On the Early Development of the Vestimentiferan Tube WormRidgeiasp. and Observations on the Nervous System and Trophosome ofRidgeiasp. andRiftia pachyptila

Jones, Meredith L.; Gardiner, Stephen L.

doi:10.2307/1541941

Cited by 63 publications

(57 citation statements)

References 10 publications

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“…The two primary tentacles enlarge and new ones develop as buds. Jones & Gardiner (1989) examined a large number of Ridgeia juveniles and have tabulated the course of addition of tentacles (branchial filaments), opisthosomal chaetae, the development of the vestimentum and appearance of the obturaculum. They show that peculiar larval chaetae persist in some individuals until the opisthosome has developed as many as 8 or 9 segments with normal toothed chaetae (Figure 6 (7-8)), many branchial filaments have formed, and the obturaculum is developing.…”

Section: Juvenile Developmentmentioning

confidence: 99%

Development of Perviata and Vestimentifera (Pogonophora)

Southward

1999

Reproductive Strategies and Developmental Patterns in Annelids

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Existing knowledge of the embryonic and larval development of perviate and vestimentiferan pogonophorans is reviewed. A form of spiral cleavage has been reported from both groups, but further clarification is desirable, The perviates studied have large yolky eggs, incubated in the maternal tube to a ciliated settlement stage. Others with smaller eggs are still unstudied, but may have pelagic larvae. Vestimentiferans have small eggs and pelagic, nonfeeding larvae, Comparisons of the development of perviates with that of vestimentiferans lead to the conclusion that the two groups belong to one higher taxon. An annelidan relationship is indicated because the ciliated settlement stages of both are like annelid trochophores in their ciliation and in the way they develop chaetae initially on two segments.

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Section: Juvenile Developmentmentioning

confidence: 99%

Development of Perviata and Vestimentifera (Pogonophora)

Southward

1999

Reproductive Strategies and Developmental Patterns in Annelids

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“…However, there is electron microscopy evidence in Vestimentifera [21]. There is also evidence for primitive myelin sheaths in a related phyla, the phoronids.…”

Section: Annelidsmentioning

confidence: 99%

The Evolution of Myelin: Theories and Application to Human Disease

Knowles¹

2017

J Evol Med

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Myelin, once thought of as a simple insulating sheath, is now known to be a complex, dynamic structure. It has multiple functions in addition to increasing conduction velocity, including reducing the energetic cost of action potentials, saving space, and metabolic functions. Myelin is also notable for likely having arisen independently at least three times over the course of evolutionary history. This article reviews the available evidence about the evolution of myelin and proposes a hypothesis of how it arose in vertebrates. It then discusses the evolutionary trade-offs associated with myelination and suggests a possible animal model for further study of this phenomenon. Finally, it briefly covers the neural regulation of myelination before discussing possible roles of myelin in human social cognition and evolution, and the relevance of this to human disease.

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“…Embryonic and larval development of a few species has been reported (Young et al, 1996;Miura et al, 1997;Marsh et al, 2001;Miyake et al, 2006). Some authors have described the morphology of post-settlement juvenile stages of tubeworms from fortuitously collected specimens (Southward, 1988;Jones and Gardiner, 1989;Nussbaumer et al, 2006). To examine the developmental mechanisms of segmentation, it is necessary to study many specimens of each developmental stage.…”

Section: Posterior Segment Regeneration From Non-segmented Regionmentioning

confidence: 99%