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Mastogloia pumila

(Grunow) Cleve 1895      Category: Symmetrical biraphid
BASIONYM: Mastogloia braunii var. pumila Grunow in Van Heurck 1880

Mastogloia pseudosmithii


Melosira dickiei

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - January 2012
Length Range: 18-50 µm
Width Range: 7.0-10.2 µm
Striae in 10 µm: 24-28


Valves are linear-lanceolate to elliptic-lanceolate with subtly protracted and broadly rounded apices. Long but narrow lyrate lateral sterna occupy the center of the valve. The axial area is very narrow and barely wider than the raphe. The central area connecting lateral sterna is transverse and rectangular. Partecta near the middle of the valve are considerably larger than those closer to the apices. The raphe is weakly lateral with slightly enlarged proximal ends that extend a short distance into the central area. Raphe branches are straight (not sinuous) and bordered on each side by short sections of striae consisting of one or two adjacent areolae. Striae consist of single rows of areolae, are parallel in the middle of the valve, and become radiate towards the apices. Areolae are indistinct in LM and number 26-30 in 10 µm.

Original Description

Basionym: Mastogloia braunii var. pumila
Author: Grunow in Van Heurck 1880
Length Range: about 30 µm
Striae in 10 µm: 23-24

Original Description

M. braunii var. pumila Grun.! (Atl. Pl. 4 fig. 23). Petit, gréle, à espaces hyalins à double courbure; stries 23 à 24 en 1 c.d.m. Longueur environ 3 c.d.m. Non encore trouvé.

Original Images

Cite This Page:
Bahls, L. (2012). Mastogloia pumila. In Diatoms of the United States. Retrieved May 22, 2018, from

Species: Mastogloia pumila

Contributor: Loren Bahls

Reviewer: Marina Potapova


Cleve, P.T. (1895). Synopsis of the Naviculoid Diatoms, Part II. Kongliga Svenska-Vetenskaps Akademiens Handlingar 27(3):1-219.

Hustedt, F. (1959). Die Kieselalgen Deutschlands, Osterreichs und der Schweiz, 2. Teil. In: Kryptogamen-Flora von Deutschlands, Osterreichs und der Schweiz, (Dr. L. Rabenhorst, ed.), Band VII(2). Reprint 1977, Otto Koeltz Science Publishers, Koenigstein, 845 pp.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

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.

Van Heurck, H. (1880). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers.

Witkowski, A., Lange-Bertalot, H. and Metzeltin, D. (2000). Diatom Flora of Marine Coasts I. Iconographia Diatomologica 7: 1-925.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Mastogloia pumila CAS

North American Diatom Ecological Database (NADED)

NADED ID: 43007

Autecology Discussion

Mastogloia pumila has been reported from estuaries and bays along the Atlantic coast and the Gulf of Mexico (Patrick & Reimer 1966). Inland, this taxon was found in Salt Creek and Stockade Beaver Creek below Salt Creek in northeast Wyoming near Newcastle. Salt Creek is fed from salt springs and has a specific conductance of 45700 µS/cm and a chloride concentration of 13200 mg/L. Specific conductance in Stockade Beaver Creek is 18100 µS/cm and chloride measures 5060 mg/L. In Europe, Krammer & Lange-Bertalot (1986) report Mastogloia pumila from sediments along sea coasts and from inland waters in coastal areas.


Stockade Beaver Creek below Salt Creek, Weston County, Wyoming: home of Mastogloia pumila.

Credit/Source: Photo courtesy Wyoming DEQ