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Western tubenose goby
The western tubenose goby (''Proterorhinus semilunaris'') is a species of goby native to fresh waters of the Black Sea and Aegean Sea basins. This species was considered as a junior synonym of ''(P. marmoratus'') but it was confirmed as a full species based on molecular analysis.
==Description==
The body and head is flattened laterally. It has 37–46 large, cycloid scales. Its jaws are equal by length. It has an abdominal sucker without explicit blades. It has no swim bladder. The head's width is usually less than its height. Crown, nape, upper edges of operculums, origins of pectoral fins, belly, and posterior part of throat are covered with cycloid scales. Body color is brown to yellowish-gray with 4–5 dark streaks on back, transforming to spots below the middle of the body. Its fins are typically striped. It reaches . It differs from the closely related marine tubenose goby ''P. marmoratus'' by the head length, which constitutes 28–32% of the fish's standard length. The posterior membrane of first dorsal fin reaches the origin of the second dorsal fin. Arterior naris reaches the upper lip or uppermost margin of the lower lip. Eye diameter is 16–21% of head length.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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