Glyptelasma gigas ( Annandale, 1916 )

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 : 205-207

Glyptelasma gigas ( Annandale, 1916)

Figures 4, 5

Poecilasma gigas Annandale, 1916: 299 , pl. IV fig. 4, pl. V figs 10–14, pl. VI figs 7–8.

Megalasma (Glyptelasma) gigas .— Calman 1919: 364, figs 1A–C.— Zevina 1982: 85, fig. 75. Glyptelasma gigas .— Broch 1931: 32, fig. 12.— Chan et al. 2010: 3, figs 1A, 3.— Jones & Hosie 2016: 245.

Material examined. NHS-SY-075-10, 68 specimens (CL 3.6–15.8 mm, CW 1.9–8.6 mm, PL 1.8–9.3 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.

Distribution. Indian Ocean, South China Sea, Malay Archipelago, Indonesia, Australia.

FIGURE. 4 Glyptelasma gigas ( Annandale, 1916) . A, lateral view of specimen; B, outer view of tergum and scutum; C, lateral view of carina; D, inner view of carina; E, lateral view of soft body; F, cirrus I; G, cirrus VI; H, caudal appendage.

FIGURE. 5 Glyptelasma gigas ( Annandale, 1916) . A, labrum; B, mandibular palp; C, mandible; D, maxillule; E, maxilla.

Remarks. The present specimen is immediately identifiable as Glyptelasma gigas by features of the carina and its large size. The capitular plates and the appendages of the soft body (Figs 4A–H, 5A–E) agree well with the original description of Annandale (1916) as well as with the descriptions and illustrations of Chan et al. (2010). The present specimens were densely attached to the limb of a gorgonian coral, with some smaller specimens attached to the larger ones. This species is recorded herein from the marine mud volcano environment for the first time. The nucleotide sequences of 16S rRNA and mt COI gene from the present specimen were submitted to Genbank (genbank number: MH938355 and MH973610 respectively)