Two deep-sea eels collected from the Western Pacific Ocean are described in this study. Based on their morphological characteristics, the two deep-sea eel specimens were assumed to belong to the cusk-eel family Ophidiidae and the cutthroat eel family Synaphobranchidae.
Methods and results
To accurately identify the species of the deep-sea eel specimens, we sequenced the mitochondrial genes (cytochrome c oxidase subunit I [COI] and 16S ribosomal RNA [16S rRNA]). Through molecular phylogenetic analysis based on mtDNA COI and 16S rRNA gene sequences, these species clustered with the genera Bassozetus and Synaphobranchus, suggesting that the deep-sea eel specimens collected are two species from the genera Bassozetus and Synaphobranchus in the Western Pacific Ocean, respectively.
Conclusions
This is the first study to report new records of the genera Bassozetus and Synaphobranchus from the Western Pacific Ocean based on COI and 16S rRNA genes
Cheek muscles of 16 species of all Korean cobitid species belong to six genera were examined and described in detail, with
comments on their phylogenetic relationships made on the basis of characteristics of cheek muscles. Korean cobitids were divided
into two groups, the Cobitis and Misgurnus groups, by five characters related to three cheek muscles (adductor mandibulae, preorbitalis, and retractor arcus palatine).
The former group, comprising Cobitis, Iksookimia, Kichulchoia, Koreocobitis, and Niwaella, is defined by four apomorphies, and the latter, including Misgurnus, by a single apomorphy. 相似文献
A new mullid fish, Parupeneus procerigena, is described on the basis of 13 specimens (118.9–198.4 mm SL) from depths of 92–148 m off the Saya de Malha Bank in the
western Indian Ocean. This species resembles P. chrysopleuron and P. heptacanthus in color pattern without black stripes or spots, but it differs from them in having more gill rakers, two scales in lachrymal
region, deeper body, deeper cheek, and longer distance between nostrils.
Received: April 4, 2000 / Revised: July 27, 2000 / Accepted: August 27, 2000 相似文献
Barbels of the Mullidae and Polymixiidae were observed osteologically and myologically. They were considered to be derived
from branchiostegal rays. Four muscles, the extensor tentaculi, retractor tentaculi, and two sections of rotator tentaculi,
were related to the barbels in both families. These muscles originate from almost all the hyoid bones in mullids, whereas
they originate only from the ventral hypohyal and fifth branchiostegal ray in polymixiids. In addition, each muscle related
to the barbel of the former is independent from others, but that of the latter is interconnected. These muscular differences
indicate that the barbels occurring in the two families are nonhomologous.
Received: August 27, 2000 / Revised: April 11, 2001/ Accepted: May 13, 2001 相似文献
Upeneus australiae sp. nov. is described on the basis of 14 specimens collected from Australian waters. Although it belongs to the seven-spined
group of Upeneus, now comprising five species, U. australiae is distinguished from its congeners by the combination of the following characters: 6–7 + 16–18 (modally 7 + 17) gill rakers,
ectopterygoids without teeth, five and six black oblique bars on upper and lower caudal lobes, respectively, and peritoneum
transparent with small black spots.
Received: July 26, 2001 / Revised: November 2, 2001 / Accepted: December 4, 2001 相似文献
