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Polychaeta source details
Sato, Masanori. (2020). 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. Species Diversity. 25(1): 11-24.
365236
10.12782/specdiv.25.11 [view]
urn:lsid:zoobank.org:pub:1E0F263F-FDA3-4AB8-B93E-DD534C3B1CD0 [view]
Sato, Masanori
2020
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>
Species Diversity
25(1): 11-24
Publication
World Polychaeta Database (WPolyDb). Published online: '1 January 2020'
Available for editors
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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.
Japan
Systematics, Taxonomy
Composetia Hartmann-Schröder, 1985 (identification resource)
Composetia kumensis Sato, 2020 accepted as Potamonereis kumensis (Sato, 2020) (original description) Composetia microcephala (Grube, 1878) accepted as Leonnates microcephala (Grube, 1878) (new combination reference) Composetia moorei (Imajima, 1972) (new combination reference) Composetia tokashikiensis Sato, 2020 accepted as Potamonereis tokashikiensis (Sato, 2020) (original description) Composetia tripartita (Horst, 1918) accepted as Ceratonereis tripartita Horst, 1918 (new combination reference) Composetia versipedata (Ehlers, 1887) (new combination reference)
Holotype NSMT Pol H-766, geounit Ryukyu Islands, identified as Composetia kumensis Sato, 2020
Holotype NSMT Pol H-774, geounit Ryukyu Islands, identified as Composetia tokashikiensis Sato, 2020 Paratype NSMT Pol P-767-770, geounit Ryukyu Islands, identified as Composetia kumensis Sato, 2020 Paratype NSMT Pol P-771, 772, geounit Ryukyu Islands, identified as Composetia kumensis Sato, 2020 Paratype NSMT Pol P-773, geounit Ryukyu Islands, identified as Composetia kumensis Sato, 2020 Paratype NSMT Pol P-775-783, geounit Ryukyu Islands, identified as Composetia tokashikiensis Sato, 2020 Paratype NSMT Pol P-784, geounit Ryukyu Islands, identified as Composetia tokashikiensis Sato, 2020 Depth range Upper intertidal zone of uplifted coral reef. [details] Distribution Pacific Ocean: Kume-jima (Ryukyu Islands, southern Japan). [details] Distribution Pacific Ocean: Tokashiki-jima (Ryukyu Islands, southern Japan). [details] Etymology The specific epithet kumensis is an adjective derived from the name of the type locality, Kume-jima. [details] Etymology The specific epithet tokashikiensis is an adjective derived from the name of the type locality, Tokashiki-jima. [details] Habitat Sandy bottom with pebbles in a small creek originating from a freshwater spring within the upper intertidal zone of ... [details] Habitat Intertidal sandy bottom in the upper reaches of small estuary. Salinity of interstitial water that drained into the ... [details] Reproduction Coelom of two paratypes collected in March 2007 filled with large oocytes (about 250 μm and 150 μm, respectively, ... [details] Reproduction Coelom of a paratype collected in November 1991 filled with large oocytes (about 250 μm in maximum diameter). None ... [details] Taxonomy According to Villalobos-Guerrero et al. (2022), Ceratonereis moorei Imajima, 1972, "Perhaps belonging to the genus ... [details] Type locality Gushicha Gusuku, on Kume-jima Island, Okinawa Prefecture, central Ryukyu Islands, southern Japan, Pacific Ocean ... [details] Type locality Estuary of Tokashiki-gawa river, Tokashiki-jima Island, Okinawa Prefecture, central Ryukyu Islands, southern Japan, ... [details] |