Synoicum pseudogrisiatum, Kott, 2008

Kott, Patricia, 2008, Ascidiacea (Tunicata) from deep waters of the continental shelf of Western Australia, Journal of Natural History 42 (15 - 16), pp. 1103-1217 : 1133

Key to the species of Synoicum occurring in Australian waters

The revised key to the genus Synoicum given below incorporates significant increases in the understanding of the genus resulting from recent works ( Kott 2006 and the present study), replacing that in Kott (1992a).

1. Stigmata in four rows.................... S. bowerbanki Millar, 1963 Stigmata in more than four rows............................ 2

2. Atrial tongue from body wall anterior to the atrial opening............ 3 Atrial tongue from anterior rim of the atrial opening............. 7

3 Colony a vertical cone with parallel common cloacal canals converging to terminal aperture................ S. laboutei Monniot, F. and C., 2006 Colony not a vertical cone with parallel common cloacal canals converging to terminal aperture..................................... 4

4. Sand absent from upper surface............ S. macroglossum Kott, 1992 Sand forms a layer on outer surface.......................... 5

5. Systems 1–4 per colony................... S. pseudogrisiatum sp. nov. Systems.4 per colony................................... 6

6. Colony mushroom-shaped...................... S. syrtis Kott, 2006 Colony not mushroom-shaped...... S. papilliferum ( Michaelsen, 1930)

7. Zooids conspicuous along each side of narrow common cloacal canals.... 8 Zooids not conspicuous along each side of narrow common cloacal canals 10

8. Common cloacal canals regular circles........................... 9 Common cloacal canals not regular circles.. S. longistriatum Kott, 1992