Östergren, H. (1898). Das System der Synaptiden. <em>Öfversigt af Kongelige Vetenskaps-Akademiens Förhandlingar.</em> 55: 111-120.[details]
Deep-Sea (2021). Protankyra Östergren, 1898. Accessed at: https://www.marinespecies.org/deepsea/aphia.php?p=taxdetails&id=123450 on 2023-02-06
Glover, A.G.; Higgs, N.; Horton, T. (2023). World Register of Deep-Sea species (WoRDSS). Protankyra Östergren, 1898. Accessed at: https://marinespecies.org/deepsea/aphia.php?p=taxdetails&id=123450 on 2023-02-06
original descriptionÖstergren, H. (1898). Das System der Synaptiden. <em>Öfversigt af Kongelige Vetenskaps-Akademiens Förhandlingar.</em> 55: 111-120.[details]
basis of recordHansson, H.G. (2001). Echinodermata, <B><I>in</I></B>: Costello, M.J. <i>et al.</i> (Ed.) (2001). <i>European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels,</i>. 50: pp. 336-351. (look up in IMIS) [details]
additional sourceCherbonnier, G. (1988). Echinodermes: Holothurides. Faune de Madagascar 70: 1-292. (look up in IMIS) [details]
Present Inaccurate Introduced: alien Containing type locality
From other sources
Remark In Ordo: Apoda and in Subfamily: Heterournae in Heding (1940).
Type species: Synapta abyssicola Théel, 1886 by subsequent designation in fisher, W.K. (1907) (Rowe & Gates, 1995). [details]