Brevisomabathynella cooperi, Cho, Joo-Lae, Park, Jong-Geun & Reddy, Y. Ranga, 2006

Cho, Joo-Lae, Park, Jong-Geun & Reddy, Y. Ranga, 2006, Brevisomabathynella gen. nov. with two new species from Western Australia (Bathynellacea, Syncarida): the first definitive evidence of predation in Parabathynellidae, Zootaxa 1247, pp. 25-42 : 27-29

publication ID	https://doi.org/ 10.5281/zenodo.172945
DOI	https://doi.org/10.5281/zenodo.6255679
persistent identifier	https://treatment.plazi.org/id/526E87B0-FFDE-0D75-FEB6-FDA4FB22DD76
treatment provided by	Plazi
scientific name	Brevisomabathynella cooperi
status	sp. nov.

Treatment

Brevisomabathynella cooperi sp. nov.

( Figs 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 )

Etymology

The species is named for Dr. S.J.B. Cooper.

Type material

Holotype: male, dissected on five slides. Australia, Western Australia, Gascoyne, Jundee Station, JSP 1 South Hill Well Borefield, Jundee Mine (26°16'58"S, 120°40'33"E), BES 6578, 11 May 2001 (W.F. Humphreys, C.H.S. Watts and S.J.B. Cooper) ( WAM C 36684). Allotype: female, dissected on five slides, same data as of holotype ( WAM C 36685). Paratypes: 6 males and 5 females, each as a whole specimen on a slide, same data as of holotype ( WAM C 36686 36696).

Other material. 2 males and 2 females from BES 6575 (26°17’46”S, 120° 40’13”E) ( WAM C 36697), 1 female from BES 6580 (26°16’58”S, 120°40’14”E) ( WAM C 36698), 1 female from BES 6584 (26°16’58”S, 120°40’14”E) ( WAM C 36699), 1 male from BES 6587 (26°17’14”S, 120°40’16”E) ( WAM C 36700), 1 male and 3 females from BES 6588 (26°16’08”S, 120° 40’51”E) ( WAM C 36701), 1 female from BES 6591 (26°16’22”S, 120° 40’55”E) ( WAM C 36702), 2 females from BES 6595 (26°16’58”S, 120°40’56”E) ( WAM C 36703), 1 female from BES 6599 (26°17’14”S, 120° 40’16”E) ( WAM C 36704), 2 males and 2 females from BES 6602 (26°16’08”S, 120° 40’51”E) ( WAM C 36705).

Description of male (holotype)

Body thick, length 1.72 mm (other males: 1.65–1.80 mm), approximately 4.5 times as long as wide. Head as long as anterior five thoracic segments combined ( Figs 1 View FIGURE 1 A, B).

Antennule ( Figs 2 View FIGURE 2 A, B) consisting of seven slender segments and 40% longer than head. First segment with one tiny 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 at distal outer corner and with three simple setae on inner distal margin. Third segment with three lateral setae including one plumose seta, and two 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 three simple setae. Sixth segment with two setae on inner margin, and three aesthetascs and one seta dorsally. Seventh segment with three subterminal aesthetascs and four simple setae.

Antenna ( Figs 2 View FIGURE 2 C) fivesegmented, as long as antennular segments 1–4 combined. Setal formula: 0+0/0+0/1+1/1+1/3(1). Plumose seta of the fifth segment longer than terminal simple seta.

Labrum ( Fig 2 View FIGURE 2 D) flat and huge, longer than wide, free margin somewhat vaulted and with 26 narrow teeth of more or less similar size, flanked by three or four teeth, gradually decreasing in size on both sides. Inner surface with two pairs of teats and without ctenidia.

Mandible ( Fig 2 View FIGURE 2 E) with incisor process of seven teeth. Tooth of ventral edge triangular. Spine row consisting of eight spines, most proximal spine with hairs. Palp of one segment, with one apical seta reaching beyond the pars incisiva

Maxillule ( Fig 2 View FIGURE 2 F) twosegmented. Proximal segment with four clawlike spines on distoinner margin. Distal segment with two terminal spines, with four spines and one tiny spine on inner edge, and with three simple, unequal setae on distoouter margin. Terminal spines shorter than the two most distal ones of inner edge. The most ventral seta on outer distal margin of distal segment reaching the middle of terminal claw.

Maxilla ( Fig 2 View FIGURE 2 G) foursegmented, setal formula: 3596.

Thoracopods I–IV ( Figs 3 View FIGURE 3 A, B, 4 A, B) increasing in length posteriorly. Thoracopods IV–VI ( Figs 4 View FIGURE 4 B, C, D) similar in length. Thoracopod VII ( Fig 4 View FIGURE 4 E) as long as thoracopod I. Thoracopods I–VII each bearing one epipod on protopod and one inner seta on basipod. E xopod longer than endopod on thoracopods II–VI; both rami almost equal in length on thoracopods I and VII. Number of exopodal segments of thoracopods I–VII: 466666 4. Endopod of thoracopods I–VII 4 segmented, setal formulae:

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

Thoracopod II, III 1 +1/2+1/0+1/4(2)

Thoracopod IV – VI 1 +1/1+1/0+1/4(2)

Thoracopod VII 1 +1/1+1/0+1/3(1)

Thoracopod VIII ( Figs 3 View FIGURE 3 C, D) more or less rectangular in lateral view, 1.5 times longer than wide. Protopod massive, with prominent penial region with a distal opening. Inner margin of the distal opening with tiny denticles. Epipod large, triangular, its distal part barely reaching distal opening of penial region. Basipod without setae, inner margin of basipod drawn out into projection. Exopod onethird the size of basipod, triangular, bearing two subterminal setae, and with serrated outer margin. Endopod smaller than exopod and with two distal setae.

First pleopod absent.

Uropod ( Figs 3 View FIGURE 3 F, G): sympod slender, six times as long as wide, bearing 15 spines of similar size on inner margin. Endopod 40% as long as sympod, with two dorsal plumose setae in the proximal half, with two terminal setae and one subterminal plumose seta on outer margin and with five spines on inner margin, distal two spines thicker and longer. E xopod slightly longer than endopod, with four outer and two terminal setae.

Pleotelson ( Figs 3 View FIGURE 3 F, G) with one short seta on either side at base of furcal ramus. Anal operculum concave.

Furcal rami ( Figs 3 View FIGURE 3 F, G) twice as long as wide, with two large distal spines, and five (right) or six (left) smaller spines on inner margin, and with two dorsal setae.