scholarly journals Morphological features of the nasal cavities of hawksbill, olive ridley, and black sea turtles: Comparative studies with green, loggerhead and leatherback sea turtles

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0250873
Author(s):  
Chiyo Kitayama ◽  
Keiichi Ueda ◽  
Mariko Omata ◽  
Taketeru Tomita ◽  
Shingo Fukada ◽  
...  
Keyword(s):  
Nasal Cavity ◽  
Black Sea ◽  
Heat Dissipation ◽  
Sea Turtles ◽  
Water Pressure ◽  
Structural Features ◽  
Olive Ridley ◽  
Nasal Cavities ◽  
Computed Tomography Images ◽  
Leatherback Sea Turtles

We analyzed the internal structure of the nasal cavities of hawksbill, olive ridley and black sea turtles from computed tomography images. The nasal cavities of all three species consisted of a vestibule, nasopharyngeal duct and cavum nasi proprium that included anterodorsal, posterodorsal and anteroventral diverticula, and a small posteroventral salience formed by a fossa of the wall. These findings were similar to those of green and loggerhead sea turtles (Cheloniidae), but differed from those of leatherback sea turtles (Dermochelyidae). Compared to the Cheloniidae species, the nasal cavity in leatherback sea turtles was relatively shorter, wider and larger in volume. Those structural features of the nasal cavity of leatherback sea turtles might help to suppress heat dissipation and reduce water pressure within the nasal cavity in cold and deep waters.

The nasal cavity in sea turtles: adaptation to olfaction and seawater flow

2021 ◽  
Author(s):  
Daisuke Kondoh ◽  
Chiyo Kitayama ◽  
Yusuke K. Kawai
Keyword(s):  
Nasal Cavity ◽  
Sea Turtles

scholarly journals Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica

Phytotaxa ◽  
2015 ◽  
Vol 233 (3) ◽  
pp. 236 ◽  
Author(s):  
Roksana Majewska ◽  
J. P. Kociolek ◽  
Evan W. Thomas ◽  
Mario De Stefano ◽  
Mario Santoro ◽  
...  
Keyword(s):  
Costa Rica ◽  
Marine Mammals ◽  
Sea Turtles ◽  
Sea Turtle ◽  
New Genera ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
Marine Turtles ◽  
The Family ◽  
Long Time

Marine mammals such as whales and dolphins have been known for a long time to host a very specific epizoic community on their skin. Less known however is the presence of a similar community on the carapaces of sea turtles. The present study is the first describing new taxa inhabiting sea turtle carapaces. Samples, collected from nesting olive ridley sea turtles (Lepidochelys olivacea) on Ostional Beach (Costa Rica), were studied using light and scanning electron microscopy. Two unknown small-celled gomphonemoid taxa were analysed in more detail and are described as two new genera, closely related to other gomphonemoid genera with septate girdle bands, such as Tripterion, Cuneolus and Gomphoseptatum. Chelonicola Majewska, De Stefano & Van de Vijver gen. nov. has a flat valve face, uniseriate striae composed of more than three areolae, simple external raphe endings, internally a siliceous flap over the proximal raphe endings and lives on mucilaginous stalks. Poulinea Majewska, De Stefano & Van de Vijver gen. nov. has at least one concave valve, uniseriate striae composed of only two elongated areolae, external distal raphe endings covered by thickened siliceous flaps and lives attached to the substrate by a mucilaginous pad. Chelonicola costaricensis Majewska, De Stefano & Van de Vijver sp. nov. and Poulinea lepidochelicola Majewska, De Stefano & Van de Vijver sp. nov. can be separated based on stria structure, girdle structure composed of more than 10 copulae, raphe structure and general valve outline. A cladistics analysis of putative members of the Rhoicospheniaceae indicates that the family is polyphyletic. Chelonicola and Poulinea are sister taxa, and form a monophyletic group with Cuneolus and Tripterion, but are not closely related to Rhoicosphenia, or other genera previously assigned to this family. Features used to help diagnose the family such as symmetry and presence of septa and pseudosepta are homoplastic across the raphid diatom tree of life.

Status of Olive Ridley Sea Turtles (Lepidochelys olivacea) After 29 Years of Nesting Rookery Conservation in Nayarit and Bahía de Banderas, Mexico

2018 ◽  
Vol 17 (1) ◽  
pp. 27-36
Author(s):  
Catherine E. Hart ◽  
Adrián Maldonado-Gasca ◽  
César P. Ley-Quiñonez ◽  
Miguel Flores-Peregrina ◽  
Jose de Jesús Romero-Villarruel ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
Olive Ridley Sea Turtles

Palatal flap in bilateral inferior partial maxillectomy

2021 ◽  
Vol 14 (3) ◽  
pp. e239006
Author(s):  
Daniel Sathiya Sundaram Selvaraj ◽  
Pranay Gaikwad ◽  
Jagadish Ebenezer
Keyword(s):  
Oral Cavity ◽  
Nasal Cavity ◽  
Local Flap ◽  
Form And Function ◽  
Nasal Cavities ◽  
And Function ◽  
Palatine Artery

Maxillectomy is done for a variety of disease conditions. Reconstruction following maxillectomy is done to restore the form and function. One of the important goals that are to be achieved in reconstruction is the separation of the oral and nasal cavities. In this article, we report the use of palatal flap by preserving the descending palatine artery during bilateral inferior partial maxillectomy, for separating the nasal cavity from the oral cavity. This technique eliminates the need for an obturator or another free or local flap for this purpose.

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