Corresponding author: Seong Myeong Yoon (
Academic editor: Christopher Glasby
A detailed description and illustrations of a new terebellid species are provided, and molecular information based on partial sequences of the mitochondrial cytochrome c oxidase subunit I (
Choi HK, Kim H, Yoon SM (2020)
The genus
To date, 12 species of
Samples were collected from the benthos of the deep sea (500–1000 m depth). Specimens were sorted using sieves with a mesh size of 0.5 mm, initially fixed with 5% formaldehyde-seawater solution, and transferred to 85% ethyl alcohol. Characteristics of the whole body were observed with appendages dissected in a petri dish using dissection forceps or surgical knives and needles under a stereomicroscope (SMZ1500; Olympus, Tokyo, Japan). Dissected specimens were mounted onto temporary slides using glycerol or permanent slides using polyvinyl lactophenol solution. Drawings were made under the stereomicroscope and light microscope (LABOPHOT-2; Nikon, Tokyo, Japan) with the aid of drawing tubes. Photographs were taken of appendages mounted on a permanent slide. Images of appendages were captured using an imaging system (LAS V4.7, Leica Microsystems, Heerbrugg, Switzerland). Specimens for scanning electron microscopy (
Genomic DNA was extracted from posterior segments of three specimens selected among additional materials using a DNeasy Blood and Tissue Kit (Qiagen, Hilden, Germany) according to manufacturer’s protocol. Amplifications of partial sequences of mitochondrial cytochrome c oxidase subunit I (
South Korea, East Sea (Sea of Japan),
Body with distinct thoracic and abdominal region. Tentacular lobe collar-like. Peristomium with fleshy ridge on ventral side. Upper lip distinct and undulate with free margin. Lower lip well developed, projecting forward. Buccal tentacles filiform with ventral groove. Lateral lappets present on segments 2–4, well developed on segments 2 and 3, reduced on segment 4. 12 ventral shields from segment 3. Branchiae dichotomous with distinct stalk, 3 pairs, and present on segments 2–4. Nephridial papillae small, oval on segments 3–15, located between noto- and neuropodia. Notopodia present on 19 chaetigers on segment 4. Notochaetae medially winged and distally serrated. Neuropodia beginning at segment 5. Uncini avicular, short-handled, arranged in single row on segments 5–10, in double rows of beak to beak arrangement from segments 11–22, and in single row on all abdominal segments. Dental formula MF: 4–5: 5–6: 7–8. Pygidium reduced with 10 papillae.
Holotype: complete, 11.0 cm long, 1.5 cm wide at segments 10, and with approximately 74 segments. Body uniformly light beige in alcohol, without pigmentation pattern, and consist of thorax with 19 chaetigers and abdomen; anterior thoracic segments compact until about 13 and then segments slightly narrower and longer than 13 anterior segments (Figs
A combination of the Latin
This species is found on the soft bottom of deep waters (500–1000 m depth) and lives in a mud tube.
In
In East Asia, three
In this study, partial
GenBank accession numbers for
Species | Genbank accession number | Data source |
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Siddall et al. 2011 |
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Maximum likelihood (
1 | Notopodia present on first 15 chaetigers |
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– | Notopodia present on more than first 15 chaetigers |
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2 | Notopodia present on first 17 chaetigers |
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– | Notopodia present on more than first 17 chaetigers |
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3 | Thoracic neuropodial tori extending to ventral shield or mid-ventral groove |
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– | Thoracic neuropodial tori not extended |
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4 | Nephridial papillae on segments 3–11 |
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– | Nephridial papillae on segment 3 only |
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5 | Segments 4 with small lateral lappets |
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– | Segments 4 without lateral lappets |
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6 | Nephridial papillae 6 pairs on segments 3–8 |
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– | Nephridial papillae 9 pairs on segments 3–11 |
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7 | Thorax with 39 notopodial chaetigers; lateral lappets on segment 2 inconspicuous |
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– | Thorax with less than 30 notopodial chaetigers; lateral lappets on segment 2 conspicuous |
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8 | Abdominal neuropodial tori with uncini arranged in double rows present on almost all chaetigers |
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– | Abdominal neuropodial tori with uncini arranged in double rows absent, or present on first and second abdominal chaetigers only |
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9 | Notopodia present on 19 thoracic chaetigers |
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– | Notopodia present on more than 20 thoracic chaetigers |
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10 | First abdominal chaetiger with uncini arranged in single row |
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– | First abdominal chaetiger with uncini arranged in double rows |
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11 | Nephridial papillae 7 pairs |
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– | Nephridial papillae at least 10 pairs |
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12 | Ventral shields 13; nephridial papillae 10 pairs |
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– | Ventral shields 14; nephridial papillae 12 pairs |
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This study was supported by the National Institute of Biological Resources (