Jundia Leaffish

description

Description. Meristic and morphometric data are shown in Table 1. Body ellipsoid in lateral view, slightly elongate; noticeably compressed and ellipsoid in cross section at median of body length. Dorsal profile convex in long curve with upward slope in predorsal region, continuing in downward convex arc along dorsal-fin base to posteriormost ray. Ventral profile almost straight from lower lip to isthmus, posteriorly arched, slightly convex, from that point to anal-fin origin, becoming slightly more pronounced from anal-fin base to last ray. Caudal peduncle compressed, short, deep; straight in both dorsal and ventral profiles. Head in dorsal view, broad and rounded; obtuse in lateral profile. Males in reproductive state with discrete adipose gibbosity in occipital region. Snout broad, short, obtuse. Mouth wide, protractile, terminal, isognathous, and directed obliquely dorsally; anterior extremity at half of head depth, bordered by thin lips. Dentigerous plate with villiform teeth on premaxilla from anterior margin up to one quarter of ascending process; villiform teeth on dentary from inner edge of mandibular symphysis to angulo articular. Ascending process of premaxilla half lengt

A new species of leaffish Polycentrus Müller & Troschel, 1849 (Percomorpha: Polycentridae) from the rio Negro, Brazil

diagnosis

Diagnosis. Polycentrus jundia is distinguished from P. schomburgkii by: diagonal upper postorbital band being shorter than orbital diameter (Fig. 2 A) vs. longer (Fig. 2 B); presence of the median postorbital horizontal band (vs. absence); subocular band being shorter than orbital diameter (Fig. 2 A) (vs. length of subocular band equal to or greater than orbital diameter (Fig. 2 B )); snout blunt (vs. protruding); mouth isognathous (vs. prognathous); serrations absent on lower edge of lacrimal or two tiny serrations at the posterior end (vs. 8 - 14 conspicuous serrations distributed throughout the lower edge); posterior edge of vertical arm of preopercle fully serrated (vs. smooth edge); presence of five pungent opercular spines, the three dorsalmost largest (vs. one or two short spines); subopercle widely serrated along most of the edge (vs. no serrations); cleithrum with serrations on posterior dorsal margin (vs. no serrations); interopercle with widely serrated edge (vs. clusters of three to five serrations along the edge of varying position between individuals); fourth pectoral-fin ray reaching vertical through anal-fin origin (vs. reaching vertical from spine III or IV of anal

A new species of leaffish Polycentrus Müller & Troschel, 1849 (Percomorpha: Polycentridae) from the rio Negro, Brazil

distribution

Distribution. Polycentrus jundia is known from floodplain igarapés of the lower and upper rio Negro (Fig. 4).

A new species of leaffish Polycentrus Müller & Troschel, 1849 (Percomorpha: Polycentridae) from the rio Negro, Brazil

etymology

Etymology. The epithet “ jundia ” comes from the Tupi word “ jundiá ” meaning “ head with spine ”, and refers to the large amount of serrations present on the head bones of the new species. Treated here as a noun in apposition.

A new species of leaffish Polycentrus Müller & Troschel, 1849 (Percomorpha: Polycentridae) from the rio Negro, Brazil