Amphibalanus zhujiangensis (Ren, 1989)

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 zhujiangensis (Ren, 1989) Figure 24a-j , Table 1: species no. 90

Balanus zhujiangensis Ren, 1989a: 467, fig. 2 (1-14).

Amphibalanus zhujiangensis : Pitombo 2004: 274; Puspasari et al. 2002: 235, figs 1A-G, 2A-H; Liu and Ren 2007: 501; Chan et al. 2009a: 238, fig. 204.

Material examined.

Ambon Island: 10 specimens, MZB Cru Cir 016, Galala, 3°41'22.2"S, 128°10'52.6"E, coll. P. Pitriana & D. Tala, 6 Sep 2016; 3 specimens, MZB Cru Cir 017, Laha, 3°43'22.5"S, 128°05'02.5"E, coll. P. Pitriana & D. Tala, 5 Sep 2016; 6 specimens, MZB Cru Cir 018, Talake, 3°41'59.4"S, 128°10'19.2"E, coll. P. Pitriana & D. Tala, 5 Sep 2016. Saparua Island: 10 specimens, MZB Cru Cir 019, Desa Pia, 3°30'20.4"S, 128°36'55.0"E, coll. P. Pitriana & D. Tala, 21 Sep 2016; 7 specimens, MZB Cru Cir 020, Negeri Mahu, 3°31'52.9"S, 128°41'12.4"E, coll. P. Pitriana & D. Tala, 11 Apr 2016; 1 specimen, MZB Cru Cir 021, Desa Mahu, 3°32'19.6"S, 128°41'17.3"E, coll. P. Pitriana & D. Tala, 11 Apr 2016. Seram Island: 5 specimens, MZB Cru Cir 022, Desa Kasie, 2°51'05.5"S, 128°32'54.1"E, coll. P. Pitriana & D. Tala, 20 Sep 2017; 3 specimens, MZB Cru Cir 010, Lepas Pantai Kawa, 2°57'32.5"S, 128°05'33.4"E, coll. P. Pitriana & D. Tala, 19 Sep 2017.

GenBank accession numbers.

COI gene (MK995334, MK995336, MK995337, MK995339), 18S (MK981347, MK981349, MK981350, MK981352).

Diagnosis.

Primary parietal tubes without transverse septa; exterior of shell with longitudinal striations; scutum without adductor ridge, external surface scutum with row of pits; anterior margin of cirri III with conical denticles, erect hooks below posterior angles of distal articles of rami present; cirrus IV with erect hooks on posterodistal angles of articles.

Description.

Shell six-plated, conic, purplish-white with longitudinal stripes of purple, not cross-hatched by transverse striations; parietes externally smooth, parietal tubes lacking transverse septa and subsidiary tubes; radii wide with slightly oblique summits; orifice rhomboidal, toothed (Fig. 24a-c ); scutum trigonal, exterior of scutum with single row of pits extending down centre of valve, occluding margin toothed, inner surface smooth, adductor ridge lacking; tergum with carinal margin convex, spur furrow open, basal margin straight on both sides of spur (Fig. 24d, e ); cirrus III without complex setae; cirri III-VI with erect hooks around posterior angle; first maxilla without notch, mandible with five teeth (Fig. 24h ). Basal length 5.8-21.6 mm; basal width 4.8-19.2 mm; height 2.1-16.5 mm; orifice length 3.0-10.0 mm; orifice width 2.6-7.6 mm (measurements for eleven specimens are presented in Suppl. material 1: Table S23).

Distribution.

Amphibalanus zhujiangensis was first recorded from the estuary of the Zhujiang River, South China Sea ( Puspasari et al. 2002). Afterwards found on Okinawa Island, Japan and Taiwan ( Chan et al. 2009a). In this study, A. zhujiangensis was found on the islands of Ambon Island (at Galala, Laha, and Talake), Saparua Island (at Dusun Pia, Negeri Mahu, Desa Mahu), and Seram Island (at Desa Kasie, Lepas Pantai Kawa) on stone and capitulum of Lepas anserifera (a map with the occurrence of Amphibalanus zhujiangensis in the Moluccas is shown in Suppl. material 1: Fig. S8).

Remarks.

The presence of a row of pits on the external surface of the scutum and the absence of an adductor ridge on the scutum are diagnostic for A. zhujiangensis . The species can be distinguished from A. variegatus by characters of the shell, cirri III and cirri IV; on A. reticulatus by characters of the shell and first maxilla. Amphibalanus zhujiangensis is distinct from A. thailandicus in lacking transverse septa in the longitudinal tubes and a notch on the first maxilla ( Puspasari et al. 2002).

Figures

Figure 24. Amphibalanus zhujiangensis (Ren, 1989) (MZB Cru Cir 018 - 5) a upper view b lower view c side view d external view of scutum and tergum e internal view of scutum and tergum f cirrus I g cirrus II h mandible i labrum j penis. Scale bars: 6 mm (a-c); 1 mm (d-g); 0.5 mm (h, i); 2 mm (j).