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Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula
The reproductive and developmental characteristics of the nereidid polychaete, Neanthes glandicincta Southern, 1921, commonly recorded in tropical estuaries in the Indo-West Pacific, were examined from Malaysia (the mangrove area of Kuala Ibai, Terengganu) and Thailand (the Lower Songkhla Lagoon) on...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Pensoft Publishers
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7835201/ https://www.ncbi.nlm.nih.gov/pubmed/33551646 http://dx.doi.org/10.3897/zookeys.1011.59780 |
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author | Azmi, Siti Syazwani Ibrahim, Yusof Shuaib Angsupanich, Saowapa Sumpuntarat, Pornsan Sato, Masanori |
author_facet | Azmi, Siti Syazwani Ibrahim, Yusof Shuaib Angsupanich, Saowapa Sumpuntarat, Pornsan Sato, Masanori |
author_sort | Azmi, Siti Syazwani |
collection | PubMed |
description | The reproductive and developmental characteristics of the nereidid polychaete, Neanthes glandicincta Southern, 1921, commonly recorded in tropical estuaries in the Indo-West Pacific, were examined from Malaysia (the mangrove area of Kuala Ibai, Terengganu) and Thailand (the Lower Songkhla Lagoon) on the east coast of the Malay Peninsula. Epitokous metamorphosis of fully mature males and females and their reproductive swimming behaviour were recorded based on ten Malaysian epitokous specimens, which were collected at night during spring tides in a period of January 2018 to March 2019. Six Thailand epitokes were obtained in February and March 2006 by the laboratory rearing of immature worms. Epitokous metamorphosis is characterised by the enlargement of eyes in both sexes, division of the body into three parts and modification of parapodia with additional lobes in the mid-body of males, and replacement of atokous chaetae in the mid-body by epitokous natatory chaetae, completely in males and incompletely in females. The diameter of coelomic unfertilised eggs in females was 100–140 µm. After fertilisation, each egg formed a jelly layer, inside which embryonic development progressed. Trochophores hatched out of the jelly layer, entering a short free-swimming larval phase followed by demersal life at the early stage of 3-chaetiger nectochaeta one day after fertilisation. Then, the larvae entered benthic life as juveniles, crawling on the bottom, at the late stage of 3-chaetiger nectochaeta two days after fertilisation. The results indicate that N. glandicincta has an annual life cycle, which is usually completed within an estuary with limited larval dispersal ability. |
format | Online Article Text |
id | pubmed-7835201 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Pensoft Publishers |
record_format | MEDLINE/PubMed |
spelling | pubmed-78352012021-02-04 Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula Azmi, Siti Syazwani Ibrahim, Yusof Shuaib Angsupanich, Saowapa Sumpuntarat, Pornsan Sato, Masanori Zookeys Research Article The reproductive and developmental characteristics of the nereidid polychaete, Neanthes glandicincta Southern, 1921, commonly recorded in tropical estuaries in the Indo-West Pacific, were examined from Malaysia (the mangrove area of Kuala Ibai, Terengganu) and Thailand (the Lower Songkhla Lagoon) on the east coast of the Malay Peninsula. Epitokous metamorphosis of fully mature males and females and their reproductive swimming behaviour were recorded based on ten Malaysian epitokous specimens, which were collected at night during spring tides in a period of January 2018 to March 2019. Six Thailand epitokes were obtained in February and March 2006 by the laboratory rearing of immature worms. Epitokous metamorphosis is characterised by the enlargement of eyes in both sexes, division of the body into three parts and modification of parapodia with additional lobes in the mid-body of males, and replacement of atokous chaetae in the mid-body by epitokous natatory chaetae, completely in males and incompletely in females. The diameter of coelomic unfertilised eggs in females was 100–140 µm. After fertilisation, each egg formed a jelly layer, inside which embryonic development progressed. Trochophores hatched out of the jelly layer, entering a short free-swimming larval phase followed by demersal life at the early stage of 3-chaetiger nectochaeta one day after fertilisation. Then, the larvae entered benthic life as juveniles, crawling on the bottom, at the late stage of 3-chaetiger nectochaeta two days after fertilisation. The results indicate that N. glandicincta has an annual life cycle, which is usually completed within an estuary with limited larval dispersal ability. Pensoft Publishers 2021-01-18 /pmc/articles/PMC7835201/ /pubmed/33551646 http://dx.doi.org/10.3897/zookeys.1011.59780 Text en Siti Syazwani Azmi, Yusof Shuaib Ibrahim, Saowapa Angsupanich, Pornsan Sumpuntarat, Masanori Sato http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Azmi, Siti Syazwani Ibrahim, Yusof Shuaib Angsupanich, Saowapa Sumpuntarat, Pornsan Sato, Masanori Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula |
title | Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes
glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula |
title_full | Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes
glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula |
title_fullStr | Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes
glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula |
title_full_unstemmed | Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes
glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula |
title_short | Epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, Neanthes
glandicincta Southern, 1921 (Annelida, Nereididae) on the east coast of the Malay Peninsula |
title_sort | epitokous metamorphosis, reproductive swimming, and early development of the estuarine polychaete, neanthes
glandicincta southern, 1921 (annelida, nereididae) on the east coast of the malay peninsula |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7835201/ https://www.ncbi.nlm.nih.gov/pubmed/33551646 http://dx.doi.org/10.3897/zookeys.1011.59780 |
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