All tantulocaridans are external parasites of crustacean hosts:

  • they attach to their hosts and make a hole in its surface using a stylet that is pushed out through a pore in the centre of an oral disc
  • the stylet is then withdrawn and the parasite begins to feed by extracting nutrition from its host via the pore

Microdajus pectinatus has been found attached to bottom-living tanaid crustaceans belonging to a single species of the genus Typhlotanais collected at a depth of 2,175 to 2,500 metres in the north-eastern Atlantic (56N 10W). This is the only known site where Microdajus pectinatus is found.

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