The Eastern Pacific black ghostshark (Hydrolagus melanophasma), a new species from California and Baja California, not taunting other marine life with its retractable forehead genitalia. Credit: MBARI ...
Watson, D. M. S., Proc. Zool. Soc. Lond., for 1934, 437 (1934). Watson, D. M. S., Trans. Roy. Soc. Edin., 59, 387 (1938).
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