Patterns of morphogenesis mediated by dynamic microvilli: Chaetogenesis in Nereis vexillosa

@article{OClair2004PatternsOM,
  title={Patterns of morphogenesis mediated by dynamic microvilli: Chaetogenesis in Nereis vexillosa},
  author={Rita M. O'Clair and Richard A. Cloney},
  journal={Cell and Tissue Research},
  year={2004},
  volume={151},
  pages={141-157}
}
SummaryThe pattern of morphogenesis of the chitinous compound (jointed) setae of the larvae of polychaete Nereis vexillosa Grube was deduced from electron-microscopic analyses of many stages of secretion. Each seta is secreted over a period of three days within an epidermal follicle consisting of several lateral cells and a basal cell (chaetoblast). The configuration of the apical surface of the chaetoblast changes continuously during secretion. Secreted setal material is polymerized into… 
Chaetae and chaetogenesis in polychaetes (Annelida)
TLDR
Different types of chaetae are compared here and the present state of knowledge of their structure and formation is used to present some homology hypotheses, including some strong arguments for a homology of uncini and certain hooks and hooded hooks.
Cephalopod integument: The ultrastructure of Kölliker's organs and their relationship to setae
TLDR
It is inferred that the tuft elongates by basal appositional growth and that glycoprotein secreted by the follicle cells is organized into filaments by the apical plasmalemma of the chaetoblast.
Ultrastructure and development of forked and capillary setae in the polychaetes Orbinia bioreti and Orbinia latreillii (Annelida: Orbiniidae)
TLDR
The analysis of the crenulate capillaries in Orbinia latreillii reveals a formation process which clearly differs from the development of Equisetum-like setae of lingulid bra-chiopods.
Formation and degeneration of scaled capillary notochaetae in Owenia fusiformis Delle Chiaje, 1844 (Oweniidae, Annelida)
TLDR
The scaled capillary notochaetae of Owenia fusiformis are investigated, looking both into the formation process that causes the scaly surface orna-mentation and into their arrangement within tight bundles, demonstrating the incredible plasticity of chaetogenesis that allows forming a vast array of three-dimensional structures.
Structure and formation of the uncini in Pectinaria koreni, Pectinaria auricoma (Terebellida) and Spirorbis spirorbis (Sabellida): inplications for annelid phylogeny and the position of the Pogonophora
TLDR
It can be concluded that Arenicolida, Maldanida and Psammodrilida are closely related to the monophylum consisting of Terebellida, Sabellida and Pogonophora, and that these six taxa share a common ancestor, which evolved transverse rows of setae with apically curved spines and a formative site lateral to the edge of the neuropodial rim.
Chaetal arrangement and chaetogenesis of hooded hooks in Lumbrineris (Scoletoma) fragilis and Lumbrineris tetraura (Eunicida, Annelida)
TLDR
Investigations into the ultrastructure and formation of hooded hooks in different capitellids and spionids revealed that these chaetae can be homologized, and confirms the predicted differences in chaetogenesis of the superficially similar hooded Hooks of capiteLLids and Spionids compared with those of eunicids.
Morphology and behaviour of the benthic larva of Arenicola cristata (Polychaeta)
The structure of the three-setiger larva of Arenicola cristata is described with emphasis on the ultrastructure of the apical region, particularly the nervous and muscular systems, and ciliated and
External aspects of the setae of Sabella penicillus L. (Polychaeta)
TLDR
A general model is proposed that combines the different external regions of the setal types and shows how these uncini types are very similar morphologically, even though their ultimate forms are markedly different.
Formation and structure of paleae and chaetal arrangement in chrysopetalidae (Annelida)
TLDR
Details on the topology of the chaetal formative site, where chaetogenesis occurs continuously, are revealed and differences in the number of formative sites in neuro- and notopodia that now need to be studied in a larger number phyllodocid taxa are indicated.
Prototroch structure and innervation in the trochophore larva of Phyllodoce (Polychaeta)
The prototroch and prototroch nerve in trochophores of two Phyllodoce species are described at the ultrastructural level and interpreted with reference to the observed normal behavior of larvae
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