Protanguilla palau, Palauan primitive cave eel : fisheries

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Protanguilla palau Johnson, Ida & Sakaue, 2012

Palauan primitive cave eel
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> Anguilliformes (Eels and morays) > Protanguillidae (Protoanguillids)
Etymology: Protanguilla: Name from the Greek 'protos' meaning first, and Latin 'anguilla' for eel; referring to the early divergence of the genus among anguilliforms.;  palau: Named for its type locality; noun in apposition (Ref. 87802).

Environment: milieu / climate zone / depth range / distribution range 生態学

海 関連する礁; 深さの範囲 35 - ? m (Ref. 87802). Tropical; 9°N - 6°N, 134°E - 135°E

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Western Pacific: Republic of Palau. Presently known from a western fringing reef of Ngemelis Island, in a reef cave at 35 m depth. As an elopomorph, it almost certainly has a leptocephalus larval form, and letptocephali (particularly those of anguilliforms) are known to have long planktonic durations (2-10 months). Accordingly, the authors believe that Protoanguilla probably has a considerably broader distribution than currently known, even though no leptocephali matching its unique meristic formula (fewer than 90 vertebrae, more than 170 dorsal fin and anal fin rays) have been identified in extensive worldwide larval fish collections. In any case, historically, the Protoanguilla lineage, estimated to have diverged ca 200Ma, must have been much more widely distributed, because the Palau-Kyushu Ridge formed only around 60-70 Ma (Ref. 87802).

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 17.6 cm TL (female)

簡単な記述 形態学 | 形態計測学

Gill opening terminates as ovoid tube with low, fringed collar; pseudobranch present; knob-like, toothed gill rakers present; premaxilla present, autogenous; symplectic autogenous; metapterygoid present; anterior end of vomer with small, ovoid, autogenous toothplate; body relatively short, total vertebrae 87 or fewer (79–87, mean ¼ 83.3); hypurals 3 and 4 not fused to each other; pterosphenoid not excluded from posterior margin of orbit (Ref. 87802).

生物学     用語集 (例 epibenthic)

Cave species (Ref. 87802).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

Johnson, G.D., H. Ida, J. Sakaue, T. Sado, T. Asahida and M. Miya, 2012. A 'living fossil' eel (Anguilliformes: Protanguillidae, fam. nov.) from an undersea cave in Palau. Proc. Royal Soc. B 279(1730):934-943. (Ref. 87802)

IUCNのレッドリストの状況は (Ref. 130435)

  欠足データ (DD) ; Date assessed: 21 November 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

水産業:
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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 1.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.5   ±0.6 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).