, Volume 110, Issue 6, pp 313–316

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

  • Ronald B. Toll
  • Lynetta C. Binger

DOI: 10.1007/BF01668021

Cite this article as:
Toll, R.B. & Binger, L.C. Zoomorphology (1991) 110: 313. doi:10.1007/BF01668021


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.

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Ronald B. Toll
    • 1
  • Lynetta C. Binger
    • 2
  1. 1.Department of BiologyThe University of the SouthSewaneeUSA
  2. 2.Department of EntomologyUniversity of Illinois at Urbana-ChampaignUrbanaUSA