Allobathynella buronensis, 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 : 101-109

publication ID	https://doi.org/ 10.12651/JSR.2016.5.1.049
persistent identifier	https://treatment.plazi.org/id/039B482E-FFEA-1E20-FC9C-F94FFD70FEA5
treatment provided by	Felipe
scientific name	Allobathynella buronensis
status	sp. nov.

Treatment

Allobathynella buronensis sp. nov. ( Figs. 46-51 View Fig View Fig View Fig View Fig View Fig )

Etymology

The species name is derived from the town (Buron-Myeon), where the material was collected.

Material examined

Holotype (adult male), allotype (adult female), paratype (nine adult males). Holotype dissected on seven slides ( NIBR IV0000266812 ) . Allotype dissected on six slides ( NIBR IV0000266813 ). Six male paratypes each kept as a whole specimen on separate slides ( NIBR IV0000266814-0000266819 ), three adult males in a vial ( NIBR IV0000266820 ) .

Type locality

South-Korea, Gangwon-Do, Wonju-Si Buron-Myeon Heungho-Ri (37°14′35.0″N, 127°44′54.7″E), 26. October 2012, leg. J.-L. Cho.

Description

Size (mm). Body length: ♂ 1.66 (other males: 1.66, 1.66, 1.65, 1.64, 1.64, 1.62), Ş 1.66, approximately 11 times as long as wide. Head slightly shorter than anteri- or three thoracic segments combined ( Fig. 46A View Fig ). Female differs from male in protopod of thoracopod VI and thoracopod VIII.

Antennule ( Fig. 46B 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. Third segment with two lateral setae including one plumose seta, with two ventrolateral setae, and two dorsal setae and three 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. 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. 46C 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. 46D View Fig ) flat, with six main teeth flanked by two teeth on both lateral sides. Ventral surface convex, with three round median projections without spinules, numerous combs of ctenidia and one pair of teats.

Mandible ( Fig. 46E View Fig ) with incisor process of four teeth. Tooth of ventral edge absent. Spine row consisting of seven spines. Palp of one segment, 2.5 times as long as wide, with one terminal seta and one subterminal seta. Terminal seta two times longer than subterminal seta.

Maxillule ( Fig. 47A View Fig ) two-segmented. Proximal segment with four setae on inner distal margin. Distal segment with two terminal smooth spines and five dentate spines on inner edge, and with three simple setae on outer distal margin. Terminal spine 1.3 times as long as other ones.

Maxilla ( Fig. 47B View Fig ) four-segmented, setal formula 3-4- 10-6.

Thoracopods I-VII ( Figs. 47C, D View Fig , 48A, B View Fig , 49 View Fig A-C, 50A). Thoracopod I-IV increasing in size posteriorly. Thoracopods IV-VII similar in size. Thoracopods III-VII each bearing one epipod on protopod. Basipod with two distal setae in thoracopod I, with one distal seta in thoracopods II-VI, and with each one distal and median seta in thoracopod VII. Number of segments of exopod of thoracopods I-VII: 2-3-4-4-4-4-4. Exopodal segments with each one dorsal and ventral seta, except basal segment lacking dorsal seta in thoracopod II-VII and ventral seta in 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 + 2/1 + 1/4(2)

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

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

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

Thoracopod VIII of male ( Fig. 50B, C View Fig ) 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. Inner margin of penial region (dental lobe) with seven or eight teeth. Epipod flat, with round distal part not reaching lower margin of exopod. Basipod with one small seta near base of endopod, inner margin smooth, distally drawn out into round projection. Basipodal seta as long as endopod. Exopod one third of size of basipod, round, with two distal lobes. Upper lobe with five spinules, lower lobe smooth. Endopod small, round, with two distal setae of different size. Outer seta two times longer than inner one. Thoracopod VIII of female ( Fig. 48C View Fig ) tiny, round in ventral view, with two distal projections.

First pleopod ( Fig. 48D View Fig ) in form of stub bearing two distal setae.

Uropod ( Fig. 51A, C) bearing eight or nine spines of similar size on inner margin of sympod. Endopod 52% 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 three additional spines along inner margin. Terminal spine slightly thicker and stronger than subterminal one. Most distal spine of of inner margin half as large as terminal spine and 1.5 times larger than proximal one. Exopod remarkably shorter than endopod (36% of sympod), with five setae including one basi-ventral seta.

Pleotelson ( Fig. 51A, B) without seta. Anal operculum protruded with triangular tip.

A, B A B C D C, D

Furcal rami ( Fig. 51A, B, D) nearly as long as wide, with two large distal spines, and three smaller spines on inner margin, and with two dorsal plumose setae.