Photosymbiotic ascidians from Pari Island (Thousand Islands, Indonesia) Author Hirose, Euichi Author Iskandar, Budhi Hascaryo Author Wardiatno, Yusli text ZooKeys 2014 422 1 10 http://dx.doi.org/10.3897/zookeys.422.7431 journal article http://dx.doi.org/10.3897/zookeys.422.7431 1313-2970-422-1 BE731D31B8124546A7F615BC51262158 Taxon classification Animalia Aplousobranchia Didemnidae Lissoclinum timorense (Sluiter, 1909) Fig. 2E Didemnum timorensis Sluiter, 1909 Didemnum voeltzkowi Michaelsen, 1920 Lissoclinum timorensis (Sluiter, 1909) Lissoclinum voeltzkowi (Michaelsen, 1920) Specimens. MZB. Asc. 00005 Habitat. Dead coral skeletons and clefts between coral limestones in back reef and shallow reef flat. Remarks . Colonies had linguiform projections of the tunic around the colony periphery and sometimes on the colony surface. Tunic contains both stellate and globular spicules (Fig. 1E, inset). Prochloron cells were distributed within the common cloacal cavity. Because the zooids of Lissoclinum bistratum and Lissoclinum timorense are very similar in morphology, Monniot and Monniot (2001) proposed that Lissoclinum timorense is a junior synonym of Lissoclinum bistratum . Typical colonies of the two species are easily distinguishable by the presence or absence of linguiform projections on the colony surfaces, although intermediate forms between the two exist. Kott (2001) discriminated the two species based on the presence or absence of stellate spicules. However, the two species defined by spicule type could not be discriminated by molecular phylogeny based on partial COI gene sequences ( Hirose et al. 2010b ). We did not find Lissoclinum bistratum -type colonies in the present survey, although they are common in reef crests of the Ryukyus.