Odontidium hyemale (Roth) Kützing; 1844; 44

Synonymy

Conferva hyemalis Roth 1800

Fragilaria hyemalis (Roth) Lyngbye 1819

Diatoma hyemale (Roth) Heiberg 1863

Neodiatoma hiemale (Lyngbye) Kuntze 1891

Key references

Jüttner I., Williams D.M., Levkov Z., Falasco E., Battegazzore M., Van de Vijver B., Angele C., Ector L. 2015. Reinvestigation of the type material for Odontidium hyemale (Roth) Kützing and related species, with description of four new species in the genus Odontidium (Fragilariaceae, Bacillariophyta). Phytotaxa. 234(1): 1-36.

Morphology

Size
16.1–58.1 µm long, 8.3–11.4 µm wide, length/width ratio 1.9–6.2 (populations from Faroe Islands, Austria, Italy, Jüttner et al. 2015).

Shape
Valves linear-elliptic to elliptic-rhombic, small valves elliptic-rhombic or rhombic, with rounded apices; frustules rectangular in girdle view; valve margins of larger cells more or less parallel, tapering towards apices in the distal quarter of each valve; valve margins in smaller valves tapering from valve centre.

Symmetry
Isopolar, bilaterally symmetrical.

Striae
Striae uniseriate, parallel to slightly radiate towards poles.

Axial area
Sternum relatively narrow and slightly irregular, in some valves extending into apical pore field.

Other features
Transapical ribs nearly all primary, perpendicular or at slight angle to sternum; 3–5 in 10 μm; cingulum composed of many bands; external valve face slightly rippled with or without small spines (spinules), located along valve margin including pore fields, upper part of mantle and near margin on valve face, spines irregularly positioned on virgae protruding in variable directions (SEM); one rimoportula per valve, located near pore field; a simple apical pore field at each pole, composed of round porelli; outer surface of mantle and bands covered with small granules (SEM).

Literature

References are given in chronological order.

Reference	Citation
Lyngbye, H.C. 1819. Tentamen Hydrophytologiae Danicae Continens omnia Hydrophyta Cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, Systematice Disposita, Descripta et iconibus illustrata, Adjectis Simul Speciebus Norvegicis. Hafniae. 248 pp., 70 pls.	Taxonomy; Description; Morphology
Smith W. 1856. A Synopsis of the British Diatomaceae. John van Voorst, London. 107 pp; pls 32-62, pls A-E	Morphology; Illustrations
Grunow A. 1862. Die österreichischen Diatomaceen nebst Anschluss einiger neuen Arten von andern Lokalitäten und einer kritischen Uebersicht der bisher bekannten Gattungen und Arten. Erste Folge. Epithemieae, Meridioneae, Diatomeae, Entopyleae, Surirelleae, Amphipleureae. Zweite Folge. Familie Nitzschieae. 12. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien. 315-472, 545-588 pp; 7 pls.	Morphology; Taxonomy
Heiberg P.A.C. 1863. Conspectus Criticus Diatomacearum Danicarum. Kritisk Oversigt Over De Danske Diatomeer. Wilhelm Priors Forlag, Kjøbenhavn. 135 pp., 6 pls.	Taxonomy; Morphology
Jüttner I., Williams D.M., Levkov Z., Falasco E., Battegazzore M., Van de Vijver B., Angele C., Ector L. 2015. Reinvestigation of the type material for Odontidium hyemale (Roth) Kützing and related species, with description of four new species in the genus Odontidium (Fragilariaceae, Bacillariophyta). Phytotaxa. 234(1): 1-36.	Morphology; Taxonomy; Type Illustration

This page should be cited as:

Jüttner I., Williams D. M. Odontidium hyemale (Roth) Kützing; 1844; 44. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M. 2025 . Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=2639. [Accessed: 4 April 2025].

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Record last modified: 15/08/2021