Allobathynella shinjongieei, Park & Cho, 2008

Park, Jong-Geun & Cho, Joo-Lae, 2008, A preliminary inquiry into an Asian topsy-turvy Dom, Allobathynella with the description of a new species from South Korea and redescription of A. japonica (Crustacea, Syncarida, Parabathynellidae), Journal of Natural History 42 (3 - 4), pp. 223-238 : 229-235

publication ID	https://doi.org/ 10.1080/00222930701850018
persistent identifier	https://treatment.plazi.org/id/03DB87BA-FFFD-6002-FE6B-16E1FC17B488
treatment provided by	Felipe
scientific name	Allobathynella shinjongieei
status	sp. nov.

Treatment

Allobathynella shinjongieei sp. nov.

( Figures 5–8 View Figure 5 View Figure 6 View Figure 7 View Figure 8 )

Etymology. The species is named after Mr Jong-Iee Shin (K-Water, South-Korea), who encouraged the preparation of this study.

Type material

Holotype: adult male dissected on six slides, South-Korea, Kyungsangnamdo, Geochang (35 ° 439130N, 127 ° 559340E), 3 October 2003, leg. J.-L. Cho and S. Berghoff. coll. ( NIBR IV0000100002 View Materials ) . Allotype: adult female dissected on five slides, same data as holotype ( NIBR IV0000100003 View Materials ) . Paratypes: five males and two females each kept as a whole specimen on a slide, two male and one female each dissected on six slides, same data as holotype ( NIBR IV0000100004 View Materials ) .

Diagnosis

Parabathynellid of small size (1.53 mm). Antennule seven-segmented, with a median seta on the inner margin of fifth segment. Antenna seven-segmented with a setal formula of 0+0/0+0/1+0/1+1/1+0/1+2/5(1). Mandibular palp with two setae. Exopods of thoracopods I–VII multi-segmented. Thoracopods IV – VII each with an epipod. Pleopod I stalk-formed, with two setae. Uropodal sympod with ten spines of similar size. Uropodal endopod with five spines. Uropodal exopod wih six setae inclusive of a basi-ventral seta. Furcal ramus with six spines. Anal operculum convex.

Description of adults

Size (mm). Body length of holotype: 1.53; other males: 1.46 – 1.53, Body length of allotype: females: 1.57; other females: 1.49 – 1.57. Approximately 12 times as long as wide. Head as long as anterior three thoracic segments combined ( Figure 5 View Figure 5 ). The female differs from the male in thoracopod VIII.

Antennule ( Figure 6A View Figure 6 ). Seven-segmented. First segment with one seta on inner distal margin, with two simple dorsal setae and with one dorsal, one ventromedial and two lateral plumose setae. Second segment with one group of four plumose setae and with four simple setae on inner distal margin. Third segment with three lateral setae including one plumose seta and four setae on inner distal margin. Inner flagellum of third segment with three simple setae. Fourth segment with one stub seta and one plumose seta on dorsal margin, and with two stub setae and two plumose setae on outer distal apophysis. Fifth segment with four simple distal setae and one median seta on inner margin, two aesthestascs and one dorsal seta. Sixth segment with four setae on inner margin, two aesthetascs and one seta dorsally and with one more aesthetasc. Seventh segment with three subterminal aesthetascs and four simple setae.

Antenna ( Figure 6B View Figure 6 ). Seven-segmented, as long as the length of antennular segments 1–6. Setal formula: 0+0/0+0/1+0/1+1/1+0/1+2/5(1). Second segment with a row of ctenidia.

Labrum ( Figure 6C View Figure 6 ). Flat, with 14 teeth in total. Eight median teeth flanked by three lateral teeth on both sides.

Mandible ( Figure 6D View Figure 6 ). Mandible 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 two apical seta.

Maxillule ( Figure 6E View Figure 6 ). Two-segmented. Proximal segment with four setae on inner distal margin. Distal segment with two terminal spines and five spines on inner edge, and with three simple setae on outer distal margin.

Maxilla ( Figure 6F View Figure 6 ). Four-segmented, setal formula 3-5-10-6.

Thoracopods I–VII ( Figures 6G–H View Figure 6 , 7A–C View Figure 7 , 8A–B View Figure 8 ). Thoracopods I–IV increasing in size posteriorly. Thoracopods IV–VII similar in size. Thoracopods IV–VII each bearing one epipod on the protopod. Basipod of thoracopod I with two distal setae. Basipod of thoracopods II, III and VII with one distal seta. Basipod of thoracopods IV–VI with one distal and one median seta. The number of segments of the exopod of the thoracopods I–VII: 3-4-4-5-5-5-5. Each segment of exopods rich in ctenidia. The endopod of thoracopods I – VII 4-segmented, setal formulae:

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

Thoracopods II–IV: 1+1/2+2/0+1/4(2)

Thoracopods V–VII: 1+1/1+2/0+1/4(2)

Male thoracopod VIII ( Figures 8C–D View Figure 8 ). Perpendicular to body, in form of a bell in lateral view, 1.5 times longer than wide. Protopod with a prominent penial region bearing a distal opening. Inner margin of penial region without teeth. Epipod flat, round, its distal part barely reaching the bottom of exopod. Basipod with one tiny seta, inner margin of basipod drawn out into projection. Exopod one third of the size of the basipod, round, serrated distally. Endopod small, round, with two distal setae of different size.

Female thoracopod VIII ( Figures 8E–F View Figure 8 ). Tiny, round in ventral view, with two projections.

First pleopod ( Figure 7D View Figure 7 ). In form of stub bearing two distal setae.

Uropod ( Figures 7E–F View Figure 7 ). Bearing 10 spines of similar size on inner margin of sympod. Endopod 53% 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 distal spine, one subterminal spine and three further spines on inner margin. Distal spine slightly thicker and stronger than subterminal one. The most distal spine of the three inner-marginal spines 50% as large as the distal one and three times as large as two proximal spines. Exopod slightly shorter than endopod (46% of sympod), with six setae inclusive of one basi-ventral seta.

Pleotelson ( Figures 7F–G View Figure 7 ). Without setae. Anal operculum slightly convex.

Furcal rami ( Figures 7F–G View Figure 7 ). 1.5 times as long as wide, with two large distal spines, and four smaller spines on inner margin, and with two dorsal setae.