Diplosoma gumavirens Hirose and Oka, 2009

Hirose, Euichi & Nozawa, Yoko, 2020, Fig. 6 in Bruggmanniella sanlianensis Lin, Yang & Tokuda, 2020, sp. nov., Zoological Studies 59 (19), pp. 1-11 : 3

Diplosoma gumavirens Hirose and Oka, 2009

Specimens: NMNS-8141-001 (Maobitou), -017 (Shimen), -018 (Wushibi), -019 (Xiaoyeliu).

D. gumavirens colonies occurred on coral limestone in Maobitou, and many were also found on hydrozoan colonies in Shimen, Wushibi, and Xiaoyeliu ( Fig. 2C ). The colonies were small cushions of about 1 mm thick and entirely green due to Prochloron cells in the common cloacal cavity. There are no tunic spicules in Diplosoma species. In the thorax, there were 4 rows of stigmata, and the pattern of stigmata was always 5-5- 5-4 that means 5 stigmata in the first (top) row, 5 in the second row, 5 in the third row, and 4 in the fourth (bottom) row ( Fig. 2D ). The retractor muscle emerged from halfway down the esophagus ( Fig. 2D ).

Figures

Fig. 2. Didemnum and Diplosoma species. (A, B), Didemnum molle at Shimen (A, colonies; B, tunic spicules). (C, D), Diplosoma gumavirens at Xiaoyeliu (C, colonies; D, thorax with 5-5-5-4 pattern of stigmata). (E, F), Diplosoma ooru at Gonzibi (E, colonies; D, thorax with 5-6-5-4 pattern of stigmata). (G, H), Diplosoma simile at Maobitou (G, colonies; H, thorax with 6-6-6-5 pattern of stigmata). (I, J), Diplosoma virens at Gonzibi (I, colonies; J, thorax with 6-6-6-5 pattern of stigmata). (K, L), Diplosoma watanabei at He-mei (K, colonies; L, thorax with 6-7-6-5 pattern of stigmata). White arrows in A indicate some cloacal aperture. an, anus; es, esophagus; rm, retractor muscle. Scale bars: B = 20 µm; D, F, H, J, L = 0.1 mm.