Which morphological trait clearly differentiates *Rhinogobius sudoccidentalis* from *Rhinogobius lithopolychroma*?
Answer
Longitudinal scale series count
*Rhinogobius sudoccidentalis* has a longitudinal scale series count of 22–24 (mode 23), while *Rhinogobius lithopolychroma* has a significantly higher count of 30–33 (mode 31).
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