Cystodytes lobatus ( Ritter, 1900 )

Lambert, Gretchen, 2019, The Ascidiacea collected during the 2017 British Columbia Hakai MarineGEO BioBlitz, Zootaxa 4657 (3), pp. 401-436 : 405-406

publication ID	https://doi.org/10.11646/zootaxa.4657.3.1
publication LSID	lsid:zoobank.org:pub:86DD93B2-E8F4-4174-B105-9436357CB4B6
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treatment provided by	Plazi (2019-08-20 06:55:10, last updated 2024-11-29 11:27:52)
scientific name	Cystodytes lobatus ( Ritter, 1900 )
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Cystodytes lobatus ( Ritter, 1900)

Figure 3A, B View FIGURE 3

IHAK 50 BHAK 1726 UF 2538. Hakai Passage , Port Reef, about 21 m depth, Scuba .

IHAK 60 BHAK 3245 UF 2563. Rattenbury Pinnacle 17–20 m depth, Scuba .

XHAK 10 BHAK 2951 UF 2530. On settlement plate, 5 m depth. Very thin, colorless tunic, overgrowing barnacles and bryo- zoans. Spicules sparse.

This species occurs in two color morphs, either pink with reddish pink pigment granules in the tunic or white with no pigment granules. The colonies are thick, encrusting and irregular in shape, corresponding to the rocky substrates they overgrow, and may attain a size up to 10 cm or more across. The tunic spicules are flat, disc-like, and form an overlapping layer in the tunic that covers the abdominal region of every zooid ( Fig. 3B View FIGURE 3 ). The zooids are arranged in more or less circular systems, though both siphons of each zooid open independently on the tunic surface. Strong longitudinal muscles extending from the thorax to the abdomen make it very difficult to relax these zooids. See Lambert (1979) for a complete description. Distribution: British Columbia to southern California ( Van Name 1945; Abbott & Newberry 1980; Lamb & Hanby 2005).

References

Abbott, D. P. & Newberry, A. T. (1980) Urochordata: the tunicates. In: Morris, R. H., Abbott, D. P. & Haderlie, E. C. (Eds.), Intertidal Invertebrates of California. Stanford, California, Stanford University Press, pp. 177 - 226 + P 57 - P 67.

Lamb, A. & Hanby, B. P. (2005) Marine Life of the Pacific Northwest - A Photographic Encyclopedia of Invertebrates, Seaweeds and Selected Fishes. Harbour Publishing, Madeira Park, BC., 398 pp.

Lambert, G. (1979) Early post-metamorphic growth, budding and spicule formation in the compound ascidian Cystodytes lobatus. Biological Bulletin, 157 (3), 464 - 477. https: // doi. org / 10.2307 / 154103 1

Ritter, W. E. (1900) Some ascidians from Puget Sound, collections of 1896. Annals of the New York Academy of Sciences, 12, 589 - 616. https: // doi. org / 10.1111 / j. 1749 - 6632.1899. tb 54995. x

Van Name, W. G. (1945) The North and South American ascidians. Bulletin of the American Museum of Natural History, 84, 1 - 476.

Figures

FIGURE 3. Aplousobranchia, Polycitoridae. A, B: Cystodytes lobatus. A: whole colony, photo G. Paulay; B: small part of tunic showing disc–shaped spicules. C: Eudistoma purpuropunctatum 10 cm in width. D–F: Eudistoma ritteri. D: separated lobes of a colony; E: part of a different colony; F: thorax of single zooid showing the siphons and the three rows of stigmata. Scale bars: A, 1 cm; B, 0.5 mm; D, 1.3 cm; E, 0.5 cm; F, 1 mm.