Lissoclinum concavum Kott, 2001

Kott, Patricia, 2005, New and little-known species of Didemnidae (Ascidiacea, Tunicata) from Australia (Part 3), Journal of Natural History 39 (26), pp. 2409-2479 : 2464-2465

publication ID	https://doi.org/ 10.1080/00222930500087077
persistent identifier	https://treatment.plazi.org/id/7352D565-FB0A-FF8B-FE6A-FA5B66C3FD58
treatment provided by	Felipe
scientific name	Lissoclinum concavum Kott, 2001
status

Treatment

Lissoclinum concavum Kott, 2001 View in CoL

( Figure 21G View Figure 21 )

Lissoclinum concavum Kott 2001, p 303 View in CoL .

Distribution

Previously recorded (see Kott 2001): South Australia (Flinders I., Wright I., Franklin I.). New record: Tasmania (Forestier Peninsula, SAM E3242 View Materials ) .

Description

The newly recorded colony is soft with large, sessile common cloacal canals. Branchial apertures appear to be depressed into the surface, although this is not conspicuous because the colony is so soft. The test contains morula bodies that make the test cloudy. Spicules are evenly but sparsely distributed throughout. Zooids are in clumps of six to eight clustered around a short, thin test connective anchoring them to the basal test. Abdomina are in these test connectives and are not in the basal test.

The thorax has up to 10 stigmata in each half row. The straight vas deferens extends anteriorly from the centre of a rosette of eight male follicles .

Remarks

The newly recorded colony extends the known range of this temperate Australian representative of the aureum group of Lissoclinum spp. (see Kott 2001), characterized by its numerous testis follicles rather than one or two. Spicules of the newly recorded specimen are sparser than previously recorded for this species, in which their occurrence is known to be variable. In the related tropical species, L. multifidum , abdomina are embedded in the basal test rather than being slung across the common cloacal cavity in a test connective between surface and basal test.