Kimberleybathynella hexapoda, 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 : 2246-2251

publication ID	https://doi.org/ 10.1080/00222930400014148
persistent identifier	https://treatment.plazi.org/id/03DA87DE-FC32-E701-03E4-FA92A3B95EB7
treatment provided by	Felipe
scientific name	Kimberleybathynella hexapoda
status	sp. nov.

Treatment

Kimberleybathynella hexapoda n. sp.

( Figures 17–20 View Figure 17 View Figure 18 View Figure 19 View Figure 20 )

Type material

Holotype: „ dissected on three slides, Weber Plains , East Kimberley, Western Australia, Australia, OIA bore WP6 (15 ° 279530S, 128 ° 509090E), BES 6361, 12 August 1998, S. M. Eberhard leg. coll. Western Australian Museum, Perth ( WAM C 34259) . Allotype: ♀ dissected on five slides, same data as holotype ( WAM C 34260) . Paratypes: 9♀♀, same data as holotype ( WAM 34261–34271 View Materials ) .

Etymology

The species is named after the presence of six pairs of walking legs in adults.

Description of adults

Size (mm). Body length: „ 0.90–1.35, ♀ 1.20–1.45, approximately 12 times as long as wide ( Figure 17 View Figure 17 ). Head as long as length of segments 1–3. The female differs from the male only in thoracopod VIII.

Antennule ( Figure 18A View Figure 18 ). Antennule six-segmented. Setation as in K. mandorana .

Antenna ( Figure 18B View Figure 18 ). Antenna two-segmented, setation as in K. gigantea .

Labrum ( Figure 18C View Figure 18 ). Labrum flat, with three median teeth flanked by six main and two additional teeth on both lateral sides. Median teeth terminally denticulated.

Mandible ( Figure 18D View Figure 18 ). Mandible as in K. gigantea except the incisor process of three teeth.

Maxillule ( Figure 18E View Figure 18 ). Maxillule two-segmented, ornamentation as in K. gigantea except that the three simple setae on outer distal margin of the distal segment exceed the base of the terminal claws.

Maxilla ( Figure 18F View Figure 18 ). Maxilla four-segmented. Second segment half fused with third segment; setal formula 2-4-14-1.

Thoracopods I–VI ( Figures 18I, J View Figure 18 , 19A, B View Figure 19 , 20A, B View Figure 20 ). Thoracopods I–VI increasing in length. Thoracopods IV–VI equal in length. Protopodite of thoracopods II–VI each bearing one epipodite. Thoracopods I–VI each bearing one basipodal seta. Exopodite of thoracopods I– VI one-segmented. Exopodite of thoracopod I with two terminal setae. Exopodite of thoracopods II–VI with two terminal setae and with one seta on inner margin. Endopodite of thoracopods I–VI four-segmented, setal formulae: thoracopods I: 1+0/1+1/1+0/3(1); thoracopods II–VI: 0+0/0+1/0+1/2.

Thoracopod VIII. Thoracopod VIII of male ( Figure 18I, J View Figure 18 ) hemispherical in lateral view. Protopodite massive. Penial region protruded. Epipodite absent. Basipodite without setae, inner margin of basipodite drawn out into projection. Exopodite triangular, bearing three setae. Endopodite as large as exopodite, denticulated terminally. Thoracopod VIII of female ( Figure 18K View Figure 18 ) in form of a conical structure resulting from the complete fusion of left and right thoracopods. The conical structure forked to three sharp ends.

First pleomere. First pleomere with a pair of setae.

Uropod ( Figure 19D, E View Figure 19 ). Uropod bearing six (left) or seven (right) spines on inner distal margin of sympodite. Distal spine 1.5 times as long and thick as proximal spines of equal size. Endopodite 30% as long as sympodite, drawn out distally into slightly curved spur, with two setae at base of spur. Exopodite as long as endopodite, with two terminal setae and one ventromedian seta. Outer one of both terminal setae twice as long as somewhat thicker inner seta.

Pleotelson ( Figure 19C, D View Figure 19 ). Pleotelson with one seta at base of furcal rami on both sides. Anal operculum flat, protruded slightly.

Furcal rami ( Figure 19C, D View Figure 19 ). Furcal rami 1.2 times as long as wide, with four (left) or five (right) spines and with two dorsal plumose setae.