Moenkhausia doceana

biology_ecology

Ecological notes. Moenkhausia doceana inhabits second and third order streams, about two to three meters wide and 0.5 to 1.6 meters deep, characterized by clear water and moderate to fast current, sandy bottom with gravel, and riparian surrounding vegetation. The fishes were captured in the water column, mainly near the surface. It is an invertivore that eats aquatic insect larvae (e. g., Chironomidae), nymphs (e. g., Ephemeroptera), and fragments of terrestrial arthropods (ants, beetles, and spiders). Moenkhausia doceana occurs syntopically with Characidium aff. fasciatum Reinhardt, Hoplias malabaricus (Bloch), Astyanax aff. intermedius Eigenmann, Astyanax aff. lacustris (Lütken), Hyphessobrycon bifasciatus Ellis, Trichomycterus pradensis Sarmento-Soares, Martins-Pinheiro, Aranda & Chamon, Corydoras nattereri Steindachner, Pimelodella aff. vittata (Lütken), Poecilia vivipara Bloch & Schneider, and Geophagus brasiliensis (Quoy & Gaimard) (Sarmento-Soares & Martins Pinheiro, 2013). Moenkhausia doceana was recorded in conservation units such as the Parque Estadual do Rio Doce (PERD), Minas Phylogenetic reconstruction. Phylogenetic analysis, according to implied weighting procedures (

Redescription of Moenkhausia doceana (Steindachner, 1877) (Ostariophysi: Characiformes): a characid from the Northeastern Mata Atlântica ecoregion, Brazil

description

Description. Morphometric data are summarized in Table 2. Body compressed, moderately long and high, greatest body depth at vertical through dorsal-fin origin. Dorsal profile of head convex from tip of upper jaw to vertical through anterior nostril; slightly concave or straight from that point to tip of supraoccipital spine. Dorsal profile of body slightly convex from posterior tip of supraoccipital spine to base of first dorsalfin ray, and straight that point to adipose-fin origin. Ventral profile of body convex from tip of lower jaw to pelvic-fin origin, straight or slightly convex from that point to anal-fin origin, and straight and posterodorsally slanted along of analfin base. Dorsal and ventral profile of caudal peduncle straight to slightly concave. Mouth terminal, premaxillary and dentary approximately the same size. Maxilla extending posteroventrally to first onethird of orbit, almost reaching tip of second infraorbital, approximately at 45 degrees angle relative to longitudinal axis of body. Main axis of maxilla straight, with approximately same width along entire length. Nostrils close to each other, anterior opening small and circular, posterior opening twice in size an

Redescription of Moenkhausia doceana (Steindachner, 1877) (Ostariophysi: Characiformes): a characid from the Northeastern Mata Atlântica ecoregion, Brazil

description

of laterosensory canal of preopercle and suprapreopercle not overlapping anterodorsal process of opercle; ch. 109: 1 - ventral margin of horizontal process of anguloarticular perpendicular to laterosensory canal of dentary from medial view; ch. 135: 1 - two or more maxillary teeth; ch. 225: 0 - abdominal ribs on anterior caudal vertebrae absent; ch. 281: 0 - seven or fewer supraneurals; ch. 305: 0 - anterior ventral procurrent caudal-fin rays paired, only distally fused; ch. 315: 1 - bony hooks on first pelvic-fin ray of adult males present; ch. 340: 1 - insertion of pterotic aponeurosis on a lobe situated dorsal to horizontal semicircular canal.

Redescription of Moenkhausia doceana (Steindachner, 1877) (Ostariophysi: Characiformes): a characid from the Northeastern Mata Atlântica ecoregion, Brazil

diagnosis

Diagnosis. Moenkhausia doceana is promptly distinguished from all congeners [except M. affinis (Steindachner), M. barbouri Eigenmann, M. dorsinuda Zarske & Géry, M. jamesi Eigenmann, M. justae Eigenmann, M. latissima Eigenmann, M. levidorsa Benine, M. margitae Zarske & Géry, M. moisae Géry, Planquette & Le Bail, M. newtoni, M. simulata (Eigenmann), M. tergimacula Lucena & Lucena] by a long anal fin, with 29 - 34 (mode 32) branched rays (vs. 28 or less in others species). Moenkhausia doceana differs from the aforementioned species, except M. tergimacula, by having 4 - 7 (mode 5) maxillary teeth (vs. 3 or less). Lastly, M. doceana differs of M. tergimacula by having 7 - 8 (mode 7) scale rows above lateral line and no marks anteriorly to dorsal-fin origin (vs. 5 ½ scales rows above lateral line and presence of a distinct dark, saddle-like mark on the body immediately anterior to dorsal-fin origin).

Redescription of Moenkhausia doceana (Steindachner, 1877) (Ostariophysi: Characiformes): a characid from the Northeastern Mata Atlântica ecoregion, Brazil