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
| Autor: | Yusof Shuaib Ibrahim, Siti Syazwani Azmi, Masanori Sato, Pornsan Sumpuntarat, Saowapa Angsupanich |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Neanthes Annelida media_common.quotation_subject 010607 zoology Zoology South China Sea 010603 evolutionary biology 01 natural sciences Songkhla Lagoon Demersal zone Chaeta trochophore Neanthes glandicincta natatory chaetae Animalia Nereididae Metamorphosis Kuala Ibai Ecology Evolution Behavior and Systematics media_common Larva Polychaete geography geography.geographical_feature_category biology Polychaeta Estuary biology.organism_classification Phyllodocida QL1-991 Trochophore pelagic larvae Animal Science and Zoology |
| Zdroj: | ZooKeys 1011: 1-24 ZooKeys, Vol 1011, Iss, Pp 1-24 (2021) |
| ISSN: | 1313-2970 1313-2989 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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