Agnesia complicata Kott, 1954 accepted as Caenagnesia bocki Ärnbäck-Christie-Linde, 1938 (original description)
Ascidia plicata Kott, 1954 accepted as Ascidia translucida Sluiter, 1890 (original description)
Cnemidocarpa longata (Kott, 1954) (basis of record)
Cystodytes tasmanensis Kott, 1954 accepted as Lissoclinum tasmanense (Kott, 1954) (original description)
Leptoclinides kerguelenensis Kott, 1954 (original description)
Leptoclinides multilobata Kott, 1954 accepted as Leptoclinides multilobatus Kott, 1954 (original description)
Leptoclinides multilobatus Kott, 1954 (original description)
Molgula kerguelenensis Kott, 1954 (original description)
Molgula macquariensis Kott, 1954 (original description)
Molgula spiralis Kott, 1954 (original description)
Molguloides tenuis Kott, 1954 (original description)
Paraeugyroides macquariensis Kott, 1954 accepted as Pareugyrioides macquariensis Kott, 1954 (original description)
Pareugyrioides macquariensis Kott, 1954 (original description)
Polycitor columna Kott, 1954 (original description)
Polysyncraton papyrus Kott, 2001 (basis of record)
Polysyncraton tasmanense Kott, 2001 (additional source)
Sidnyum antarcticum Kott, 1954 accepted as Aplidium circumvolutum (Sluiter, 1900) (original description)
Sidnyum punctans Kott, 1954 accepted as Aplidium circumvolutum (Sluiter, 1900) (original description)
Sidnyum radiatum (Sluiter, 1906) accepted as Aplidium radiatum (Sluiter, 1906) (original description)
Styela longata Kott, 1954 accepted as Cnemidocarpa longata (Kott, 1954) (original description)
Styela papillata Kott, 1954 accepted as Polycarpa papillata (Sluiter, 1885) (original description)
Sycozoa tasmanoides Kott, 1954 accepted as Sycozoa murrayi (Herdman, 1886) (original description)
Synoicum circumvolutum Kott, 1954 accepted as Aplidium irregulare (Herdman, 1886) (original description)
Trididemnum cristatum Kott, 2001 (source of synonymy)

Holotype AM Y1541, geounit Tanzanian Exclusive Economic Zone, identified as Polysyncraton tasmanense Kott, 2001

 Synonymy

 for Trididemnum cristatum Kott, 2001

Kott, 1954: Didemnum mortenseni (part, specimen AM Y2321, statn 115) [details]