall has only been located in several Midwestern states as well as southern Manitoba. However, as with the skeletonplant pea gall wasp, its range is probably far greater than currently known.
This gall is induced by an undescribed species of the genus Antistrophus. As with the skeletonplant collar gall wasp, this species was originally assumed to be a variant of the skeletonplant pea gall wasp, but preliminary results from an ongoing taxonomic study indicate that they are indeed different species.
