Abstract:
:Characidium iaquira, a new species from the upper rio Juruena, rio Tapajós basin, Brazil, is described. The new species can be promptly distinguished from all congeners by having a unique v-shaped dark mark lying along the caudal-fin extension, in medium- and large-sized specimens, and a remarkable iridescent green colouration in life. Characidium iaquira is closely related to Characidium crandellii and Characidium declivirostre by sharing unambiguous synapomorphies such as branchiostegal membranes united to each other across the isthmus, a scaleless area extending from the isthmus to the pectoral girdle, and dermal flaps surrounding anterior and posterior naris independent, but touching each other distally. Morphological specializations of the paired fins in the three riffle-dwellers species are discussed, including the wing-like shape, robustness, and inclination of the pectoral fin.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Zanata AM,Ohara WM,Oyakawa OT,Dagosta FCPdoi
10.1111/jfb.14485subject
Has Abstractpub_date
2020-11-01 00:00:00pages
1343-1353issue
5eissn
0022-1112issn
1095-8649journal_volume
97pub_type
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