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Vol. 48 No. 3, 2009
Chaetopterid Polychaetes from Taiwan and Okinawa Island (Japan), with Descriptions of Two New Species
Eijiroh Nishi1,* and Hwey-Lian Hsieh2
1Manazuru Marine Laboratory, Yokohama National University, Iwa, Manazuru, Kanagawa 259-0202, Japan
2Biodiversity Research Center, Academia Sinica, Nankang, Taipei 115, Taiwan. E-mail:zohl@gate.sinica.edu.tw
Eijiroh Nishi and Hwey-Lian Hsieh (2009)
Chaetopterid polychaetes (Annelida: Spionida) were studied in
shallow-water sandy and muddy areas of Taiwan and Okinawa I.,
Japan. We found 4 species of the family, Mesochaetopterus japonicus Fujiwara, 1934, M. formosana sp. nov., Phyllochaetopterus verrilli Treadwell, 1943, and P. awasensis
sp. nov. The former 3 species were found in Taiwan, and the
latter 2 species at Okinawa. Mesochaetopterus formosana sp. nov.
is characterized by having 2 middle-region (region B) chaetigers.
These middle-region chaetigers are very long resulting in the middle
region being 1.5-2 times longer than the anterior region (region
A). Region A has 6-8 A4 modified cutting chaetae that have both
small and large teeth on the head. Phyllochaetopterus awasensis
sp. nov. is characterized by having 13 or 14 region A chaetigers,
approximately 20 region B chaetigers, A4 chaetae with small teeth on
the edge of the heads, and a tough brown chitinous tube. These
are the first records of Mesochaetopterus japonicus and P. verrilli in Taiwanese waters. We compared the species reported here with other Pacific chaetopterids.
Key words: Chaetopteridae, Mesochaetopterus, Phyllochaetopterus, Taiwan, Okinawa.
*Correspondence: Tel and Fax: 81-45-3393408. E-mail:enishi@ynu.ac.jp
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