June 13, 2011
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, 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.
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.
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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