Fig. 2

Side views of the aragonitic shells (maximum diameter specimens, only analysed specimen are figured) of S. spirula from the Atlantic Ocean, Indian Ocean and Pacific Ocean localities. a Canary Islands, NHMW 2015/0013/0001. b Tobago, NHMW 2015/0014/0001. c South Africa, NHMW 2015/0015/0001. d Brazil, 2008z0184/0008a. e Tanzania, NHMW 2015/0016/0001. f Mauritius, NHMW 2015/0017/0001. g Maldives, NHMW 2015/0018/0001. h Sri Lanka, NHMW 2015/0019/0001. i Thailand, 2007z0183/0015. j West Australia, encrusted by bryozoan colonies (Jellyella eburnea), NHMW 2015/0020/0001. k East Australia, encrusted by barnacles (Lepas pectinata), NHMW 2007z0171/0037. Scale bar for all specimens = 1 cm