Tetraclitella divisa (Nilsson-Cantell, 1921)

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

Tetraclitella divisa (Nilsson-Cantell, 1921) Figure 13a, b , Table 1: species no. 59

Tetraclita divisa Nilsson-Cantell, 1921: 362, fig. 83, pl. 3 fig. 11.

Tetraclitella (Tetraclitella) divisa : Ross and Perreault 1999: 6.

Tetraclitella divisa : Ross 1968: 13; Dong et al. 1982: 111; Foster 1974: 45, figs 6E-F, 7E- F; Bacon et al. 1984: 86; Paulay and Ross 2003: 308; Chan et al. 2009a: 208, fig. 178.

Material examined.

Ambon Island: 1 specimen, MZB Cru Cir 120, Laha, 3°43'22.5"S, 128°05'02.5"E, coll. P. Pitriana & D. Tala, 7 Sep 2016.

Diagnosis.

Shell with four plates, flattened, not strongly articulated; radii tubiferous; summit of radii horizontal; tergal spur well separated from scutal margin.

Description.

Shell depressed, covered by furry chitinous integument; shell plates with prominent radiating ribs; radii wide, porose, tubes running parallel to base of shell; colour of shell pale purplish; orifice diamond shaped (Fig. 13a, b ); scutum triangular, tergal margin straight; tergum higher than wide, scutal margin straight, spur short; mandible with four teeth, second and third teeth bidentate; labrum with smooth cutting edge (measurements for one specimen are presented in Suppl. material 1: Table S12).

Distribution.

Tetraclitella divisa was previously recorded from Western Africa, Java, Malaysia, Sumatra, Northern Australia, Singapore, South China Sea, China, Taiwan, Japan, the Pacific Ocean to Hawaii and Pitcairn ( Jones and Hosie 2016). In this study, T. divisa was found on Ambon Island at Laha on a concrete wall at the port (a map with the occurrence of Tetraclitella divisa in the Moluccas is shown in Suppl. material 1: Fig. S2).

Remarks.

Tetraclita divisa exhibits a brooded phase to the cypris larval stage in the mantle cavity, whereas most other species release the first stage nauplius ( Nilsson-Cantell 1921; Hiro 1939).

Figures

Figure 13. Tetraclitella divisa (Nilsson-Cantell, 1921) (MZB Cru Cir 120098) a upper view b side view. Scale bar: 4 mm.