11-2 LAB Slides Echinodermata

Starfish Larva Brachiolaria















Starfish Young















Starfish Development

Make sure you can identify the different stages of development on the slide. The unfertilized egg has a nucleus. Fertilized egg is like a solid ball. In this picture, fertilized would be slightly below the center and to the right. Blastula looks like a tennis ball. A perfect blastula can be seen at a little past 3 o'clock (in this picture). Gastrula is when you start to see an indentation. There are a few gastrulas in this picture. Also, make sure to know the parts of the gastrula. These can be found in your hand out.















Leptosynapta Skin
(skin of sea cucumber- Class Holothuroidea)















Asterias (Starfish) Pedicellariae (for protection)















Starfish Ray