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Vol. 49 No. 6, 2010
A New Species of Hagfish Eptatretus
rubicundus (Myxinidae: Myxiniformes) from Taiwan, with Reference
to Its Phylogenetic Position Based on Its Mitochondrial DNA Sequence
Chien-Hsien
Kuo1, Sin-Che Lee2, and Hin-Kiu Mok3,*
1Department
of Aquatic Bioscience, National Chiayi University, Chiayi 600, Taiwan
2Institute of Cellular and Organismic Biology,
Academia Sinica, Taipei 115, Taiwan
3Institute of Marine Biology, National Sun-Yat-Sen
University, Kaohsiung 804, Taiwan
Chien-Hsien
Kuo, Sin-Che Lee, and Hin-Kiu Mok (2010) A new species of
hagfish, Eptatretus rubicundus
sp nov., collected from the northeastern coast of Taiwan is
described. Eptatretus
rubicundus sp. nov. was diagnosed by the branchial slime pores
and gill apertures arranged in a straight line, the distances from a
branchial pore to its immediate preceding and posterior gill apertures
were similar; the ventral aorta was not bifurcated; and the combination
of the following characters: 5 pairs of gill pouches and gill
apertures, gill apertures not crowded, 100-104 total slime pores
including those in the branchial region, branchial ducts of
approximately the same lengths, the pharyngocutaneous-duct opening
fused to the posteriormost left gill aperture, the 1st pair of afferent
branchial arteries located between the 1st and 2nd gill pouches, a pair
of low, round nasal papillae without supporting cartilage on the roof
of the nasal tube, and a pink body. The mitochondrial 16S
ribosomal RNA gene fragment sequences confirmed the most basal position
of E. rubicundus sp. nov. in
the Eptatretinae. Gene-sequence data on phylogenetic
relationships of the species in the previously recognized genera of
Quadratus, Paramyxine, and Eptatretus
indicated that these genera are not all monophyletic and suggested that
they should be combined into a single genus under the generic name Eptatretus.
Key words: Eptatretus
rubicundus sp. nov., Myxinidae, Phylogeny, Taiwan.
*Correspondence: E-mail:hinkiu@faculty.nsysu.edu.tw
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