Ponton Dominique auteur aut IRD text journalArticle eng text/pdf born digital access The 2D shape of sagittae of Encrasicholina devisi, E. heteroloba, E. cf. punctifer, and Stolephorus indicus, four tropical Engraulididae of New Caledonia, was studied with 1) dimensionless shape descriptors (form factor, roundness, and aspect ratio); 2) elliptic Fourier analysis (EFA) and Fast Fourier Transform (FFT) of 2D outline; and 3) geometric morphometrics (GM) based on four standard landmarks and nine semi-landmarks. The largest sagittae of E. cf. punctifer were lacier, i.e., had a smaller form factor, than the sagittae of the other species. The sagittae of E. devisi and S. indicus were more roundish, and presented a lower aspect ratio, than those of E. heteroloba and E. cf. punctifer. Between-class correspondence analysis (COA) indicated that between-species inertia was the lowest when based on the 96 Fourier coefficients originating from EFA, and the highest when based on the 22 partial warps originating from GM. As otoliths of different sizes from different species presented similar shapes, relative between-species inertia increased markedly when length, width, perimeter, and area were added to the set of variables originating from EFA, FFT, or GM. Despite otoliths having only a few, sparsely located, homologous landmarks, GM appeared slightly more efficient in distinguishing the sagittae of the four species and allowed visualization of the modification of otolith shape as they grow. specialized Engraulididae sagittae size form factors Fourier analysis thin plate spline 034 267 6 750-757 2006 0362-2525 https://www.documentation.ird.fr/hor/fdi:010051432 10.1002/jmor.10439 0362-2525 [F B010051432] https://www.documentation.ird.fr/hor/fdi:010051432 https://www.documentation.ird.fr/intranet/publi/depot/2011-03-03/010051432.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2006-08-10 2017-08-23 fdi:010051432 fre