Multilocus phylogeny, diagnosis and generic revision of the Guiana Shield endemic suckermouth armoured catfish tribe Lithoxini (Loricariidae: Hypostominae) [Avalithoxus, Lithoxini]

  • Lujan, N.K.; Armbruster, J.W. & Lovejoy, N.R.

    Zitat

    Abstract


    With > 450 species, Hypostominae is the most species-rich subfamily of suckermouth armoured catfishes (Loricariidae). Both morphological and molecular analyses of Hypostominae strongly support monophyly of ten distinctively small-bodied (< 9 cm standard length), highly depressed (maximal head depth > 7.2 times in standard length) species comprising two currently valid genera (Exastilithoxus and Lithoxus) that are restricted to fast-flowing, rocky-bottomed rivers and streams draining the Guiana Shield in northwestern South America. We describe the tribe Lithoxini for this clade and present a multilocus phylogeny for eight Lithoxini species, including type species of all nominal genera and subgenera. Based on morphological and molecular data, we resurrect and redescribe the previously synonymized subgenus Paralithoxus for a strongly supported clade of eight species that are restricted to rivers south and east of Venezuela and have seven to nine interdorsal plates and five rows of plates on the caudal peduncle. We also erect the new genus Avalithoxus for Lithoxus jantjae, a species that is narrowly endemic to the Ventuari River immediately upstream of Salto Tencua and is unique in Hypostominae for having only 12 branched caudal-fin rays. Lithoxus is restricted to Lithoxus lithoides from the Essequibo and Correntyne rivers in Guyana and Suriname. A redescription of Paralithoxus bovallii based on recently collected specimens and an identification key to all four genera are also provided. Geographical distributions of Lithoxini clades suggest that geological uplift and geodispersal via stream capture played important roles in promoting vicariance and allopatric speciation.

    Quelle: Zoological Journal of the Linnean Society (Der vollständige Artikel ist kostenpflichtig)

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  • Änderungen in der Datenbank

    neue Gattung: Avalithoxus

    neue Zuordnung: Lithoxus jantjae -> Avalithoxus jantjae (Typusart)

    neuer Status und neu aufgenommen Lithoxina -> Lithoxini

    Mit Lithoxus/Avalithoxus jantjae wurde der einzige Lithoxus aus Venezuela in eine neue Gattung eingruppiert. Alle Lithoxus stammen nun aus den Guyanastaaten und dem nordöstlichen Brasilien (Bundesstaaten Amapá, Roraima, Pará nördlich des Amazonas)

  • Hi,

    wichtig erscheint, dass auch die Gattung Paralithoxus, Boesemann, 1982 re-validiert wurde. (-> in die Datenbank aufgenommen.)

    Dieser Gattung gehören nun folgende Arten an:

    wenn auch nicht explizt erwähnt. Der bei uns bekannte

    ist seinem Maul nach zu urteilen, auch unter Paralithoxus einzuordnen.

    Viele Grüße

    Elko