Allobathynella coreana Morimoto, 1970

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 : 50-57

publication ID	https://doi.org/ 10.12651/JSR.2016.5.1.049
persistent identifier	https://treatment.plazi.org/id/039B482E-FFDF-1E14-FF3B-F921FF18FC47
treatment provided by	Felipe
scientific name	Allobathynella coreana Morimoto, 1970
status

Treatment

Allobathynella coreana Morimoto, 1970 ( Fig. 1-6)

Material examined

One adult male dissected on seven slides ( NIBRIV 0000266821 ) , one adult male dissected on six slides ( NIBR IV0000266823 ) , two adult female dissected on six slides ( NIBR IV0000266822 , 0000266824 View Materials ) , eight adult males ( NIBR IV0000266825-0000266832 ) and four adult females ( NIBR IV0000266833-0000266836 ) each as total specimen on a slide and five adult males as total specimen in a vial ( NIBRIV 0000266837 ) . All specimen from South-Korea, Gangwon-Do, Yeongwol- Gun Yeongwol-Eup Bangjeol-Ri (37°10′30.1″N, 128°26′ 27.2″E), 27. October 2012, leg. J.-L. Cho. GoogleMaps

Description

Size (mm). Body length: ♂ 2.01 (average of other males: 2.00, n = 9), Ş 2.00, approximately 11 times as long as wide. Head slightly shorter than anterior three thoracic segments combined ( Fig. 1A). Female differs from male in protopod of thoracopod VI and thoracopod VIII .

Antennule ( Fig. 1B) 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 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 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. 1C) 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. 1D) flat, with eight main teeth flanked by three teeth on both lateral sides. Ventral surface concave, with one tiny round median projections bearing three distal spinules beneath free margin, three pairs of teat and numerous combs of ctenidia.

Mandible ( Fig. 1E) with incisor process of four teeth. Tooth of ventral edge absent. Spine row consisting of nine spines. Palp of one segment, 2.5 times as long as wide, with one apical seta being basally barbed.

Maxillule ( Fig. 2A) two-segmented. Proximal segment with four setae on inner distal margin and with setules. Distal segment with two terminal smooth spines and six dentate spines on inner edge, and with three simple setae on outer distal margin.

Maxilla ( Fig. 2B) four-segmented, setal formula 3-5- 12-6.

Thoracopods I-VII ( Figs. 2 C-E, 3A, B, 4A, 5A, B). Thoracopod I-IV increasing in size posteriorly. Thora-

February 2016 PARK AND CHO-FOURTEEN SPECIES OF ALLOBATHYNELLA 51 52 JOURNAL OF SPECIES RESEARCH Vol. 5, No. 1

A A 0.5 mm D B C E B, C D, E

B A D E A, B C C-E

copods 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 and III, and with each one distal and median seta in thoracopods IV-VII. Number of segments of exopod of thoracopods I-VII: 3-4-5-6-6-6-6. Exopodal segments with each one dorsal and ventral seta, except basal segment lacking dorsal seta in thoracopods IV, VI and 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 2 + 1/4 + 2/0 + 1/4(2)

Thoracopods III, IV 1 + 1/3 + 2/0 + 1/4(2)

Thoracopods V, VI 1 + 1/2 + 2/0 + 1/4(2)

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

Thoracopod VIII of male ( Fig. 5C, D 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 six or seven teeth. Epipod flat, with flat round distal part not reaching lower margin of exopod. Basipod with one seta near base of endopod, inner margin of basipod with a row of denticles, 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 tiny denticles. Endopod small, round, with two distal setae of different size. Outer seta three times longer than inner one. Thoracopod VIII ( Fig. 3C View Fig ) of female tiny, round in ventral view, with two or three sharp distal projections.

B A-C C A D D

First pleopod ( Fig. 4B View Fig ) in form of stub bearing two distal setae.

Uropod ( Fig. 6A) bearing 12 spines on inner margin of sympod, two most distal spines somewhat longer than others of similar length. Endopod 60% 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 five additional spines along inner margin. Subterminal spine slightly shorter than terminal spine, Most distal spine of inner-margin two thirds as large as terminal spine and 2.5 times larger than proximal ones of similar size. Exopod remarkably shorter than endopod (40% of sympod), with six setae including one basi-ventral seta.

Pleotelson ( Fig. 6 B-D) without seta. Anal operculum protruded slightly with sharp tip.

Furcal rami ( Fig. 6 B-D) 1.2 times as long as wide, with two large distal spines, and four successively smaller spines on inner margin, and with two dorsal plumose setae.