Nipponbathynella wanjuensis Park & Cho 2015, sp. nov.
Creators: name: Park, Jong-Geun
name: Cho, Joo-Lae
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Bathynellacea
Parabathynellidae
Nipponbathynella
Nipponbathynella wanjuensis

description: Nipponbathynella wanjuensis sp. nov.
(Figures 11–14)
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). No allotype and paratype.
Description of adult male (holotype)
Body (Figure 11A). 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) 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) 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) 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) 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) 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) four-segmented, setal formula 2-4-9-7.
Thoracopods I–VII (Figures 12B–E, 13A–C, 14A) 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) 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).
Uropod (Figure 14C, E) 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) without seta.
Anal operculum slightly protruded.
Furcal rami (Figure 14D) 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.
description: Published as part of Park, Jong-Geun & Cho, Joo-Lae, 2015, Redefinition of Nipponbathynella based on the four new species from East Asia (Crustacea: Bathynellacea: Parabathynellidae), pp. 2275-2307 in Journal of Natural History 49 (37) on pages 2290-2295, DOI: 10.1080/00222933.2015.1023226, http://zenodo.org/record/4000033