Poecilasma litum Pilsbry, 1907

Zhibin, Gan & Xinzheng, Li, 2019, Report on four deep-water barnacles (Cirripedia, Thoracica) from the north west Pacific, with remarks on Trianguloscalpellum regium (Wyville-Thomson, 1873), Zootaxa 4565 (2), pp. 201-212 : 207-209

Poecilasma litum Pilsbry, 1907

Figures 6, 7

Poecilasma kaempferi litum Pilsbry, 1907: 85 , pl. VI figs 1–2.

Poecilasma litum .— Jones et al. 2000: 238.— Liu & Ren 2007: 153, fig. 55.— Chan et al. 2009: 29, figs 21–22.

Material examined. NHS-SY-075-12-01, 9 specimens (CL 2.4–9.8 mm, CW 2.6–5.1 mm, PL 0.8–2.2 mm), Station SY075, Xisha mud volcano, South China Sea, depth 500–810 m, collected by the second author (XLi) with manned submersible Shenhaiyongshi, from onboard R/V Tansuoyihao, 20 May 2018.

FIGURE. 6 Poecilasma litum Pilsbry, 1907 . A, lateral view of specimen; B, tergum and scutum; C, lateral view of carina; D E, basal part of carina; F, lateral view of soft body; G, cirrus I; H, cirrus VI; I, caudal appendage.

FIGURE. 7 Poecilasma litum Pilsbry, 1907 . A, mouthparts; B, mandibular palp; C, mandible; D, maxillule; E, maxilla.

Distribution. South China Sea, southern part of East China Sea, Sagami Bay, Panama Bay, Florida Bay and Caribbean Sea.

Remarks. The present specimens (Figs 6A–I, 7A–E) correspond closely to the original description of Pilsbry (1907) and additional descriptions of Liu & Ren (2007) and Chan (2009). All the specimens attached to the dorsal surface of the carapace of a clawed lobster, Metanephrops neptunus ( Bruce, 1965) . Although captured from the marine mud volcano environment, M. neptunus appears to be an opportunist visitor to the mud volcano and carried the present specimens with it. The nucleotide sequences of 16S rRNA and mt COI gene from the present specimen were submitted to Genbank (genbank number: MH938356 and MH973611 , respectively)