Surface fine structure of the globiferous pedicellariae of the regular echinoid, Psammechinus miliaris Gmelin.

Abstract:

:The globiferous pedicellariae of Psammechinus miliaris are described. Two fixation methods giving minimal distortion and rapid tissue hardening were adapted for soft tissue preparation for scanning electron microscopy. The pedicellarial valves are covered by a microvillous epithelium. The outer valve epithelial microvilli overlying red spherulocytes in the epidermis are characterized by a filament matrix radiating out from each microvillus. These microvilli may function in epidermal absorption of organic solutes. The inner valve microvilli are more densely packed and the filament matrix is absent. Ciliation is confined to the inner valve surface where the cilia are concentrated to form a distal sensory pad and sensory hillock. Behavioural evidence suggests a chemo- and mechanosensory role for the inner valve surface.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Oldfield SC

doi

10.1007/BF00220184

keywords:

subject

Has Abstract

pub_date

1975-10-13 00:00:00

pages

377-85

issue

3

eissn

0302-766X

issn

1432-0878

journal_volume

162

pub_type

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