Sponge releasing sperm

Sponge releasing sperm

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Caption: Sponge releasing sperm. Unidentified sponge (phylum Porifera) releasing sperm (white) into the water. These male sex cells (spermatozoa) will be taken into the tissues of nearby sponges, and carried to the eggs. After fertilisation, the developing embryos, known as blastulas, are released into the water. Sponge larvae either settle directly and grow into the adult form, or they may form part of the plankton before settling. Sponges are primitive animals whose bodies contain no muscle or nerve cells. They are supported by a mineral skeleton embedded in a gelatinous matrix. Photographed off the coast of Brunei.

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Keywords: animal, borneo, brunei, cell, cells, gamete, gametes, invertebrate, invertebrates, male, marine, nature, ocean, porifera, poriferan, release, releasing, reproducing, sea, sessile, sex, sexual reproduction, sperm, spermatozoa, sponge, stationary, underwater, wildlife, zoology

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