Nipponbathynella wanjuensis, Park & Cho, 2015

Park, Jong-Geun & Cho, Joo-Lae, 2015, Redefinition of Nipponbathynella based on the four new species from East Asia (Crustacea: Bathynellacea: Parabathynellidae), Journal of Natural History 49 (37), pp. 2275-2307 : 2290-2295

publication ID	https://doi.org/ 10.1080/00222933.2015.1023226
DOI	https://doi.org/10.5281/zenodo.4328930
persistent identifier	https://treatment.plazi.org/id/03CDB43A-4831-FFF8-FE1D-F2453FACFC18
treatment provided by	Carolina
scientific name	Nipponbathynella wanjuensis
status	sp. nov.

Treatment

Nipponbathynella wanjuensis sp. nov.

( Figures 11–14 View Figure 11 View Figure 12 View Figure 13 View Figure 14 )

Etymology

The specific name is derived from the county (Wanju-Gun; gun means county) where the species was collected

Material examined

Type material

Holotype. Male, dissected on six slides. South Korea, Jeollabuk-Do (province), Wanju-Gun (county), Yongjin-Myeon (town), Gueok-Ri (village). A sand bank of Mankyeonggang (35°52'21.1 ''N, 127°9'36.4'' E). 14 March 2014 (J.-L. Cho and J.-G. Park) ( NIBR IV0000267101 View Materials ). No allotype and paratype. GoogleMaps

Description of adult male (holotype)

Body ( Figure 11A View Figure 11 ). Elongated and cylindrical, length 1.85 mm, approximately 10 times as long as wide. Head as long as wide, shorter than anterior three thoracic segments combined.

Antennule ( Figure 11B View Figure 11 ) six-segmented. First segment with one seta on inner distal margin, with two simple dorsal setae and with each one plumose seta dorso-laterally and ventro-laterally. Second segment with one group of four plumose setae, with one simple seta on inner distal margin. Third segment with two lateral setae, one seta on inner distal margin and with one ventral seta inner laterally. 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 being slightly protruded. Fifth segment with a medial group of two inner setae, one dorsal aesthetasc and one dorsal simple seta, and distally with three setae, two dorsal aesthetascs, one dorsal seta and one lateral aesthetasc. Sixth segment as large as one half of the fifth segment, with three subterminal aesthetascs and four simple setae.

Antenna ( Figure 11C View Figure 11 ) two-segmented, as long as the length of the first antennular segment. Proximal segment without setae, distal segment with two simple terminal setae and one subterminal seta.

Labrum ( Figure 11D View Figure 11 ) flat, with 10 median teeth of more or less similar size flanked by three (left) or four (right) lateral teeth. Inner surface concave, with two pairs of nipplelike lateral protrusions and with ctenidia and one tiny projection in middle region.

Mandible ( Figure 11E View Figure 11 ) with incisor process of three teeth. Tooth of ventral edge triangular. Spine row consisting of four spines. Palp of one segment, with one apical seta not exceeding incisor process in length.

Maxillule ( Figure 11F View Figure 11 ) two-segmented. Proximal segment with four setae on inner distal margin. Distal segment with two terminal spines, with three spines and one small spine on inner edge, and with three simple setae on outer distal margin. Distalmost spine with two dentils.

Maxilla ( Figure 12A View Figure 12 ) four-segmented, setal formula 2-4-9-7.

Thoracopods I–VII ( Figures 12B–E View Figure 12 , 13A–C View Figure 13 , 14A View Figure 14 ) increasing in size up to thoracopod III, thoracopods III–VII similar in size. Thoracopods II–VII each bearing one epipod on protopod. Basis of thoracopods I–VII with one seta each. Exopod of thoracopod I one-segmented with one medial seta on ventral margin. Exopod of thoracopods II–VII two-segmented. Endopods of thoracopods I–VII four-segmented, setal formulae:

Thoracopod I 2 + 0/1 + 1/0 + 1/3(1)

Thoracopods II 0 + 0/2(1)+1/0 + 1/2(0).

Thoracopods III–VII0 + 0/1 + 1/0 + 1/2(0).

Thoracopod VIII ( Figure 14B View Figure 14 ) bell-shaped tilting backwards in lateral view, 1.2 times longer than wide. Protopod massive, with penial region of three lobes: frontal lobe smooth and with undulated margin; dentate lobe with 14 teeth; inner lobe spinulated, in form of bur. Epipod long, round distal end reaching penial region. Basis nearly trapezoid, without distal spur, with one seta. Exopod one-third as long as basis, longer than wide, one-lobed and smooth. Endopod longer than wide, with one distal seta.

First pleopod absent ( Figure 11A View Figure 11 ).

Uropod ( Figure 14C, E View Figure 14 ) with load-shaped sympod bearing 14 spines on inner margin. Most distal spine significantly thicker than others decreasing in size distally. Endopod 23.1% as long as sympod length, drawn into spur, with two setae on the outer basis of spur. Inner margin of spur serrated. Exopod longer than endopod, 39.1% as long as sympod, with one outer seta, two terminal setae and one inner medial seta. Inner seta strong, longer and thicker than outer terminal seta.

Pleotelson ( Figure 14E View Figure 14 ) without seta.

Anal operculum slightly protruded.

Furcal rami ( Figure 14D View Figure 14 ) nearly square, with two distal spines and nine additional spines on inner margin, and dorsally with two plumose setae of different length and ventrally with furcal organ.

Female unkonwn.