WoRMS taxon details
Akelbaster novaecaledoniae Mah, 2007
| ||Checked by Taxonomic Editor|
|Typetaxon of|| ||
Akelbaster Mah, 2007|
|Parent|| ||Akelbaster Mah, 2007|
original description: Mah, C. (2007). Systematics, phylogeny and historical biogeography of the Pentagonaster clade (Asteroidea: Valvatida: Goniasteridae). Invertebrate Systematics 21: 311-339. [details]|
|Environment|| ||marine, |brackish, fresh, terrestrial
|Fossil range|| ||recent only|
|Distribution|| ||New Caledonia [details]|
|Link|| ||To Encyclopedia of Life|
Description: Body thick, pentagonal (R/r= ~1.1-1.5). Marginal plates form distinct dorsal-facing border. Marginal plate periphery represents ~30% of R. |
Abactinal plates bare, polygonal to rounded. Most plates polygonal, larger proximally becoming more rounded, smaller adjacent to superomarginals. Primary circlet plates flat becoming rugose, uneven in larger specimens (R=~2.0 cm). Radial, interradial, and non-circlet disk plates with mound-like convexities round to oblong in shape. Plates with concavities absent from primary circlet region in smaller specimens (R=~1.0 cm) but larger specimens (R=~2.0 cm) with concavities present. Carinal plates with prominent concavity, becoming nearly tubercular, at center of plate, which becomes less pronounced relative to concavities on interradial and radial plates in larger (R=2.0 cm) specimens. Angular granules 20-65, evenly distributed, quadrate to elongate in shape. Granules at plate corners angular, approximately twice as large as other granules, forming triangle with granules from other corners. Radial regions swollen, interradial regions depressed. Pedicellariae enlarged, the size of an abactinal plate, in each interradius, sitting in pits on enlarged interradial plates. Pedicellariae blades flattened, edges smooth.
Madreporite triangular becoming more polygonal-rounded in smaller specimens. Papulae occur completely over abactinal surface.
Marginal plates bare, smooth, swollen, convex in cross-section. Granules 60-75, quadrate in shape, edges rounded, evenly spaced. Dissimilar number of superomarginals to inferomarginals, interradially. Larger specimens (R= 1.5-2.0 cm) with three superomarginals, seven inferomarginals. Superomarginal-inferomarginal series offset except for the middle superomarginal that corresponds to the middle inferomarginal plate. Superomarginal plates larger than inferomarginal plates. Smaller specimens (R=0.9 cm) with three superomarginals, five inferomarginals. Superomarginal plates adjacent to terminal largest, elongate. Central superomarginal between distalmost plates with equivocal length and width. Inferomarginal plates similar in size. Inferomarginal series upturned distally, plates adjacent to terminal smallest in series. All marginal plates with enlarged pedicellariae 1-2, perpendicular to contact between disk, marginal plate boundary. Pedicellariae identical to those on disk surface, occupies approximately 50% of distance between plate edge and disk.
Two prominent intermarginal openings present on adjacent sides to the middle superomarginal-inferomarginal plate pairs. Intermarginal openings formed by the gap present between intersection of four marginal plates composed of two superomarginal and two inferomarginal plates. Intermarginal pits between middle plates largest with most prominent papillae-like covering (Figs. 3C, E, F). More distal intermarginal openings smaller with fewer papillar-like structures. A channel is present between marginal plates running below the rows of papillar granules. Intermarginal show apparent connection with fasciolar channel from between marginal plate series. Smaller openings occur between the adjacent superomarginal-inferomarginal offset pairings. Pits absent distally. Intermarginal openings covered with flattened, scalar, papillae-like granules, which are largest around periphery becoming smaller and more spinelet-like deeper in the opening. Papillar granules flattened and scalar around intermarginal pit periphery becoming more spinelet-like deeper in the opening. Under SEM (Fig. 3E, F) papillae granules show fine surface texture covered with fine thorny spinelets in dried specimens. Papillar granules occur in ordered rows perpendicular to the cleft between adjacent marginal plates (Fig. 3E). Terminal plate enlarged, triangular with blunt, prominent spine.
Actinal plates convex, quadrate to polygonal becoming more irregular in series adjacent to inferomarginal series. Actinal chevrons 3-4. Each actinal plate [details]
Akelbaster MNHN specimen
added on 2008-10-22 - author: Mah, Christopher
qualitystatus: checked by Mah, Christopher on 2008-10-22 06:38:53
Akelbaster MNHN specimen-oral surface
added on 2008-10-22 - author: Mah, Christopher
qualitystatus: checked by Mah, Christopher on 2008-10-22 06:39:26
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| || ||Citation: Mah, C. (2013). Akelbaster novaecaledoniae Mah, 2007. In: Mah, C.L. (2013) World Asteroidea database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=254783 on 2013-05-22|
| || || The webpage text is licensed under a Creative Commons Attribution 3.0 License||