Frustulia latita

Graeff and Kociolek 2011      Category: Symmetrical biraphid
BASIONYM: Frustulia latita Graeff and Kociolek 2011

REPORTED AS: Frustulia weinholdii (Patrick and Reimer 1966) 

Frustulia krammeri

 

Frustulia neomundana

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Carrie Graeff - October 2011
Length Range: 32.0-48.0 µm
Width Range: 8.0-10.0 µm
Striae in 10 µm: 30-32 at the center, 33-35 at the ends

Description

The valves are linear-lanceolate with slightly rostrate rounded apices. The striae are parallel or slightly radiate at the valve center, parallel along the length of the valve, and convergent at the ends of the valve. Areolae comprising the striae are round or oval. The areolae near the poles are relatively small. Elongated areolae are common at in the transverse depression found at the external raphe ends. At the central area, the striae are variable in length, giving the central a unique and highly asymmetric shape. Internally, the longitudinal ribs terminate well before both the helictoglossae and central nodule.

F. latita is a species that has been separated from the broad taxon concept of F. weinholdii established by Patrick and Reimer (1966) where they described the apices of F. weinholdii as round to capitate. At least two additional species have since been separated from F. weinholdii, including those populations with capitate apices. Under the broad concept of the taxon, reports of F. weinholdii have been numerous in the United States.



Original Description

Basionym: Frustulia latita
Author: Graeff and Kociolek 2011
Length Range: 32.0-48.0 µm
Width Range: 8.0-10.0 µm
Striae in 10 µm: 30-32 at the center, 33-35 at the ends

Original Description

Valves linear-lanceolate with slightly rostrate rounded apices. The striae are parallel or slightly radiate at the valve center, parallel along the length of the valve, and convergent at the ends of the valve. Areolae comprising the striae are round or oval, and the areolae near the poles are relatively small. Elongated areolae are common in the transverse depression found at the external raphe ends. The central area is similar to that seen in F. weinholdii, where it is expanded to accommodate the curved external proximal raphe ends, and a triangular stirae arrangement can be present. Internally, the areolae are occluded. The raphe branches are curved, slightly. Internally, the longitudinal ribs terminate well before both the helictoglossae and central nodule.

The cingulum is comprised of a closed valvocopula with obvious rows of poroids at the apices. In addition, there are a few open girdle bands with one or two rows of poroids. One end of the open girdle band is widened significantly. A break in the valvocopula is sometimes present, revealing an underlying row of poroids and protuberances.

Original Images


Cite This Page:
Graeff, C. (2011). Frustulia latita. In Diatoms of the United States. Retrieved November 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/frustulia_latita

Species: Frustulia latita

Contributor: Carrie Graeff

Reviewer: Sarah Spaulding

Citations

Graeff, C.L. and Kociolek, J.P. (2011). Investigations of the Frustulia weinholdii species complex with descriptions of three new species, F. capitata, F. latita, and F. soror from South Carolina and Hawaii. Proceedings of the Academy of Natural Sciences of Philadelphia 161: 43-59.

Wallace, J. (1960). New and variable diatoms. Notulae Naturae 331: 1-8.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion