New and little-known species of Didemnidae (Ascidiacea, Tunicata) from Australia (part 4) Author Kott, Patricia text Journal of Natural History 2007 2010-07-29 41 17 - 20 1163 1211 http://dx.doi.org/10.1080/00222930701359218 journal article 10.1080/00222930701359218 1464-5262 4669578 Didemnum membranaceum Sluiter, 1909 ( Figure 9A ) Didemnum membranaceum Sluiter 1909 , p 58 ; Kott 2001 , p 205 and synonymy; 2002, p 36 and synonymy including Diplosomoides [ sic ] membranaceum : Kott 2002 ; 2004c , p 56 and synonymy. Distribution Previously recorded (see Kott 2004c ): Western Australia ( Montebello Is , Houtman’s Abrolhos , Dongara , Shark Bay , Cockburn Sound ); Queensland ( Moreton Bay , Caloundra , Great Barrier Reef ); Western Pacific ( Timor Sea , Andaman Is , Indonesia, Micronesia, French Polynesia , Hong Kong ). New records: Queensland ( Northern Great Barrier Reef : 17.855 ° S , 146.585 ° E , 43 m , QM G308868 ; 14.685 ° S , 145.535 ° E , 27.3 m , QM G308854 ) . Description Sheet-like encrusting colonies have characteristic spicules crowded throughout, only about six stigmata per row in the small thoraces, a short retractor muscle, a short branchial siphon and a wide, open atrial aperture.