Reproduction and development of common species of peanut worms (Sipuncula) from the Sea of Japan

Adrianov, Andrey V.; Maiorova, Anastassya S.

doi:10.1134/s1063074010010013

Cited by 27 publications

(22 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Egg sizes of P. agassizii in the San Juan Islands are approximately 1.5 times larger than those in the Sea of Japan. Additionally, the spawning season and the duration of the trochophore stage are longer in eastern Pacific populations compared to those from the Sea of Japan (Adrianov & Maiorova ). This has previously been explained by differences in water temperatures between the two geographic regions: the Sea of Japan typically experiences more variability in temperature throughout the year than do the San Juan Islands (Adrianov & Maiorova ).…”

Section: Introductionmentioning

confidence: 98%

“…The life cycle of Phascolosoma agassizii includes two pelagic larval stages. The first is a short‐lived lecithotrophic trochophore stage, while the second stage, or pelagosphera, is planktotrophic and can spend up to several months in the water column (Rice ; Adrianov & Maiorova ), potentially facilitating long‐distance dispersal and gene flow. However, an analysis of P. agassizii 's phylogeography within the Pacific Ocean by Schulze et al .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cryptic species in Pacific sipunculans (Sipuncula: Phascolosomatidae): east‐west divergence between non‐sister taxa

et al. 2015

View full text Add to dashboard Cite

2016). Cryptic species in Pacific sipunculans (Sipuncula: Phascolosomatidae): east-west divergence between non-sister taxa.-Zoologica Scripta, 45, 455-463. Cryptic diversity, i.e. diversity observable in genetic but not in morphological traits, is prevalent in marine invertebrates and presents one of the greatest obstacles to obtaining accurate estimates of species richness. Sipunculans, commonly called peanut worms, are marine annelids in which high levels of cryptic diversity have previously been documented.In this study, we use genetic identification techniques to examine divergence of two lineages of Pacific sipunculans, both known under the name Phascolosoma agassizii. One lineage is isolated to the eastern Pacific coast while the other one inhabits the western Pacific coast. These clades are reciprocally monophyletic and are not recovered as sister taxa, suggesting relatively early divergence within Phascolosoma. Furthermore, we did not find support for a genetic distinction between the western Pacific Phascolosoma agassizii agassizii and Phascolosoma agassizii kurilense, a subspecies reported from the Kuril Islands. Considering that the type locality for P. agassizii is in the Eastern Pacific, we suggest that the western clade, including the samples from the Kuril islands, represent a new, undescribed species.

show abstract

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Cryptic species in Pacific sipunculans (Sipuncula: Phascolosomatidae): east‐west divergence between non‐sister taxa

et al. 2015

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

“…They are benthonic organisms containing a coelom but no body segments (Yang & Sun 2006;Mu et al 2013). While the majority of species are dioecious, exert sexual reproduction and external fertilization, and in some individual species asexual reproduction, is also observed (Mary 1970;Maiorova & Adrianov 2007, 2010. The earliest observation of fertilization in Golfingia vulgaris (de Blainville, 1827) and Phascolopsis gouldii (De Pourtalès, 1851) was made by Gerould (1907).…”

Section: Introductionmentioning

confidence: 92%

The cytological changes of sperm and oocyte nuclei during fertilization inPhascolosoma esculenta(Sipuncula: Phascolosomatidea)

Long

Sheng

et al. 2015

Italian Journal of Zoology

View full text Add to dashboard Cite

In this study, we investigated fertilization cytology in Phascolosoma esculenta. The sperm binds to the oocyte envelope in a random position at the point of initial contact. An acrosomal reaction then occurs and the acrosomal filament penetrates the oocyte envelope. The apex of the acrosomal filament contacts with the plasma membrane of the oocyte at the point where the fertilization cone is formed. The fertilization cone then retracts, towing the acrosomal filament back and drawing the sperm into the oocyte. Subsequently, the pores on the oocyte envelope are blocked and filled with fibrin and colloid. After the oocyte is activated by sperm, the first and second meiosis processes start sequentially, followed by the release of the first and second polar bodies. After the second polar body is extruded, the haploid female nucleus rapidly reorganizes to form a female pronucleus. In comparison, the sperm nucleus begins to decondense and dilate after the first polar body is released. The male pronucleus is not formed until the end of the second meiosis. The male and female pronuclei migrate to the centre of the oosperm and are incorporated into the zygote nucleus and then the first cleavage occurs. A two cell embryo is then formed by plasma membrane invagination. The cytological changes of sperm and oocyte nuclei during sperm entry into the oocyte and the fertilization process in P. esculenta are characterized by: (1) the mature oocyte with fertilization ability being in the metaphase of the first meiosis; (2) sperm is drawn into the oocyte by the acrosomal filament and fertilization cone; (3) some abnormal phenomena such as polyspermy, multiple pronuclei and multipolar spindle; and (4) the male pronucleus is formed earlier than the female pronucleus, at which point they will fuse to form a zygote nucleus.

show abstract

Reproduction and development of common species of peanut worms (Sipuncula) from the Sea of Japan

Cited by 27 publications

References 13 publications

Cryptic species in Pacific sipunculans (Sipuncula: Phascolosomatidae): east‐west divergence between non‐sister taxa

Cryptic species in Pacific sipunculans (Sipuncula: Phascolosomatidae): east‐west divergence between non‐sister taxa

Re-evaluating the phylogeny of Sipuncula through transcriptomics

The cytological changes of sperm and oocyte nuclei during fertilization inPhascolosoma esculenta(Sipuncula: Phascolosomatidea)

Contact Info

Product

Resources

About