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Aqua 19(4)

Home Forums Ichthyology Aqua 19(4)

This topic contains 0 replies, has 1 voice, and was last updated by  Matt 4 years, 2 months ago.

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  • #303010

    Matt
    Keymaster

    Rivulus tomasi (Teleostei: Cyprinodontiformes: Rivulidae), a new killifish from Tobogán de la Selva, middle Orinoco river drainage in the Amazonas Territory, southwest Venezuela

    Abstract

    Rivulus tomasi is described from Tobogán da la Selva, a tributary of the middle Rio Orinoco south of Puerto Ayacucho in the Amazonas Territories, southwest Venezuela. It is similar to R. amanapira, R. rectocaudatus, R. tecminae and R. staecki in having a truncate caudal fin, but differs by a unique combination of character states: tip of pelvic fin reaching between base of 4th and 5th anal fin ray in males, and 39-42 scales in longitudinal series. Rivulus tomasi differs from other Rivulus spp. (except R. amanapira and R. uakti) by unique caudal fin coloration.

    Two new endemic species in the Midas cichlid species complex from Nicaraguan crater lakes: Amphilophus tolteca and Amphilophus viridis (Perciformes, Cichlidae)

    Abstract

    The Neotropical Midas cichlid species complex (Amphilophus citrinellus Günther 1864) has become a model system for investigating the mechanisms of speciation and adaptive radiation. In several instances ancestral Midas cichlids from the great Nicaraguan lakes have colonized nearby crater lakes where they continued to evolve in isolation. Each crater lake can be seen as a “natural experiment” of sympatric and allopatric divergence. Several ecologically and genetically well-differentiated crater lake species have already been identified, but the species complex is not fully taxonomically resolved. Here, two new endemic Nicaraguan crater lake cichlids species are described: Amphilophus tolteca n. sp., a slender-bodied species which is endemic to the ca. 1,245 year old Lake Asososca Managua andAmphilophus viridis n. sp., an endemic benthic species from Lake Xiloá. Amphilophus tolteca morphologically resembles previously described limnetic species from the crater lakes Apoyo and Xiloá with a depressed, elongated body. However, A. tolteca is geographically isolated and genetically distinct from those species and from the putative generalist ancestral species. Amphilophus viridis resembles the Xiloá species A. amarillo in terms of body shape, but is distinct in coloration and ecology, and is genetically differentiated from all other syntopic species.

    New record of the convict cichlid, Amatitlania nigrofasciata (Günther, 1867), from the Middle East (Actinopterygii: Cichlidae)

    Abstract

    This paper reports the first record of a population of the Neotropical convict cichlid, Amatitlania nigrofasciata (Günther, 1867) from Iran, the second record of this species from the Middle East and the only known extant wild population in the region. This new record is based on collection of eight specimens of a leucistic strain of A. nigrofasciata taken from Golabi Spring, a fresh warmwater site in the Kol River (Hormuzgan basin). Source of the population is most likely due to releases by local people. Specimens captured included small and large individuals, indicating possible establishment.

    #352123

    Chromaphyo
    Participant

    Many thanks Matt

    #352129

    Florent
    Participant
    #352133

    Matt
    Keymaster

    Brilliant, thanks Florent!

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