Taranis moerchii is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

The two specimens from station 2077, in 1255 fathoms, are somewhat stouter than those previously obtained, and have the principal carina, forming the shoulder, larger and more prominent than usual, but it bears only very minute tubercles, corresponding to the very fine and close riblets which cross the wide and abruptly sloping subsutural band obliquely, and are about twice as numerous and much finer than in the ordinary variety.

On the body whorl there are about six prominent, distant, revolving cinguli below the shoulder, besides some faint ones on the base of the siphonal canal.

The lines of growth are much finer than in the ordinary form and do not take the appearance of riblets on the body whorl, nor do they render the cinguli nodulous.

This form, therefore, is characterized by the relative predominance of the spiral sculpture over the transverse, and by the absence of distinct nodules at the crossing of the two systems of lines.