Comparative studies and evolution of muscles in chaetognaths

@article{Casanova2002ComparativeSA,
  title={Comparative studies and evolution of muscles in chaetognaths},
  author={J. Casanova and M. Duvert},
  journal={Marine Biology},
  year={2002},
  volume={141},
  pages={925-938}
}
The chaetognath locomotory muscles exhibit astonishing variations. The secondary muscle, which represents less than 1% of the body wall, has two forms. One is unique in the animal kingdom (alternation of two sarcomere types: “classical cross-striated” s1 and a unique type, s2) and has already been described; it characterizes most of the genera. The other, found only in more or less benthic species, functions by supercontraction. In the primitive genus Archeterokrohnia, it often exhibits “s1/s2… Expand
Cambrian chaetognaths recognized in Burgess Shale fossils
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