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Tuleariocaris holthuisi  and  Arete indicus  are two ectocommensal shrimps closely associated with the tropical sea urchin  Echinometra mathaei . This study provides a comparison of these two  E .  mathaei  symbiotic crustaceans and particularly focuses on the relationship between  T .  holthuisi  and its host’s pigments (i.e. spinochromes), and its dependency on its host. While all the analyses underline a close association between  A .  indicus  and  E .  mathaei , they reveal a particularly close interaction between  T .  holthuisi  and its host. Chemical analyses reveal that these shrimps present the same spinochrome composition as  E .  mathaei , and have similar colouration, allowing camouflage. Isotopic composition and pigment loss after host separation suggest that these pigments are certainly assimilated upon feeding on the urchin. Moreover, symbiont isolation experiments demonstrate the high dependency of  T .  holthuisi  on its host and the importance of the host’s pigments on their survival capacity. Finally, some host recognition mechanisms are investigated for  T .  holthuisi  and show the probable implication of spinochromes in host selection, through chemical recognition. Hence, all the results suggest the essential roles of spinochromes for  T .  holthuisi , which, in turn, suggests the potential implication of these pigments in the shrimps’ metabolism.

Echinometra mathaei and its ectocommensal shrimps: the role of sea urchin spinochrome pigments in the symbiotic association