Allobathynella cheongdoensis, 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 : 122-128

publication ID	https://doi.org/ 10.12651/JSR.2016.5.1.049
persistent identifier	https://treatment.plazi.org/id/039B482E-FF97-1E53-FF3B-FC0DFEE1F97A
treatment provided by	Felipe
scientific name	Allobathynella cheongdoensis
status	sp. nov.

Treatment

Allobathynella cheongdoensis sp. nov. ( Figs. 63-67 View Fig View Fig View Fig View Fig View Fig )

Etymology

The species name is derived from the county (Cheongdo-Gun), where the material was collected.

Material examined

Holotype (adult female), allotype (adult male), paratype (five adult females, five adult males and three instars). Holotype dissected on seven slides ( NIBR IV0000267064 ) . Allotype dissected on eight slides ( NIBRIV 0000267065 ). One female paratype dissected on eight slides ( NIBR IV0000267066 ), one male paratype dissected on seven slides ( NIBR IV0000267067 ), four female paratypes and four male paratypes each as a whole specimen on separate slides ( NIBR IV0000267068- 0000267075 ), three instars together as total specimen in a slide ( NIBRIV0000267076 ) .

Type locality

South Korea, Kyungsangbuk-Do, Cheongdo-Gun , Maejeon-Myeon, Geumgok-Ri, Dongchang stream (Riv- er Nakdong tributary) (35°40′28.0″N, 128°52′03.1″E), 12. March 2013, leg. J.-G. Park. GoogleMaps

Description

Size (mm). Body length: Ş 2.15 (other females: 2.00- 2.15), ♂: 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. 63A View Fig ). Male differs from female in protopod of thoracopod VI and thoracopod VIII.

Antennule ( Fig. 63B 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 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. 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. 63C 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 + 1/5(1).

Labrum ( Fig. 63D View Fig ) flat, with eight main teeth flanked by three (left) or five (right) teeth on both lateral sides. Ventral surface concave, with shield-shaped chitin plate, with one round median projection bearing two spinules and one pair of teats and with numerous combs of ctenidia on concave surface.

Mandible ( Fig. 63E View Fig ) with incisor process of four teeth. Tooth of ventral edge absent. Spine row consisting of eight spines. Palp of two segments, proximal segment as long as wide, distal segment two times as long as wide, with one long terminal seta and one short subterminal seta. Terminal seta four times longer than subterminal seta.

Maxillule ( Fig. 64A View Fig ) two-segmented. Proximal segment with four setae on inner distal margin. Distal segment with two terminal smooth spines, with four smooth spines on inner edge, and with three simple setae on outer distal margin. Terminal spine 1.5 times as long as other ones.

Maxilla ( Fig. 64B View Fig ) four-segmented, setal formula 3-4- 10-6.

Thoracopods I-VII ( Figs. 64 View Fig C-E, 65A-C, 66A). 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-IV, with each one distal and median seta in thoracopods V-VII. Number of segments of the exopod of the thoracopods I-VII: 3-4-5-5-6-5-5. Exopodal segments with each one dorsal and ventral seta, except basal segment lacking dorsal seta in thoracopods III, IV, VI, VII and lacking dorsal and ventral setae in thoracopod V. basipod 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 2 + 1/2 + 2/1 + 1/4(2)

Thoracopod II 1 + 1/3 + 2/0 + 1/4(2)

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

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

Thoracopod VIII of male ( Fig. 66 View Fig E-G) 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 nine teeth. Epipod flat, with round distal part not reaching lower margin of exopod. Basipod with two small setae of different length near base of endopod, inner margin with spinules, distally drawn out into round projection. Long basipodal seta as long as endopod, two times as long as shorter one. Exopod one third of size of basipod, round, with two distal lobes. Upper lobe with three spinules, lower lobe with five dentils. Endopod small, round, with two distal setae of different size. Outer seta three times longer than inner one. Thoracopod VIII of female ( Fig. 66B, C View Fig ) conical in ventral view, with two spine-like distal projections.

First pleopod ( Fig. 66B, D View Fig ) in form of stub bearing two distal setae.

Uropod ( Fig. 67A, B View Fig ) bearing ten spines on inner margin of sympod, most distal spine significantly larger than other ones of similar size. Endopod 49% 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 four 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 fourth as large as distal one. Exopod shorter than endopod (39% of sympod), with six setae inclusive of one basi-ventral seta.

Pleotelson ( Fig. 67A, C View Fig ) without seta. Anal operculum slightly convex, nearly flat.

Furcal rami ( Fig. 67A, C, D View Fig ) 1.3 times as long as wide, with two large distal spines, and four successively smaller spines on inner margin, and with two dorsal plumose setae.