Armatobalanus allium (Darwin, 1854)

(Figs 5 a–g)

Material examined. ZUTC-cirri 1186.

Persian Gulf. No record.

Gulf Oman. First record from the Gulf of Oman.

General distribution and habitat. Indo-West Pacific; attached to or embedded in scleractinian corals (Jones et al. 2000).

Descriptive features and remarks. Shell conic, white, smooth or ragged (Fig. 5 e), sheath white or pale purple. Radii and alae white, tergum and scutum (Figs 4 a–d) white, tinged purple internally apically. Orifice small, oval or rhomboid. Basis of surface specimens flat, cup-shaped in embedded specimens. Scutum with adductor ridge not prominent, lateral depressor muscle pit not deep (Fig. 5 c). Tergum with long beak, longitudinal furrow shallow (Fig. 5 b). Labrum with two long teeth on each side of notch (Fig. 5 g). Cirrus III with oblique teeth on anterior margin of segments (Fig. 5 f). Largest specimen with basal diameter15.0 mm, height 11.87 mm, rostrocarinal diameter of orifice 3.18 mm.

The specimens were collected from a scleractinian coral (Fig. 5 e) in Chabahar Bay (25° 19'N, 60° 37'E) (Fig. 1).