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Zootaxa round-up

Home Forums Ichthyology Zootaxa round-up

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    Matt
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    Zootaxa 3869(3)

    Parachiloglanis bhutanensis, a new species of torrent catfish (Siluriformes: Sisoridae) from Bhutan

    Parachiloglanis bhutanensis is a newly discovered species of torrent catfish from eastern Bhutan. With its discovery, the
    genus Parachiloglanis is no longer monotypic. The species differs from Parachiloglanis hodgarti in meristic, mensural,
    and coloration characters. Parachiloglanis bhutanensis is confirmed as a member of the genus by the absence of a postlabial
    groove on the lower lip, which is present in other genera of the subfamily Glyptosterninae (as either complete or incomplete).
    It is diagnosed within the genus by the presence (versus absence) of a series of 35–40 large white pores along
    the lateral line, a tall adipose fin (roughly two times the height of the adipose fin in P. hodgarti), a less dorsoventrally
    flattened body than P. hodgarti, a deeper head, wider mouth, longer inner- and outer-mandibular barbels, a truncate (versus
    indented to lunate) caudal fin, and the absence (versus presence) of black and white pigmentation on the caudal fin.

    Zootaxa 3869(4) – OPEN ACCESS

    Apistogramma ortegai (Teleostei: Cichlidae), a new species of cichlid fish from the Ampyiacu River in the Peruvian Amazon basin

    Apistogramma ortegai, new species, is described from small streams tributaries of the Ampiyacu River near Pebas, in eastern
    Peru. It belongs to the Apistogramma regani species group and is distinguished from all other species of Apistogramma
    by the combination of contiguous caudal spot to bar 7, presence of abdominal stripes, short dorsal-fin lappets in both sexes,
    absence of vertical stripes on the caudal fin, and reduced number of predorsal and prepelvic scales.

    Zootaxa 3869(4)

    A review of the glyptosternine catfish genus Exostoma Blyth 1860 from Thailand, with descriptions of two new species (Teleostei: Siluriformes)

    We review members of the sisorid catfish genus Exostoma known from Thailand. Three species are recognized, of which
    two from the headwaters of the Chao Phraya River drainage in northwestern Thailand, are described here as new: E. effrenum
    and E. peregrinator. In addition to the two new species, E. berdmorei (which is here redescribed) is also known
    from the Salween River drainage in western Thailand. The three species can be distinguished from each other and other
    congeners by the morphologies of the adipose and caudal fins, as well as morphometric data for the eye diameter, head
    width, dorsal-to-adipose distance, body depth at anus, caudal-peduncle length, caudal-peduncle depth, and numbers of
    branched pectoral-fin rays and preanal vertebrae.

    Zootaxa 3872(2)

    A new Hyphessobrycon (Ostariophysi: Characiformes: Characidae) from the middle Amazon basin, Brazil

    Hyphessobrycon montagi, new species, is described from tributaries of the Rio Arapiuns, a left margin affluent of the lower
    Rio Tapajós, Amazon basin, Pará, Brazil. The new species can be diagnosed from all its congeners by the possession
    of a combination of two well-defined humeral blotches, connected by a narrow stripe, and a caudal peduncle blotch. A
    putatively monophyletic Hyphessobrycon heterorhabdus species-group, restricted to H. heterorhabdus, H. amapaensis,
    and H. eschwartzae, is herein proposed based on shared derived features of color pattern. Alternative proposals of a “Hyphessobrycon heterorhabdus group” presented in the recent literature are evaluated and criticized.

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