Elattaar, A. A. (2017): Study of Sea urchin Jacksonaster depressum (L. Agassiz, 1841) (Echinodermata, Echinoidea) from the Northern Bay of Safaga, Red Sea coast, Egypt, as an indicator of the change in the Red Sea Environment. Annals of the Geological Survey of Egypt, Vol. 34 no. ISSN 1110-0435.
One hundred and seventy seven living and dead complete tests of Jacksonaster depressum (L. Agassiz) were collected from different depths ranging between 10 and 52 meters depth from the Northern Bay of Safaga, Red Sea coast. Morphometric measurements were conducted on some specific characters of the skeletons in addition to use the scanning electron microscope in the study on spines, ... Read more