Oxynaspis joandianeae, Van, Robert J. & Dekelboum, Allen M., 2011
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publication ID |
https://doi.org/ 10.5281/zenodo.279183 |
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DOI |
https://doi.org/10.5281/zenodo.6187602 |
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persistent identifier |
https://treatment.plazi.org/id/03B1CB7F-FFE1-1819-F5F2-FA8015DC8951 |
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treatment provided by |
Plazi |
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scientific name |
Oxynaspis joandianeae |
| status |
sp. nov. |
Oxynaspis joandianeae sp. nov.
Figures 7 View FIGURE 7 , 8 View FIGURE 8
Material examined. Holotype: CASIZ 104150, 1 complete intact specimen, attached to Antipathes sp. ( CASIZ 97824); Pacific Ocean, Caroline Is, Republic of Belau, Ngemelis, steep drop off, Rock Is, 18 m offshore; depth: 15–30 m [Sta. # 22]; 7 August 1974; coll. C. Himmelwright. Paratypes: CASIZ 104151, 5 specimens, attached to Antipathes sp. ( CASIZ 97805); Pacific Ocean, Caroline Is, Republic of Belau, Ngemelis, Rock Is, steep drop off, 91 m offshore; depth: 41 m; 23 July 1974; coll. C. Himmelwright. CASIZ 172661, 1 whole specimen, same locality as CASIZ 104151.SIO-BIC C11212, 2 specimens from CASIZ 104151. CASIZ 104147, 1 specimen, mouthparts and cirri on glass microscope slide, plates on SEM stub, same locality as holotype.
Diagnosis. Bumps or protuberances scattered over exterior of all plates ( Fig. 7 View FIGURE 7 ); carina bent at slightly more than 90° angle at umbo, extending up about one-half length of scutum, basal end flat, not rounded or forked; tergum with occludent margin broadly rounded and slightly inflated at scutal and upper margins to form small protuberances extending slightly beyond margins, spur not truncate; scutum with occludent margin slightly concave above umbo; dorsal filamentary appendage present.
Description. Capitulum with all plates approximate ( Fig. 8 View FIGURE 8 A); capitulum height about twice its width; low growth ridges and small protuberances on all plates; covered with chitinous, golden-brown epicuticle.
Scutum ( Fig. 7 View FIGURE 7 E,F; Fig. 8 View FIGURE 8 A) carinal margin broadly convex, angled, sometimes giving appearance of 2 sides, producing a 5-sided plate; umbo subcentral, near occludent margin; nearly touching carina along entire margin; tergal margin confluent along entire length; occludent and basal margins forming angle of about 90°; basal margin straight or slightly convex; entire occludent margin coincident with mantle margin; occludent margin with small protuberances; adductor muscle pit shallow.
to (E).
Tergum ( Fig. 7 View FIGURE 7 C,D; Fig. 8 View FIGURE 8 A) broadly triangular; margins nearly touching carina and scutum; umbo at apex; scutal margin smooth, shallow concavity on scutal margin (at apex of scutum) near occludent margin; occludent edge slightly convex, slightly curving away from occludent margin; occludent margin with small protuberances.
Carina ( Fig. 7 View FIGURE 7 A,B; Fig. 8 View FIGURE 8 A) curved in upper portion, line from apex to umbo passing outside of carina, similarly line from apex to basal/peduncular margin passing through scutum; umbo in lower one-fifth to one-third; basal margin truncate, not forked, not extending across peduncle; about same length as scutum; width narrowing from basal margin to apex; extending up along about one-half length of tergum; not inflected between basal margin and umbo.
Labrum bullate.
Mandible ( Fig. 8 View FIGURE 8 B) with 3 major teeth along cutting edge, 3 minor teeth at inferior margin of cutting edge, first major tooth longest, second about half length of first, third slightly shorter than second; face of mandible and superior and inferior margins setose.
First maxilla ( Fig. 8 View FIGURE 8 C) with broad, shallow notch on superior half of cutting edge; 2 large spines above notch, several spines along inferior half of notch, many shorter spines below notch; face of maxilla and superior and inferior margins setose.
Cirri I and II ( Fig. 8 View FIGURE 8 D) with anterior ramus shorter than posterior ramus; other cirri with nearly equal or equal number of segments per ramus. Setae simple. Cirral counts are as follows:
CI CII CIII CIV CV CIV Ant. 9 13 13 15 17 15
Post. 11 13 13 15 16 15
Ant. 7 13 14 13 15 16 Post. 10 14 15 16 15 17 Caudal appendages absent. Filamentary appendages absent at base of Cirrus I.
One dorsal filamentary appendage present.
Etymology. Named in honor of Joan Diane Mitchell Dekelboum.
Remarks. Oxynaspis cancellatae Totton, 1940 and O. gracilis Totton, 1940 are the species most similar to O. joandianeae sp. nov., which differs from these two species in the presence of a shallow notch just proximal to the scutal/occludent margin ( Fig.7 View FIGURE 7 C,D). In addition, the carinal umbo position is between the basal one-fifth and basal one-third of the carina in O. joandianae , whereas it is in the basal one-fifth of the carina in O. gracilis and above the basal one-third in the carina of O. cancellatae .
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.