Cambeva, Katz, Axel Makay, Barbosa, Maria Anais, attos, Jose Leonardo de Oliveira & osta, Wilson Jose Eduardo Moreira da, 2018

Katz, Axel Makay, Barbosa, Maria Anais, attos, Jose Leonardo de Oliveira & osta, Wilson Jose Eduardo Moreira da, 2018, Multigene analysis of the catfish genus Trichomycterus and description of a new South American trichomycterine genus (Siluriformes, Trichomycteridae), Zoosystematics and Evolution 94 (2), pp. 557-566 : 557

Cambeva gen. n.

Type species.

Pygidium davisi Haseman, 1911 (Fig. 3)

Diagnosis.

Cambeva is similar to Scleronema and distinguished from all other genera of the Trichomycterinae by the presence of a bony flap covering the posterior segment of the maxillo-dentary ligament channel in the dentary (Fig. 4B, D, F, G vs. flap absent, Fig. 4A, C, E; see also Arratia 1998: fig. 9a). Cambeva also differs from most Trichomycterinae except Scleronema by the presence of a short interopercle, shorter than the opercle (Fig. 5B, D, F, G; vs. longer, Fig. 5A, C, E; see also Arratia 1998: fig. 9b, Schaefer & Fernández 2009: fig. 3, Adriens et al. 2010: fig. 5 c,d), a deep constriction on the basal portion of the antero-dorsal arm of the quadrate in lateral view, its width less than 50% quadrate width at its dorsal limit (Fig. 5B, D, F, G; vs. more than 50%, Fig. 5A, C, E; see also Arratia 1990b: fig. 10a-c, Arratia 1998: fig. 8a, b), and absence of teeth in the coronoid process of the dentary (vs. presence), (Fig. 4B, D, F, G, Arratia 1998: fig. 9a). Cambeva differs from Scleronema by having the maxilla shorter than the premaxilla (maxilla with 30-60% length of premaxilla (Fig. 6A) vs. 90% or more (Fig. 6B, C)), absence of a transverse skin fold between the anterior nostrils and the maxillary barbel (vs. presence), 4-6 abdominal vertebrae (vs. 1-3), and absence of a fleshy projection posteriorly extending to opercular patch of odontodes (vs. presence). Cambeva is also distinguished from Ituglanis by possessing the cranial fontanel extending from the medial posterior of frontal to the medial region of supraoccipital (vs. restricted to the posterior region of the parieto-supraoccipital) (Costa & Bockmann 1993: fig. 3A), absence of the postorbital process of the sphenotic-prootic-pterosphenoid (vs. presence of an anteriorly directed postorbital process on the sphenotic-prootic-pterosphenoid) (Costa & Bockmann 1993: fig. 3A, B) and a smooth medial rim of the autopalatine (vs. deeply concave) (Costa & Bockmann 1993: Fig. 6).

Included species.

Cambeva davisi (Haseman, 1911), Cambeva iheringi (Eigenmann, 1917), Cambeva zonata (Eigenmann, 1918), Cambeva brachykechenos (Ferrer & Malabarba, 2013), Cambeva castroi (de Pinna, 1992), Cambeva cubataonis (Bizerril, 1994), Cambeva diatropoporos (Ferrer & Malabarba, 2013), Cambeva poikilos (Ferrer & Malabarba, 2013), Cambeva variegata (Costa, 1992). Other species, not included in the molecular analysis but exhibiting generic morphological diagnostic character states and congruent geographical distribution are: Cambeva stawiarski (Miranda Ribeiro, 1968), Cambeva balios (Ferrer & Malabarba, 2013), Cambeva concolor (Costa, 1992), Cambeva crassicaudata (Wosiacki & de Pinna, 2008), Cambeva diabola (Bockmann, Casatti & de Pinna, 2004), and Cambeva naipi (Wosiacki & Garavello, 2004). The following species, were not examined or lack the necessary osteological information on their original descriptions, but have the general external appearance and occur in the same basins that Cambeva is distributed, so they are tentatively included in the new genus: Cambeva paolence (Eigenmann 1917), Cambeva guaraquessaba (Wosiacki, 2005), Cambeva igobi (Wosiacki & de Pinna, 2008), Cambeva mboycy (Wosiacki & Garavello, 2004), Cambeva pascuali (Ochoa, Silva, Silva, Oliveira & Datovo, 2017), Cambeva perkos (Datovo, Carvalho & Ferrer, 2012), Cambeva plumbea (Wosiacki & Garavello, 2004), Cambeva tropeiro (Ferrer & Malabarba, 2011), Cambeva tupinamba (Wosiacki & Oyakawa, 2005), and Cambeva ytororo ( Terán, Ferrer, Benitez, Alonso, Aguilera & Mirande, 2017).

Distribution.

Species of Cambeva gen. n. occur in the Paraná, São Francisco, Ribeira de Iguape, and Uruguay river basins, as well as in smaller isolated coastal river basins of south-eastern and southern Brazil.

Etymology.

Cambeva , probably derived from the Tupi-Guarani, is a popular name for trichomycterid fishes in southern and south-eastern Brazil. Gender: feminine.