Allobathynella hongcheonensis, 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 : 76-83

publication ID	https://doi.org/ 10.12651/JSR.2016.5.1.049
persistent identifier	https://treatment.plazi.org/id/039B482E-FFC5-1E3E-FF3B-F8C1FB91FD27
treatment provided by	Felipe
scientific name	Allobathynella hongcheonensis
status	sp. nov.

Treatment

Allobathynella hongcheonensis sp. nov. ( Figs. 24-29 View Fig View Fig View Fig View Fig )

Etymology

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

Material examined

Holotype (adult female), allotype (adult male), paratype (18 adult females and 11 adult males). Holotype dissected on six slides ( NIBR IV0000266858 ) . Allotype dissected on six slides ( NIBR IV0000266859 ). One female paratype ( NIBR IV0000266860 ) dissected on seven slides, one male paratype ( NIBR IV0000266861 ) dissected on six slides, six female paratypes and five male paratypes each as a whole specimen on separate slides ( NIBR IV0000266862-0000266872 ), 11 female and five males paratype in a vial ( NIBR IV0000266873 ) .

Type locality

South-Korea, Ganwon-Do, Hongcheon-Gun, Seo-Myeon, Bangok-Ri (37°41′20.8″N, 127°40′52.6″E), 13. November 2012, leg. J.-L. Cho.

Description

Size (mm). Body length: 1.83 (other females: 1.75- 1.83; allotype: 1.83; other males: 1.70-1.82), approximately 12 times as long as wide. Head slightly shorter than anterior three thoracic segments combined ( Fig. 24A View Fig ).

Antennule ( Fig. 24B 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 two simple setae dorsally and one simple seta ventrally on inner distal margin. Third segment with two lateral setae including one plumose seta, with one ventrolateral seta, and two dorsal 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. 24C 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. 24D View Fig ) flat, medially convex, free margin of eight main teeth flanked by three teeth on both lateral sides. Ventrally with one median projection without spinules, two pairs of teats and numerous combs of epipod ctenidia.

A epipod exopod B exopod endopod A D C D B, C

Mandible ( Fig. 24A View Fig ) with incisor process of four teeth. Tooth of ventral edge absent. Spine row consisting of nine spines. Palp of one segment, three times as long as wide, with one long terminal seta and one subterminal seta. Subterminal seta as long as one third of terminal one.

Maxillule ( Fig. 25A View Fig ) 2-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 spines on inner edge, and with three simple setae on outer distal margin. Terminal spine as long as other ones. Five inner spines dentate.

Maxilla ( Fig. 25B View Fig ) four-segmented, setal formula 3-4- 10-6.

Thoracopods I-VII ( Figs. 25A, B View Fig , 26A, B View Fig , 27A, B View Fig , 28A). 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-V, and with each one distal and median seta in thoracopods VI and VII. Number of segments of exopod of thoracopods I-VII: 3-4-4-5-5-4-4. Exopodal segments with each one dorsal and ventral seta, except basal segment lacking dorsal seta in thoracopods I-VII and second segment lacking dorsal seta in thoracopod V. 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 1 + 1/3 + 2/1 + 1/4(2)

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

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

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

Thoracopod VIII of male ( Fig. 28B, C) 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 with eight or nine teeth. Epipod flat, with round distal part not reaching lower margin of exopod. Basipod with one short seta near base of endopod, inner margin of basipod with numerous teeth and spinules, distally drawn out into round projection, basipodal seta one half as long as endopod. Exopod one third of size of basipod, round, with two distal lobes. Upper lobe with numerous denticles, lower lobe with three spinules. Endopod small, round, with two distal setae of different size. Outer seta 1.5 times longer than inner one.

Thoracopod VIII of female ( Fig. 26C View Fig ) tiny, round in ventral view, with two distal lobes with denticles.

First pleopod ( Fig. 28D) in form of stub bearing two distal setae.

Uropod ( Fig. 29A, D View Fig ) bearing seven spines of similar size 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 three additional spines along inner margin. Terminal spine longer than subterminal one. Three spines of inner margin similar in size, one third as large as terminal spine. Exopod shorter than endopod (42% of sympod), with six setae inclusive of one basi-ventral seta.

Pleotelson ( Fig. 29B, C View Fig ) without seta. Anal operculum slightly convex, nearly flat.

Furcal rami ( Fig. 29B, C View Fig ) 1.3 times as long as wide, with two large distal spines, and three (right) or four (left) successively smaller spines on inner margin, and with two dorsal plumose setae.