Given the minimal gall description and lack of host association available for S guatemalensis, it is not clear whether it can be definitively separated from other Striatoandricus species from galls. As a globular woolly leaf gall on the lower midrib, it matches the description given for S barriosi, and S georgei, both of which are known from oaks found in Guatemala (insignis and bumelioides; rugosa, respectively). Adult descriptions confirm that the species are distinct, but these are based on museum specimens of S guatemalensis and no additional gall or host observations have been made since Cameron's original collection.
There are two taxonomic confusions relevant to Striatoandricus guatemalensis. The first is the assertion by Ritchie and Shorthouse that Cameron mistook an inquiline, a new species he named Synergus dorsalis, for the inducer of the gall. The other is the distinction between guatemalensis and Striatoandricus nievesaldreyi.
The Ritchie and Shorthouse synonymy is questionable because they assert that the synonymy is based on male and female specimens of Synergus dorsalis. Striatoandricus guatemalensis, like the rest of the genus, is currently known only from female specimens from agamic generation galls. There are no male specimens the male Synergus specimens could have been matched to. The synonymy is repeated without comment in the most recent redescription by Cuesta-Porta et al.
S guatemalensis was originally described from galls observed by Cameron on an unknown oak species in Guatemala, and possibly (see above) from wasps cut from those galls. Bassett later described Andricus ? mexicana from galls sent to him from Guadalajara, Mexico, without adult wasps. Kinsey received adult wasps cut from galls collected in Jalisco, Mexico. On the basis of those adults and galls, he formally described Andricus mexicanus and made Cynips guatemalensis a junior synonym, assuming it was the same species responsible for Bassett's galls in Mexico and Cameron's galls in Guatemala. Ritchie and Shorthouse repeat this synonymy but assert A guatemalensis as the valid name.
In 2011, Pujade-Villar et al created a new name, Andricus nievesaldreyi, to resolve the homonymy of Bassett's Andricus mexicana and Kinsey's Andricus mexicanus. They applied this name exclusively to Kinsey's A mexicanus and specifically excluded Bassett's gall from synonymy, effectively reversing Kinsey's original synonymy of those species. In more recent work, the Pujade-Villar group maintained Ritchie and Shorthouse's synonymy of Synergus dorsalis with guatemalensis, but did not list Bassett or Kinsey's mexicana/us as synonyms. Because of the lack of an adult specimen and the minimal gall description, Bassett's A mexicana may or may not match Kinsey's A mexicanus, now S nievesaldreyi. Bassett's galls are consistent in range (Mexico) and location (upper side of the leaf) with S nievesaldreyi and differ from S guatemalensis (Guatemala, lower side of the leaf).
