Descriptions nouvelles

A new species of Leporinus Agassiz, 1829 from the upper rio Paraná basin (characiformes, Anostomidae) with redescription of L. elongatus Valenciennes, 1850 and L. obtusidens (Valenciennes, 1837)

Par Heraldo A. Britski1 José Luís o. Birindelli1 Julio ces ArgaraVello
Leporinus obtusidens Valenciennes, 1837 and L. elongatus Valenciennes, 1850 are rede- scribed based on the type specimens, including those of their junior synonyms, and recently collected specimens. Leporinus obtusidens is considered to be widespread, occuring in the river drainages of La Plata, São Francisco, and Parnaíba. Leporinus aguapeiensis Campos, 1945, described from the upper Rio Paraná, and L. silvestrii Boulenger, 1902, described from the Rio Paraguay, are considered junior synonyms of L. obtusidens. Leporinus elongatus is endemic to the Rio Jequitinhonha and Rio Pardo, two eastern Brazilian river basins, and the locality cited for the lectotype, Rio São Fransico, likely to be erroneous. Leporinus crassilabris Borodin, 1929, and L. crassilabris breviceps Borodin, 1929, both described from the Rio Jequitin- honha, are considered junior synynoms of L. elongatus. A new species of Leporinus, endemic to the upper Rio Paraná, very similar and sometimes mistaken with L. obtusidens, is formally described. In addition, comments on Leporinus pachyurus Valenciennes, 1850 and on L. bi- maculatus Castelnau, 1855 are provided, and a lectotype for L. bimaculatus is selected.


Nouvelle espèce décrite : Leporinus piavussu du Rio Mogi Guaçu, at Cachoeira de Emas (21°55’35”S, 47°21’59”W), Pirassununga, São Paulo, 01-06 May 1963, Excursão do Departamento de Zoologia da Secretaria de Agricultura do Estado de São Paulo et du bassin du Rio Parana, Brésil.
Papéis Avulsos de Zoologia, 52(37), 2012

Andinoacara blombergi, a new species from the río Esmeraldas basin in Ecuador and a review of A. rivulatus (Teleostei: Cichlidae)

Nicklas Wijkmark, Sven O. Kullander and Ramiro E. Barriga Salazar

Andinoacara blombergi, new species, is described from the río Esmeraldas basin in northern Ecuador. It is distin- guished from the most similar species, A. rivulatus (Günther, 1860) by 25 vs. 24 scales in the E1 scale row, slightly higher average meristics, narrower head, and narrower interorbital space. Andinoacara rivulatus is rede- scribed on the basis of specimens from the Guayas, Túmbes and Zarumilla drainages in Ecuador and Peru. Aequidens azurifer Fowler, 1911 is a junior synonym of A. rivulatus. The syntypes of Acara aequinoctialis Regan, 1905 are also syntypes of A. rivulatus. A common lectotype is designated for A. rivulatus and A. aequinoctialis, making A. aequinoctialis a junior objective synonym of A. rivulatus.

Ichthyol. Explor. Freshwaters, Vol. 23, No. 2, pp. 117-137, 11 figs., 3 tabs., October 2012

Two new species of Melanorivulus from the Caiapós hill, upper Araguaia river basin, Brazil (Cyprinodontiformes: Rivulidae)

par Wilson J. E. M. Costa

Melanorivulus ubirajarai, new species, and Melanorivulus kunzei, new species, are described from the upper Araguaia river basin, central Brazil; both are considered as closely related to other species endemic from the same area. Melanorivulus ubirajarai shares with M. litteratus a unique colour pattern of caudal fin in females (short grey stripe between caudal spot and bar on the middle of the fin). Melanorivulus kunzei shares with M. kayapo a unique colour pattern of flank in males (irregular horizontal rows of red dots forming reticulate pattern). Melanorivulus ubirajarai is mainly distinguished from M. litteratus by having a distinct colour pattern of flank and dorsal fin in males, consisting of not overlapping chevron-like red oblique bars on the flank and rows of light grey spots on the dorsal fin in males, dorsal fin at vertical through the base of the 9th anal-fin ray, and 33-35 scales on the longi- tudinal series. Melanorivulus kunzei mainly differs from M. kayapo by having 29-30 caudal-fin rays and the presence of dark grey dots on the sub-distal portion of the dorsal fin and middle of caudal fin in males. The discovery of the two new species supports the recent report of a unique high species diversity of Melanorivulus in the area drained by rivers originating in the Caiapós hill. The combination of high species diversity with quick habitat loss makes rivulid species endemic to the Caiapós hill area highly threatened with extinction, deserving special concern.

Ichthyol. Explor. Freshwaters, Vol. 23, No. 3, pp. 211-218, 4 figs., 1 tab., November 2012