Navicula

For other uses, see Navicula (disambiguation).

Navicula is a genus of boat-shaped diatom (single-celled photosynthetic organisms), comprising over 1,200 species,^[1] though many Navicula species likely do not belong in the genus strictly speaking.^[2] Navicula is Latin for "small ship", and also a term in English for a boat-shaped incense-holder.^[2] Navicula is a cosmopolitan genus and species are present in both freshwater and marine environments, typically attached to surfaces (i.e. benthic).

Navicula
Navicula reinhardtii
Scientific classification
Domain:	Eukaryota
Clade:	Diaphoretickes
Clade:	Sar
Clade:	Stramenopiles
Phylum:	Gyrista
Subphylum:	Ochrophytina
Class:	Bacillariophyceae
Order:	Naviculales
Family:	Naviculaceae
Genus:	Navicula Bory de Saint-Vincent, 1822
Type species
Navicula tripunctata
Species
List of Navicula species

Description

Navicula species are pennate diatoms. Their valves are typically elliptical, though some species have more pinched ends than others. Navicula cells have two chloroplasts, one along each side of the valve along the girdle bands.

Mobility

Navicula diatoms are highly motile and move through a gliding movement^[3][4][5] This is done through excretion of extracellular polymeric substances (EPS). One form of EPS surrounds the outside of the cell and another is excreted through a slit in the frustule called a raphe, allowing the cell to glide along a track.^[6]