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We used 3D\u2010anatomical landmarks in order to study the skull ontogeny of two closely related species,<jats:italic>Lagenorhynchus obscurus<\/jats:italic>and<jats:italic>Lagenorhynchus australis<\/jats:italic>, with a total sample of 52 skulls. We found shared trends between species, such as the relative compression of the neurocranium and the enlargement of the rostrum during ontogeny. However, these are common mammalian features, associated with prenatal brain development and sensory capsules. Moreover, we found a posterior displacement of the external nares and infraorbital foramina, and a strong development of the rostrum in an anteroposterior direction. Such trends are associated with the process of telescoping and have been observed in postnatal ontogeny of other odontocetes, suggesting a constraint in the pattern. Interspecific differences related to the deepness of facial region, robustness of the feeding apparatus and rostrum orientation may be related with the specific lifestyles of<jats:italic>L. obscurus<\/jats:italic>and<jats:italic>L. australis<\/jats:italic>. We also tested the presence of three different modules in the skull (basicranium, neurocranium, rostrum), all of which presented strong integration. Only the rostrum showed a different ontogenetic trajectory between species. Even though we detected directional asymmetry, changes in this feature along ontogeny were not detectable. Because asymmetry may be related to echolocation, our results suggest a functional importance of directional asymmetry from the beginning of postnatal life. J. Morphol. 278:203\u2013214, 2017. \u00a9 2016 Wiley Periodicals,Inc.<\/jats:p>","DOI":"10.1002\/jmor.20629","type":"journal-article","created":{"date-parts":[[2016,11,17]],"date-time":"2016-11-17T09:36:05Z","timestamp":1479375365000},"page":"203-214","source":"Crossref","is-referenced-by-count":21,"title":["Skull ontogeny and modularity in two species of<i>Lagenorhynchus<\/i>: Morphological and ecological implications"],"prefix":"10.1002","volume":"278","author":[{"given":"Daniela L.","family":"del Castillo","sequence":"first","affiliation":[{"name":"Laboratorio de Ecolog\u00eda, Comportamiento y Mam\u00edferos Marinos, Divisi\u00f3n Mastozoolog\u00eda Museo Argentino de Ciencias Naturales \u201cBernardino Rivadavia\u201d Av. \u00c1ngel Gallardo 470 (C1405DJR) Buenos Aires Argentina"},{"name":"CONICET. 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