Mylossoma Eigenmann & Kennedy, 1903

Mateussi, Nadayca T. B., Oliveira, Claudio & Pavanelli, Carla S., 2018, Taxonomic revision of the Cis-Andean species of Mylossoma Eigenmann & Kennedy, 1903 (Teleostei: Characiformes: Serrasalmidae), Zootaxa 4387 (2), pp. 275-309 : 277-279

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Mylossoma Eigenmann & Kennedy, 1903


Mylossoma Eigenmann & Kennedy, 1903

Mylossoma Eigenmann & Kennedy, 1903: 530 [original description; type-species by monotypy Myletes albiscopus Cope, 1872 ].—Eigenmann, 1903: 148 [short diagnosis, etymology].— Norman, 1929: 812 [revision].— Gosline, 1951: 27 [brief description].— Géry, 1976: 48 [checklist of Serrasalmidae , key to genera].— Géry, 1977: 258 [comments on the genus].— Machado-Allison & Castillo, 1992: 1 –34 [morphological study on species from Venezuela].— Jégu, 2003: 187 [checklist of valid species, synonimical list].

Starksina Fowler, 1907: 476 [original description; type-species by monotypy Myletes herniarius Cope, 1872 ]. Mylosoma (sic). — Eigenmann, 1910: 444 [checklist].— Eigenmann, 1915: 261, 265 [diagnosis in key].

Diagnosis. Mylossoma can be distinguished from the remaining Serrasalmidae genera by a single exclusive character: convex edge of anal fin with median and posterior rays longer than anterior ones ( Fig. 1 View FIGURE1 ), and by the combination of the following non-exclusive characters: 1) absence of spine preceding the dorsal fin; 2) accessory scales covering intersection of main scales, mainly at the anterior portion of the body; 3) scales covering at least the first third of the anal fin; 4) adipose fin never rayed, entirely covered by scales in adults; 5) perforated lateral line scales with one, two or four perforations per scale; 6) two rows of robust teeth in the premaxilla ( Fig. 2 View FIGURE 2 ); 7) a pair of conical teeth behind the main dentary teeth row ( Fig. 2 View FIGURE 2 ); 8) highly developed spines in the ventral keel.

Remarks. Eigenmann & Kennedy (1903) did not provided a diagnosis for Mylossoma , but rather merely assigned Myletes albiscopus to this genus, indicating it as a new generic name, at a footnote. Shortly after, Eigenmann (1903) presented a brief diagnosis for the genus, comparing it with Colossoma . Eigenmann (1915) and Norman (1929), in their revisions of the Serrasalmidae , described several additional species of Mylossoma but the genus remained without a formal diagnosis until Gosline (1951).

Géry (1976) provided diagnosis and synonymic lists for the genera of Serrasalmidae , commented on the synonym of Starksina with Mylossoma , and in addition followed Norman (1929) in recognizing five valid Mylossoma species. Subsequently, Géry (1977) briefly commented the morphology, allometry, and distribution of the valid Mylossoma species, and provided a brief diagnosis for each of them.

A more detailed analysis of Mylossoma was presented by Machado-Allison & Castillo (1992) on a paper about the species of the genus occurring in Venezuela. These authors analysed allometry, ontogenetical changes in the color pattern, and recognized as valid only M. acanthogaster , M. aureum and M. duriventre . Jégu (2003) followed Machado-Allison & Castillo (1992) in recognizing only three valid species for the genus.

The genus Mylossoma has a broad geographical distribution, including the Lago Maracaibo basin in trans- Andean South America , and at the cis-Andean South America, throughout the Amazon basin, including the Tocantins-Araguaia system, and is also widely distributed in the rio Orinoco and at the La Plata basin, with the exception for the upper rio Paraná and upper rio Uruguai basin ( Fig. 3 View FIGURE3 ).












Mylossoma Eigenmann & Kennedy, 1903

Mateussi, Nadayca T. B., Oliveira, Claudio & Pavanelli, Carla S. 2018


Eigenmann & Kennedy, 1903 : 530
Norman, 1929 : 812
Gosline, 1951 : 27
Géry, 1976 : 48
Géry, 1977 : 258
Machado-Allison & Castillo, 1992 : 1
Jégu, 2003 : 187


Fowler, 1907 : 476
Eigenmann, 1910 : 444
Eigenmann, 1915 : 261