NARMS image

Atelostomata (apical system)
Atelostomata (apical system)
Description The two extant orders differ in the plate scheme of the apical system: Left: Holasteroida: The arrangement is elongated, the ocular plates OII and OIV toch each other and separate the anterior (G2/G3) and the posterior (G4/G1) genital plates. The ocular plates OI and OV form the posterior end (Corystus relictus; modified after Mooi & David 1996). Right: Spatangida: The apical system is more compact, the enlarged genital plate G2 (madreporite) expands to the posterior, separating G1 and G4 and the ocular plates O I and O V (Brissus; after Mortensen 1951).
Scale 2 mm.
Author Schultz, Heinke JPG file - 138.41 kB - 2 332 x 1 032 pixels added on 2009-02-232 764 viewsWoRMS taxaScan of drawing Spatangoidachecked Kroh, Andreas 2021-02-24Scan of drawing Brissus Gray, 1825checked Kroh, Andreas 2021-02-24Scan of drawing Atelostomatachecked Kroh, Andreas 2021-02-24Scan of drawing Holasteroidachecked Kroh, Andreas 2021-02-24Scan of drawing Corystus relictus (de Meijere, 1902)checked Kroh, Andreas 2021-02-24From reference Schultz, H. (2009). Sea urchins II: Worldwide irregular d... Download full sizeDownload full size © 2009 Schultz, Heinke
Comment Comment (0)
[Add comment]

Disclaimer: WoRMS does not exercise any editorial control over the information displayed here. However, if you come across any misidentifications, spelling mistakes or low quality pictures, your comments would be very much appreciated. You can reach us by emailing, we will correct the information or remove the image from the website when necessary or in case of doubt.