Title: Cetaceos evolucion, Author: Museo Nacional de Historia Natural, Name: Cetaceos evolucion, Length: 2 pages, Page: 1, Published. La teoría tradicional de la evolución de los cetáceos postulaba que derivaben de los mesoníquidos, un grupu d'ungulaos carnívores paecencies a llobos. Mónica Buono · @PatagonianWhale. Assistant Researcher CONICET. Research interests: anatomy, systematic and paleobiology of fossil cetaceans from.


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The specimen is placed within Eomysticetidae because it shows: The specimen Figure 3 includes of a partial skull, lacking the condyles and rostrum apex, with a preserved total length of mm. The vertebrae are unprepared. evolucion cetaceos

Cetáceos - Wikipedia, a enciclopedia libre

The age class is subadult as indicated by cranial sutures which are well closed, but distinct, and not completely fused.

This suture forms the evolucion cetaceos margin of the ascending process of the maxilla with an uncertain evolucion cetaceos from the premaxilla.

The specimen is placed in Eomysticetidae because the cranial morphology is phenetically similar to other eomysticetids in features including: Continuous lines show anatomical details, dashed lines mark missing anatomy, and diagonal lines mark broken areas.

Suborder Mysticeti-Chaeomysticeti Family indet. San Juan de la Costa, Evolucion cetaceos Saladito, mine spoils The specimens Figure 4 consist evolucion cetaceos two partial skulls which differ from each other in dorsal cranial morphology, but share a similar periotic bone.

The condylobasal length is lost for both, but other size estimates are possible.

Cetacea - Wikiwand

Both specimens are subadults as indicated by cranial sutures that are not completely fused. Notable primitive characters of the periotic include: The fossils are too incomplete to assess possible synapomorphies for Chaeomysticeti, such as absence of teeth Mitchell, or an orbital crest well positioned anteriorly on the dorsal surface of the frontal Geisler and Sanders, But, other features indicate that the fossils are a species of chaeomysticetes: The inferred age class is adult, as indicated by completely closed cranial sutures, a developed nuchal crest, and epiphyses fused to the evolucion cetaceos vertebra body on significance of fusion, see Perrin, Amongst features of note, the specimen is small compared with both S.

The skull has evolucion cetaceos shortened rostrum with a narrow snout and short mesorostral groove, and a supraoccipital evolucion cetaceos with a semicircular outline behind the anterior margin of the squamosal fossa.

  • Cetacea - Wikipedia

The intertemporal region is prominent. The small teeth are heterodont but not polydont.

Origen y evolución de los cetáceo

The maxilla rises posteriorly over the frontal, extended near to the frontoparietal suture; laterally overlaps part of the evolucion cetaceos process, but does not reach the supraorbital margin, leaving the rest of the frontal exposed dorsally above the elevated roof of the evolucion cetaceos.

The premaxillary sac fossa and associated foramina and sulci lie well forward on the rostrum, anterior to the antorbital notch.


Many of the latter are plesiomorphic features shared with S. Systematic questions should be resolved by a evolucion cetaceos morphological description and phylogenetic evolucion cetaceos.

San Juan de la Costa, Arroyo Tarabillas, mine spoils The inferred age class is adult, as indicated by cranial sutures which are relatively closed and tight.


The skull is more dorsoventrally flat than S. Evolucion cetaceos rostrum is less concave and, the premaxillary sac fossae are more anterior and shallow than S.

Continuous lines show evolucion cetaceos details and diagonal lines mark broken areas.

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