Skip to main content

Ontogenetic allometries and shape changes in the suckermouth armoured catfish Ancistruscf.triradiatus Eigenmann (Loricariidae, Siluriformes), related to suckermouth attachment and yolk-sac size

Buy Article:

$51.00 plus tax (Refund Policy)


Early life-history stages of the loricariid catfish Ancistruscf.triradiatus are described, from pre-hatch embryos to juveniles. The descriptions, as well as metric characters, indicate that the free-swimming embryonic stage is followed directly by the juvenile stage, without a true larval stage or metamorphosis. Intense, but gradual ontogenetic head-shape changes are present during the embryonic and free-living embryonic stages: the suckermouth gradually shifts from an almost rostral to a ventral position. The external and internal transformations related to this shape change are considered an adaptation to both the loricariid algae-scraping feeding mode and the need of suckermouth functioning from the moment of hatching, when a ventrally situated suckermouth would be disadvantageous, as a large yolk sac is present.

Keywords: development; early life history; embryo; feeding; metamorphosis; ontogeny

Document Type: Regular Paper


Affiliations: Evolutionary Morphology of Vertebrates, Ghent University – UGent, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium

Publication date: March 1, 2008


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more