Yamaguchiella coerulescens (Spengler, 1790)

Pitriana, Pipit, Valente, Luis, von Rintelen, Thomas, Jones, Diana S., Prabowo, Romanus E. & von Rintelen, Kristina, 2020, An annotated checklist and integrative biodiversity discovery of barnacles (Crustacea, Cirripedia) from the Moluccas, East Indonesia, ZooKeys 945, pp. 17-83 : 17

Yamaguchiella coerulescens (Spengler, 1790) Figure 18a-g , Table 1: species no. 64

Lepas coerulescens Spengler, 1790: 191.

Tetraclita coerulescens : Darwin 1854: 342, pl. 11 figs 4a-d; Hoek 1883: 161, pl. 13 fig. 34; Pilsbry 1916: 259; Nilsson-Cantell 1938: 77; Newman and Ross 1976: 47; Dong et al. 1982: 111; Zevina et al. 1992: 48, fig. 31.

Yamaguchiella (Yamaguchiella) coerulescens : Ross and Perreault 1999: 5; Jones and Hosie 2016: 271; Chan et al. 2009a: 202, fig. 173.

Material examined.

Ambon Island: 13 specimens, MZB Cru Cir 123, Gudang Arang, 3°42'07.2"S, 128°09'43.7"E, coll. P. Pitriana & D. Tala, 5 Sep 2016; 4 specimens, MZB Cru Cir 124, Dermaga Tulehu, 3°35'05.4"S, 128°19'43.3"E, coll. P. Pitriana & D. Tala, 7 Sep 2016; 5 specimens, MZB Cru Cir 125, Tulehu, 3°35'21.8"S, 128°20'02.8"E, coll. Adin, 19 Sep 2017; 14 specimens, MZB Cru Cir 126, Doc Tawiri, 3°42'10.1"S, 128°06'13.4"E, coll. P. Pitriana & D. Tala, 29 Mar 2016; 8 specimens, MZB Cru Cir 127, Tawiri, 3°42'10.1"S, 128°06'13.4"E, coll. P. Pitriana & D. Tala, 5 Sep 2016; 2 specimens, MZB Cru Cir 128, Galala, 3°41'22.2"S, 128°10'52.6"E, coll. P. Pitriana & D. Tala, 6 Sep 2016; 11 specimens, MZB Cru Cir 129, Waai, 3°33'23.5"S, 128°19'33.9"E, coll. P. Pitriana & D. Tala, 7 Sep 2016; 4 specimens, MZB Cru Cir 130, Pelabuhan Yos Sudarso, 3°41'36.5"S, 128°10'35.6"E, coll. P. Pitriana & D. Tala, 6 Sep 2016. Saparua Island: 1 specimen, MZB Cru Cir 131, Kulur, 3°29'48.5"S, 128°36'10.7"E, coll. P. Pitriana & D. Tala, 20 Sep 2016.

GenBank accession number.

18S (MK981381).

Diagnosis.

Shell with the upper part tinged greenish-blue, longitudinally ribbed; radii moderately wide, with their summits oblique; scutum with a small adductor and extremely prominent articular ridge, united together and forms a small sub-cylindrical cavity; tergum with the spur not joined to the basi-scutal angle.

Description.

Shell low conical to cylindro-conic (Fig. 18c ) with four multi-tubiferous plates (Fig. 18b ), parieties greenish or greyish with radiating lines (Fig. 18a ); radii wide, summits oblique; basis calcareous, radii wide, tubiferous, summits oblique; orifice occluded wholly by scutum (Fig. 18a ); scutum and tergum strongly articulated (Figs 18d, e ); mandible with four teeth, the third teeth is tridentate (Fig. 18g ); labrum with three large teeth on each side of cutting edge; penis with basidorsal point. Basal length 8.3-29.0 mm, basal width 8.5-27.8 mm, height 5.7-17.7 mm. Orifice length 4.2-11.5 mm, orifice width 3.2-11.8 mm (measurements for 25 specimens are presented in Suppl. material 1: Table S17).

Distribution.

Yamaguchiella coerulescens was previously recorded from the Indo-west Pacific: the Indian Ocean, Bay of Bengal, Mergui Archipelago, Kei Islands, Banda Island, Malay Archipelago, Sulu Archipelago, Vietnam, China, Philippines, Goram Island, Palao Island, and Taiwan ( Jones and Hosie 2016). In this study, Y. coerulescens was found on Ambon Island (at Tulehu, Dermaga Gudang Arang, Waai, Doc. Tawiri, Liang, Galala, Dermaga Yos Sudarso) and Saparua Island (at Kulur) on stone (a map with the occurrence of Yamaguchiella coerulescens in the Moluccas is shown in Suppl. material 1: Fig. S6).

Remarks.

The subgenus Yamaguchiella was proposed by Ross and Perreault (1999) in honour of Toshiyuki Yamaguchi (Chiba University Japan), in appreciation of his contributions to the knowledge of recent and fossil barnacles.

Figures

Figure 18. Yamaguchiella coerulescens (Spengler, 1790) (MZB Cru Cir 123 - 2) a Upper view b lower view c side view d external view of scutum and tergum e internal view of scutum and tergum f maxillule g mandible. Scale bars: 7 mm (a-c); 1 mm (d, e); 0.5 mm (f, g).