
Using a shell as a wing: pairing of dissimilar appendages in Atlantiid heteropod swimming
Author(s) -
Ferhat Karakaş,
Daniel D’Oliveira,
Amy E. Maas,
David Murphy
Publication year - 2018
Publication title -
journal of experimental biology
Language(s) - English
Resource type - Journals
eISSN - 1477-9145
pISSN - 0022-0949
DOI - 10.1242/jeb.192062
Subject(s) - appendage , wing , pairing , shell (structure) , biology , anatomy , zoology , physics , materials science , composite material , thermodynamics , superconductivity , quantum mechanics
Atlantiid heteropods are zooplanktonic marine snails which have a calcium carbonate shell and single swimming fin. They actively swim to hunt prey and vertically migrate. Previous accounts of atlantiid heteropod swimming described these animals sculling with the swimming fin while the shell passively hung beneath the body. Here we show, via high speed stereophotogrammetric measurements of body, fin, and shell kinematics, that the atlantiid heteropod Atlanta selvagensis actively flaps both the swimming fin and shell in a highly coordinated wing-like manner in order to swim in the intermediate Reynolds number regime (Re=10-100). The fin and shell kinematics indicate that atlantiid heteropods use unsteady hydrodynamic mechanisms such as the clap and fling and delayed stall. Unique features of atlantid heteropod swimming include the coordinated pairing of dissimilar appendages, use of the clap and fling mechanism twice during each stroke cycle, and the fin's extremely large stroke amplitude which exceeds 180°.