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Any of various photosynthetic, unicellular marine algae of the division Haptophyta or Prymnesiophyta, possessing two flagella and often bearing external calcified scales that fossilize as coccoliths. Haptophytes are abundant in the world's oceans and are thought to play an important role in global carbon and sulfur cycles.

[From New Latin Haptophyta, division name : Greek haptein, to grasp, touch (from the threadlike structure characteristic of the haptophytes, used to capture food and as a sensory organ ) + Greek phyton, plant; see -phyte.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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The larvae were fed a diet of the haptophyte Isochrysis galbana at cell densities of 30,000 cells [mL-.sup.1].
Toxic and harmful phytoplankton composition and seasonal cell density: A total of 20 potentially toxic and harmful phytoplankton taxa were identified during the study period (Table 1) which consists of one cyanobacterium, one diatom, one haptophyte and 15 dinoflagellates belonging to the following divisions: (17) Dinophyta, (1) Bacillariophyta, (1) Cyanophyta and (1) Haptophyta.
V Wolfe, "Production and cellular localization of neutral long-chain lipids in the haptophyte algae Isochrysis galbana and Emiliania huxleyi," Journal of Phycology, vol.
Dinoflagellates, cercozoa, eustigmatophytes, and haptophyte algae responded most dramatically to the gradual increase in salinity after the latest marine reconnection and during the warm and moist mid-Holocene climatic optimum.
Gene expression profiling of coccolith-bearing cells and naked cells in haptophyte Pleurochrysis haptonemofera with a cDNA macroarray system.
The most common autotrophic nanoflagellates include the haptophyte Phaeocystis pouchettii (and probably some other species of the same genus), which shows a colonial phase with immobile cells and another phase with solitary flagellated cells.
This trend is supported by studies run with the chlorophytes Dunaliella salina (Lamers et al., 2012) and Chlorella zofingiensis (Mulders et al., 2014) and with the haptophyte Isochrysis galbana (Roopnarain et al., 2014), among many others.
Parallel work showed this diversity was dominated by organisms in the classes Chrysophyceae and Prymnesiophyceae, the Prasinophyceae, and a possible new clade of the Haptophyte phylum (Lepere et al., 2009; Shi et al., 2009, 2011).
Once hatched, the veligers were fed the unicellular haptophyte alga Isochrysis galbana daily and cultures were transferred to new afASW + CAM twice weekly.