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Red Algae

Red Algae

Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...

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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...

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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

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Related Experiment Video

Updated: Mar 22, 2026

Generation and Long-term Maintenance of Nerve-free Hydra

Generation and Long-term Maintenance of Nerve-free Hydra

Published on: July 7, 2017

STRUCTURE AND REPRODUCTION OF THE ALGAL SYMBIONTS OF HYDRA VIRIDIS(1).

¹Department of Biology, University of Pittsburgh, Pittsburgh, Pennsylvania.

Journal of Phycology

|April 12, 2016

Summary

Algal symbionts within Hydra viridis exhibit cell walls and reproduce like free-living Chlorella. Their unique cell wall remnants persist in host vacuoles, even during starvation.

Area of Science:

Symbiotic biology
Cell biology
Invertebrate zoology

Background:

Algal symbionts reside in the gastrodermal digestive cells of Hydra viridis.
Understanding the symbiont's reproductive cycle and interaction with the host is crucial.

Purpose of the Study:

To investigate the ultrastructure and reproductive cycle of algal symbionts in Hydra viridis.
To examine the fate of algal cell walls within the host environment.

Main Methods:

Utilized electron microscopy to observe the algal symbionts.
Analyzed the reproductive processes and cell wall formation/degradation.

Main Results:

Symbionts possess cell walls and reproduce via autospore formation, similar to free-living Chlorella.

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Last Updated: Mar 22, 2026

Generation and Long-term Maintenance of Nerve-free Hydra

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Published on: July 7, 2017

Generation of Transgenic Hydra by Embryo Microinjection

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Establishment of a Clonal Culture of Unicellular Conjugating Algae

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Parental cell walls rupture, releasing autospores, and remnants form persistent, scroll-like structures in host vacuoles.

Symbiont structure and carbohydrate storage remain unaffected by long-term host starvation.

Conclusions:

The reproductive cycle of algal symbionts in Hydra viridis is well-defined, involving autospore release and cell wall rupture.
Persistent, unique cell wall remnants are a notable feature of this symbiosis.
The symbiosis is robust, with symbionts maintaining integrity and function even under nutrient deprivation.