** Evotec's EVTG.DE shares drop around 16% in volume spike after biotech company Halozyme HALO.O said it withdrew its offer to acquire the German drug development company
** If losses hold Evotec's shares will see their worst day since July; about 1.5 million shares changed hands so far today, around 63% of their 30-day moving average full-day volume
** The stock falls to the bottom of Germany's small-cap index .SDAXI
(Reporting by Tristan Veyet)
((Tristan.chabba@thomsonreuters.com))