Cymbopleura hybrida
(Grunow) Krammer 2003 Category: Asymmetrical biraphid
BASIONYM: Cymbella hybrida Grunow ex Cleve 1894
REPORTED AS: Cymbella hybrida (Patrick and Reimer 1975, p. 32, plate 4, fig. 10) | Cymbella hybrida (Krammer and Lange-Bertalot 1986, p. 337, plate 145, figs 1-3 (not figs 4, 5)
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - August 2012
Length Range: 38-49 µm
Width Range: 10.8-11.9 µm
Striae in 10 µm: 10-13 at the valve center, 15-16 near the apices
Description
Valves are linear-elliptic and slightly dorsiventral, with barely convex dorsal and ventral margins and abruptly constricted rostrate to capitate apices. The axial area is relatively narrow, 2-3 times wider than the raphe. The central area is large and transversely oval or rectangular. The raphe is lateral, becoming filiform near the proximal ends. Proximal raphe ends have small hooks deflected towards the ventral margin. Distal raphe fissures are deflected dorsally. Striae are parallel at the valve center and radiate towards the apices. Areolae are difficult to resolve in LM and number 28-34 in 10 µm.
Original Description
Basionym: Cymbella hybrida
Author: Grunow ex Cleve 1894
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Bahls, L. (2012). Cymbopleura hybrida. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cymbopleura_hybrida
Species: Cymbopleura hybrida
Contributor: Loren Bahls
Reviewer: Sarah Spaulding
Image Credit: Loren Bahls
- Valves linear-elliptic and slightly dorsiventral
- Proximal raphe ends deflected ventrally
- Distal raphe fissures deflected dorsally
- Apices rostrate to capitate
Valves are linear-elliptic and slightly dorsiventral with nearly straight margins. Valve ends are abruptly constricted to form rostrate to subcapitate apices. Proximal raphe ends have ventrally deflected hooks. Distal raphe fissures are deflected dorsally.
Compare
Cymbopleura similis and C. similiformis are smaller than C. hybrida. Encyonopsis descripta and other species of Encyonopsis have dorsally deflected proximal raphe ends and ventrally deflected distal raphe ends.
Cymbopleura similis
(Krasske) Krammer 2003
Cymbopleura similiformis
Krammer 2003
Encyonopsis descripta
(Hustedt) Krammer 1997
Citations
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 190015
Autecology Discussion
Cymbopleura hybrida is uncommon in lakes and ponds of the northern Rocky Mountains, where it prefers cold, oligotrophic, circumneutral waters (pH range: 6.80-7.77) with low to moderate levels of dissolved solids (specific conductance range: 53-250 µS/cm). Patrick & Reimer (1975) report this species from Connecticut, South Carolina, Michigan, and Montana. Krammer (2003) reports Cymbopleura hybrida from arctic, sub-arctic, and alpine regions where it prefers oligotrophic waters with low to moderate electrolyte content.
Images
Lake McDonald, Glacier National Park, Montana: home of Cymbopleura hybrida.
Credit/Source: National Park Service webcam