Krammer 1997 Category: Asymmetrical biraphid
TYPE SPECIES: Encyonopsis cesatii Krammer
Sorted by maximum length (smallest to largest)
Valves are naviculoid and slightly dorsiventral, symmetric to the transapical axis and asymmetric to the apical axis. The raphe is centrally located. Areolae in the striae are round or oblong and oriented with their long axes parallel to the transapical axis. Transapical striae are radiate near the valve center and radiate or parallel near the apices. Proximal raphe ends are deflected toward the dorsal margin. Distal raphe fissures are deflected ventrally. Stigmata and apical pore fields are absent.
Encyonopsis is distinguished from Kurtkrammeria by the orientation of the striae at the valve apices, by the shape and orientation of the areolae, and by other features observed in SEM. In Encyonopsis species, areolae are round or elongate in a transapical direction. In Kurtkrammeria, areolae are slit-like or crescent shaped with the long axis oriented apically. In Encyonopsis, the terminal striae are radiate or parallel; in Kurtkrammeria, terminal striae are convergent. Stigmata and apical pore fields may be present in Kurtkrammeria, but they are absent in Encyonopsis.
Cite This Page:
Bahls, L. (2015). Encyonopsis. In Diatoms of the United States. Retrieved February 05, 2016, from http://westerndiatoms.colorado.edu/taxa/genus/Encyonopsis
Contributor: Loren Bahls - December 2015
The concept of the genus Encyonopsis was changed to become more narrow as of this date. The genus Kurtkrammeria was recognized and established as a new genus. Formerly, Encyonopsis included the broader definition.