, Volume 110, Issue 6, pp 313-316

First online:

Arm anomalies: cases of supernumerary development and bilateral agenesis of arm pairs in Octopoda (Mollusca, Cephalopoda)

  • Ronald B. TollAffiliated withDepartment of Biology, The University of the South
  • , Lynetta C. BingerAffiliated withDepartment of Entomology, University of Illinois at Urbana-Champaign

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The first case of true hexapody among the Octopoda, resulting from bilateral agenesis of one arm pair, is described for a malePteroctopus tetracirrhus. A case of decapody, with uniform development of all arms, is also reported for the first time for a maleOctopus briareus. Both conditions apparently result from developmental anomalies of the embryonic arm anlagen. A survey of other anomalous conditions relating to arm development and regeneration within the Cephalopoda is provided. A possible relationship of polyfurcation of arm tips in the Octopoda with regenerative processes in amphibian limbs leading to similar conditions is suggested.