Fig 1.
Drawing schema of internal nasal structure of sea turtles and extraction for volume measurement in this study.
(A and B) Green and loggerhead (A) and leatherback (B) sea turtles. Left lateral view. All species have anterodorsal (1) and posterodorsal (4) diverticula, and nasopharyngeal duct (ND). Leatherback sea turtles lack anteroventral (2) diverticulum and posteroventral fossa (3), but two additional fossae (*) are anteriorly to anterodorsal diverticula (1). (A’ and B’) Extraction of intermediate and olfactory regions from nasal cavity of Cheloniidae species (A’) and dermochelyid leatherback sea turtle (B’). Red dashed lines, section cuts. (A” and B”) Intermediate region. (A”‘ and B”‘) Olfactory region.
Table 1.
Features of analyzed sea turtles.
Fig 2.
Three-dimensional reconstructions based on computed tomography images of nasal cavity of hawksbill sea turtle.
(A) Left lateral view of internal nasal cavity (yellow) at anterior region of skull. Dorsal (B) and ventral (C) views of nasal cavity. Anterodorsal (1), posterodorsal (4) and anteroventral (2) diverticula, and small posteroventral salience formed by fossa on wall (3) in cavum nasi proprium anterior to nasopharyngeal duct (ND). See also S1 Video.
Fig 3.
Three-dimensional reconstructions based on computed tomography images of nasal cavity of olive ridley sea turtle.
(A) Left lateral view of nasal cavity structure (yellow) at anterior region of skull. Dorsal (B) and ventral (C) views of nasal cavity. Anterodorsal (1), posterodorsal (4) and anteroventral (2) diverticula, and small posteroventral salience formed by fossa on wall (3) in cavum nasi proprium anterior to nasopharyngeal duct (ND). See also S2 Video.
Fig 4.
Three-dimensional reconstructions based on computed tomography images of nasal cavity of black sea turtle.
(A) Left lateral view of nasal cavity structure (yellow) at anterior region of skull. Dorsal (B) and ventral (C) views of nasal cavity. Anterodorsal (1), posterodorsal (4) and anteroventral (2) diverticula, and small posteroventral salience formed by fossa on wall (3) in cavum nasi proprium anterior to nasopharyngeal duct (ND).
Table 2.
Measurements of left half of nasal structure.
Table 3.
Indicators of the nasal morphology analyzed in this study.