A comparative study of the development ofPhascolosoma agassizii,Golfingia pugettensis, andThemiste pyroideswith a discussion of developmental patterns in the Sipuncula

Rice, Mary E.

doi:10.1080/00785326.1967.10409618

Cited by 44 publications

(55 citation statements)

References 7 publications

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“…Thus far, it has been suggested that ancestral remnants of segmentation are reflected in neuronal architecture of the ventral nerve cord during larval development of sipunculans (Kristof et al, 2008(Kristof et al, , 2011Wanninger et al, 2009), which certainly warrants additional, more comprehensive studies. Third, sipunculans are valuable research organisms for reproductive biology (Rice, 1973(Rice, , 1989(Rice, , 1993Reunov and Rice, 1993;Adrianov and Maiorova, 2010), comparative development (Åkesson, 1958;Rice, 1967Rice, , 1975Rice, , 1988Schulze and Rice, 2009a) and life history character reconstruction and evolution (Jägersten, 1972;Rice, 1976Rice, , 1985. They are also emerging as important non-model organisms for evolutionary and developmental biology, or evo-devo (Schulze and Rice, 2009b;Wanninger et al, 2005Wanninger et al, , 2009Wanninger, 2008;Boyle and Seaver, 2010;Boyle and Rice, 2014).…”

Section: Introductionmentioning

confidence: 99%

Re-evaluating the phylogeny of Sipuncula through transcriptomics

Lemer

Kawauchi

Andrade

et al. 2015

Molecular Phylogenetics and Evolution

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Section: Introductionmentioning

confidence: 99%

Re-evaluating the phylogeny of Sipuncula through transcriptomics

Lemer

Kawauchi

Andrade

et al. 2015

Molecular Phylogenetics and Evolution

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“…Rice (1967) was the first to present data on the embryonic and larval development stages of P. agassizii cultured in the laboratory. These data illustrated with light micrographs make it possible to follow the main stages of development of this sipunculan.…”

Section: Introductionmentioning

confidence: 99%

“…pellucidum) (Rice 1976(Rice , 1981, P. agassizii (Rice 1967(Rice , 1973, P. varians (¼P. nigrescens) (Rice 1975), T. pyroides (Rice 1967), T. alutacea (Rice 1976), S. cumanense (Rice 1988), A. parvulus (Rice 1981).…”

Section: Introductionmentioning

confidence: 99%

“…nigra) (Rice 1967), Golfingia misakiana (¼Apionsoma misakiana) (Rice 1978), G. pellucida (¼N. pellucidum) (Rice 1976(Rice , 1981, P. agassizii (Rice 1967(Rice , 1973, P. varians (¼P.…”

Section: Introductionmentioning

confidence: 99%

“…The first and, so far, the only attempt to synthesize information on the time and conditions during the breeding season and the specific features of embryogenesis and larval development in the different species of sipunculans is a work of Rice (1967) performed on laboratory maintained specimens of three East-Pacific (British Columbia) species (P. agassizii, Golfingia puggetensis (¼T. nigra), and T. pyroides).…”

Section: Introductionmentioning

confidence: 99%

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Embryonic and larval development of the peanut wormPhascolosoma agassizii(Keferstein 1867) from the Sea of Japan (Sipuncula: Phascolosomatidea)

Adrianov

Maiorova

Малахов

2011

Invertebrate Reproduction & Development

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All stages of the embryonic and larval development of Phascolosoma agassizii from Peter the Great Bay (Sea of Japan) were studied and illustrated using light and electron microscopy. The eggs of P. agassizii have the form of an ellipsoid (long and short axes about 100 and 70 mm, respectively). Egg cleavage is typical, spiral, and unequal. Gastrulation occurs by epiboly. This species possesses two pelagic larval stages, a lecithotrophic trochophore and a planktotrophic pelagosphera. The transformation of trochophore into pelagosphera occurs 80-90 h after fertilization. After 120-180 h, the larva has developed all systems of organs characteristic of the pelagosphera and is capable of feeding. At day 10, pelagospheras can settle, for some time, on the aquarium bottom and move on a ciliated lip, collecting food with the aid of a buccal organ. In addition, the larvae periodically attach themselves to the aquarium bottom or to the surface film of the water by means of a terminal organ. The trunk of the larva elongates by enlargement of the region behind the dorsal anal opening, which is located almost in the middle of the trunk region in the 15-day old larva. In the laboratory, 1-month old larvae spend the greater part of time in the attached state. Being attached by a glandular terminal organ to the aquarium bottom, they characteristically bend the body, actively feeding on microalgae from the substratum surface. The differences in the development of P. agassizii in the isolated West-Pacific and East-Pacific populations are shown and discussed.

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Cellular and muscular growth patterns during sipunculan development

et al. 2011

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Sipuncula is a lophotrochozoan taxon with annelid affinities, albeit lacking segmentation of the adult body. Here, we present data on cell proliferation and myogenesis during development of three sipunculan species, Phascolosoma agassizii, Thysanocardia nigra, and Themiste pyroides. The first anlagen of the circular body wall muscles appear simultaneously and not subsequently as in the annelids. At the same time, the rudiments of four longitudinal retractor muscles appear. This supports the notion that four introvert retractors were part of the ancestral sipunculan bodyplan. The longitudinal muscle fibers form a pattern of densely arranged fibers around the retractor muscles, indicating that the latter evolved from modified longitudinal body wall muscles. For a short time interval, the distribution of S-phase mitotic cells shows a metameric pattern in the developing ventral nerve cord during the pelagosphera stage. This pattern disappears close to metamorphic competence. Our findings are congruent with data on sipunculan neurogenesis, as well as with recent molecular analyses that place Sipuncula within Annelida, and thus strongly support a segmental ancestry of Sipuncula.

show abstract

A comparative study of the development ofPhascolosoma agassizii,Golfingia pugettensis, andThemiste pyroideswith a discussion of developmental patterns in the Sipuncula

Cited by 44 publications

References 7 publications

Re-evaluating the phylogeny of Sipuncula through transcriptomics

Re-evaluating the phylogeny of Sipuncula through transcriptomics

Embryonic and larval development of the peanut wormPhascolosoma agassizii(Keferstein 1867) from the Sea of Japan (Sipuncula: Phascolosomatidea)

Cellular and muscular growth patterns during sipunculan development

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