By Rui Diogo
The main objective of this paintings is, to aid make clear the interrelationships of catfishes, with significant implications at the examine of the final evolution of those fishes. a superb a part of this paintings, as a result, offers with a cladistic research of catfish higher-level phylogeny in line with huge morphological info, during which are integrated a few terminal taxa now not integrated in prior analyses, yet largely a great number of characters regularly excluded from these analyses, with specific recognition being given to catfish morphology. This research provides specific significance to advanced, built-in constructions. it is going to be curiosity to scholars, ichthyologists and biologists operating in evolution, taxonomy and phylogeny.
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Extra info for Morphological Evolution, Adaptations, Homoplasies, Constraints, and Evolutionary Trends: Catfishes as a Case Study on General Phylogeny & Macroevolution
The inclusion of myological characters in the phylogenetic analysis is justified by, among others, three main reasons. Firstly, inclusion of an important amount of myological characters on the phylogenetic analysis has the major purpose of including a set of characters that have traditionally been neglected in previous analyses (see Ch. 1). This allows an increase in total number of characters included in the analysis. What is more important, it promotes the use of previously unexplored data to create hypotheses regarding the general phylogeny of catfishes, which could then be compared with other hypotheses previously elaborated by other authors.
As noted above, one of the major differences between the present phylogenetic analysis and the two other cladistic analyses done so far on catfish general phylogeny (Mo, 1991 and De Pinna, 1993) is the importance given in the present work to catfish myology. Both Mo and De Pinna, as well as the vast majority of authors dealing with catfish phylogeny, included almost exclusively data based on osteology and/or external anatomy, with only a few characters being eventually related with myological features.
These three characters are: 1) 'mesial juncture between scapulo-coracoids without interdigitations'; 2) 'first dorsal fin pterygophore inserted posterior to neural spine of ninth free vertebra'; 3) 'absence of dorsal fin spine and locking mechanism' (De Pinna, 1992: Fig. 23). Arratia. 1992 (Fig. It also provides an analysis, Fig. 8 Hypothetical relationships among certain catfish taxa according to Arratia's 1992 paper. 24 Rui Diogo based on the suspensorial features examined, as well as some other characters described previously in other studies (Fink and Fink, 1981; Arratia, 1987; Grande, 1987), of the phylogenetic relationships among the different ostariophysan orders, and also among certain catfish groups.