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The type species of the genus Ptychocylis is P. urnula described originally by Claparède & Lachmann as Tintinnus urnula in 1858. Lorica dimensions given as averaging 140 µm in length and 100 µm in diameter.
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Dimensions of the most common Ptychocylis species based on the text of the original species descriptions. The length (black arrow) is the middle of the range given in Brandt 1896, Brandt 1906-1907. The grey arrow is the lorica oral diameter based on the total length (not given in the text of the discriptions). Brandt, rather than Claparède & Laachmann, is used for P. urnula because they did not state exactly what 'diameter' was.
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The defiant diatom is probably Biddulphia (according to Anne Thessen) and the tintinnid is Ptychocylis obtusa/urnula. From a sample taken in the Canada Basin in August 2013 by Eun Jin Yang.
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Ptychocylis obtusa from the Chukchi Sea
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Ptychocylis obtusa from the Chukchi Sea
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Ptychocylis obtusa from the Chukchi Sea (Station 18 of the Araon Cruise 003)
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Ptychocylis obtusa from the Chukchi in 2012, Ara003 cruise St 50. This elongated morphotype was about half the population.
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Specimen without teeth or serrations on the lorica oral opening. From the Canada Basin in August 2013, cruise Ara04, St. 13.
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Specimen from the Canada Basin in August 2013, cruise Ara04, Station 15.
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From the Canada Basin in August 2013, St 15 of the ARA04 cruise.
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From the Canada Basin in August 2013, cruise ARA04, St 15
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From Station 13 of the ARA04 cruise to the Canada Basin in August 2013
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Image of a Lugol's fixed specimen collected by Diane Stoecker in July 2009 from the Bering Sea
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Ptychocylis obtusa from the Chukchi Sea (St 22 of the cruise Araon 003)
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1 – 2. Didinium gargantua (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341712) 3. Ptychocylis sp (http://www.marinespecies.org/aphia.php?p=taxdetails&id=196838). 4. Didinium gargantua (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341712) 5. Fusopsis umbracula (http://www.marinespecies.org/aphia.php?p=taxdetails&id=178847) 6. Didinium gargantua (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341712) 7. Cyclotrichium cyclokaryon (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341295) 8. Didinium gargantua (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341712) 9. Uitwerpsel van een kreeftachtige 10 - 11. Didinium gargantua (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341712) 12 – 15. Proboscidium armatum 16. Cyclotrichium cyclokaryon (http://www.marinespecies.org/aphia.php?p=taxdetails&id=341295) 17 – 18. Lacrymaria marina (http://www.marinespecies.org/aphia.php?p=taxdetails&id=179314) 19. Euchelys sp.? 20. Strombidium sp.? 21. Stappersia fusus
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The genus Ptychocylis contains species found in Arctic and Sub-Arctic waters. Data from: Dolan, J.R., Pierce, R.W. 2013. Diversity and Distributions of Tintinnid Ciliates. in Biology and Ecology of Tintinnid Ciliates: Models for Marine Plankton, Dolan, J.R., Agatha, S., Coats, D.W., Montagnes, D.J.S., Stocker, D.K. (eds). Wiley-Blackwell, Oxford, pp 214-243
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The type species of the genus Ptychocylis. Drawing from Claparède, E., Lachmann, J. 1858-1860. Etudes sur les infusoires et les rhizopodes. Mémoires de l'instut Genevois, 5, 6 & 7. - PLate 8, fig. 14. The cell is in the early stage of cell division. 'VC' shows what was thought to be a contractile vacuole. Scale bar drawn from the diameter of 0.1 mm stated in the text (P 209).
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Ptychocylis acuta- Image of a Lugol's fixed specimen collected by Diane Stoecker in July 2009 from the Bering Sea.
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Drawing from Brandt's 1896 description.
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Specimen from the Canada Basin in August 2013. The lorica is slightlly longer than the average.
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Drawing from the original description by Brandt (1896). The black arrow showing length of 120 m is the median of the length range given in the text (pg 59). The grey arrow showing lorica oral diameter of 70 m (not given in the text) is based on the length value.
