344 research outputs found
Diplodus levantinus (Teleostei: Sparidae), una nueva especie de sargo del Mediterráneo sudeste frente a Israel, con una lista de especies y una clave de clasificación de las especies del grupo Diplodus sargus
The sea bream Diplodus levantinus n. sp. is described from off the coasts of Israel in the eastern Mediterranean Sea, where it replaces Diplodus sargus (Linnaeus, 1758). The new species is characterized by 11-12 spines and 10-16 soft rays in the dorsal fin, 3 spines and 11-13 soft rays in the anal fin, 15-17 pectoral fin rays, 6-9 + 8-12 gill rakers on the first gill arch, upper and lower jaws with a single row of 4 incisors on each side, followed by a total of 16-19 molariform teeth in the upper jaw and 12-14 molariform teeth in the lower jaw, with the molariforms of the upper jaw separated from the incisors by a wide, toothless gap, and the sides of the body in adults with 8 vertical bars of equal width which are present even in large adults, followed by a broad bar on the caudal peduncle which usually nearly reaches the ventral margin of the caudal peduncle. An updated checklist of the species of the genus Diplodus, and a key to species of the Diplodus sargus species group from the eastern Atlantic and Mediterranean Sea, are presented.El sargo levantino Diplodus levantinus n. sp. se describe a partir de ejemplares de las costas de Israel, en el Mediterráneo oriental, donde reemplaza a Diplodus sargus (Linnaeus, 1758). La nueva especie se caracteriza por: 11-12 espinas y 10-16 radios blandos en la aleta dorsal, 3 espinas y 11-13 radios blandos en la aleta anal, 15-17 radios en las pectorales, 6-9 + 8-12 branquispinas en el primer arco branquial; las mandíbulas superior e inferior con una sola fila de 4 incisivos en cada lado, seguidos por un total de 16-19 molares en la mandíbula superior y 12-14 molares en la mandíbula inferior, con los molares de la mandíbula superior separados de los incisivos por una gran distancia sin dientes; los lados del cuerpo, en los adultos, con 8 bandas verticales de igual anchura, presentes incluso en adultos de gran tamaño, seguidas de una amplia banda en el pedúnculo caudal que, por lo general, casi alcanza el margen ventral del pedúnculo caudal. Se diferencia principalmente de D. sargus por el menor número de dientes molares en las mandíbulas superior e inferior, y por la amplia separación, sin dientes, entre molares e incisivos de la mandíbula superior. Se presenta una lista actualizada de las especies del género Diplodus y una clave para las especies del grupo de especies Diplodus sargus del Atlántico este y el Mediterráneo
A new species of Aspidoras (Siluriformes: Callichthyidae) from a small coastal drainage in northeastern Brazil
A review of the Cis-Andean species of Hemibrycon Günther (Teleostei: Characiformes: Characidae: Stevardiinae), with description of two new species
Phylogenetic relationships of the north-eastern Atlantic and Mediterranean blenniids
The phylogenetic relationships of 27 north-eastern Atlantic and Mediterranean blennioids are analysed based on a total of 1001 bp from a combined fragment of the 12S and 16S mitochondrial rDNA. The most relevant results with implications in current blenniid taxonomy are: (1) Lipophrys pholis and Lipophrys (= Paralipophrys) trigloides are included in a well-supported clade that by the rule of precedence must be named Lipophrys; (2) the sister species of this clade are not the remaining species of the genus Lipophrys but instead a monotypic genus comprising Cory-phoblennius galerita; (3) the smaller species of Lipophrys were recovered in another well-supported and independent clade, which we propose to be recognized as Microlipophrys; (4) although some authors included the genera Salaria and Lipophrys in a single group we have never recovered such a relationship. Instead, Salaria is more closely related to the genera Scartella and Parablennius; (5) the genus Parablennius, which was never recovered as a monophyletic clade, is very diverse and may include several distinct lineages; (6) the relative position of Aidablennius sphynx casts some doubts on the currently recognized relationships between the different blenniid tribes. Meristic, morphological, behavioural and ecological characters support our results and are also discussed. The possible roles of the tropical West African coast and the Mediterranean in the diversification of blenniids are discussed. (c) 2005 The Linnean Society of London.info:eu-repo/semantics/publishedVersio
Redescription of Leporinus jamesi (Characiformes: Anostomidae), a poorly known species of Leporinus from the lowlands of the central Amazon, Brazil
Trichomycterus venulosus (Steindachner, 1915), a junior synonym of Eremophilus mutisii Humboldt, 1805 (Siluriformes: Trichomycteridae) and not an extinct species
Taxonomic review of Colombian Parodon (Characiformes: Parodontidae), with descriptions of three new species
Redescription of Corydoras guapore Knaack, 1961 (Siluriformes: Callichthyidae), a midwater Corydoradinae species from the rio Guaporé basin
New species of Eugerres from the Usumacinta Province, México and Guatemala with a redescription of E. mexicanus (Steindachner, 1863) (Teleostei: Gerreidae)
Distribution of Eurasian minnows ( Phoxinus
The Eurasian minnows of the genus Phoxinus are small cyprinid species, widely distributed across Europe and Asia. Currently, there are at least 15 species in Phoxinus, with preliminary data suggesting more to be described. Despite the discernible increase in research integrating molecular phylogenetic approaches with traditional taxonomy and systematics, inter- and intraspecific relationships in the genus Phoxinus are still poorly known. The aims of this research were to: (i) compile data on the distribution of Phoxinus species in Croatia and Bosnia and Herzegovina from the sampling conducted by authors from 2006 to 2016 and from literature sources, and (ii) provide a detailed insight on distribution ranges of genetic clades and species of Phoxinus in the western Balkans. Additional 118 localities in Croatia and 8 locations in Bosnia and Herzegovina were added to already known 160 localities from the literature data. Molecular analyses of mitochondrial DNA indicate: (i) the presence of Phoxinus marsilii in Croatia (Drava drainage, the Papuk Mountain), around 260 km south of its known distribution range in Hungary, and (ii) an exceptional genetic variability of P. lumaireul in the Western Balkans
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