Caloneis amphisbaena

(Bory) Cleve 1894      Category: Symmetrical biraphid
BASIONYM: Navicula amphisbaena Bory 1824

Brebissonia lanceolata


Caloneis bacillum

LM scalebar = 10 µm = 40 pixels.


Contributor: Jaime Zebill Haueter - June 2014
Length Range: 59-77 µm
Width Range: 21.3-26.4 µm
Striae in 10 µm: 15-17


Valves are elliptical to elliptical lanceolate, with capitate apices. The axial area is broad and expanded to form a large lanceolate rhombic central area. The central area is slightly asymmetric from one side of the axial area to the other. The raphe is straight and centrally located. Proximal raphe ends are slightly expanded. Distal raphe ends are curved in the same direction. Striae radiate throughout most of the valve, becoming parallel to convergent at the ends. Two longitudinal lines are present along each side of the raphe, dividing the striae approximately into thirds.

Note that Patrick and Reimer (1966) report a greater range in length (36-80 µm) and breadth (20-30 µm).

Original Description

Basionym: Navicula amphisbaena
Author: Bory 1824
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Haueter, J. (2014). Caloneis amphisbaena. In Diatoms of the United States. Retrieved August 24, 2016, from

Species: Caloneis amphisbaena

Contributor: Jaime Zebill Haueter

Reviewer: Sarah Spaulding


Cleve, P.T. (1894). Synopsis of the Naviculoid Diatoms, Part I. Kongliga Svenska-Vetenskaps Akademiens Handlingar 26(2):1-194, 5 pls.

Lamouroux, J.V.F., Bory de Saint-Vincent, J.B. & Eudes-Deslongchamps, J.A. (1824). Encyclopédie méthodique. In *Histoire naturelle des zoophytes ou animaux Rayonnés*. pp. i-viii, 1-819. Paris: Veuve Agasse.

Mann, D.G. (1989). The species concept in diatoms: evidence for morphologically distinct, sympatric gamodemes in four epipelic species. Plant Systematics and Evolution 164: 215-237.

Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Caloneis amphisbaena CAS

NCBI Genbank Taxonomy

Caloneis amphisbaena NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 12023

Autecology Discussion

Caloneis amphisbaena was found in epipelon samples from the Little Sioux River, Dickinson County, Iowa. Other specimens were found in epiphytic samples from Dugout Creek, Dickinson County, Iowa.

Mann (1989) stated that Caloneis amphisbaena in Blackford Pond appeared to be asexual, as no cells were observed to pair and form auxospores.


Caloneis amphisbaena live cell in valve view and girdle view.

Credit/Source: Jaime Haueter

Caloneis amphisbaena live cell in valve view showing chloroplast structure.

Credit/Source: Jaime Haueter

Caloneis amphisbaena live cell in valve view showing chloroplast structure.

Credit/Source: Jaime Haueter

Sampling Caloneis amphisbaena from epipelon of Little Sioux River, Dickinson County IA

Credit/Source: Viviana Mazzei