If you need an accessible version of this item please contact JSTOR User Support

Silurian Calymenid Trilobite Alcymene n. gen., with New Species from the Ludlow of Gotland, Sweden

Lars Ramsköld, Jonathan M. Adrain, Gregory D. Edgecombe and Derek J. Siveter
Journal of Paleontology
Vol. 68, No. 3 (May, 1994), pp. 556-569
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/1306203
Page Count: 14
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
Silurian Calymenid Trilobite Alcymene n. gen., with New Species from the Ludlow of Gotland, Sweden
Preview not available

Abstract

Alcymene n. gen. comprises a monophyletic group of calymenids known from the Ludlow Series of Sweden and the British Isles. The sister species Alcymene alveus and A. lindstroemi n. gen. and spp. (Hemse Beds, Gotland, Sweden) are most closely related to the type species A. neointermedia (Richter and Richter), which occurs in overlying and underlying strata at nearby localities. Structural modification of A. alveus and A. lindstroemi, especially the development of a greatly broadened and troughed librigenal border, can be interpreted as "snowshoe" adaptations for increased stability on an offshore mud substrate.

Page Thumbnails

  • Thumbnail: Page 
556
    556
  • Thumbnail: Page 
557
    557
  • Thumbnail: Page 
558
    558
  • Thumbnail: Page 
559
    559
  • Thumbnail: Page 
560
    560
  • Thumbnail: Page 
561
    561
  • Thumbnail: Page 
562
    562
  • Thumbnail: Page 
563
    563
  • Thumbnail: Page 
564
    564
  • Thumbnail: Page 
565
    565
  • Thumbnail: Page 
566
    566
  • Thumbnail: Page 
567
    567
  • Thumbnail: Page 
568
    568
  • Thumbnail: Page 
569
    569