From Parenti 1981:

REMARKS: Fundulopanchax contains species previously assigned to Aphyosemion that are more closely related to Nothobranchius than to the more primitive species of Aphyosemion. This usage of the genus Fundulopanchax differs from that of Loiselle and Glasgow (1971) who limited the group to large forms such as sjoestedti. The designation of a type species for the genus Callopanchax as A. occidentale by the International Commission places the genus Roloffia as an objective synonym of Callopanchax.

This decision has been rejected by many aquarists who believe that Myers (1924b) had either sjoestedti or another species in hand when he named the subgenus Callopanchax, with sjoestedti as the type, even though giving a description of occidentale. It is interesting to note that the sole lot catalogued as sjoestedti in the collection of the AMNH is an aquarium lot of occidentale.

Therefore, it is likely that Myers had specimens of occidentale not sjoestedti in hand when naming Callopanchax.

SUBGENUS CALLOPANCHAX MYERS
Callopanchax Myers, 1933c, p. 184 (type species Aphyosemion occidentale Roloff, by monotypy [proposed as a subgenus]).
Roloffia Clausen, 1966, p. 388 (type species Aphyosemion occidentale Roloff, by original designation).

SUBGENUS RADDAELLA HUBER
Raddaella Huber, 1977, p. 8 (type species Fundulus batesi Boulenger, by original designation [proposed as a subgenus]).
MATERIAL EXAMINED: F. sjoestedti:
Aquarium material: AMNH 21575 (4+/4); F. gardneri: Ghana: SU 64693 (l*/7); F. gulare: Aquarium material: AMNH 20563 (3+/13); F. arnoldi: Nigeria: Port Harcourt: AMNH 21570 (1+/1). F. occidentale: Aquarium material: AMNH 14611 (2*/6).