Euherdmania cf. digitata Millar, 1963

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 : 6-7

Euherdmania cf. digitata Millar, 1963 NEW RECORD

Figure 2B

As with all species in this genus, the zooids are separate, attached only by basal stolons. Siphons six-lobed, stomach plicated. U-shaped heart at posterior end of postabdomen.

#3869, very tiny immature colony. Zooids contracted and broken, no abdomens, gonads or larvae.

#4624, small transparent colony, pale yellowish zooids very contracted. Siphon lobes rounded, no additional serrations. Length of largest zooid in tunic up to 15 mm, out of tunic contracted, about 8 mm or less. Thorax with many fine longitudinal muscles. About 15 rows of stigmata. Stomach with about 8-10 longitudinal plications. Anus ends at posterior end of thorax. Gonads not well developed. A cluster of testes just behind the gut loop in the best zooid. No larvae.

Distribution: Fiji, Australia, Palau, Coral Sea, Tahiti, Ponape.

Detailed descriptions and illustrations: Millar (1963), Kott (1981, 1992), Monniot C. & Monniot F. (1987). Additional reference: Nishikawa (1984).

Figures

FIGURE 2. A: Didemnum psammatodes; B: Euherdmania cf. digitata; C, D: Diplosoma simile; E, F: Lissoclinum punctatum. Scale bars: A, 1 mm; B, 6 mm; D, 5 mm; E, 5 mm; F, 0.4 mm.