Brevisomabathynella eberhardi, 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-FFDF-FFC5-FE19-FAA6B35B6FE5 |
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treatment provided by |
Carolina |
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scientific name |
Brevisomabathynella eberhardi |
| status |
sp. nov. |
Brevisomabathynella eberhardi sp. nov.
( Figures 26–29 View Figure 26 View Figure 27 View Figure 28 View Figure 29 )
Material examined
Holotype (adult male), allotype (adult female), paratypes (each one adult male and female). Holotype: dissected on seven slides ( WAM C 40290) . Allotype: dissected on four slides ( WAM C 40291) . Paratypes: one adult male and one adult female each as a whole specimen on a slide ( WAM C 40292–C 40293) .
Type locality
Australia, Western Australia, Paroo station, GSWA Bore #20(A) (26°20′44″ S, 119°35′22″ E), BES 6063, 6 June 1998, leg. S.M. Eberhard. GoogleMaps
Description of adult male (holotype)
Body. Length 1.82 mm ( Figure 26A View Figure 26 ). Head as long as anterior three thoracic segments 1–3 combined, approximately 10 times as long as wide.
Antennule ( Figure 26B View Figure 26 ). Seven-segmented. First segment with one seta on inner margin, with three 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 five simple setae on inner margin. Third segment with three lateral setae including one plumose seta and four 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 four 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 26C View Figure 26 ). Five-segmented, as long as antennular segments 1–3 combined. Fourth segment slightly shorter than fifth segment. Setal formula: 0+0/0+0/ 1+1/1+1/3(1). Plumose seta of distal segment as long as longest simple seta.
Labrum ( Figure 26D View Figure 26 ). Flat with 10 median teeth of more or less similar size flanked by four smaller teeth on each side. Ventral surface with numerous combs of ctenidia and three teats.
Mandible ( Figure 26E View Figure 26 ). Incisor process of five teeth. Tooth of ventral edge triangular. Spine row consisting of nine spines. Palp of one segment, with one apical seta.
Maxillule ( Figure 26F View Figure 26 ). 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 26G View Figure 26 ). Four-segmented, setal formula 3,4-4-11-9.
Thoracopods I–VII ( Figures 28 View Figure 28 A–D, 29A–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: 4-5-5-6-6-5-5. Endopod of thoracopods I– VII four-segmented, setal formulae:
Th. I 3+1/3+1/1+1/4(2)
Th. II 1+1/2+2/0+1/4(2)
Th. III 1+1/3+2/0+1/4(2)
Th. IV, V 1+1/2+2/0+1/4(2)
Th. VI 1+1/1+2/0+1/4(2)
Th. VII 1+1/1+1/0+1/4(2) Thoracopod VIII ( Figure 27 View Figure 27 A–C). Rectangular in frontal view, twice as long as wide. Protopod massive, with prominent penial region with terminal opening. Epipod large, triangular, distal part reaching terminal region of basipod. Basipod without setae, inner margin of basipod drawn out into projection. Exopod one-third size of basipod, triangular, bearing four terminal teeth and two subterminal setae. Endopod as long as exopod, with two terminal setae.
First pleopod ( Figure 26J View Figure 26 ). In form of two stubs adjacent to each other. Each stub bearing two terminal setae.
Uropod ( Figure 27D,F View Figure 27 ). Ten spines on inner margin of sympod. Exopod as long as endopod, with six setae on outer and terminal margin, without basiventral setae. Endopod 45% as long as sympod, with two dorsal plumose seta near base, with two terminal setae and one subterminal plumose seta on outer margin, and with one terminal, one subterminal and two additional spines on inner margin. Terminal spine somewhat longer and thicker than subterminal spine. Two inner-marginal spine tiny, tooth-like.
Pleotelson ( Figure 27D,E View Figure 27 ). One seta near base of each furcal ramus on both sides. Anal operculum concave.
Furcal rami ( Figure 27D,E View Figure 27 ). Twice as long as wide, with two large terminal spines, seven (left) or eight (right) additional spines on inner margin, and with two dorsal setae.
Description of adult female (allotype)
Body. Length 1.75 mm. Identical to male except for following characters.
Antennule. Second segment with four setae on inner margin. Third segment with five setae on inner margin.
Thoracopods I–VII. Number of exopodal segments of thoracopods I–VII: 5-5-6-6-6- 5-5. Setal formulae of endopods:
Th. I 3+1/3+1/1+1/4(2)
Th. II – V 1+1/3+2/0+1/4(2)
Th. VI, VII 1+1/2+2/0+1/4(2)
Thoracopod VIII ( Figure 26I View Figure 26 ). Conical, half as long as endopod of male thoracopod VIII, with one terminal tooth.
Furcal rami. Both right and left furcal rami with seven spines on inner margin.
Intraspecific variation
Body length of paratypes: male 1.77 mm; female 1.67 mm. Variation in number of setae, spines or segments of extremities as listed in Table 6.
Etymology
The specific name refers to one of the collectors, Dr S.M. Eberhard (Perth, 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.