Occurrence of biflagellate spermatozoa in Cetopsidae, Aspredinidae, and Nematogenyidae (Teleostei: Ostariophysi: Siluriformes)

Spadella, Maria Angélica; Oliveira, Cláudio; Quagio-Grassiotto, Iranı́

doi:10.1007/s00435-006-0018-9

Cited by 12 publications

(16 citation statements)

References 11 publications

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“…This set of characteristics is different from those previously described. This unusual process of spermiogenesis found in Corydoradinae, except for the eccentric development of the flagellum and nuclear fossa, was also observed in Cetopsidae and Aspredinidae (Spadella et al, 2006a).…”

Section: Spermiogenesis In Callichthyinaementioning

confidence: 85%

“…The occurrence of spermatids in the lumen of the testicular tubules together with spermatozoa in the species of Corydoradinae suggests that spermatogenesis in this subfamily is of the semicystic type. This type of spermatogenesis was described in Cetopsidae and Aspredinidae (Spadella et al, 2006a), and also found in Nematogenyidae (our unpublished data). Although uncommon, semicystic spermatogenesis has been described in others families of Teleostei such as Opheliidae (Mattei et al, 1993), Scorpaenidae (Muñoz et al, 2002), and Bleniidae (Lahnsteiner & Patzer, 1990).…”

Section: Spermiogenesis In Callichthyinaementioning

confidence: 94%

“…It is probable that a similar process occurs in Cetopsidae, Aspredinidae, and Nematogenyidae (Spadella et al, 2006a).…”

Section: Spermiogenesis In Callichthyinaementioning

confidence: 99%

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Comparative analysis of spermiogenesis and sperm ultrastructure in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)

2007

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In Corydoradinae, the presence of spermatids in the lumen of the testicular tubules together with spermatozoa suggests that spermatogenesis is of the semicystic type, whereas in Callichthyinae, sperm production occurs entirely within spermatocysts in the germinal epithelium, characterizing cystic spermatogenesis. Spermiogenesis in Callichthyinae is characterized by an initial lateral development of the flagellum, the presence of nuclear rotation to different degrees, an eccentric or medial formation of a nuclear fossa, formation of a cytoplasmic channel, and presence of centriolar migration, being more similar to type I spermiogenesis. In Corydoradinae, spermiogenesis is characterized by eccentric development of the flagellum, the absence of nuclear rotation, an eccentric nuclear fossa formation, formation of a cytoplasmic channel, and absence of centriolar migration, differing from the types previously described. The process of spermatogenesis and spermiogenesis in Corydoradinae and Callichthyinae revealed unique characters for each of these subfamilies, corroborating the hypotheses that they constitute monophyletic groups. In relation to sperm ultrastructure, the comparative analysis of the callichthyid species shows that the general characteristics found in the spermatozoa were similar, thus, reinforcing the hypothesis that the family is monophyletic.Em Corydoradinae, a presença de espermátides junto com espermatozóides no lúmen dos túbulos testiculares sugere uma espermatogênese do tipo semicística, enquanto que em Callichthyinae a produção do esperma ocorre inteiramente dentro dos espermatocistos no epitélio germinativo, caracterizando a espermatogênese cística. A espermiogênese em Callichthyinae é caracterizada por um desenvolvimento inicial lateral do flagelo, pela presença de rotação nuclear em diferentes graus, formação de uma fossa nuclear excêntrica ou medial, formação de um canal citoplasmático, e presença de migração centriolar, sendo mais similar à espermiogênese do tipo I. Em Corydoradinae, a espermiogênese é caracterizada pelo desenvolvimento excêntrico do flagelo, ausência de rotação nuclear, fossa nuclear excêntrica, formação de um canal citoplasmático, e ausência de migração centriolar, diferindo dos tipos descritos previamente. O processo de espermatogênese e espermiogênese em Corydoradinae e Callichthyinae revelaram caracteres únicos para cada subfamília, corroborando a hipótese de que as mesmas constituem grupos monofiléticos. Em relação à ultraestrutura do esperma, a análise comparativa das espécies de Callichthyidae mostra que as características gerais encontradas nos espermatozóides foram similares, reforçando a hipótese de monofilia da família.

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Section: Spermiogenesis In Callichthyinaementioning

confidence: 85%

Section: Spermiogenesis In Callichthyinaementioning

confidence: 94%

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Comparative analysis of spermiogenesis and sperm ultrastructure in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)

2007

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“…In fact, in one algal species, Hoops and Witman have presented evidence that they are not (Hoops and Witman, 1985). Turning to spermatozoa, synchronised beating might be expected in the biflagellate arrangement that has evolved in a few vertebrate groups (Spadella et al, 2006) but the motility has rarely been described. The only biflagellate spermatozoa to have been examined in the living state are those of the mollusc, Corbicula (Howard et al, 2004).…”

Section: M Woolley and Othersmentioning

confidence: 99%

A study of synchronisation between the flagella of bull spermatozoa, with related observations

Woolley

Crockett

Groom

et al. 2009

Journal of Experimental Biology

112

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SUMMARYFlagellar synchronisation has been observed between bull spermatozoa as they swam in a viscous medium, confined to a glass surface. This process is of interest in understanding the regulation of flagellar oscillation in general. Exact and persisting synchrony between bull spermatozoa occurred only when the spermatozoan heads were tightly coupled mechanically. For these cells, viscous coupling between the flagella was not by itself sufficient to establish synchronisation. Immediately on synchronisation, with the spermatozoan heads superposed, the paired spermatozoa showed rises in conjoint beat frequency, wave velocity and swimming velocity, i.e. in nearly all cases, the new conjoint values were greater than those shown by either of the two singleton spermatozoa. In our interpretation of these results, we put forward hydrodynamic arguments for seeing the primary change as a rise in wave velocity, via a decreased viscous resistance to bend propagation. Mechanistically, the rise in beat frequency is mysterious unless, as we suggest, it is consequential to the rise in wave velocity, and mediated by an as-yetunknown mechanical feedback process. The rise in swimming velocity is not surprising given the rise in wave velocity but there is evidence for an additional influence due to a subtle re-orientation of the conjoint spermatozoan heads, such that they experienced less frictional drag. Supplementary material available online at

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“…However, Lee (1998) and Kim and Lee (2000) describe the spermatozoa of Bagridaeas as being uniflagellate. The occurrence of biflagellate spermatozoa in Cetopsidae, Aspredinidae, and Nematogenyidae has been described by Spadella et al (2006). Proximal and distal centrioles are present in all known biflagellate spermatozoa (Spadella et al 2006).…”

Section: Introductionmentioning

confidence: 97%

Structural abnormalities of common carp Cyprinus carpio spermatozoa

Pšenička¹,

Rodina²,

Flajšhans³

et al. 2008

Fish Physiol Biochem

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Spermatozoa of common carp Cyprinus carpio are typically consist of a primitive head without acrosome, a midpiece with several mitochondria, a centriolar complex (proximal and distal centriole), and one flagellum. During an evaluation of the motility of common carp spermatozoa, we found spermatozoa with more than one flagellum and/or "double head" in three different individuals. This may be related to abnormal spermatogenesis. Ultrastructure and physiological parameters of spermatozoa were examined using light microscopy (dark field with stroboscopic illumination), transmission and scanning electron microscopy, and flow cytometry. The recorded pictures and videos were evaluated using Olympus MicroImage software. All spermatozoa with more than one flagellum had a larger head and shorter flagella. They occasionally demonstrated several cytoplasmic channels separating the flagella from the midpiece. Each flagellum was based upon its own centriolar complex, with the connection of the flagellum to the head always at a constant angle. The flagella always consisted of nine peripheral pairs and one central doublet of microtubules. Sperm exhibited a relative DNA content similar to that found in sperm from normal males, with higher coefficients of variation. Although similar abnormalities have been found in livestock, where they were described as a defect in spermiogenesis, no comparable results have been reported in fish. The frequency at which these abnormalities occurs, the fertilization ability of males with defects in spermiogenesis, the influence of these abnormalities on progeny in terms of ploidy level, and the occurrence of deformities warrant further investigation.

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Occurrence of biflagellate spermatozoa in Cetopsidae, Aspredinidae, and Nematogenyidae (Teleostei: Ostariophysi: Siluriformes)

Cited by 12 publications

References 11 publications

Comparative analysis of spermiogenesis and sperm ultrastructure in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)

Comparative analysis of spermiogenesis and sperm ultrastructure in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)

A study of synchronisation between the flagella of bull spermatozoa, with related observations

Structural abnormalities of common carp Cyprinus carpio spermatozoa

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