What are the characteristics of Pinnularia?
Pinnularia are elongated elliptical unicellular organisms. Their cell walls are composed chiefly of pectic substances on a rigid silica framework. Their walls are composed of two halves called thecae (or less formally, valves.) These halves overlap like a Petri dish and its cover.
Is Pinnularia a diatom?
Abstract. Pinnularia is an ecologically important and species-rich genus of freshwater diatoms (Bacillariophyceae) showing considerable variation in frustule morphology.
What is the scientific name of Pinnularia?
PinnulariaPinnularia / Scientific name
What is the class of Pinnularia?
BacillariophyceaePinnularia / Class
Where is Pinnularia found?
It occurs on all continents, and even on the most remote island of the planet (Bouvetøya; about 1700 km north of Continental Antarctica). Pinnularia borealis species are survivors: they are well-adapted to desiccation and extreme freezing events (Souffreau et al. 2013).
What is Pinnularia raphe?
The raphe is wedge shaped in transverse section. It has circular thickening called central nodules in the centre. Similar thickening also present at the outer ends of raphe. These are called polar nodules. These nodules open to the external aqueous medium.
How do navicula move?
Biraphid diatoms move by excreting extracellular polymeric substances (EPS) from the raphe slit present in each of the silica cell walls (valves) that make up the cell. Cyanobacterial filaments move by gliding and nonflagellated euglenids move by amoeboid movement.
Is Pinnularia a protist?
2019. Extensive cryptic diversity in the terrestrial diatom Pinnularia borealis (Bacillariophyceae). Protist. 170:121–40.
How auxospore are formed in Pinnularia?
Its protoplast metamorphosed into gamete. The gametes are liberated from the parent frustules. They fuse to form zygote. The zygote enlarges and form auxospore.
Where can Navicula be found?
Habitat: Navicula species are common in both freshwater and marine habitats.
Is navicula a parasite?
Navicula is a genus of boat-shaped diatom algae, comprising over 1,200 species. Navicula is Latin for “small ship”, and also a term in English for a boat-shaped incense-holder….
| Navicula | |
|---|---|
| Phylum: | Ochrophyta |
| Class: | Bacillariophyceae |
| Order: | Naviculales |
| Family: | Naviculaceae |
Where is Navicula found?
Navicula spp.
| Classification | |
|---|---|
| Distribution | |
| Habitat | Close Benthic, sometimes found in Close plankton |
| Geographic | Close Cosmopolitan |
| Seasonal | Present throughout the year, but more abundant in spring and fall |