Pelagic tunicates (Appendicularia and Thaliacea) of Sri Lanka: two first records with an annotated checklist Author Karunarathne, Krishan D. 0000-0003-1780-9749 Department of Aquaculture and Fisheries, Faculty of Livestock, Fisheries and Nutrition, Wayamba University of Sri Lanka, Makandura, Gonawila, 60170, Sri Lanka. & krishankarunarathne @ gmail. com; krishan. dk @ wyb. ac. lk; https: // orcid. org / 0000 - 0003 - 1780 - 9749 krishankarunarathne@gmail.com Author Croos, M. D. S. T. De 0000-0003-4449-6573 Department of Aquaculture and Fisheries, Faculty of Livestock, Fisheries and Nutrition, Wayamba University of Sri Lanka, Makandura, Gonawila, 60170, Sri Lanka. & dileepa _ dc @ yahoo. com; dileepad @ wyb. ac. lk; https: // orcid. org / 0000 - 0003 - 4449 - 6573 dileepa_dc@yahoo.com text Zootaxa 2021 2021-11-11 5067 3 352 376 journal article 3575 10.11646/zootaxa.5067.3.2 9b8d33b9-c9df-4f9d-abeb-de1c7b84f3e0 1175-5326 5681899 AF3DF45F-B248-4BDD-904F-F55D735DC867 Doliolum denticulatum Quoy & Gaimard, 1834 Doliolum denticulatum Quoy & Gaimard 1834: 599 , Pl. 89 Figs. 25–28. Herdman 1888: 44 . Smith et al . 1901: 103 , Fig. 23. Tokioka 1960: 353 . Godeaux 1998: 283 , Figs. 17.8b, 17.11d. Van Soest 1998: 236 , Table 14.1. Gershwin et al . 2014: 9 . Purushothaman et al . 2017 . Adam & Ishak 2018: 150 , Figs. 2.1, 2.2 . Material examined. A gonozooid and a nurse ( MDAFWU 2020 /371–372), St .205, January 2020 . Description. Gonozooid: Body 3 mm long, transparent and barrel-shaped with eight muscle bands. Dextral arched intestine, alimentary canal opens at the front side of M V, anus present at M VI. Branchial septum strongly arched from M II dorsally to M V, then curving and running to M III ventrally. Endostyle is short, from M II to M IV. Neural ganglion at M III 3/4. Testis long and swollen, situated horizontally in front of M III. Nurse: Barrel-shaped, 2 mm long, with nine muscle bands, without visceral mass, except for a heart. Muscle-bands M II–VIII fused into a continuous sheet. Budding on the dorsoventral projection. Global distribution. The Atlantic Ocean, Indian Ocean, western Pacific, Australian waters, the Mediterranean Sea and Red Sea ( Van Soest 1998 ). Type locality: Ile Vanikoro, Pacific.