Archiaphyosemion, RADDA, 1977

Costa, Wilson J. E. M., 2015, Comparative morphology, phylogeny, and classification of West African callopanchacine killifishes (Teleostei: Cyprinodontiformes: Nothobranchiidae), Zoological Journal of the Linnean Society 175 (1), pp. 134-149 : 138-140

ARCHIAPHYOSEMION RADDA, 1977

Archiaphyosemion Radda, 1977: 214 (proposed as a subgenus of Aphyosemion Myers, 1924 ; type species Aphyosemion guineense Daget, 1954 ; type by original designation).

Diagnosis

Distinguished from all other genera of the Callopanchacini by nine autapomorphies: fontal squamation E-patterned (11.1), versus G-patterned; dorsal process of the maxilla broad (18.1; Fig. 2A ), versus narrow ( Fig. 2B ); dorsal process of the autopalatine prominent (22.1; Fig. 2A ), versus minute ( Fig. 2B ); anterior dorsal condyle of the hyomandibula distinctively longer than posterior dorsal condyle (24.1; Fig. 2A ), versus approximately equal ( Fig. 2B ); cartilaginous portion of the basihyal about equal in length to osseous portion length (26.1; Fig. 3A ), versus longer ( Fig. 3B ); bifid proximal portion of the first epibranchial (30.1; Fig. 3A ), versus not bifid ( Fig. 3B ); second and third epibranchials longer than half the length of adjacent ceratobranchials (31.1; Fig. 3A ), versus shorter ( Fig. 3B ); bony flap adjacent to the articular head of the fourth ceratobranchial placed in a subproximal position (38.1; Fig. 3A ), versus proximal ( Fig. 3B ); and a short fifth ceratobranchial (40.1), with a row of broad teeth on the medial portion of the bone ( Fig. 3A ), versus fifth ceratobranchial long, with narrow, irregularly arranged teeth ( Fig. 3B ). Archiaphyosemion is similar to Callopanchax as species of both genera have long interarcual cartilage, longer than the first epibranchial (33.1; Fig. 3A ), versus shorter than the first epibranchial.

Included taxa

A single species: A. guineense ( Daget, 1954) .

Figures

Figure 2. Jaws, jaw suspensorium, and opercular series, left lateral view, of Archiaphyosemion guineense (A), and Callopanchax monroviae (B). Numbers in brackets are character states numbered according to Appendix S2. Larger stippling indicates cartilage. Scale bars = 1 mm.

Figure 3. Hyoid and branchial arches: ventral portion in dorsal view and dorsal portion in ventral view, of Archiaphyosemion guineense (A) and Callopanchax monroviae (B); urohyal, left lateral view, of A. guineense (C), and C. monroviae (D). Numbers in brackets are character states numbered according to Appendix S2. Larger stippling indicates cartilage. Scale bars: 1 mm.