No abstract

Crinoidea is the class of marine animals composed of crinoids, which comprises the feather-stars or sea-lilies. Vast arrays of living and extinct species are found in shallow water to great depths in this most primitive of living classes of Echinodermata (Pandian, 2018). Many species of stalked crinoids live in deep seas and a few are sessile, which are exhibited on rocky beaches. There are a variety of colors, from the most vibrant animals to the pale or colorless. Only the genus Comanthus A.H.Clark, 1908 is found in Pakistani waters. Presently we described the taxonomy of shallow-water Comanthus wahlbergii (Müller, 1843) that were collected from Jiwani (Pakistan) (25°03'06''N 61°44'35''E).

No abstract

The present paper is based on the study of gastric mill of four species of penaeid prawn belonging to genus Parapenaeopsis. A careful examination of gastric mill with particular emphasis on the position and structure of plates and ossicles has revealed that each ossicle is specific and shape may also afford important generic characters.