Sunday, October 04, 2009
Women always say men have sex (or a specific organ) "on the brain." The newly described Eastern Pacific black ghostshark (Hydrolagus melanophasma) does, to a degree. While the genitals (claspers) are in the usual position underneath the shark, an organ that looks like a spiked club on the forehead appears to stimulate and help hold on to the female of the species. I suppose there's nothing to add (beyond pondering the taste of female ghostsharks) but that we have one more example of the infinite possibilities that pop up over the huge timescales of evolution.