Male Reproductive System Morphology and Spermatophore Formation in Astacus Leptodactylus (Eschscholtz, 1823) (Decapoda: Astacidae)

Erkan, Melike; Tunali, Yasemin; Sancar-Bas, Serap

doi:10.1651/08-2991.1

Cited by 24 publications

(22 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The epithelial cells of the MVD of H. gammarus [24] are higher than the epithelial cells of the PVD. Besides this, the epithelial cells of the MVD vary from flat to cubic in C. quadricarinatus [22].…”

Section: Testismentioning

confidence: 77%

“…Ando and Makioka [21] state that the epithelium of the oviduct may be related to fertilization that may occur in the oviduct. However, it is strongly suggested that the oviduct epithelial secretion rather plays the role of helping in the destruction of spermatophores and the protection of eggs against microorganisms [24], since only external fertilization is observed in H. gammarus, C. quadricarinatus [25] and A. leptodactylus [23].…”

Section: Ovarymentioning

confidence: 99%

“…The testis morphology of H. gammarus shows similarities to H. americanus [14] and N. norvegicus [37], both species of Nephropidae, but C. quadricarinatus [22] (Parastacidae) differs from A. leptodactylus [24] (Astacidae).…”

Section: Testismentioning

confidence: 99%

“…Spermatogenesis in H. gammarus is synchronous like in A. leptodactylus and P. clarkii [21,24]. In contrast, C. quadricarinatus, Parastacus defossus and Samastacus spinifrons all show asynchronous spermatogenesis [22,38,39].…”

Section: Testismentioning

confidence: 99%

“…In the PVD the connective tissue and muscle fibers surround the epithelial layer in H. gammarus, while the same region consists of very thick connective tissue and striated muscles in H. americanus [14]. In H. gammarus the primary spermatophore layer begins to cover the sperm mass in the PVD as seen in C. quadricarinatus [22], however this layer only appears in the MVD in A. leptodactylus [24]. The primary spermatophore layer begins to surround the sperm mass in the second segment of the PVD in Homarus americanus [14].…”

Section: Testismentioning

confidence: 99%

See 4 more Smart Citations

Morphological and histochemical examination of male and female gonads in Homarus gammarus (L. 1758)

Erkan

Ayun

2013

Open Life Sciences

Self Cite

View full text Add to dashboard Cite

The reproductive organs of both male and female European lobsters (Homarus gammarus) are H-shaped gonads that lie dorsal to the gut on the large hepatopancreas. The ovary consists of a pair of tubular, parallel lobules with a connecting bridge. The germarium of the ovary containing oogonia is concentrated in the center of the ovarian lobe. As oogonesis proceeds, the oocytes move to the peripheral regions of the ovary. The follicle cells begin to surround the oocytes in the previtellogenic stage, and the mature oocytes are completely surrounded by the follicle cells. Carbohydrates exist in both early and late vitellogenic oocytes that give PAS positive reaction. However, their rising protein content in late vitellogenic oocytes makes them stain with Bromophenol blue. Testes show convoluted lobules with a germinal epithelium and a central collecting duct, and the paired vasa deferentia have three distinct parts. Spermatophores are nonpedunculate and tubular, which extrude as a continuous column and consist of a sperm mass covered with primary and secondary layers. The primary layer stains with Bromophenol Blue and gives a PAS positive reaction. But the secondary layer only weakly stains with Bromophenol Blue. The histochemical results may indicate that the function of the two layers is different.

show abstract

Section: Testismentioning

confidence: 77%

Section: Ovarymentioning

confidence: 99%

Section: Testismentioning

confidence: 99%

Section: Testismentioning

confidence: 99%

Section: Testismentioning

confidence: 99%

See 3 more Smart Citations

Morphological and histochemical examination of male and female gonads in Homarus gammarus (L. 1758)

Erkan

Ayun

2013

Open Life Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

Functional anatomy of the male reproductive system of the American lobster (Homarus americanus)

Comeau

Benhalima

2018

Journal of Morphology

View full text Add to dashboard Cite

Despite supporting a valuable fishery, the reproductive system of the male American lobster (Homarus americanus) is poorly understood. The elongated H-shaped testis is responsible for spermatogenesis and is composed of follicles, a common collecting duct with interlaced scattered striated muscles, and a serosa as an external wall. Sertoli cells are associated with the spermatogenesis that produces spermatozoa, which are transferred to the collecting duct through a temporary passageway. Spermatogenesis is asynchronous between follicles and occurs on a continuous basis. The anterior and posterior lobes of the testes are independent and connect to the vasa deferentia through the Y-shaped collecting tubules that have a different cell anatomy and function than the two organs they connect. The vas deferens is divided into four regions. Spermatophores, produced in the proximal vas deferens, are packets of spermatozoa encapsulated in a single layer-the spermatophoric wall, which is composed of mucopolysaccharide acid. Large dense ovoid granules and the seminal fluid, composed of acidic sulfated mucosubstances, are secreted in the median vas deferens. Spermatophores within these secreted substances (i.e., semen) are stored in the distal vas deferens that, with the spermiduct (last region of the vas deferens), is responsible for the extrusion of the semen by striated muscle contractions. Smooth muscles suggest a peristaltic movement of the spermatophores within the vas deferens. Finally, the gonopores and the first pair of pleopods (i.e., gonopod) move the semen to the female seminal receptacle during copulation.

show abstract

Functional anatomy of the female reproductive system of the American lobster (Homarus americanus)

Comeau

Benhalima

2018

Journal of Morphology

View full text Add to dashboard Cite

Light microscopy studies of the female American lobster Homarus americanus reproductive system are essentially nonexistent or outdated. Based on samples taken in the spring, summer, and autumn from the southern Gulf of St. Lawrence between 1994 and 2014, and using a combination of histological and scanning electron microscope techniques, we propose an ovarian cycle with 10 stages, identifying for the first time a recovery stage. Also, an atypical resorption stage, characterized by massive reabsorption of mature oocytes, is occasionally observed during summer months. The oviducts are composed of connective tissue (elastic and collagen fibers) with no muscle or secretory activities. Their epithelium shows a cyclic pattern and phagocytosis activities linked to spawning. Although the role of the seminal receptacle is to store and protect semen, free spermatozoa (i.e., without the spermatophoric wall and the acellular gelatinous substance that constitute the semen) were also observed in its posteriolateral grooves immediately prior to spawning, which is consistent with an external fertilization mechanism at the seminal receptacle. Unexpectedly, free spermatozoa were observed externally near two pore‐like structures located on the gonopore's operculum, not at the seminal receptacle, after spawning; hence, more work is needed to fully understand the fertilization mechanism for the American lobster.

show abstract

Male Reproductive System Morphology and Spermatophore Formation in Astacus Leptodactylus (Eschscholtz, 1823) (Decapoda: Astacidae)

Cited by 24 publications

References 48 publications

Morphological and histochemical examination of male and female gonads in Homarus gammarus (L. 1758)

Morphological and histochemical examination of male and female gonads in Homarus gammarus (L. 1758)

Functional anatomy of the male reproductive system of the American lobster (Homarus americanus)

Functional anatomy of the female reproductive system of the American lobster (Homarus americanus)

Contact Info

Product

Resources

About