The morphological features of the skull are summarized as follows: the supra-orbital process of the frontal is elongated laterally and its posterior margin is straight; the orbit is relatively short considering the skull size; the squamosal is slender and protrudes anterolaterally at an obtuse angle; the squamosal sulcus is not developed at the base of the zygomatic process; the dorsal shape of the supra-occipital is equilaterally triangular; the basioccipital and the basisphenoid are fused, forming a wide plane on the ventral surface; the alisphenoid is not exposed in the temporal region.
The internal anatomy of the speci-mens was visualized by CT scanning specimens using both medical-grade and high-resolution X-ray …
Escape will close this window.Take full advantage of our site features by enabling JavaScript.Etsy keeps your payment information secure. The gestational age when this transition occurs as described in the literature was assessed using the growth curve we compiled to allow for a ready comparison among species and authors. We thank the curators at the institutions that loaned us the specimens, in particular Jim Dines LACM, Brian O'Toole AMNH, Chris J. Conroy MVZ, and Morten Tange Olsen ZMUC. The specimen was scanned at the Laboratory of Biological Anthropology of the University of Copenhagen, Denmark using a Siemens Somatom Definition medical‐grade CT scanner (Table.The specimen images were all converted to 8bit JPEG and cropped in ImageJ (Schneider et al..We performed landmark‐based 3D GM analyses on the anatomy of the skull. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.Translations are not retained in our system. In the dolphin, all of these elements are present at Fetal stage 20 (Moran et al..Starting with specimen Hf2, we identified the interparietal in all of our specimens. Please try again.I work in Marine Mammal ecology and this sticker is just so darn cool. They are smaller than in the upper jaw, and show a size gradient, with the smaller germs found at the anterior tips of the mandible. The alveolar groove appears shallower in the lower jaw as well.Balaenopterids are strikingly diverse in size as adults, a condition also reflected in newborns, which range from 2.5 m in length for the minke whale to 8 m for the blue whale (Laws.The humpback whale specimens described here are labeled on the graph (Fig.By comparing the growth curves among species, it appears that the rorquals have faster fetal growth than odontocetes, with a marked increase in growth rate in the last one third of gestation.
This specimen is the first record of the humpback whale in the Pleistocene western North Pacific, and it is clear that M. novaeangliae can be … Fax: (619) 594‐5676 E‐mail:San Diego Natural History Museum, San Diego, California.Use the link below to share a full-text version of this article with your friends and colleagues.Extant baleen whales (Mysticeti) share a distinct suite of extreme and unique adaptations to perform bulk filter feeding, such as a long, arched skull, and mandible and the complete loss of adult dentition in favor of baleen plates. The nasal bones are colored gray to highlight changes in their position, shape and size relative to the skull. Finally, we are grateful to referees of the Palaeontological Society of Japan for their valuable comments.This will count as one of your downloads.You will have access to both the presentation and article (if available).This content is available for download via your institution's subscription.
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