Development of Herdmania has been described by Sebastian (1953) and Das (1957). Development is indirect involving a free swimming tadpole larva. Herdmania (a tunicate) is the most appropriate one of the best examples of retrogressive metamorphosis in which the highly developed tadpole larva undergoes retrogressive changes to become the most degenerated and sedentary adult. The phenomenon of retrogressive metamorphosis is [...]
In this article we will discuss about:- 1. Geographical Distribution 2. Habits and Habitat 3. Affinities and Systematic Position of Herdmania. Subphylum Urochordata (Gr., uros = tail; chorde = cord) includes a peculiar group of widely distributed marine animals called sea squirts or ascidians and their allies. In most of them several chordate characters are lost in the adults, but [...]
In this article we will discuss about the external morphology of herdmania with help of suitable diagrams. Shape, Size and Colouration: The body of Herdmania pallida is roughly oblong in outline, narrower at its attached than at its free end. At its free end, it is provided with two external openings—the branchial and atrial apertures. The average size of the [...]