Corresponding author: Gi-Sik Min (
Academic editor: L. Ernesto Bezerra
A new parabathynellid bathynellacean species,
Ji S-J, Lee C-W, Min G-S (2021) A new species of
The taxonomic study of Korean bathynellaceans was begun by
As suggested by the generic name, the genus
Distribution of species of the genus
Genomic DNA was extracted using the LaboPass Tissue Genomic DNA Isolation Kit Mini (Cosmo GENETECH, Seoul, South Korea) according to the manufacturer’s instructions. Partial
Body elongated and cylindrical. Antennule seven-segmented. Antenna seven-segmented. Incisor process of mandible with four teeth, a triangular proximal tooth, and molar process with more than six spines, with distal spine furcated distally. Maxilla four-segmented without medial seta on second segment. Exopod of thoracopods I–VII two-segmented. First endopodal segment of thoracopods I–VII with one tiny seta on outer distal margin. Male thoracopod VIII oval with massive protopod; epipod present in the form of gourd-shaped process reaching penial region; basis approximately half the size of protopod, without basial setae; endopod small, with two apical setae; exopod with two distal protuberances. Female thoracopod VIII as a one-segmented small process with tiny teeth and two distal setae. Pleopod absent. Uropod: protopod sympod with a row of homonomous spines; endopod with a spur distally, with two distal setae and two plumose setae on dorsal surface; exopod with a basi-ventral seta. Pleotelson with one lateral seta on each side. Anal operculum protruded. Furcal rami with four to six spines, and one long plumose seta, and one simple seta.
Seokhwa-ri (
Antennule seven-segmented without aesthetascs on the fifth segment, and with three simple setae on inner distal margin of the sixth segment; antenna seven-segmented with setal formula 0 + 0/0 + 0/1 + 0/1 + 1/0 + 0/0 + 2/4(1); labrum with 14 teeth; mandible palp two-segmented; maxilla four-segmented with setal formula 3-3(2)-10-6; exopod of thoracopods I–VII two-segmented; thoracopods III–VII each with an epipod; inner protuberance of male thoracopod VIII with three distal spinules; female thoracopod VIII with two teeth and two distal setae; uropod sympod with 8 to 10 spines of similar size; furcal ramus with 4 to 5 spines; anal operculum protruded.
Antennule (Fig.
Antenna (Fig.
Labrum (Fig.
Mandible (Fig.
Maxillule (Fig.
Maxilla (Fig.
Thoracopods I–VII (Figs
Thoracopod I | 2 + 1/2 + 1/1 + 1/3(1) |
Thoracopods II | 1 + 1/1 + 1/1 + 1/3(1) |
Thoracopods III, IV | 0 + 1/1 + 1/0 + 1/3(1) |
Thoracopods V–VII | 0 + 1/0 + 1/0 + 1/3(1) |
Thoracopod VIII (Figs
First pleopod absent (Fig.
Uropod (Fig.
Pleotelson (Fig.
Anal operculum (Fig.
Furcal rami (Fig.
The female differs from the male in thoracopod VIII. Thoracopod VIII (Fig.
Antenna (Fig.
Body length 0.91–1.14 mm in female (six individuals, NIBRIV0000881737–881742), 1.04–1.13 mm in male (five individuals, NIBRIV0000881732–881736). Uropod protopod with eight to nine, rarely 10 spines. Furcal rami mostly with four spines but five on one side in NIBRIV0000881724 (Fig.
The species name is derived from the stream (Miho, a tributary of the Geumgang River) in which the species was collected.
A total of 606 base pairs of
The new species belongs to the genus
Morphological differences among the five species of
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Labrum | no. teeth | 2+8+2 | 2+8+2 | 2+10+2 | 2+8+2 | 3+8+3 |
Mandible | palp segment | 1 | 1 | 1 | 1 | 2 |
no. of spines in spine row | 7 | 8 | 7 | 7 | 7 | |
Thoracopods | epipod in th.2 | present | present | present | present | absent |
no. basipod setae on th.1 | 1 | 2 | 2 | 2 | 2 | |
Male th.8 | no. protuberances on exopod | 2 | 1 | 2 | 2 | 2 |
Female th.8 | no. spinules | 3 | 3 | 8 | 4 | 2 |
Uropod | no. spines of protopod | 10–11 | 9 | 10 | 11 | 8–9 |
Furcal rami | no. of spines | 5 | 5 | 5 | 5–6 | 4–5 |
This work was supported by grants from the National Institute of Biological Resources (