Synoicum sacculum Kott, 1992

Kott, Patricia, 2006, Observations on non-didemnid ascidians from Australian waters (1), Journal of Natural History 40 (3 - 4), pp. 169-234: 199-200

publication ID

http://doi.org/ 10.1080/00222930600621601

persistent identifier

http://treatment.plazi.org/id/011D87C1-FFEC-CD62-1FCA-FB1AE0ABFD08

treatment provided by

Felipe

scientific name

Synoicum sacculum Kott, 1992
status

 

Synoicum sacculum Kott, 1992  

( Figure 10A, B View Figure 10 )

Synoicum sacculum Kott 1992a, p 499   and synonymy.

Distribution

Previously recorded (see Kott 1992a): South Australia (Great Australian Bight, Gulf St Vincent, West I., Thorny Passage); Victoria (Flinders); Tasmania (W. Granville Harbour). New records: South Australia (Kangaroo I., Vivonne Bay , 2–3 m, SAM E2864 View Materials ; ‘‘The Arches’’, 10–12 m, E3288)   .

Description

The colonies consist of irregular sandy cushions to 3 cm diameter or lobes up to 1 cm high and 0.5 cm diameter. The lobes are concave on the upper surface. Basally they are attached to a common basal mat. Sand is present on and in the test and is absent only from around the thoraces at the top of each lobe. The especially small (4 mm long) zooids, obscured by sand, are arranged in two or three circular systems (each of up to 10 zooids) per lobe. The common cloacal openings can be seen only when the sand is removed from the delicate test. Zooids have the usual short synoicid atrial siphon with an atrial lip from the upper rim of the opening and a small median papillum from the mid-line just behind the atrial aperture. Stomach walls are mulberry-like with rounded pouches in the internal lining. In preservative the test and zooids are a yellowish colour and the preservative is also stained yellow.

Remarks

The specimens, including their colour and the colour of the preservative, are consistent with previous descriptions of this species. A projecting brood pouch containing a single embryo from the postero-dorsal corner of the thorax has been reported in previously described specimens although these pouches were not found in the present material. The mulberry-like stomach, small colony lobes together with the numerous larval lateral ampullae help to distinguish this temperate species.

SAM

South African Museum

Kingdom

Animalia

Phylum

Chordata

Class

Ascidiacea

Order

Aplousobranchia

Family

Polyclinidae

Genus

Synoicum

Loc

Synoicum sacculum Kott, 1992

Kott, Patricia 2006
2006
Loc

Synoicum sacculum

Kott P 1992: 499
1992