What's the difference between acanthopterygian and acanthopterygii?
Acanthopterygian
Definition:
(a.) Belonging to the order of fishes having spinose fins, as the perch.
(n.) A spiny-finned fish.
Example Sentences:
(1) The hypothesis that the posterior pretectal nucleus in these species is homologous to both the pars intermedius of the superficial pretectal nucleus and nucleus glomerulosus in acanthopterygians is supported by multiple similarities in relative position and cytoarchitecture.
(2) The presence of glomeruli in the posterior pretectal nucleus and nucleus glomerulosus in esocids and acanthopterygians, respectively, and the presence of two nuclei, the pars intermedius and nucleus glomerulosus, in acanthopterygians, as opposed to one nucleus, the posterior pretectal nucleus, are apomorphies.
(3) Nevertheless, the position of Brotula multibarbata showed that this fish is an evolved acanthopterygian.
Acanthopterygii
Definition:
(n. pl.) An order of fishes having some of the rays of the dorsal, ventral, and anal fins unarticulated and spinelike, as the perch.
Example Sentences:
(1) The electrokinetic and thermostability properties of phosphoglucose isomerase (PGI) in three species of temperate fishes (Perciformes, Acanthopterygii)--Cynoscion striatus, Macrodon ancylodon and Micropogonias furnieri--have been analyzed in order to study the adaptative 2.