Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae)
Ultrastructural aspects of spermatogenesis, spermiogenesis and of the mature spermatozoon of a microcotylid monogenean Metamicrocotyla macracantha parasite from Mugil liza, are described. The irregularly-shaped spermatogonia divides by successive mitoses, forming the primary spermatocytes, identifie...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Fundação Oswaldo Cruz (FIOCRUZ)
1995-10-01
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| Series: | Memorias do Instituto Oswaldo Cruz |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761995000500010 |
| _version_ | 1797721269515321344 |
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| author | Maria de Fatima Diniz Baptista Farias Anna Kohn Ortrud Monika Barth |
| author_facet | Maria de Fatima Diniz Baptista Farias Anna Kohn Ortrud Monika Barth |
| author_sort | Maria de Fatima Diniz Baptista Farias |
| collection | DOAJ |
| description | Ultrastructural aspects of spermatogenesis, spermiogenesis and of the mature spermatozoon of a microcotylid monogenean Metamicrocotyla macracantha parasite from Mugil liza, are described. The irregularly-shaped spermatogonia divides by successive mitoses, forming the primary spermatocytes, identified by the presence of synaptonemal complexes in their nuclei. The spermatids formed by meiotic cell divisions of the secondary spermatocytes, differentiate into a mature spermatozoon. Cross sections of the head and the middle region of mature spermatozoa show the nucleus with strong condensed chromatin, the mitochondria with short cristae, peripheral microtubules and two axonemes with a 9+1 pattern, confirming the characteristics of this genus. |
| first_indexed | 2024-03-12T09:31:05Z |
| format | Article |
| id | doaj.art-4a84a286501c4a6b9595cacf62cd2694 |
| institution | Directory Open Access Journal |
| issn | 0074-0276 1678-8060 |
| language | English |
| last_indexed | 2024-03-12T09:31:05Z |
| publishDate | 1995-10-01 |
| publisher | Fundação Oswaldo Cruz (FIOCRUZ) |
| record_format | Article |
| series | Memorias do Instituto Oswaldo Cruz |
| spelling | doaj.art-4a84a286501c4a6b9595cacf62cd26942023-09-02T13:54:11ZengFundação Oswaldo Cruz (FIOCRUZ)Memorias do Instituto Oswaldo Cruz0074-02761678-80601995-10-0190559760410.1590/S0074-02761995000500010Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae)Maria de Fatima Diniz Baptista FariasAnna KohnOrtrud Monika BarthUltrastructural aspects of spermatogenesis, spermiogenesis and of the mature spermatozoon of a microcotylid monogenean Metamicrocotyla macracantha parasite from Mugil liza, are described. The irregularly-shaped spermatogonia divides by successive mitoses, forming the primary spermatocytes, identified by the presence of synaptonemal complexes in their nuclei. The spermatids formed by meiotic cell divisions of the secondary spermatocytes, differentiate into a mature spermatozoon. Cross sections of the head and the middle region of mature spermatozoa show the nucleus with strong condensed chromatin, the mitochondria with short cristae, peripheral microtubules and two axonemes with a 9+1 pattern, confirming the characteristics of this genus.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761995000500010ultrastructureMetamicrocotyla macracanthaMonogeneaspermatogenesisspermiogenesisspermatozoa |
| spellingShingle | Maria de Fatima Diniz Baptista Farias Anna Kohn Ortrud Monika Barth Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae) Memorias do Instituto Oswaldo Cruz ultrastructure Metamicrocotyla macracantha Monogenea spermatogenesis spermiogenesis spermatozoa |
| title | Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae) |
| title_full | Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae) |
| title_fullStr | Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae) |
| title_full_unstemmed | Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae) |
| title_short | Ultrastructural aspects of spermatogonesis in Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955 (Monogenea; Microcotylidae) |
| title_sort | ultrastructural aspects of spermatogonesis in metamicrocotyla macracantha alexander 1954 koratha 1955 monogenea microcotylidae |
| topic | ultrastructure Metamicrocotyla macracantha Monogenea spermatogenesis spermiogenesis spermatozoa |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761995000500010 |
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