Ochrophyta

Ochrophytes, also known as heterokontophytes or stramenochromes, are a phylum of algae. They are the photosynthetic stramenopiles, a group of eukaryotes, organisms with a cell nucleus, characterized by the presence of two unequal flagella, one of which has tripartite hairs called mastigonemes. In particular, they are characterized by photosynthetic organelles or plastids enclosed by four membranes, with membrane-bound compartments called thylakoids organized in piles of three, chlorophyll a and c as their photosynthetic pigments, and additional pigments such as β-carotene and xanthophylls. Och

The raphidophytes, previously known as chloromonads, are a small but widespread group of single-celled eukaryotic algae, found in both marine and freshwater environments. They are taxonomically known as class Raphidophyceae and order Chattonellales.

thumb|Nannochloropsis sp.

Phaeothamniophyceae is a class of ochrophytes. It contains two orders, Phaeothamniales and Pleurochloridellales, and consists of species separated from Chrysophyceae.

Bolidophyceae is a class of photosynthetic heterokont picophytoplankton, and consist of less than 20 known species. They are distinguished by the angle of flagellar insertion and swimming patterns as well as recent molecular analyses. Bolidophyceae is the sister taxon to the diatoms (Bacillariophyceae). They lack the characteristic theca of the diatoms, and have been proposed as an intermediate group between the diatoms and all other heterokonts.

Chrysophyta or golden algae is a term used to refer to certain heterokonts. thumb|Dinobryon sp. from Shishitsuka Pond, [[Tsuchiura, Ibaraki Prefecture, Japan ]] It can be used to refer to: Chrysophyceae (golden algae), Bacillariophyceae (diatoms), and Xanthophyceae (yellow-green algae) together. E.g., Pascher (1914). Chrysophyceae (golden algae) E.g., Margulis et al. (1990). Chrysophyta has some characteristics which includes their possession of the photosynthetic pigments which are chlorophylls a and c, they also possess a yellow carotenoid called fucoxanthin, this is responsible for their

Dictyotaceae is large family of brown algae (class Phaeophyceae). It is the only family in the monotypic order Dictyotales (). Members of this family generally prefer warmer waters than other brown algae and are prevalent in tropical and subtropical waters thanks to their many chemical defenses to ward off grazers. They display an isomorphic haplodiploid life cycle and are characterized by vegetative growth through a single apical cell. One genus in this family, Padina, is the only calcareous member of the brown algae. Lobophora variegata (= Pocockiella varieagata) often presents a beautiful b

Synchromophyceae is a class of photosynthetic stramenopiles. The chloroplast of the Synchromophyceae are surrounded by two membranes and arranged in a way where they share the outer pair of membranes. The entire chloroplast complex is surrounded by an additional two outer membranes. ==Evolution== Synchromophyceae is a class within the Ochrophyta that contains a few genera of amoeboid organisms, such as the mixotrophic Synchromonas and the heterotrophic Chlamydomyxa and Leucomyxa. It is phylogenetically close to the classes Chrysophyceae and Picophagea, within the SII clade.

Chrysomerophyceae is a proposed monotypic class of photosynthetic heterokont eukaryotes.

Nannochloropsis is a genus of algae comprising six known species. The genus in the current taxonomic classification was first termed by Hibberd (1981). The species have mostly been known from the marine environment but also occur in fresh and brackish water. All of the species are small, nonmotile spheres which do not express any distinct morphological features that can be distinguished by either light or electron microscopy. The characterisation is mostly done by rbcL gene and 18S rRNA sequence analysis.

Phaeothamniales is an order of alga in the Ochrophyta.

Triparma is a genus of unicellular algae in the family Triparmaceae in the order Parmales. They form siliceous plates on the cell surface that aid in identification. Triparma is distinguished by its possession of three shield plates, three triradiate girdle plates, a triradiate girdle plate with notched ends, and a small ventral plate. It was first described by Booth & Marchant in 1987 and the holotype is Triparma columacea.

The Parmales are an order of marine microalgae within the Bolidophyceae class. They are found worldwide and characterized by a cell wall composed of 5-8 interlocking silica plates with distinct forms. They were initially thought to be loricate choanoflagellates but were shown to be a separate phyla entirely upon the discovery of chloroplasts, placing it among the photosynthetic stramenopiles.

Actinosphaerium is a genus of heliozoa, amoeboid unicellular organisms with many axopodial filaments that radiate out of their cell. It is classified within the monotypic family Actinosphaeriidae and suborder Actinosphaerina. Species of Actinosphaerium are distinguished by their large number of nuclei in each cell. Their axopodia sometimes terminate on the surface of nuclei. Vacuoles are abundant in the periphery of the cytoplasm.

REDIRECT Heterosigma akashiwo

REDIRECT Actinophrys

Actinophrys is a genus of heliozoa, amoeboid unicellular organisms with many axopodial filaments that radiate out of their cell. It contains one of the most common heliozoan species, Actinophrys sol. It is classified within the monotypic family Actinophryidae.