Amphilius jacksonii

Thomson, Alfred W., Page, Lawrence M. & Hilber, Samantha A., 2015, Revision of the Amphilius jacksonii complex (Siluriformes: Amphiliidae), with the descriptions of five new species, Zootaxa 3986 (1), pp. 61-87 : 62

Amphilius jacksonii complex

The Amphilius jacksonii complex differs from all other species of the genus ( A. atesuensis , A. brevis , A. caudosignatus , A. dimonikensis , A. grammatophorus , A. kakrimensis , A. korupi , A. lamani , A. longirostris , A. maesii , A. mamonekenensis , A. nigricaudatus , A. opisthophthalmus , A. platychir , A. pulcher , A. rheophilus ) except A. lentiginosus by its mottled body coloration that includes dark saddles that are joined to one another laterally (vs. body mottled, dark saddles not joined laterally). It differs from A. lentiginosus by having the head and body without spots (vs. head and body heavily spotted) and by having fewer total gill rakers on the first gill arch (6–11, rarely 5 or 12 vs. 14–16). The A. jacksonii complex further differs from A. longirostris and A. opisthophthalmus by having 6+7 principal caudal-fin rays (vs. 7+8) and a well developed crenelated epidermal fold (vs. rudimentary fold), and further differs from A. brevis , A. dimonikensis , A. korupi , and A. maesii by having distinct crenelations on the epidermal fold (vs. crenelations absent or very weak). It further differs from A. grammatophorus , A. kakrimensis , A. platychir , and A. rheophilus by having the lobes formed by epidermal fold crenelations rounded, Fig. 1 A (vs. lobes formed by epidermal fold crenelations elongated and pointed, Fig. 1 B) and from A. brevis , A. caudosignatus , A. dimonikensis , A. korupi , A. lamani , A. maesii , A. mamonekenensis , A. nigricaudatus , and A. pulcher by having fewer branchiostegal rays (usually 6–8, rarely 5 or 9 vs. 9–10 in A. pulcher , more than 9 in the other species).

Figures

FIGURE 1. Epidermal fold of Amphilius species. A: Crenelations rounded (Amphilius lujani, UF 184238). B. Crenelations pointed (Amphilius grammatophorus, AMNH 248684).