New synapomorphies for Rhamphichthys Muller & Troschel, 1848 (Teleostei: Rhamphichthyidae)
DOI:
https://doi.org/10.35699/2675-5327.2005.22023Keywords:
systematics, cladistics, electric fish, freshwater, Neotropical region, Rhamphichthys, Steatogenys, SternopygusAbstract
Seven new synapomorphies are presented for Rhamphichthys, a neotropical genus of freshwater electric fishes: (1) dark, oblique, transverse bars on body flank prolonged through the anal fin (also as a homoplasy in Steatogenys – Hypopomidae); (2) ventral branches of the body lateral line, near head, elongate (also as a homoplasy in Sternopygus – Sternopygidae); (3) presence of a fleshy skin fold on the body wall, inside the opercular opening; (4) first scale row, below the lateral line, composed of elongate scales, oblique to the body axis; (5) scales of the lateral line and series of scales juxtaposed above and below them, deeply immersed in the skin; (6) dark oblique transversal bars on the body interrupted dorsally and (7) 306 to 461 rays in the anal fin. The presence of a thick, fibrous, and opaque gas bladder, cannot be considered as an apomorphy of Rhamphichthys.
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