An Ultrastructural Study of Oogenesis in a Planktonic and A
Direct-Developing Species of Siphonaria (Gastropoda: Pulmonata)

Pal, Purba; Hodgson, Alan N.

doi:10.1093/mollus/68.4.337

Cited by 17 publications

(14 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vitellogenesis in marine molluscs is a complex process involving both autosynthetic and heterosynthetic pathways that contribute to the accumulation of more than one type of storage product (Eckelbarger & Young 1997, Dreon et al 2002, Pal & Hodgson 2002, Matsumoto et al 2003. Various kinds of yolk components in this group may be formed in many different ways, directly or indirectly, from the Golgi bodies, mitochondria, or nucleolar material, or independently in the cytoplasm (Eckelbarger & Davis 1996, Osada et al 2003.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural studies of oogenesis in the variable abalone Haliotis varia (Vetigastropoda: Haliotidae)

Najmudeen¹

2008

Aquat. Biol.

View full text Add to dashboard Cite

Ultrastructural features of the ovary as well as oogenesis were examined in the variable abalone Haliotis varia with the help of transmission electron microscopy. Based on the ultrastructure, the female germ cells were divided into 5 stages; oogonia, pre-vitellogenic, early vitellogenic, late vitellogenic and mature oocytes. Oogonia were supported by follicle cells that lined up the inner walls of the ovary. Vitellogenesis in H. varia commenced at about 50 µm oocyte diameter, with a major contribution by the autosynthetic pathway. Lipid droplets and protein yolk granules, measuring 2.3 ± 0.2 and 2.5 ± 0.3 µm, respectively, were observed in late vitellogenic and mature oocytes. Vitellogenic oocytes were encircled by a vitelline envelope consisting of a single layer of about 2.3 µm thickness. Numerous microvilli were embedded in the vitelline envelope. Cytoplasmic inclusions such as cortical granules, lipid droplets, mitochondria and yolk granules constituted the fundamental components of the mature oocyte. The cortical granules were arranged beneath the oolemma at the cortex of the oocyte. Oocyte degeneration in H. varia was observed in all stages of oocyte development, except in oogonial cells and pre-vitellogenic oocytes.

show abstract

Section: Introductionmentioning

confidence: 99%

Ultrastructural studies of oogenesis in the variable abalone Haliotis varia (Vetigastropoda: Haliotidae)

Najmudeen¹

2008

Aquat. Biol.

View full text Add to dashboard Cite

show abstract

“…Various cytoplasmic constituents have been proposed as being involved in the formation of yolk granules as well as lipid droplets of various sizes. These were documented by Pal and Hodgson (2002), Amor et al (2004) and Roy et al (2016).…”

Section: Discussionmentioning

confidence: 76%

Histological and ultrastructural studies on oogenesis of the freshwater bivalve Caelatura (Horusia) parreyssi (Philippi, 1848)

Awad

Mustafa

2018

Egypt. J. of Aquatic Biolo. and Fish.

View full text Add to dashboard Cite

Oogenesis Histology UltrastructureThe present study was carried out to describe the ovary and oogenesis in the freshwater bivalve Caelatura parreyssi from histological and ultrastructural points of view. Ten adult healthy clams collected from the River Nile were used in this study. The specimens were dissected and gonads were obtained and processed for histological and ultrastructural examination. Histologically, the ovary of C. parreyssi is composed of numerous of follicles which are connected together by connective tissue. Each follicle contains different stages of developing oocytes; oogonia, previtellogenic oocytes, vitellogenic oocytes and postvitellogenic oocytes (mature oocytes). At ultrastructural level, stages of female gametogenesis were examined; the process of oocytes formation and yolk deposition were described in successive stages of oogenesis. The structure and function of auxiliary cells and follicle cells in ovarian follicles during vitellogenesis were discussed. In conclusion, this study showed that the follicle cells play an important role during oogenesis but probably are not the major source of yolk precursors. The vesicular connective tissue is probably the main source of nutrients for vitellogenesis. The auxiliary cells appear to play an integrate role in the development of the oocytes as their functions can permit a transfer of precursors necessary to vitelogenesis.

show abstract

“…It differs from Williamia radiata (RutHenSteineR et al 2007) in having a much smaller and single penis gland, inserted on the penis tip. For additional details of the siphonariid genital structures see PaL & HodGSon (2002, 2003, 2005 and PaL (2007).…”

Section: Discussionmentioning

confidence: 99%

“…Though most of them are entirely terrestrial, some primitive taxa are marine, and depend on the pelagic environment to complete their development. Within the family Siphonariidae, most taxa have planktotrophic veliger larvae (JabLonSKi & Lutz 1983, GRaHame & bRancH 1985, although some species undergo intra-capsular larval stage -a mode of development sometimes called direct development (PaL & HodGSon 2002), a term that has been used for the siphonariids (cHambeRS & mcQuaid 1994a, b, PaL & HodGSon 2003, 2005. Planktonic larval development is regarded as plesiomorphic within the family, and used as a systematic criterion to resolve their higher taxonomy and evolutionary relationships.…”

Section: Introductionmentioning

confidence: 99%

Shell and body structure of the plesiomorphic pulmonate marine limpet Siphonaria pectinata (Linnaeus, 1758) from Portugal (Gastropoda: Heterobranchia: Siphonariidae)

Simone¹,

Seabra²

2017

Folia Malacol.

View full text Add to dashboard Cite

The shell and body structure of the plesiomorphic pulmonate false-limpet Siphonaria pectinata (Linnaeus) from the south coast of Portugal is presented in detail. All the systems are described and discussed, in order to create a phenotypic database, since the siphonariid relationships are controversial, and most of the recent attempts at their resolution have been molecular. Most siphonariids show several morphological peculiarities (e.g., flap-like head without tentacles, interrupted shell muscle, anterior portion of genitalia surrounding shell muscle) compared to the remaining pulmonates or even to heterobranchs. On the other hand, the odontophore structure, and the genital system, including the penis retractor muscle connected with the shell muscle, place them close to higher pulmonates. The siphonariids present a new mode of limpetisation, with the visceral structures placed inside the haemocoel instead of being located below the shell apex.

show abstract

An Ultrastructural Study of Oogenesis in a Planktonic and A Direct-Developing Species of Siphonaria (Gastropoda: Pulmonata)

Cited by 17 publications

References 29 publications

Ultrastructural studies of oogenesis in the variable abalone Haliotis varia (Vetigastropoda: Haliotidae)

Ultrastructural studies of oogenesis in the variable abalone Haliotis varia (Vetigastropoda: Haliotidae)

Histological and ultrastructural studies on oogenesis of the freshwater bivalve Caelatura (Horusia) parreyssi (Philippi, 1848)

Shell and body structure of the plesiomorphic pulmonate marine limpet Siphonaria pectinata (Linnaeus, 1758) from Portugal (Gastropoda: Heterobranchia: Siphonariidae)

Contact Info

Product

Resources

About