Planothidium abbreviatum

(Reimer) Potapova 2012      Category: Monoraphid
BASIONYM: Achnanthes lanceolata var. abbreviata Reimer 1966

Plagiotropis lepidoptera var. proboscidea


Planothidium apiculatum

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - November 2011
Length Range: 11-18 µm
Width Range: 6.1-8.5 µm
Striae in 10 µm: 11-12


Valves are elliptic-lanceolate with subrostrate apices. The raphe valve has a transversely rectangular to elliptic central area. The rapheless valve has a wide rhomboid axial area and asymmetric central area that contains a hood on the internal valve surface. The raphe is straight with expanded external proximal ends. The multiseriate striae are radiate on both valves.

Original Description

Basionym: Achnanthes lanceolata var. abbreviata
Author: Reimer 1966
Length Range: 11-26 µm
Width Range: 6-8.5 µm
Striae in 10 µm: 10-12

Original Description

Pseudoraphe valve with shortened striae forming a broad, lanceolate pseudoraphe. Other features as in the nominate variety. Length 11-26 µ. Breadth 6-8.5 µ. Striae 10-12 in 10 µ.

Original Images

Cite This Page:
Potapova, M. (2011). Planothidium abbreviatum. In Diatoms of the United States. Retrieved August 27, 2016, from

Species: Planothidium abbreviatum

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


Potapova, M. (2012). New species and combinations in monoraphid diatoms (Family Achnanthidiaceae) from North America. Diatom Research 27(1): 29-42. doi:10.1080/0269249X.2011.644636

Reimer, C.W. (1966). Consideration of fifteen diatom taxa (Bacillariophyta) from the Savannah River, including seven described as new. Notulae Naturae (Academy of Natural Sciences of Philadelphia) 397:1-15.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion