Allobathynella wonjuensis, Park & Cho, 2016

Park, Jong-Geun & Cho, Joo-Lae, 2016, Fourteen new species of Allobathynella Morimoto and Miura, 1957 from South Korea: with a redescription of A. coreana Morimoto, 1970 (Crustacea, Bathynellacea, Parabathynellidae), Journal of Species Research 5 (1), pp. 49-156 : 139-146

publication ID	https://doi.org/ 10.12651/JSR.2016.5.1.049
persistent identifier	https://treatment.plazi.org/id/039B482E-FF84-1E7D-FF3B-FA00FB6BFC1E
treatment provided by	Felipe
scientific name	Allobathynella wonjuensis
status	sp. nov.

Treatment

Allobathynella wonjuensis sp. nov. ( Figs. 77-82 View Fig View Fig )

Etymology

The species name is derived from the name of the city (Wonju-Si), where the material was collected.

Material examined

Holotype (adult female), allotype (adult male), paratypes (three adult females and two adult males). Holotype dissected on six slides ( NIBR IV0000266881 ) . Allotype dissected on six slides ( NIBR IV0000266882 ). Seven female paratypes and eight male paratypes each as a whole specimen on separate slides ( NIBR IV0000266883-266895 ) .

Type locality South-Korea, Gangwondo, Wonju-Si Jijeong-Myeon

Wolho-dong (37°22′32.0″N, 127°51′18.0″E). 07 June 2011, leg. J.-G. Park.

Description

Size (mm). Body length: Ş 1.85 mm (other females: 1.75 mm- 1.80 mm), ♂: 1.82 mm (other males: 1.70-1.78 mm), approximately 12 times as long as wide. Head slightly shorter than anterior four thoracic segments combined ( Fig. 77A View Fig ). Male differs from female in protopod of thoracopod VI and thoracopod VIII.

Antennule ( Fig. 77B View Fig ) 6-segmented. First segment with one seta on inner distal margin, with two simple dorsal setae and with four plumose setae. Position of each plumose setae: dorsally, dorso-laterally, laterally and ventro-laterally. Second segment with one group of four plumose setae and with each two simple setae dorsally and ventrally on inner distal margin. Third segment with two lateral setae including one plumose seta, with one ventrolateral seta, and two dorsal seta and two ventral setae on inner distal margin. Inner flagellum of third segment with three simple setae. Fourth segment with one stub setae and one plumose seta on dorsal margin, and with two stub setae and two plumose setae on outer distal apophysis. Fifth segment distally with three simple setae and one small plumose seta, two dorsal aesthetascs, one simple seta and one aethetasc, and dorso-medially with two simple setae. Sixth segment with three subterminal aesthetascs and four simple setae.

Antenna ( Fig. 77C View Fig ) 7-segmented, as long as the length of antennular segments 1-5. Setal formula: 0 + 0/0 + 0/1 + 0/1 + 1/0 + 0/1 + 1 + 1/4(1).

Labrum ( Fig. 77D View Fig ) flat, with eight main teeth flanked by three teeth on both lateral sides. Ventral surface concave, with one round median smooth projection, two pairs of teats and with numerous combs of ctenidia.

Mandible ( Fig. 77E View Fig ) with incisor process of four teeth. Tooth of ventral edge absent. Spine row consisting of eight spines. Palp of one segment, with one terminal seta.

Maxillule ( Fig. 78A View Fig ) two-segmented. Proximal segment with four setae on inner distal margin and ctenidia. Distal segment with two terminal smooth spines, with three smooth spines and two spines bearing basal bristles on inner edge, and with three simple setae on outer distal margin. Terminal spine two times as long as other ones.

Maxilla ( Fig. 78B View Fig ) four-segmented, setal formula 3-4- 9-6.

Thoracopods I-VII ( Figs. 78C, D View Fig , 79A, B, 80A View Fig , 81A, B View Fig ). Thoracopod I-IV increasing in size posteriorly. Thoracopods IV-VII similar in size. Thoracopods III-VII each bearing one epipod on the protopod. Basipod with two distal setae in thoracopod I, with one distal seta in thoracopods II-VI, with each one distal and median seta

142 JOURNAL OF SPECIES RESEARCH Vol. 5, No. 1

C A B D C, D A, B

in thoracopod VII. Number of segments of the exopod of the thoracopods I-VII: 2-3-4-4-5-5-4. Exopodal segments with each one dorsal and ventral seta, except basal segment bearing one ventro-medial seta in thoracopods I and II, lacking dorsal seta in thoracopods III, IV, V and VII, and lacking dorsal and ventral setae in thoracopod VI. Tiny process present between two setae of distal segment. Dorsal seta on distal segment of exopod barbed with strong hairs. Endopod of the thoracopods I-VII four-segmented, setal formulae:

Thoracopod I 1 + 1/2 + 2/1 + 1/4(2)

Thoracopod II 1 + 1/2 + 2/0 + 1/4(2)

Thoracopods III-IV 1 + 1/1 + 2/0 + 1/4(2)

Thoracopods V-VII 0 + 1/1 + 2/0 + 1/3(1)

Dorso-median seta of second segment extremely short.

Thoracopod VIII of male ( Fig. 80 View Fig B-E) perpendicular to body, in form of a bell in lateral view, 1.3 times longer than wide. Protopod with a prominent penial region bearing a distal opening. Frontal margin of penial region undulated, inner margin (dental lobe) with 11 teeth. Epipod flat, with round distal part not reaching lower margin of exopod. Basipod with one small seta near base of endopod, inner margin with tiny dentils and spinules, distally drawn out into round projection. Basipodal seta half as long as endopod. Exopod one third of size of basipod, round, with two distal serrated lobes. Endopod small, round, with two distal setae of different size. Out- er seta 2.5 times longer than inner one. Thoracopod VIII of female ( Fig. 79C) conical in ventral view, with two spine-like distal projections.

First pleopod ( Fig. 79D) in form of stub bearing two distal setae.

Uropod ( Fig. 82A, D View Fig ) bearing eight spines on inner margin of sympod, most distal spine significantly larger than other ones of similar size. Endopod 59% as long as sympod, with two dorsal plumose setae near the base, with two terminal setae and one subterminal plumose seta on outer margin and with one terminal spine, one subterminal spine and three additional spines along inner margin. The terminal spine longer than subterminal one. Most distal spine of inner margin smaller than subterminal one, 50% as large as terminal one. Three proximal spines of inner-margin small, one third as large as distal one. Exopod shorter than endopod (46% of sympod), with five setae including one basi-ventral seta.

Pleotelson ( Fig. 82 View Fig B-D) without seta. Anal operculum nearly flat, slightly convex.

Furcal rami ( Fig. 82 View Fig B-D) 1.5 times as long as wide, with two large distal spines, and three successively smaller spines on inner margin, and with two dorsal plumose setae.

dIscussIon