LARVAL FORMS OF
ECHINODERMATA
Dr. Rachna Sahay
Assistant Professor, Dept. of Zoology
,INTRODUCTION
Echinoderms are unisexual animal with no
sexual dimorphism.
Fertilization external
Echinoderms are deuterostomes and hence
cleavage is radial, holoblastic and indeterminate.
Development is mostly indirect having larval
stage in between.
, LARVA
The larvae hatch in water, feed and grow through
successive larval stages to become adults.
Larvae of Echinoderms are bilaterally
symmetrical but lose symmetry during
metamorphosis.
Different classes of Echinoderms show
structurally different larval stages.
Comparison of the larval stages of different
classes can reveal their evolutionary ancestry.
ECHINODERMATA
Dr. Rachna Sahay
Assistant Professor, Dept. of Zoology
,INTRODUCTION
Echinoderms are unisexual animal with no
sexual dimorphism.
Fertilization external
Echinoderms are deuterostomes and hence
cleavage is radial, holoblastic and indeterminate.
Development is mostly indirect having larval
stage in between.
, LARVA
The larvae hatch in water, feed and grow through
successive larval stages to become adults.
Larvae of Echinoderms are bilaterally
symmetrical but lose symmetry during
metamorphosis.
Different classes of Echinoderms show
structurally different larval stages.
Comparison of the larval stages of different
classes can reveal their evolutionary ancestry.
