FIGURE 1 in Ponticola hircaniaensis sp. nov., a new and critically endangered gobiid species (Teleostei: Gobiidae) from the southern Caspian Sea basin

FIGURE 1. Left sagittal otolith (inner face) of Ponticola hircaniaensis sp. nov. (ZM-CBSU K28, 66.65 mm SL, Kaboudval Stream), showing the terminology of characters and otolith shape outline (red line). OL, maximal otolith length; OL2, minimal otolith length measured at maximum ingression of concavity of posterior rim; OH, maximal otolith height; OA, otolith area; OP, otolith perimeter; SU, sulcus; ca, cauda; os, ostium; ol, ostila lobe; CL, colliculum length measured along its axis; si, subcaudal igum; α, inclination angle of ostium measured from tip of ostium through midpoint of sulcus height at collum; β, inclination angle of anterior rim; γ, inclination angle of posterior rim; δ, inclination of line connecting preventral angle with tip of posterodorsal projection.