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Haptonema

Haptonema are unique organelles found within the haptophytes, a group of algae similar to the heterokonts (for instance, golden algae) but with a different cell structure. It is possible that chloroplasts evolved from the haptophytes because of certain similarities in structure (homology) between the two organelles.

Haptophytes have dual flagella that are slightly unequal, between which is coiled the haptonema. The haptonema organelle is structurally similar to flagella, but it differs considerably in its arrangement of microtubules and in the way it is used; it has six to seven single microtubules and, though its function is not yet fully understood, it seems to be important in attachment and in the ingestion of nutrients. The name of haptonema comes from the Greek hapsis – nema, or touch-thread.

The most important haptophytes are coccolithophores, which form microfossils from their calcite scales, called coccoliths. Two types of haptophytes form a toxic marine algal bloom.

Web Resources On Haptonema

Haptophyta PowerPoint Presentation
Phylum Haptomonada

Book Resources On Haptonema

The Haptophyte Algae by Green & Leadbeater
Coccolithophores by Winter & Siesser

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