All world-wide specimens in Stigmatoteuthis were considered by Voss (1969) to belong to H. dofleini. Voss et al. (1992) after examining the type of Histiopsis hoylei Goodrich, 1896, placed all known specimens in the synonomy of this earlier named species, Histioteuthis hoylei (Goodrich, 1896). Voss et al., (1998) recognized that the Atlantic form was diffferent and should be called H. arcturi (Robson, 1948). They based the separation primarily on striking differences in the spermatophore and hectocotylus of the mature male. Unfortunately few mature specimens were known for comparisons. The males that represented H. hoylei came from north temperate waters off California and Japan. We have examined specimens from off Hawaii and found they have spermatophores with the distinctive ejaculatory apparatus of H. arcturi from the Atlantic but differ in some features of the hectocotylus. Therefore, the Pacific forms divide into a temperate North Pacific species which carries the name, H. dofleini, and a more southern species, H. hoylei. Instead of placing H. hoylei and H. arcturi in synonomy, we maintain the separation of these species as Voss et al.,(1998) list other separating characters such as features of the gladius, beak, web and arm lengths that are not all related to maturity and are based on squids from a wider geographical range. We place all members of the hoylei-group into the genus Stigmatoteuthis.
In this clade of histioteuthids with bilaterally paired male secondary sexual organs, the first species described was Histiopsis hoylei Goodrich 1896. However, the type species of the nominal genus Histiopsis is H. atlantica, which has unpaired male organs and Histiopsis was subsequently placed in the synonomy of Histioteuthis (Voss,1969). Pfeffer (1900) described the genus Stigmatoteuthis, with type species S. hoylei (Goodrich 1896) by monotypy. (This is not the same species as Meleagroteuthis hoylei Pfeffer, 1900 which, according to Nesis, 1987, is a synonym of Histioteuthis meleagroteuthis.) Therefore Stigmatoteuthis Pfeffer 1900 is the valid-genus name designated for a species in this clade.
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