Aplidium, Savigny, 1816

Lambert, Gretchen, Lee, Serina Siew-Chen & Teo, Serena Lay-Ming, 2021, Ascidians collected during the 2013 Singapore Strait International Marine Biodiversity Workshop, Zootaxa 4933 (1), pp. 1-38 : 11-13

Aplidium sp./spp.

#0154G, one small immature colony on Herdmania pallida ( Heller, 1878) . Living zooids with bright orange/red thorax, yellow stomach with many narrow folds. Stigmatal rows not counted.

#0161, four very small heads attached to branching brittle bryozoans. Largest heads about 8 mm across, with short stalk, total height of tallest 12 mm. Clear tunic, zooids small, only about 3mm in length, pinkish in formalin.Oral siphon with six lobes, atrial languet wide, rounded, apparently without lateral lobes. About eight rows of stigmata, one zooid, perhaps immature, with only six rows of stigmata. Stomach with numerous very narrow plications.

#1218, #1229, #2590, #2656, #3782, #3783, colonies all resemble one another and are tentatively hypothesized to be the same species but are small, all immature, about 13 mm across, white translucent in formalin but yellow in life with yellowish/orange zooids. Zooids only 2-3 mm long if contracted, otherwise about 5 mm in length. Oral siphon with six lobes, atrial languet tongue shaped, apparently without side lappets. About ten rows of stigmata, some zooids with fewer. Many longitudinal slender stomach folds (19+) not bifurcated or branching. With immature larvae in thorax of some zooids. #3782, zooids relaxed, 7 mm in length, very slender, no larvae; #3783, zooids contracted and about 4 mm in length with seven to nine stigmata rows, no larvae.

#2590, puffy tan colony on crab. Large mushroom shaped cap with small attachment stalk. Cap flattened, 4.3 cm across. Four long oral tentacles with 2-3 short ones between each long one. Atrial languet long, without side flanges or any toothing at the end. Most zooids with eight rows of stigmata; one with very short ninth row. About 23 stigmata per half row anteriorly. Stomach with many narrow parallel longitudinal rows of ridges; anus bilobed. No larvae.

#3842, two colonies, purple thick cushions, long zooids up to 11mm in length, mostly postabdomen. In one zooid, thorax 2 mm, abdomen 2.3 mm. Fourteen rows of stigmata, 10-13 folds of yellow stomach. Does not match any spp. in Monniot F. & Monniot C. (2001, 2006, 2008), Monniot F. (1987), or Kott (1992).

#3865, small, white, translucent; thorax with white pigment around oral siphon. Eight rows of stigmata, many narrow parallel stomach ridges. No larvae.

#4635, small whitish translucent colony 1.5 cm long with two heads, on a piece of shell, with grains of coarse sand attached to the underside. Zooids 2-3 mm long, atrial languet without side branches, eight rows of stigmata. Some white pigment granules on the mantle.