Development in the Sea Urchin ‘Psammechinus Miliaris’ (4 Parts)

Synopsis: 4 (1978): Schematic animation and in vivo sequences demonstrate stages in the development of the coelom in the young pluteus and of the sea urchin anlage in the more advanced pluteus until readiness for metamorphosis.
Language: English
Country: Germany
Medium: Video; Videocassette. VHS. col. 11, 10, 11, 12 min.
Year of production: 1982
Availability: Sale; 1996 sale: £25.00 (+VAT +p&p) each
Subjects: Biology
Keywords: sea urchins

Title: Fertilization and cleavage
Synopsis: 1 (1976): Penetration of sperm into the egg; raising the fertilisation membrane; fusion of the pronuclei; cleavage sequence to blastula.
Title: Gastrulation and larval stages
Synopsis: 2 (1976): Ingrowth of primary mesenchymal cells; invagination; outgrowth of secondary mesenchymal cells; coelom formation; production and growth of spicules; various pluteus larval stages.
Title: Metamorphosis
Synopsis: 3 (1982): The 'dissolution' of the larval body is shown with time-lapse photography. The transition from the bilateral symmetry of the pluteus to the star-shaped radial symmetry is explained in an animated sequence. The metemorphosis is induced by the add
Title: Differentiation of the coelom
Synopsis: 4 (1978): Schematic animation and in vivo sequences demonstrate stages in the development of the coelom in the young pluteus and of the sea urchin anlage in the more advanced pluteus until readiness for metamorphosis.

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