Balanus trigonus Darwin, 1854 (Figs 10 a–g) Material examined. ZUTC-cirri 1167, 1168, 1169, 1170, 1171, 1172, 1173. Persian Gulf. Nilsson-Cantell (1938) from an unknown locality; Utinomi (1969) from Larak Island in Iran (Fig. 1); present study. Gulf of Oman. Nilsson-Cantell (1938) from an unknown locality; present study. General distribution and habitat. Cosmopolitan, ranging from tropical to temperate seas; fouling species on various substrata, littoral to sublittoral (Jones et al. 2000; present study). Descriptive features and remarks. Shell conic, with small triangle orifice. External surface of parietes ribbed, ribs white on red or pink field (Figs 10 e-g). Scutum externally with longitudinal rows of holes (Figs 10 b); tergum with spur wide (Figs 10 c, d). Largest specimen (ZUTC-cirri 1171) with basal diameter 17.56 mm, height 9.0 mm. The specimens were collected from various substrata such as littoral rocks, mollusc shells and floating objects at Nayband (27° 23'N, 52° 39'E), Parsian (27° 02'N, 53° 16'E), Jask (25° 41'N, 57° 53' E), Chabahar (25° 19'N, 60° 37'E) and Gwatr (25° 08'N, 61° 27'E) (Fig. 1).

Published as part of Shahdadi, Adnan, Sari, Alireza & Naderloo, Reza, 2014, A checklist of the barnacles (Crustacea: Cirripedia: Thoracica) of the Persian Gulf and Gulf of Oman with nine new records, pp. 201-223 in Zootaxa 3784 (3) on pages 216-217, DOI: 10.11646/zootaxa.3784.3.1, http://zenodo.org/record/251571