Allobathynella munsui, 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 : 69-76

publication ID	https://doi.org/ 10.12651/JSR.2016.5.1.049
persistent identifier	https://treatment.plazi.org/id/039B482E-FFCA-1E07-FF3B-F833FE59F89B
treatment provided by	Felipe
scientific name	Allobathynella munsui
status	sp. nov.

Treatment

Allobathynella munsui sp. nov. ( Figs. 19-23 View Fig View Fig View Fig View Fig View Fig )

Etymology

The species name is derived from the Budist name of a monch (Munsu), who sacrificed his body against the project of the government willing to change the configu- ration of Korean rives.

Material examined

Holotype (adult female), paratype (adult female). Holotype dissected on seven slides ( NIBR IV0000266839 ) . Paratype as whole specimen on a slide ( NIBR IV 0000 266840) .

Type locality

South-Korea, Kyungsangbuk-Do, Cheongsoung-Gun, Pacheon-Myeon, Joongpyeong-Ri (36°28′36.1″N, 129° 01′50.3″E), 21. June 2012, leg. J.-L. Cho.

Description Size (mm). Body length: 3.41, approximately 12 times as long as wide. Head slightly shorter than anterior three thoracic segments combined ( Fig. 19A View Fig ).

Antennule ( Fig. 19B View Fig ) 7-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, respectively. Third segment with two lateral setae including one plumose seta, with one ventrolateral seta, and three dorsal setae 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 two simple setae and one small plumose seta, two dorsal aesthetascs and one simple seta and medially with one simple seta on inner margin. Sixth segment with four setae including one plumose seta on inner margin, and with two aesthetascs and one simple seta and one aesthetasc dorsally. Seventh segment with three subterminal aesthetascs and four simple setae.

Antenna ( Fig. 19C View Fig ) 7-segmented, as long as length of antennular segments 1-5. Setal formula: 0+ 0/0 + 0/1 + 0/1 + 1/0 + 0/1 + 1 + 1/5(1).

Labrum ( Fig. 19D View Fig ) flat, with 12 main teeth flanked by three teeth on both lateral sides. Ventral surface concave, with one tiny round median projections bearing two distal spinules, four pairs of teat and numerous combs of ctenidia.

Mandible ( Fig. 19E View Fig ) with incisor process of four teeth. Tooth of ventral edge absent. Spine row consisting of 11 spines. Palp of one segment, 2.5 times as long as wide,

with two apical setae of different length.

Maxillule ( Fig. 20A View Fig ) two-segmented. Proximal segment with numerous numbers of ctenidia and with four setae on inner distal margin. Distal segment with two terminal smooth spines and six serrated spines on inner edge, and with three simple setae on outer distal margin. Terminal spine two times larger than other ones.

Maxilla ( Fig. 20B View Fig ) four-segmented, setal formula 3-6- 10-6.

Thoracopods I-VII ( Figs. 20 View Fig B-D, 21A, B, 22A, B). Thoracopod I-IV increasing in size posteriorly. Thoracopods IV-VII similar in size. Thoracopods III-VII each bearing one epipod on protopod. Basipod with one distal seta in thoracopods I-IV, with each one distal and median seta in thoracopods V-VII. Number of segments of exopod of thoracopods I-VII: 4-6-7-7-7-7-7. Exopodal segments with each one dorsal and ventral seta, except basal segment having one additional medial seta on ventral margin of thoracopods V and VI and each one additional medial seta on ventral and dorsal margin of thoracopod VII. Tiny process present between two setae of distal segment. Dorsal seta on distal segment of exopod barbed with strong hairs. Endopod of thoracopods I-VII four-segmented, setal formulae:

Thoracopod I 2 + 1/3 + 2/2 + 1/4(2)

Thoracopod II 1 + 1/3 + 2/1 + 1/4(2)

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

Thoracopods IV-VI 1 + 1/3 + 2/0 + 1/4(2)

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

Dorso-median seta of second segment extremely short.

Thoracopod VIII ( Fig. 21C View Fig ) of female round in ventral view, with two (left) or three (right) spine-like distal projection.

First pleopod ( Fig. 22C View Fig ) in form of stub bearing two distal setae.

Uropod ( Fig. 23A View Fig ) bearing 15 spines of similar length on inner margin of sympod. Endopod 48% as long as sympod, with two dorsal plumose setae near base, with two terminal setae and one subterminal plumose seta on outer margin and with one terminal spine, one subterminal spine and four additional spines along inner margin. Terminal spine slightly longer than subterminal one. Most distal spine of inner-margin two thirds as large as subterminal spine and 4-5 times larger than proximal three ones of similar size. Exopod slightly shorter than endopod (42% of sympod), with nine setae inclusive of one basi-ventral seta.

Pleotelson ( Fig. 23B View Fig ) without seta. Anal operculum flat.

Furcal rami ( Fig. 23B View Fig ) 1.2 times as long as wide, with two large distal spines, and six (left) or five (right) successively smaller spines on inner margin, and with two dorsal plumose setae.