Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Embryonic stages and developmental abnormalities of the sea urchin Paracentrotus lividus observed in this study after 48 h of incubation under controlled conditions of temperature and light: (A) normal larva at pluteus stage; (B) gastrula stage; (C) prism larvae; (D) separated tip; (E,F) crossed tip; (F,G) fused arms; (G) general abnormal larvae; (H,I) abnormal arms orientation; (J) deformed arms; (K) arms absence; and (K,L) asymmetric arms.
