Evolution of the cephalopod head complex by assembly of multiple molluscan body parts: Evidence from Nautilus embryonic development

@article{Shigeno2008EvolutionOT,
  title={Evolution of the cephalopod head complex by assembly of multiple molluscan body parts: Evidence from Nautilus embryonic development},
  author={Shuichi Shigeno and Takenori Sasaki and Takeya Moritaki and Takashi Kasugai and Michael Vecchione and Kiyokazu Agata},
  journal={Journal of Morphology},
  year={2008},
  volume={269}
}
Cephalopod head parts are among the most complex occurring in all invertebrates. [...] Key Method Using a specialized aquarium system, we successfully obtained a series of developmental stages that enabled us to test previous controversial scenarios. Our results demonstrate that the embryonic organs exhibit body plans that are primarily bilateral and antero-posteriorly elongated at stereotyped positions. The distinct cephalic compartment, foot, brain cords, mantle, and shell resemble the body plans of…Expand
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The origins of cephalopod body plans: A geometrical and developmental basis for the evolution of vertebrate-like organ systems
TLDR
The cephalopod body plans are characterized, set against those of the other bilaterians, in the light of recent data from paleontology, embryology, and molecular gene expression patterns to provide a review and new interpretation with an emphasis on the topographic transition of the soft parts that is shaped by a shared concentric circle or ovoid pattern in the embryos and adults of extant or fossil molluscs. Expand
Nervous system development in cephalopods: How egg yolk-richness modifies the topology of the mediolateral patterning system.
TLDR
These findings confirm - by means of molecular tools - the location of both ventral and dorsal poles in cephalopod embryos. Expand
Cephalopod origin and evolution: A congruent picture emerging from fossils, development and molecules
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A growing body of evidence from the fossil record, embryology and Bayesian molecular divergence estimations provides a comprehensive picture of cephalopods' origins and evolution. Expand
The cephalopod arm crown: appendage formation and differentiation in the Hawaiian bobtail squid Euprymna scolopes
TLDR
The early outgrowth and differentiation of the E. scolopes arm crown shows similarities to the related, yet derived cephalopod Octopus vulgaris, raising the question of whether these similarities reflect a recruitment of similar molecular patterning pathways. Expand
Evolution of limb development in cephalopod mollusks
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It is shown that all three axes of cuttlefish limbs are patterned by the same signaling networks that act in vertebrates and arthropods, although they evolved limbs independently. Expand
A novel role for dpp in the shaping of bivalve shells revealed in a conserved molluscan developmental program.
TLDR
The cell cleavage and expression patterns of three genes, brachyury, engrailed, and dpp, in the Japanese spiny oyster Saccostrea kegaki are described and the function of dpp in this species is examined to elucidate the molecular developmental basis underlying this prominent morphological transition. Expand
Evolution of limb development in cephalopod mollusks
TLDR
It is shown that all three axes of cuttlefish limbs are patterned by the same signaling networks that act in vertebrates and arthropods, although they evolved limbs independently. Expand
The scaphopod foot is ventral: more evidence from the anatomy of Rhabdus rectius (Carpenter, 1864) (Dentaliida: Rhabdidae)
TLDR
Based on the orientation of the digestive tract and the dorso-ventral muscles, it is found further evidence to support the interpretation that the concave side of the scaphopod shell is anterior (the site of the mouth) and the foot is ventral. Expand
Cephalopod Brains: An Overview of Current Knowledge to Facilitate Comparison With Vertebrates
TLDR
A critical analysis of cephalopod neural systems showing similarities to the cerebral cortex, thalamus, basal ganglia, midbrain, cerebellum, hypothalamus, brain stem, and spinal cord of vertebrates is described. Expand
POU genes are expressed during the formation of individual ganglia of the cephalopod central nervous system
TLDR
The expression of four POU genes in unique spatiotemporal combinations during early neurogenesis and sensory organ development of the pygmy squid Idiosepius notoides suggests that they fulfill distinct tasks during early brain development. Expand
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