Tetragonopterus ommatus
Tetragonopterus ommatus Silva, Melo, Oliveira & Benine, 2016
First described in: Silva, G. S. C.; Melo, B. F.; Oliveira, C.; Benine, R. C. (2016). Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species. <em>Zootaxa.</em> 4200(1): 1.
Descriptions from checklists and floras indexed by GBIF
description
Description. Morphometric data presented in Table 8. Body compressed and moderately elongate when compared with congeners. Greatest body depth at dorsal-fin origin. Dorsal profile slightly convex from snout tip to vertical through middle of orbit; straight from this point to end of occipital process; convex from that point to dorsal-fin origin; straight or slightly convex along dorsal-fin base to rear of adipose fin. Prepelvic region transversely flattened with distinct, longitudinally aligned lateral keels. Ventral profile slightly convex from lower lip to anal-fin origin; straight along base of anal fin. Caudal peduncle with concave dorsal and ventral profiles. Snout shorter than orbital diameter. Mouth terminal. Upper and lower jaw of similar size. Premaxillary teeth in two rows of relatively small teeth with sharp cusps. Outer row with 6 (1) or 7 (4) * teeth with three cusps, central cusp slightly longer. Inner row with 5 (4) * or 6 (1) teeth with four or five cusps, central cusp, when present, twice as long as the lateral cusps. Maxilla with 7 (1) * or 8 (4) teeth with three cusps. Dentary bearing 4 (5) * anteriormost teeth with four or five cusps. Dorsal-fin rays ii, 9 (5) *.
Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species
description
Tetragonopterus sp. Tapajós: Melo et al., 2016: 709 – 717 (molecular phylogeny).
Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species
diagnosis
Diagnosis. Tetragonopterus ommatus is distinguished from all congeners by the presence of 7 – 8 maxillary teeth (vs. 1 – 6) and by having a dark, vertically-oriented patch of dark pigmentation limited to the posterior portion of the caudal peduncle (vs. mark centered on the caudal peduncle). Tetragonopterus ommatus also differs from T. anostomus, T. denticulatus and T. kuluene by having 4 principal teeth on dentary (vs. 5 – 6) and by having more robust dentary teeth (vs. thinner and sharper teeth). Tetragonopterus ommatus differs from T. anostomus by having a terminal mouth (vs. subsuperior mouth) and by having two conspicuous humeral marks (vs. only one humeral mark). In addition, T. ommatus differs from T. anostomus and T. araguaiensis by the number of gill rakers on the lower (13 – 15) and upper (8 – 9) limbs of the first gill arch (vs. 17 – 20 and 10 – 12). Tetragonopterus ommatus is distinguished from T. argenteus by having 8 predorsal scales (vs. 11 – 17). It differs from T. carvalhoi by the presence of a rounded dark mark on the caudal peduncle (vs. a lozenge-shaped dark mark on the caudal peduncle). Tetragonopterus ommatus differs from T. rarus and T. georgiae by the presen
Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species
distribution
Distribution. Tetragonopterus ommatus is only known near the Cachoeira de São Luiz, middle Rio Tapajós, municipality of Itaituba, Pará Brazil (Fig. 2 b).
Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species
Where it has been recorded
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
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In the stacks
Searching the stacks…
Every page naming Tetragonopterus ommatus in the Biodiversity Heritage Library →
From the GBIF Backbone Taxonomy and occurrence records (GBIF.org), with Wikipedia and the Source Library. GBIF species 9015014.