- 著者
- Koichi Hoshino Kunpei Kosaka Kota Sawada Masashi Kiyota
- 出版者
- The Japanese Society of Systematic Zoology
- 雑誌
- Species Diversity (ISSN:13421670)
- 巻号頁・発行日
- vol.27, no.1, pp.1-13, 2022-01-01 (Released:2022-01-01)
- 参考文献数
- 57
An oreosomatid of the genus Allocyttus McCulloch, 1914 is fished commercially on the Emperor Seamounts. However, the species’ identity is uncertain, as is the taxonomy of the oreosomatid species of the seas around Japan, where the names Allocyttus verrucosus Gilchrist, 1906 (type locality: off South Africa) and A. folletti Myers, 1960 (type locality: off California) have both been used. From its anticipated susceptibility to over-exploitation, it is urgent to establish the correct taxonomic identity to facilitate effective management measures. Meristics, morphometrics and scale characters of the specimens from the Emperor Seamounts and Japan agreed well with data of the holotype of A. folletti and differed from those of A. verrucosus, confirming that those specimens represent A. folletti. Oreosomatids reported from the western North Pacific in the literature were identified as A. folletti. From the data of the present study and historical references, A. folletti is thought to be distinguished from A. verrucosus by the following characters: more dorsal- and anal- spines+rays (36–42 vs. 33–38 and 31–35 vs. 27–33 respectively), more total vertebrae (37–41 vs. 34–38), greater numbers of enlarged scales of dorsal- (S-DFB) and anal-fin base (S-AFB) (31–42 vs. 26–31, and 29–37 vs. 25–28 respectively), more spines on the margin of S-DFB and S-AFB (up to 7–12 vs. 3–6), a shorter preanal-fin length (53.8–63.6% vs. 64.8–83.7% of SL), a longer caudal peduncle (10.4–15.6% vs. 6.1–10.2% of SL), a shorter head (32.9–40.4% vs. 38.5–48.4% of SL), and cycloid scales on the mid-side of body (vs. ctenoid). Available data indicate that A. folletti reaches up to 537 mm SL, larger than A. verrucosus (up to ca. 325 mm SL). From the anticipated slow growth and longevity, concern is raised regarding the susceptibility of A. folletti to over-exploitation.
- 著者
- Makoto Okamoto Hiroyuki Motomura Koichi Hoshino Takashi Yanagimoto Toshiro Saruwatari
- 出版者
- The Japanese Society of Systematic Zoology
- 雑誌
- Species Diversity (ISSN:13421670)
- 巻号頁・発行日
- vol.17, no.1, pp.1-5, 2012-05-25 (Released:2018-03-30)
- 参考文献数
- 21
Two specimens (124.0-148.6mm standard length) of a scorpionfish, Idiastion pacificum Ishida and Amaoka, 1992, were collected from the central North Pacific, representing the first record of the species from this area. This finding extends the distributional range of Idiastion pacificum, which was previously known only from the Kyushu-Palau Ridge, western North Pacific. This study provides new morphological data and a color photograph of I. pacificum based on these two additional specimens, with a comparison to Idiastion kyphos Eschmeyer, 1965.