Nereididae (Annelida) in Japan, with Special Reference to Life-History Differentiation Among Estuarine Species

Sato, Masanori

doi:10.1007/978-4-431-56432-4_19

Cited by 22 publications

(25 citation statements)

References 69 publications

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“…During a survey on nereidid fauna in subtropical small estuaries surrounded by coral reefs in the middle Ryukyu Islands in southern Japan, two morphologically similar undescribed species of Composetia Hartmann-Schröder, 1985 [as Ceratonereis (Composetia) in Sato (2012); see Sato and Sakaguchi 2016;Sato 2017] were found from a unique habitat exposing to usually fresh water, but sometimes full-strength sea water. Here, the two species are described as new species of Composetia.…”

Section: Introductionmentioning

confidence: 99%

Two New Species of Composetia (Annelida: Nereididae) from Small Estuaries in the Ryukyu Islands, Southern Japan, with a List of All Species Currently Belonging to Composetia

Sato

2020

Spec.Div.

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804

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http://zoobank.org/1E0F263F-FDA3-4AB8-B93E-DD534C3B1CD0 Two new species Composetia kumensis and C. tokashikiensis (Nereididae) are described based on specimens collected from subtropical small estuaries in the Kume-jima and Tokashiki-jima islands in the middle Ryukyu Islands, southern Japan, respectively. Both species have the following diagnostic characteristics of Composetia Hartmann-Schröder, 1985: (1) having conical paragnaths in the maxillary ring of the proboscis and lacking paragnaths or papillae in the oral ring, (2) prostomium with entire anterior margin, (3) the absence of falcigers among notochaetae, and (4) the absence of simple chaetae among upper neurochaetae. These new species share the following diagnostic characters: (1) presence of notoacicula on chaetigers 1 and 2, (2) absence of notopodial prechaetal lobe throughout body, (3) presence of neuropodial postchaetal lobe only in anterior body, (4) neuropodial falcigers all heterogomph, and (5) oral ring greatly enlarged in full-everted proboscis. However, C. tokashikiensis sp. nov. is distinguishable from C. kumensis sp. nov. by the presence of heterogomph spinigers among the upper neurochaetae around chaetiger 5. A list of all of 34 species currently belonging to Composetia and a key to Japanese species of Composetia are also provided.

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Section: Introductionmentioning

confidence: 99%

Two New Species of Composetia (Annelida: Nereididae) from Small Estuaries in the Ryukyu Islands, Southern Japan, with a List of All Species Currently Belonging to Composetia

Sato

2020

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804

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“…Estuarine nereidid polychaetes of the genus Hediste show a circumboreal distribution in the north temperate zones of the Pacific and Atlantic coasts and consist of the following five nominal species (Sato 1999(Sato , 2004(Sato , 2017: H. diversicolor (O. F. Müller, 1776) distributed along both the Northeast and Northwest Atlantic (Smith 1977), H. limnicola (Johnson, 1903) distributed along the Northeast Pacific (Smith 1958), and H. japonica (Izuka, 1908), H. diadroma Nakashima, 2003, andH. atoka Sato &Nakashima, 2003 (Sato & Nakashima 2003) distributed in Asia along the Northwest Pacific.…”

Section: Introductionmentioning

confidence: 99%

Larval recruitment process in the catadromous life history of Hediste diadroma (Nereididae, Annelida) in an estuary in Kagoshima Bay, Southern Japan

Kan

Kuroki

Sato

et al. 2020

Plankton Benthos Res

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The recruitment process of planktic larvae of the nereidid polychaete Hediste diadroma, which has a catadromous life cycle, was examined in an estuary in Kagoshima Bay, Southern Japan. Our laboratory experiments showed that the phototaxis of the planktic larvae changed drastically from positive to negative during the 3-chaetiger nectochaeta, 3.5-4.0 days after fertilization. During this stage, the prostomial antennae, first peristomial cirri, and anal cirri appeared and the ciliary bands used for swimming were reduced; these results suggest that larvae shifted from pelagic to demersal stage at approximately 4.0 days after fertilization. Field sampling took place in the estuary, where reproductive swarming of mature adults was observed in late February to April; planktic larvae of, mainly, 5-to 8-chaetiger stages were collected in evening high tides during the spring tides of April and May 1989, 2013, and 2015. During the same period, 5-or higher chaetiger benthic juveniles were collected at low tide from intertidal flats from a wide area of the estuary where adults inhabited. The morphology of benthic juveniles of 5-and 6-chaetiger stages differed from that of planktic larvae of the same stages in the following characteristics: (1) the long larva-specific spinigers were lost; (2) the second peristomial cirri, originating from the parapodial lobes of chaetiger 1 of the planktic larvae, appeared; and (3) the anal cirri were elongated. Our results indicate that 5-to 8-chaetiger nectochaeta are critical phases for the successful settlement of planktic larvae, which come back into an estuary with rising tides.

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“…Estuaries are an ecologically important habitat as the critical transition zone between freshwater and marine habitats (Levin et al 2001). In general, some euryhaline species of nereidid polychaetes are major components of the macrobenthic fauna in estuaries, playing important roles in nutrient cycling in an estuary ecosystem (Sato 2017). However, surveys on the nereidid fauna in Asian tropical and subtropical estuaries are insufficient.…”

Section: Introductionmentioning

confidence: 99%

Distributions and Variations of Two Estuarine Species of Composetia (Annelida: Nereididae) in the Ryukyu Islands, Southern Japan, with a New Record of Composetia tokashikiensis from Thailand

et al. 2020

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By the survey on the nereidid fauna in small estuaries in creeks in the Ryukyu Islands, southern Japan, two species of Composetia Hartmann-Schröder, 1985, C. kumensis Sato, 2020 (type locality: Kume-jima island, the Ryukyu Islands) and C. tokashikiensis Sato, 2020 (type locality: Tokashiki-jima island, the Ryukyu Islands) have been newly collected from 10 sites on 5 islands, and from 20 sites on 6 islands, respectively. In 26 of a total of 28 sites, one of the two species occurred exclusively, but both of them coexisted in two sites in Oura Bay on Okinawa-jima island. Morphological variations and genetic differentiations among the local populations of the two species were examined. Molecular analyses based on the partial sequences of the mitochondrial cytochrome c oxidase subunit I gene supported that the morphologically similar two species are certainly distinct species. In C. kumensis, marked genetic differentiation was detected among populations in the following three regions in the middle Ryukyu Islands: (1) northern Kume-jima, (2) southern Kume-jima, and (3) Okinawa-jima and Kikai-jima islands. In contrast, no marked genetic differentiation was detected among any populations of C. tokashikiensis in a wide range of the middle and southern Ryukyu Islands. A single specimen of C. tokashikiensis was also collected from an euryhaline area of the lower reaches of Songkhla Lagoon, southern Thailand. A morphological description of this specimen is provided here as a new record of this species from Thailand.

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Nereididae (Annelida) in Japan, with Special Reference to Life-History Differentiation Among Estuarine Species

Cited by 22 publications

References 69 publications

Two New Species of <i>Composetia</i> (Annelida: Nereididae) from Small Estuaries in the Ryukyu Islands, Southern Japan, with a List of All Species Currently Belonging to <i>Composetia</i>

Two New Species of <i>Composetia</i> (Annelida: Nereididae) from Small Estuaries in the Ryukyu Islands, Southern Japan, with a List of All Species Currently Belonging to <i>Composetia</i>

Larval recruitment process in the catadromous life history of <i>Hediste diadroma</i> (Nereididae, Annelida) in an estuary in Kagoshima Bay, Southern Japan

Distributions and Variations of Two Estuarine Species of <i>Composetia</i> (Annelida: Nereididae) in the Ryukyu Islands, Southern Japan, with a New Record of <i>Composetia tokashikiensis</i> from Thailand

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