Amphibalanus reticulatus (Utinomi, 1967)

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

Amphibalanus reticulatus (Utinomi, 1967) Figure 22a-o , Table 1: species no. 88

Balanus amphitrite var. (1) communis Darwin, 1854: 240, pl. 5 fig. 2e, h, l (part.).

Balanus amphitrite forma communis : Broch 1922: 314 (part.).

Balanus amphitrite forma hawaiiensis Broch, 1922: 314 (part.).

Balanus amphitrite communis : Hiro 1938a: 301, fig. 1a, b.

Balanus amphitrite cirratus : Zevina and Tarasov 1963: 89, fig. 10a-e.

Balanus amphitrite var. variegatus : Stubbings 1963a: 329, fig. 2a-e.

Balanus amphitrite variety: Southward and Crisp 1963: 43, fig. 23.

Balanus amphitrite tesselatus Utinomi, 1964: 52, pl. 26 fig. 11.

Balanus amphitrite var. denticulata : Karande & Palekar, 1966: 145, fig. 7, pl.1 fig. 7, pl. 4 row 5 (part.).

Balanus variegatus tesselatus Utinomi & Kikuchi, 1966: 5.

Balanus amphitrite amphitrite : Stubbings 1967: 271, fig. 14d-f (part.).

Balanus reticulatus : Utinomi 1967: 216, figs 9a, b, 10a, b, 11a-e, pl. 6 figs 7, 8 (part.); Dong et al. 1982: 91, fig. A-C; Zevina et al. 1992: 92, fig. 63; Puspasari et al. 2001b.

Amphibalanus reticulatus : Pitombo 2004: 274; Chan, et al. 2009a: 234, fig. 200; Pochai et al. 2017: 26, fig. 10; Xu 2017: 43, figs 10, 39.

Material examined.

Ambon Island: 5 specimens, MZB Cru Cir 012, Yos Sudarso, 3°41'36.5"S, 128°10'35.6"E, coll. P. Pitriana & D. Tala, 6 Sep 2016.

Diagnosis.

Primary parietal tubes with transverse septa; exterior of shell with longitudinal and horizontal striations; anterior margin of cirrus III with conical denticles, erect hooks below posterior angles of distal articles of rami present.

Description.

Shell conic or cylindric; six parietal plates, externally smooth, white with groups of well-spaced purple, or purple-pink vertical stripes intersecting with transverse striations (Fig. 22a, b ); parietes with single row of internal tubes; alae with summits moderately oblique; radii narrow, summits oblique; orifice toothed; basis calcareous, porous; scutum triangular, externally flat, internally adductor ridge conspicuous, short, low, well separated from prominent articular ridge; tergum flat, spur narrow, short, basiscutal angle acute, scutal margin straight; scutum triangular, occluding margin toothed; tergum flat, basiscutal angle acute, scutal margin straight (Fig. 22c, d ); cirrus II with simple spinules or conic teeth on outer face near anterior margin (Fig. 22f ); maxilla bilobed, dense setae on margin (Fig. 22k ); maxillule not notched, setae on upper and lower margins (Fig. 22l ); mandible with four teeth (Fig. 22m ); mandibular palp with setulae on lower margin, pinnate setae on upper margin; labrum simple with four teeth and setulae on crest on each side of deep notch (Fig. 22n ). Basal length 7.7-16.3 mm; basal width 2.9-15.5 mm; height 3.2-10.5 mm. Orifice length 3.5-8.9 mm; orifice width 2.5-7.1 mm (measurements for five specimens are presented in Suppl. material 1: Table S21).

Distribution.

Amphibalanus reticulatus is native to the Indo-Pacific region and has been introduced by shipping to tropical-subtropical waters of the Eastern Pacific ( Coles et al. 1999; Carlton et al. 2011). A. reticulatus can be found from Japan to the Malay Archipelago, east Asia from the Yellow Sea to Gulf of Siam, from Malaysia to southeast Africa, in the Mediterranean Sea, West Africa, the Southeast United States to the West Indies ( Henry and McLaughlin 1975).

In this study, A. reticulatus was found on the islands of Ambon (at the port of Yos Sudarso) on stone and concrete wall of the port (a map with the occurrence of Amphibalanus reticulatus in the Moluccas is shown in Suppl. material 1: Fig. S2).

Remarks.

Amphibalanus reticulatus can be confused with A. amphitrite . However, the shell of A. reticulatus exhibits clear vertical and horizontal striations, whilst A. amphitrite shows only vertical purple striations on all shell plates ( Henry and McLaughlin 1975).

Figures

Figure 22. Amphibalanus reticulatus (Utinomi, 1967) (MZB Cru Cir 012 - 1) a upper view b side view c external view of scutum and tergum d internal view of scutum and tergum e cirrus I f cirrus II g cirrus III h cirrus IV i cirrus V j cirrus VI k maxilla l maxillule m mandible n labrum o penis. Scale bars: 4 mm (a, b); 1 mm (c-g); 2 mm (h-j); 2 mm (o); 0.5 mm (k-n).