Arisubathynella cheongmiensis Park & Eun 2012, n. sp.
Creators: name: Park, Jong-Geun
name: Eun, Ye
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Bathynellacea
Parabathynellidae
Arisubathynella
Arisubathynella cheongmiensis

description: Arisubathynella cheongmiensis n. sp.
(Figs. 1 – 4)
Type material. Holotype: male, dissected and mounted on six slides. South Korea, Kyeonggi-Do, Yeoju-Gun, Jumdong-Myon, Dori (37°13’54.6” N, 127°43’4.1” E), 12. March 2010, (J.-L. Cho) (NIBR IV0000242682). Allotype: female, dissected and mounted on six slides, same data as for holotype (NIBR IV0000242683). Paratypes: 3 males and 2 females each mounted as a whole specimen on a slide (NIBR IV0000242684 – IV0000242688), one male and one female each dissected and mounted on six slides (NIBR IV0002242689, IV0000242690), same data as for holotype.
Description of adult male (Holotype). Body length 1.03 mm (other males: 0.94–1.01 mm). Approximately 16 times wide. Head slightly longer than anterior two thoracic segments together (Fig. 1A).
Antennule (Fig. 1B) six-segmented. First segment with one seta on inner distal corner, with one simple dorsal seta and with one dorso-lateral, one medio-lateral and one ventro-lateral plumose seta. Second segment with one group of four plumose setae and with one simple seta on inner distal corner. Third segment with one seta on inner distal corner, two lateral simple setae of very unequal size and one simple ventro-lateral seta. Inner flagellum of third segment with three simple setae. Fourth segment with one stub seta and one plumose seta on dorsal margin, and with two stub setae and two plumose setae on outer distal apophysis. Fifth segment with three simple setae on inner distal margin and three dorsal aesthetascs. Sixth segment with three subterminal aesthetascs of different size and four simple setae.
Antenna (Fig. 1C) three-segmented, as long as first antennular segment. Two proximal segments without setae, distal segment with two simple setae of different size and one plumose seta terminally. Plumose seta as long as long simple seta.
Labrum (Fig. 1D) flat, with eight median teeth of more or less similar size flanked by two smaller distally dentate teeth on both sides. Inner surface with one nipple-like protrusion and six rows of ctenidia on both sides.
Mandible (Fig. 1E) with incisor process of three teeth. Tooth of the ventral edge absent. Lobe with row consisting of five spines. Palp of one segment, four times as long as wide, with one apical seta.
Maxillule (Fig. 1F) two-segmented. Proximal segment with four setae on inner distal margin. Distal segment with two terminal smooth spines, three dentate spines on inner edge and with three simple setae of different size on outer distal margin.
Maxilla (Fig. 1G) four-segmented, setal formula 0-4-7-7.
Thoracopods I – VII (Figs. 2A, B, 3A, B, C, 4A, B, C) similar in size except thoracopod I. Thoracopods II – V each with one epipod. Thoracopods I, VI-VII without epipod. Basipod of thoracopods I – VII with one seta at inner distal corner. Exopod of thoracopod I one-segmented, with one medial seta on ventral edge and terminally with one long seta and one shorter plumose seta. Exopods of thoracopods II – VII two-segmented. Proximal segment being longer than distal one and with one dorsal and one ventral seta. Distal segment with one long seta and one plumose seta terminally. Endopods of thoracopods I – VII four-segmented, setal formulae:
Thoracopod I 0+0/1+1/0+1/3(1)
Thoracopod II – VII 0+0/0+1/0+1/2(1)
Thoracopod VIII (Figs. 2C, D, E) bell-shaped in lateral view, 1.2 times longer than wide. Main axis tilting backwards. Protopod massive with prominent penial region displaying distal opening encircled by frontal, dentate and with inner lobe. Frontal and inner lobe smooth. Dentate lobe with seven tiny denticles. External lobe (epipod) conical in lateral view, balloon-shaped in ventral view, exceeding penial region in lateral view. Basipod as large as half protopod, with one basipodal seta near base of endopod. Exopod one third the size of basipod, two-lobed distally; upper lobe smooth, lower lobe with bifurcate tooth. Endopod small with two termintal setae.
First pleopod in form of seta (cf. Fig. 2F).
Uropod (Fig. 4D, E) with sympod bearing five spines. Most distal spine thicker and longer than the others which are of similar size. Endopod 40 % as long as sympod, with one large, fused, distal spur and two much smaller spines at its base, two simple setae and one plumose seta on outer distal margin. Exopod longer than endopod, with one basi-ventral seta and distally with one subterminal latero-internal seta, one projection and two terminal setae, of which the outer seta is six times longer than the inner one.
Pleotelson (Figs. 4D, F) with one seta near base of furcal rami. Anal operculum slightly convex. Furcal rami slightly longer than wide, with five spines and two setae, of which the longer one is plumose.
Description of adult female (Allotype). The female differs from the male in the protopod of thoracopod VI and in thoracopod VIII. Body length1.05 (other females: 0.95 – 1.05mm). Protopod of thoracopod VI (Fig. 4B) with tubular protrusion directed inwards. Distal margin of protrusion undulate. Thoracopod (Fig. 2F) form of two tiny teeth on hemispherical plate.
Etymology. The specific epithet is derived from a tributary of the Han-River (Cheongmi Stream), where the new species was discovered.
description: Published as part of Park, Jong-Geun & Eun, Ye, 2012, A new species and a new genus of Parabathynellidae (Crustacea, Syncarida) from South Korea, pp. 291-299 in Zootaxa 3368 (1) on pages 292-297, DOI: 10.11646/zootaxa.3368.1.15, http://zenodo.org/record/5252539