Brevisomabathynella clayi, Cho & Humphreys, 2010
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publication ID |
https://doi.org/ 10.1080/00222930903537066 |
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persistent identifier |
https://treatment.plazi.org/id/03D887F9-FFE0-FFE6-FE74-FD0CB3236FE7 |
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treatment provided by |
Carolina |
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scientific name |
Brevisomabathynella clayi |
| status |
sp. nov. |
Brevisomabathynella clayi sp. nov.
( Figures 9–12 View Figure 9 View Figure 10 View Figure 11 View Figure 12 )
Material examined
Holotype (adult female), allotype (adult male), paratype (adult female). Holotype: dissected on six slides ( WAM C 40312) . Allotype: dissected on four slides ( WAM C 40313) . Paratype: as a whole specimen on a slide ( WAM C 40314) .
Type locality
Australia, Western Australia, Carey Palaeodrainage, Millbillillie Station , drainage between Lake Violet and Uramurdah calcretes, MEB site 266 (26°41′15″ S, 120°18′10″ E), BES 10524, 6 June 2004, leg. W.F. Humphreys, C.H.S. Watts and C. Clay. GoogleMaps
Description of adult female (holotype)
Body. Length 3.52 mm. Head as long as anterior three thoracic segments 1–3 combined, approximately 11 times as long as wide ( Figure 9A View Figure 9 ).
Antennule ( Figure 9B View Figure 9 ). Seven-segmented. First segment with one seta on inner margin, with five simple dorsal setae and with one dorsal, one ventromedial and one lateral plumose seta. Second segment with one group of four plumose setae and with four simple setae on inner margin. Third segment with three lateral setae including one plumose seta and six setae on inner 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 setae on inner margin and one dorsal seta. Sixth segment with four setae on inner margin and with dorsal group of two aesthetascs, one simple seta and one additional aesthetasc lateral to simple seta. Seventh segment with three subterminal aesthetascs and four simple setae.
Antenna ( Figure 9C View Figure 9 ). Five-segmented, as long as antennular segments 1–3 combined. Fourth segment as long as fifth segment. Setal formula: 0+0/0+0/1+2/1+1/3(1). Plumose seta of distal segment shorter than longest simple seta.
Labrum ( Figure 9D View Figure 9 ). Flat with 10 median teeth of more or less similar size flanked by six (right) or seven (left) smaller teeth on each side. Ventral surface with numerous combs of ctenidia and 10 teats.
Mandible ( Figure 9E View Figure 9 ). Incisor process of six teeth. Tooth of ventral edge triangular. Spine row consisting of 12 spines. Palp of one segment, with one seta.
Maxillule ( Figure 9F View Figure 9 ). Two-segmented. Proximal segment with four setae on inner margin. Distal segment with two terminal spines, with five spines with denticles on inner edge, and with three simple setae on outer margin.
Maxilla ( Figure 9G View Figure 9 ). Four-segmented, setal formula 4-6-14-11.
Thoracopods I–VII ( Figures 11 View Figure 11 A–D, 12A–C). Thoracopods I–IV increasing in size posteriorly. Thoracopods IV–VII similar in size. Thoracopods I–VII each bearing one epipod on protopod. Basipod of thoracopods I–VII with one seta. Number of exopodal segments of thoracopods I–VII: 4-5-6-7-7-7-7. Endopod of thoracopods I–VII four-segmented, setal formulae:
Th. I 3+1/5+1/2+1/4(2)
Th. II 2+1/4+1/0+1/4(2)
Th. III 2+1/3+1/0+1/4(2)
Th. IV, V 1+1/4+1/0+1/4(2)
Th. VI 1+1/3+1/0+1/4(2)
Th. VII 1+1/1+1/0+1/4(2)
Thoracopod VIII ( Figure 10C View Figure 10 ). Conical, half as long as endopod of male thoracopod VIII.
First pleopod. Absent. Uropod ( Figure 10E,F View Figure 10 ). Sixteen spines of similar size on inner margin of sympod. Exopod 23% as long as sympod, with six setae on outer and terminal margin, without basiventral setae. Endopod 38% 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, one subterminal and three additional spines on inner margin. Terminal spine thicker and 1.5 times as long as subterminal spine. Three innermarginal spines spike-like, two-thirds as long as subterminal spine.
Pleotelson ( Figure 10D,E View Figure 10 ). One seta near base of each furcal ramus on both sides. Anal operculum concave.
Furcal rami ( Figure 10D,E View Figure 10 ). 1.5 times as long as wide, with two large terminal spines, 11 (left) or 10 (right) additional spines on inner margin, and with two dorsal setae.
Description of adult male (allotype)
Body. Length 2.36 mm. Identical to female except for following characters.
Antennule. First segment with four simple dorsal setae. Third segment with five setae on inner margin.
Mandible. Spine row with 10 spines.
Thoracopods I–VII. Number of exopodal segments of thoracopods I–VII: 3-4-5-5-5- 5-4. Setal formulae of endopods:
Th. I 3+1/4+1/1+1/4(2)
Th. II–V 1+1/3+1/0+1/4(2)
Th. VI 1+1/2+1/0+1/4(2)
Th. VII 1+1/1+1/0+1/4(2)
Thoracopod VIII ( Figure 10A,B View Figure 10 ). Rectangular in frontal view, twice as long as wide. Protopod massive, with prominent penial region with terminal opening. Epipod large, triangular, distal part barely reaching penial region of protopod. Basipod without setae, inner margin of basipod drawn out into projection, of which outer margin is equipped with fine hairs. Exopod one-third size of basipod, triangular, terminally with five denticles, bearing two subterminal setae. Endopod half as long as exopod, with two terminal setae.
Uropod. Sympod with 12 spines. Exopod with five setae.
Furcal rami. Both right and left furcal rami with eight spines on inner margin.
Intraspecific variation
Body length of paratype: 3.30 mm. Paratype does not differ from holotype.
Etymology
The specific name refers to one of the collectors (C. Clay: Adelaide, Australia).
| WAM |
Western Australian Museum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.