Opisthobranch molluscs from the Chagos Archipelago, Central Indian Ocean Author Yonow, Nathalie Author Anderson, R. Charles Author Buttress, Susan G. text Journal of Natural History 2002 2002-05-31 36 7 831 882 http://dx.doi.org/10.1080/00222930110039161 journal article 10.1080/00222930110039161 1464-5262 Phyllidia coelestis Bergh, 1905 (®gure 16b) Phyllidia coelestis Bergh, 1905: 182 , pl. 3, ®gure 16; Lin, 1983: 152, pl. 1, ®gure 3; Brunckhorst, 1989: 37 , numerous ®gures; Brunckhorst, 1993: 30 , pl. 1F, H. Phyllidia nobilis : Farran, 1905: 345 , pl. 3, ®gures 16, 17. Phyllidia elegans : Edmunds, 1972: 82 , ®gure 4B. Phyllidia alia Yonow, 1984: 224 , ®gures 6C, D, 7A, 8F, G. NOT Phyllidia picta Pruvot-Fol, 1957: 110 , ®gures 5±12 (as per Brunckhorst, 1993 ) (5 Fryeria picta ; see Yonow, 1996). Material. Chag96/32: 12 mm ; outer reef, Ile de la Passe, Salomon Atoll; 14 February 1996 ; at 15 m depth. Chag96/43a, b: 32 mm , 28 mm ; inner reef, Ile Diamant, Peros Banhos Atoll; 19 February 1996 ; at 3 m depth. Chag96/46: 16 mm ; outer reef, Ile Diamant, Peros Banhos Atoll; 20 February 1996 ; depth not recorded; no photographs taken. Chag96/53a, b: 25 mm , 22 mm ; inner reef, Ile Mapou, Peros Banhos Atoll; 21 February 1996 ; at 9 m depth; no photographs taken. Chag96/67: 353 15 mm ; coral bommie, east of Ile Poule, Peros Banhos Atoll; 25 February 1996 ; at 9 m depth; no photographs taken. Description. Ground colour pale granular blue. Three longitudinal black stripes, one on the midline interrupted by yellow tubercles; the two laterals were continuous but did not meet anteriorly between the rhinophores. Variable number of rounded, yellow tubercles arranged longitudinally; fewest in smallest specimen but otherwise no obvious correlation with size. Small black ¯ecks peripherally. Rhinophores slightly deeper yellow than tubercles. Geographic distribution. Indo-West Paci®c: Sri Lanka (Yonow, 1984 as P. alia ), the Seychelles (Edmunds, 1972 as P. elegans ) and South Africa ( Gosliner, 1987 as P. varicosa ) to Fiji ( Brunckhorst, 1993 ). Remarks. Brunckhorst (1989 , 1993 ) redescribed and illustrated this species; the majority of his material was from the Paci®c, where it also appears to be relatively common.