Moenkhausia lineomaculata

description

Description. Morphometric data presented in Table 1. Body compressed, moderately elongate. Greatest body depth slightly anterior to dorsal-fin origin. Dorsal profile of head convex from upper lip to vertical through posterior nostril; slightly convex from that point to tip of supraoccipital spine. Dorsal profile of body convex along predorsal region, straight along dorsal-fin base, straight or slightly convex from terminus of dorsal-fin base to adipose-fin origin, and concave from the latter point to origin of dorsal procurrent caudal-fin rays. Ventral profile of head and body convex from tip of lower lip to pelvic-fin origin, concave from that point to anal-fin origin, straight along anal-fin base, and concave from that point to origin of ventral procurrent caudal-fin rays. Jaws equal, mouth terminal. Premaxillary teeth in two distinct rows (fig. 3). Outer row with 3 (3), 4 * (26) or 5 (1) tricuspid teeth. Inner row with 5 * (25) tri- to pentacuspid teeth. Posterior tip of maxilla at vertical through posterior portion of second infraorbital. Maxilla with 2 (10), 3 (19), or 4 (1) tri- to pentacuspid teeth. Dentary with 4 * (30) larger pentacuspid teeth followed by a series of 9 – 1

A new species of Moenkhausia Eigenmann (Characiformes: Characidae) from the upper rio Juruena basin, Central Brazil

diagnosis

Diagnosis. Moenkhausia lineomaculata is readily distinguished from all congeners, except M. cosmops Lima, Britski & Machado, M. cotinho Eigenmann, M. diktyota Lima & Toledo-Piza, M. forestii Benine, Mariguela & Oliveira, M. oligolepis (Günther), M. sanctaefilomenae (Steindachner), and M. pyrophthalma Costa by the presence of a reticulated color pattern on body formed by dark pigmentation on the posterior portion of the scales (vs. absence). It is further distinguished from all congeners, except M. cosmops, M. cotinho, M. forestii, M. oligolepis, M. sanctaefilomenae, and M. pyrophthalma by the presence of a light area preceding the dark caudalpeduncle blotch (vs. absence). The new species is distinguished from all the aforementioned species, except M. cotinho, by the presence of longitudinal series of dark dots on body (vs. absence), and from M. cotinho by the humeral blotch evenly pigmented along its length (vs. dorsal portion of the humeral blotch distinctly darker, fig. 5) and by having the longitudinal line formed by subjacent dark pigmentation along horizontal septum starting approximately at the vertical through dorsal-fin origin (vs. starting slightly posterior to the humeral

A new species of Moenkhausia Eigenmann (Characiformes: Characidae) from the upper rio Juruena basin, Central Brazil

etymology

Etymology. The specific name “ lineomaculata ” comes from the Latin lineo meaning line, and maculata meaning spotted, in allusion to the longitudinal series of aligned spots characteristic of the new species. An adjective.

A new species of Moenkhausia Eigenmann (Characiformes: Characidae) from the upper rio Juruena basin, Central Brazil

materials_examined

Holotype. MZUSP 117108, 67.8 mm SL, Campos de Júlio, rio Juruena at Fazenda Tiroleza, upper rio Tapajós basin, Mato Grosso State, Brazil, 14 º 16 ’ 37 ” S 59 º 5 ’ 22 ” W, K. de Silimon, 19 Sep 2006. Paratypes. All from Mato Grosso State, Brazil, upper rio Tapajós basin. MZUSP 105953, 3, 14.8 – 36.6 mm SL, Campos de Júlio, rio Juruena at Fazenda Tiroleza, upstream to the airport, 14 º 15 ’ 47 ” S 59 º 5 ’ 25 ” W, K. de Silimon, 19 Sep 2006. MZUSP 106316, 2, 23 – 66.7 mm SL, same data as holotype. MZUSP 106320, 2, 19.5 – 27.1 mm SL, Campos de Júlio, swamp between rio Juruena and Cabeceira stream, upstream to the bridge at BR – 364 road, 14 º 39 ’ 43 ” S 59 º 6 ’ 27 ” W, K. de Silimon, 18 Sep 2006. MZUSP 106322, 3, 18.6 – 23.5 mm SL, INPA 48035, 3, 26 – 36.5 mm SL, USNM 427200, 3, 26.1 – 38.5, Campos de Júlio, rio Juruena at Fazenda Tiroleza, 14 º 16 ’ 38 ” S 59 º 5 ’ 22 ” W, K. de Silimon, 19 Sep 2006. MZUSP 106324, 4, 17.7 – 32.4 mm SL, Campos de Júlio, rio Juruena, stream upstream to the bridge at BR – 364 road, 14 º 39 ’ 43 ” S 59 º 6 ’ 27 ” W, K. de Silimon, 17 Sep 2006. MZUSP 106325, 1, 35.5 mm SL, Sapezal, rio Juruena at left margin, upstream to the PCH (Small hydropower plant

A new species of Moenkhausia Eigenmann (Characiformes: Characidae) from the upper rio Juruena basin, Central Brazil