The sperm ultrastructure of <i>Merluccius merluccius</i> (Teleostei, Gadiformes): phylogenetic considerations

Medina, Antonio; Megina, César; Abascal, F.J.; Calzada, Alfonso

doi:10.1046/j.1463-6395.2003.00138.x

Cited by 20 publications

(16 citation statements)

References 13 publications

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“…In R. sarba the two centrioles were arranged perpendicular to each other and the proximal centriole lies anterior to the distal centriole. This is consistent with the cases described in Acanthopagrus Schlegeli ) Acanthopagrus latus (Gwo, 1995), Merluccius merluccius (Medina et al, 2003) and Alestes dentex (Shahin , 2006a). I n the sparids, the proximal and distal centrioles lie within the nuclear fossa and are oriented at right angle to each other (Gwo et al, 2005).…”

Section: Discussionsupporting

confidence: 90%

Ultrastructure features of spermiogenesis and spermatozoa of sparid fish Rhabdosargus sarba (Forsskål, 1775) from Red SEA, Jeddah coast

Moharram¹,

Qari²,

El-Aweedy³

2014

IOSRJPBS

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Section: Discussionsupporting

confidence: 90%

Ultrastructure features of spermiogenesis and spermatozoa of sparid fish Rhabdosargus sarba (Forsskål, 1775) from Red SEA, Jeddah coast

Moharram¹,

Qari²,

El-Aweedy³

2014

IOSRJPBS

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“…With maturation in such biflagellar sperm no proximal centrioles can be seen and the two apical ends of the flagellar basal bodies attach to an electron-dense cytoplasmic plate, elegantly illustrated by Lahnsteiner (2003) for A. imberbis sperm. This plate resembles the lateral plates on which the flagella anchor in sperm of the gadiform Merluccius merluccius (Medina et al 2003). During this development the cytoplasmic collar is formed concomitant to the evolving membrane that unites and envelops the two flagella.…”

Section: Discussionmentioning

confidence: 94%

Testis structure, spermatogenesis, spermatocytogenesis, and sperm structure in cardinal fish (Apogonidae, Perciformes)

2005

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The testes in all 16 of the studied cardinal fish species are shown to be bilobed, with spermatogonia dispersed throughout the gametogenic epithelium of the seminiferous tubules. Each testicular lobe is covered luminally by an epithelium consisting of primary germ cells and Sertoli cells. At maturation the seminiferous tubules reach around 0.6-2.3 mm in length. They number from 60 in the smallest species to over 300 in the largest one, increasing both in dimension and number with increase in length of the male, and are species-specific. The highest number of spermatogonia is found at the apical ends of the tubules. During maturation extensions of Sertoli cells surround single or small groups of B-spermatogonia, forming the spermatocysts, the final dimensions of which reflect the final number of contained spermatozoids. Back-calculations of serial sections reveal that within the spermatocysts the spermatogonia undergo eight generations of mitotic divisions before the first and second meiotic divisions and formation of spermatids. The largest mature spermatocysts in large species attain around 180 microm in diameter, a volume of 25 mm(3), and contain around 8,200 spermatids. The total volume of sperm in the mature spermatocysts leaves enough space for the discarded cytoplasm and developing flagella. The bursting cysts liberate the ripe sperm and maturing spermatids, into the tubule lumen and spermduct, with the spermatids often still connected by cytoplasm bridges. The sperm, with one or two flagella, features round or oval heads and a cytoplasmic collar bearing a few mitochondria. The percentage of biflagellate or monoflagellate sperm differs in proportion in males of different lengths and in different species. Differences in spermatogenesis of small and larger species of cardinal fish are discussed.

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“…Nuclear rotation, which seems to be diagnostic to type I spermiogenesis (Mattei 1970), is also absent from the Nile catfish Chrysichthys auratus (Shahin 2006b) and from some teleosts with type II spermiogenesis (see Brusle 1981; Burns et al . 1998; Pecio and Rafiński 1999; Matos et al 2000; Medina 2003). In contrast, it has been reported that the nucleus rotates to only a slight degree in the cyprinid Cyprinus carpio , the esocid Esox lucius (Billard 1986), the cichlid Oreochromus niloticus (Lou and Takahashi 1989) and the characid Paracheirodon innesi (Jamieson 1991).…”

Section: Discussionmentioning

confidence: 99%

“…1995), Diplomystes mesembrinus (Quagio‐Grassiotto et al . 2001b), Merluccius merluccius (Medina 2003), Alestes dentex (Shahin 2006a) and Chrysichthys auratus (Shahin 2006b). Nonetheless, the two centrioles are orientated at right angles to each other in Anguilla japonica (Gwo et al .…”

Section: Discussionmentioning

confidence: 99%

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Semicystic spermatogenesis and biflagellate spermatozoon ultrastructure in the Nile electric catfish Malapterurus electricus (Teleostei: Siluriformes: Malapteruridae)

Shahin

2006

Acta Zoologica

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 Abstract Shahin, A. A. B. 2006. Semicystic spermatogenesis and biflagellate spermatozoon ultrastructure in the Nile electric catfish Malapterurus electricus (Teleostei: Siluriformes: Malapteruridae). -Acta Zoologica (Stockholm) 87 : 215-227Spermatogenesis and spermatozoon ultrastructure in the Nile electric catfish Malapterurus electricus are described using scanning and transmission electron microscopy. Although the testis organization conforms to the 'unrestricted' spermatogonial type, the species has a rare type of spermatogenesis not previously described among catfishes, 'semicystic', in which the cyst ruptures before the spermatozoon stage. Spermiogenesis also involves some peculiar features such as condensation of the chromatin in the posterior part of the nucleus to form a compact electron-dense mass with some irregular electronlucent lacunae, while the uppermost part of the nucleus is a loose electronlucent area, absence of the nuclear rotation and, as a consequence, the centriolar complex and the initial segment of each flagellum arise directly in a position perpendicular to the basal pole of the nucleus, and occurrence of numerous vesicles in the midpiece. In addition, spermiogenesis includes migration of the diplosome and mitochondria to the basal pole of the nucleus, formation of two moderate nuclear fossae, each of which contains the centriolar complex, development of two independent flagella and elimination of the excess cytoplasm. The mature spermatozoon has a more or less round head with no acrosome or acrosomal vesicle, a long midpiece with numerous mitochondria and vesicles and two long tails or flagella having the classical axoneme structure of 9 + 2 microtubular doublet pattern and with no lateral fins and membranous compartment. These findings suggest that the ultrastructural features of spermiogenesis and spermatozoa of M . electricus are synapomorphies of types I and II spermiogenesis and spermiogenesis is closely similar to the type described in the Nile catfish Chrysichthys auratus .

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The sperm ultrastructure of Merluccius merluccius (Teleostei, Gadiformes): phylogenetic considerations

Cited by 20 publications

References 13 publications

Ultrastructure features of spermiogenesis and spermatozoa of sparid fish Rhabdosargus sarba (Forsskål, 1775) from Red SEA, Jeddah coast

Ultrastructure features of spermiogenesis and spermatozoa of sparid fish Rhabdosargus sarba (Forsskål, 1775) from Red SEA, Jeddah coast

Testis structure, spermatogenesis, spermatocytogenesis, and sperm structure in cardinal fish (Apogonidae, Perciformes)

Semicystic spermatogenesis and biflagellate spermatozoon ultrastructure in the Nile electric catfish Malapterurus electricus (Teleostei: Siluriformes: Malapteruridae)

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