Balanus trigonus Darwin, 1854

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, Zootaxa 3784 (3), pp. 201-223 : 216-217

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 ).

Figures

FIGURE 1. Map of sampling sites of the species recorded in the Persian Gulf and the Gulf of Oman.

FIGURE 10. Balanus trigonus Darwin, 1854, ZUTC-cirri 1169, Chabahar, Gulf of Oman; a. scutum, internal view; b. scutum, external view; c. tergum, external view; d. tergum, internal view; e-g. specimens from floating objects, top view.