publications (16)
- Hans Laackmann (1906): Antarktische Tintinnen. – Zoologischer Anzeiger – 31: 235 - 239.
 - Hans Laackmann (1913): Adriatische Tintinnodeen – Sitzungsberichte der Akademie der Wissenschaften mathematisch-naturwissenschaftliche Klasse – 122: 123 - 167.
 - Karl Andreas Heinr. Brandt (1896): IV. Die Tintinnen – Zoologica (bis Bd 8 unter dem Namen Bibliotheca Zoologica) – 8_20: 45 - 72.
 - Sabine Agatha (2008): Redescription of the tintinnid ciliate Tintinnopsis fimbriata MEUNIER, 1919 (Spirotricha, Choreotrichida) from coastal waters of Northern Germany – Denisia – 0023: 261 - 272.
 - Michaela Strüder-Kypke, Denis Lynn (2008): Morphological versus molecular data - Phylogeny of tintinnid ciliates (Ciliophora, Choreotrichia) inferred from small subunit rRNA gene sequences – Denisia – 0023: 417 - 424.
 - Variation of lorica shape in the genus *Ptychocylis* (Protozoa: Tintinnia) in relation to species…
C.C. Davis (1981): Variation of lorica shape in the genus *Ptychocylis* (Protozoa: Tintinnia) in relation to species identification – J. Plankton Res. – 3: 433 - 443. - Wolfgang Petz, Weibo Song, Norbert Wilbert (1995): Taxonomy and ecology of the ciliate fauna (Protozoa, Ciliophora) in the endopagial and pelagial of the Weddell Sea, Antarctica – Stapfia – 0040: 1 - 223.
 - Erna Aescht [Wirnsberger] (2001): Catalogue of the Generic Names of Ciliates – Denisia – 0001: 1 - 350.
 - Julius Bernstein, W. Ebstein, Adolf von Koenen, Eduard Lampe, Richard Meyer (1911): Naturwissenschaftliche Rundschau. Wöchentliche Berichte über die Fortschritte auf dem Gesammtgebiete der Naturwissenschaften – Naturwissenschaftliche Rundschau – 26: 1 - 672.
 - Julius Bernstein, W. Ebstein, Adolf von Koenen, Victor Meyer, Richard Meyer, B. Schwalbe (1897): Naturwissenschaftliche Rundschau. Wöchentliche Berichte über die Fortschritte auf dem Gesammtgebiete der Naturwissenschaften – Naturwissenschaftliche Rundschau – 12: 1 - 672.
 
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Species (27)
- Ptychocylis urnula Claparède & Lachmann
 - Ptychocylis calyx
 - Ptychocylis glacialis
 - Ptychocylis obtusa ssp. obtusa
 - Ptychocylis urnula Claparède & Lachmann ssp. urnula
 - Ptychocylis obtusa ssp. acuta
 - Ptychocylis obtusa ssp. arctica
 - Ptychocylis obtusa ssp. typica
 - Ptychocylis obtusa ssp. cylindrica
 - Ptychocylis obtusa ssp. drygalskyi
 - Ptychocylis obtusa ssp. duplicata
 - Ptychocylis urnula ssp. minor
 - Ptychocylis urnula ssp. digitalis
 - Ptychocylis urnula ssp. major
 - Ptychocylis wailesi Kofoid & Campbell 1929
 - Ptychocylis acuta Brandt 1896
 - Ptychocylis amphorella Meunier ?
 - Ptychocylis arctica Brandt 1896
 - Ptychocylis basicurvata Meunier 1906
 - Ptychocylis galcialis Meunier 1910
 - Ptychocylis obtusa Brandt 1896
 - Ptychocylis drygalskii Brandt 1896
 - Ptychocylis minor Jörgensen 1899
 - Ptychocylis cylindrica Meunier 1910
 - Ptychocylis ostenfeldi Kofoid & Campbell 1929
 - Ptychocylis repanda Wailes 1925
 - Ptychocylis urnula Claparède & Lachmann 1858
 
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