Kimberleybathynella gigantea, Cho & Park & Humphreys, 2005

Cho, Joo-Lae, Park, Jong-Geun & Humphreys, W. F., 2005, A new genus and six new species of the Parabathynellidae (Bathynellacea, Syncarida) from the Kimberley region, Western Australia, Journal of Natural History 39 (24), pp. 2225-2255 : 2227-2232

publication ID	https://doi.org/ 10.1080/00222930400014148
persistent identifier	https://treatment.plazi.org/id/03DA87DE-FC21-E714-03DF-FA58A0D95BDB
treatment provided by	Felipe
scientific name	Kimberleybathynella gigantea
status	sp. nov.

Treatment

Kimberleybathynella gigantea n. sp.

( Figures 2–5 View Figure 2 View Figure 3 View Figure 4 View Figure 5 )

Type material

Holotype: „ dissected on six slides, Weber Plains , East Kimberley, Western Australia, Australia, OIA bore WP1 (15 ° 299190S, 128 ° 509090E), BES 6362, 13 August 1998, S. M. Eberhard leg. coll. Western Australian Museum, Perth ( WAM C 34240) . Allotype: ♀

dissected on five slides, same data as for holotype ( WAM 34241). Paratypes : 1 „ and 4♀♀, same data as for holotype ( WAM 34242–34246 About WAM ) .

Etymology

The species is named after the large body size.

Description of adults

Size (mm). Body length: „ 3.49–3.91, ♀ 3.00–3.22, approximately 10 times as long as wide. Head as long as length of segments 1–4 ( Figure 2 View Figure 2 ). The female differs from the male only in thoracopod VIII.

Antennule ( Figure 3A View Figure 3 ). Antennule six-segmented. First segment with one seta on inner distal margin, with two simple dorsal setae, and with one dorsolateral, one lateral and one ventromedial plumose setae. Second segment with one group of four plumose setae, one simple seta on inner distal margin and one ventral seta. Third segment with two setae on outer margin, one simple seta on inner distal margin and one ventral seta. Peduncle of third segment with three simple setae. Fourth segment with one stub seta and a plumose seta on dorsal margin, with two stub setae, and with two plumose setae on lateral apophysis. Fifth segment with two setae on inner margin, with two aesthetascs and one simple seta dorsally, and with one lateral aesthetasc. Sixth segment with four terminal setae and three subterminal aesthetascs.

Antenna ( Figure 3B View Figure 3 ). Antenna two-segmented, as long as the first segment of the antennule, proximal segment without setae, distal segment with two simple setae and one plumose seta terminally and one subterminal seta.

Labrum ( Figure 3C View Figure 3 ). Labrum flat, with four terminally denticulated median teeth flanked by eight to nine main and six to seven additional teeth on both sides.

Mandible ( Figure 3D View Figure 3 ). Mandible with incisor process of four teeth. Tooth of ventral edge small and triangular. Spine row consisting of five spines. Palp of one segment, with one apical seta being seven times as long as palp.

Maxillule ( Figure 3E View Figure 3 ). Maxillule two-segmented. Proximal segment with four setae on inner distal margin. Distal segment with two terminal claws, with three claws on inner edge, and with three simple setae on outer distal margin. The three simple setae barely reaching beyond the base of the terminal claws.

Maxilla ( Figure 3F View Figure 3 ). Maxilla four-segmented. Second segment half fused with third segment; setal formula 2-4-15-1.

Thoracopods I–VII ( Figures 3G–I View Figure 3 , 4I View Figure 4 , 5A–C View Figure 5 ). Thoracopods I–VII increasing in length posteriorly. Thoracopods IV–VII equal in length. Protopodite of thoracopods II–VII each bearing one epipodite. Thoracopods I–VII each bearing one basipodal seta. Exopodite of thoracopods I–VII one-segmented. Exopodite of thoracopods I, V, VI, VII with two terminal setae and with two setae on inner margin. Exopodite of thoracopods II–IV with two terminal setae and with three setae on inner margin. Endopodite of thoracopods I–VII four-segmented, setal formulae: thoracopods I: 1+0/2,3+1/2+0/3(1); thoracopods II: 0+0/ 2+1/1+1/2; thoracopods III: 0+0/1,2+1/0+1/2; thoracopods IV: 0+0/2+1/1+1/2; thoracopods V–VII: 0+0/1+1/0+1/2.

Thoracopod VIII. Thoracopod VIII of male ( Figure 3J View Figure 3 ) hemispherical in lateral view. Protopodite massive, with two hooks on inner margin. Penial region slightly protruded. Epipodite represented by a tiny hemisphere. Basipodite without seta, inner margin of basipodite drawn out into projection. Exopodite triangular, bearing one seta. Endopodite 50% of exopodite, denticulated terminally. Thoracopod VIII of female ( Figure 3K View Figure 3 ) in form of a bifurcated structure resulting from the basal fusion of left and right thoracopods. Distal end of each branch bifurcated.

First pleomere. First pleomere with a pair of two setae.

Uropod ( Figure 4D, F–H View Figure 4 ). Uropod bearing 20 spines on inner distal margin of sympodite. Distal spine twice as long as proximal spines of equal size. Endopodite 30% as long as sympodite, drawn out distally into slightly curved spur, with two setae of equal length at base of spur and further two subterminal setae on outer margin. Exopodite as long as endopodite, with two terminal and three lateral setae and one ventromedian seta. Outer member of both terminal setae 1.5 times as long as the marginally thicker inner seta.

Pleotelson ( Figure 4A View Figure 4 ). Pleotelson with one seta at base of furcal rami on both sides. Anal operculum flat, somewhat concave.

Furcal rami ( Figure 4B, C View Figure 4 ). Furcal rami 1.5 times as long as wide, with six spines and with two dorsal plumose setae.