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We go into more details of the otolith "Sagitta" and morphology.
The otoliths "Sagitta" are described morphologically in some publications, their names being applicable to all species, applying in this case the members of our species [I] Pterophyllum scalare [/ I].
The otolith used to define the morphology of the otolith "Sagitta" the [I] Pterophyllum scalare [/ I], corresponding to a sample of 5 cm standard length.
Externally to the contour of the otolith assigned identifications to allow reference to the same comparisons, studies, etc.. On the left we can identify as the first element to the "Face" and "Antirostro" between the two will form a hollow recess is called, these prominences and depressions, otoliths vary from others, but we have observed that these patterns are always training.
At the top, then the "Antirostro", is called "Dorsal Edge" and the bottom below the "Face", "Edge Belly". In the previous photos of otoliths "Sagitta" although we can see the "Face" and "Antirostro" keep some parallels, in the case of the regions "Edge Dorsal" and "Ventral edge" can appear rather significant differences. Such differences highlight the presence in many of these otoliths, the jagged shape of the area "Edge Belly".
The next element we see in these otoliths is a depression in the limestone formation, running it from the "cutout" until almost the opposite region of the otolith. In this depression is known as "Groove" (Sulcus Acusticus), well that this groove is in contact with the "stain", constituted by nerve endings is connected to the auditory nerve.
In the groove can also identify some parts, starting from area "Face" and "Recess" we find the region called "ostium" in our Pterophyllum is wide, narrowing as it starts the channel calling this area "Collum" , moving the channel forms the area known as "peaks", where small form salient, the "Furrow" will end up in an area called "Cauda", this area increases significantly in size, presenting a depression over the face of the otolith and acquiring an oval.
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