Oxinasphaera furcata, Schotte & Kensley, 2005
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publication ID |
https://doi.org/ 10.1080/00222930400005757 |
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persistent identifier |
https://treatment.plazi.org/id/C07587D6-FF8C-E048-FE44-F7CAFD8E7A18 |
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treatment provided by |
Felipe |
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scientific name |
Oxinasphaera furcata |
| status |
sp. nov. |
Oxinasphaera furcata View in CoL sp. nov.
( Figures 31 View Figure 31 , 32 View Figure 32 )
Material examined
Holotype: USNM 280353 About USNM , one male (5.7 mm), IIOE sta 463, off Somalia, 11 ° 249N, 51 ° 359E, 75–175 m, 17 December 1964 . Paratypes: USNM 280354 About USNM , two immature males, one ovigerous female, two females, three juveniles, same data as holotype . USNM 280355 About USNM , one male , IIOE sta 445, off Somalia, 9 ° 419N, 51 ° 039E, 60–70 m, 16 December 1964 . USNM 280356 About USNM , two males , IIOE sta 447, off Somalia, 10 ° 009N, 51 ° 159E, 9–61 m, 16 December 1964 .
Description
Male. Body length slightly less than twice as long as wide. Cephalon faintly tuberculate on anterior margin with prominent bifurcate spike on rostrum. Pereonite 1 unornamented. Pereonites 2 and 3 each with two rows of very low, indistinct tubercles. Pereonites 4–6 each with two rows of low rounded spikes, spikes in anterior rows larger. Pereonite 7 with anterior row of larger, conical spikes and many fewer, smaller tubercles in posterior row. Pleon very granulose with scattered setae, having two relatively short projections on posterior margin, not reaching mid-length of pleotelson; posterolateral margin of pleon produced into spike. Pleotelson very granulose with scattered setae, having pair of short protuberances ventral to each pleonal projection, posterior protuberance larger; posterior margin with produced, rounded medial lobe overlying telsonic excision, equal in length to lobes on either side.
Antennule peduncle article 1 with five regular anterior spikes, single proximoventral spike, and posterior blade; flagellum of seven to eight articles, single asethetasc each on distal five articles. Antennal peduncle articles 3–5 with long setae; flagellum of about 11 articles. Epistome bearing triangular, chisel-like blade with medial notch on posterior margin. Maxilliped as figured; other mouthparts also typical of genus.
Pereopod 1 with several stiff, fringed setae on posterior margin of propodus and two on carpus. Pereopod 2 with single fringed and three simple setae at distal margin of carpus. Pereopod 7 with long stiff setae on posterior margin of propodus, carpus and merus; several long setae and two complex tridentate setae on distal margin of carpus.
Penes length about 12 times width, tapering to acute apex; spinulose on distal onefourth.
Pleopod 1 with three coupling hooks; medial margin of endopod with groove. Pleopod 2, appendix masculina bulging somewhat at mid-length before tapering to narrowly rounded apex extending by one-sixth of length beyond posterior margin of endopod. Uropodal exopod about one-third length of endopod; endopodal apex with single, strong dorsally curved spine and three ventral tubercles, distalmost largest.
Ovigerous female. Dorsum smooth, unornamented, with broadly rounded pleotelsonic apex; not distinguishable from other females in genus. Brood pouch typical of genus.
Color. Chromatophores apparently lacking.
Remarks
The forked epistomal blade and pattern of antennular spikes (five regular anterior and one proximoventral) separate the new species from all other western Indian Ocean species. See comments under ‘‘Remarks’’ for O. brucei .
Etymology
The specific name furcata , from the Latin for ‘‘forked’’, refers to the shape of the epistome, a diagnostic characteristic of the species.
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