Euraphia hembeli Conrad, 1837

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

Euraphia hembeli Conrad, 1837 Figure 10a-c , Table 1: species no. 53

Chthamalus hembeli Darwin, 1854: 465, fig. 5a-5d; Pilsbry 1916: 324.

Euraphia hembeli Conrad, 1837: 261, pl.20 fig.6; Newman and Ross 1976: 41; Foster and Newman 1987: 330; Southward et al. 1998: 120, fig. 1E; Paulay and Ross 2003: 307; Jones 2012: 372; Pochai et al. 2017: 17.

Material examined.

Ambon Island: 1 specimen, MZB Cru Cir 049, Asilulu, 3°40'50.4"S, 127°55'27.6"E, coll. Adin, 20 Sep 2017.

Diagnosis.

Shell with interlocking teeth between plates; base with a true calcareous and complete secondary calcification; scutum higher than wide and interlocked but not concrescent with tergum.

Description.

Shell with six plates, parietes symmetrical, calcareous, solid, separable, due to coarsely serrate sutures with interlocking toothed structure (Fig. 10a-c ); colour yellowish or brownish grey, inner surface of parietes smooth, white with dark brown and pale violet horizontal striations around aperture; external surface of shell irregularly ribbed around basal margin, basis calcareous; orifice rhomboidal; tergum and scutum separable; scutum triangular, occluding margin with strong teeth; tergum strongly marked with 10-12 lateral depressor crests, scutal margin strongly articulated. Measurements for one specimen are presented in Suppl. material 1: Table S9.

Distribution.

Euraphia hembeli has been recorded from the Mediterranean, West Africa, Indian Ocean: Ceylon; Andaman Sea, Cocos-Keeling Islands; Malay Archipelago (Sunda Islands); Pacific Ocean (Japan; Caroline Islands; Hawaiian Islands, California ( Newman and Ross 1976; Jones 2012; Barrett and Freeman 2016; Pochai et al. 2017). In this study, Euraphia hembeli was found on Ambon Island at Asilulu on rocks (a map with the occurrence of Euraphia hembeli in the Moluccas is shown in Suppl. material 1: Fig. S2).

Remarks.

Euraphia hembeli has a true calcareous basis and complete secondary calcification on its parietal wall and basis ( Southward et al. 1998). It can be also distinguished from other species of the genus Euraphia by its size (up to 30 mm) and the presence of strong marked lateral depressor crests (between 10-12 in number) ( Pochai et al. 2017).

Figures

Figure 10. Euraphia hembeli Conrad, 1837 (MZB Cru Cir 049) a upper view of E. hembeli which is overgrown with other species of barnacles in its operculum b right side view c left side view. Scale bar: 16 mm.