Gyllenhal-1838
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Sphenophorus crenatus
Sphenophorus crenatus is a weevil species described by Gyllenhal in 1838. It is currently treated as an ambiguous synonym of Cactophagus crenatus in modern taxonomic databases. The species belongs to the family Dryophthoridae, a group formerly classified within Curculionidae. Like other members of the genus Sphenophorus (billbugs), it is presumed to have a weevil body plan with an elongated snout, though specific morphological details for this particular species are not well documented in available sources.
Sphenophorus gagatinus
Sphenophorus gagatinus is a species of weevil in the family Dryophthoridae, first described by Gyllenhal in 1838. It is one of numerous billbug species within the genus Sphenophorus, a group of economically significant turfgrass and crop pests. The species occurs in North America, though specific details regarding its biology, host associations, and pest status remain poorly documented compared to better-known congeners such as S. parvulus and S. callosus.
Sphenophorus sayi
Sphenophorus sayi is a weevil species in the family Dryophthoridae (formerly treated as Curculionidae), described by Gyllenhal in 1838. The genus Sphenophorus contains billbugs, several of which are significant agricultural pests. Related species such as Sphenophorus callosus (southern corn billbug) and Sphenophorus levis (sugarcane weevil) are well-documented crop pests, but specific information on S. sayi remains sparse. The species is recorded from North America including British Columbia, Canada.