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We present two cases of study of ontogenetic allometry in outlines of bivalves using longitudinal data, a rarity among fossils, based on the preserved post-larval record of shells. The examples are two infaunal burrowing bivalves of the southern South America,  Claibornicardia paleopatagonica  (Archiheterodonta: Carditidae) (early Paleocene) and  Crassatella kokeni  (Archiheterodonta: Crassatellidae) (late Oligocene–late Miocene). Outline analyses were conducted using a geometric morphometric approach (Elliptic Fourier Analysis), obtaining successive outlines from shells’ growth lines, which were used to reconstruct ontogenetic trajectories. In both taxa, ontogenetic changes are characterized by the presence of positive allometry in the extension of posterior end, resulting in elongated adult shells. This particular allometric growth is known in others infaunal burrowing bivalves ( Claibornicardia alticostata  and some  Spissatella  species) and the resulting adult morphology is present in representatives of several groups (e.g., Carditidae, Crassatellidae, Veneridae, Trigoniidae). Taxonomic, ecological and evolutionary implications of this allometric growth pattern are discussed.

peerj

Allometric shell growth in infaunal burrowing bivalves: examples of the archiheterodonts<i>Claibornicardia paleopatagonica</i>(Ihering, 1903) and<i>Crassatella kokeni</i>Ihering, 1899

Allometric shell growth in infaunal burrowing bivalves: examples of the archiheterodontsClaibornicardia paleopatagonica(Ihering, 1903) andCrassatella kokeniIhering, 1899