FIG. 2 in The barnacles of Astreopora (Cirripedia, Pyrgomatini/ Scleractinia, Acroporidae): organization plans, host speci®city, species-richness and geographic range

FIG. 2. Scanning electron micrographs of shell and opercular plates of Hiroa stubbingsi Ross and Newman, 1973: (A) exterior of specimen from Sulawesi, Indonesia (RMNH C 2276) with opercular plates in place [see (D) for enlargement of area outlined on (A), and (E) for enlargement of the opercular region]; (B) carinal plate and portion of basis of specimen from Sabah (Borneo) showing grooves in basis into which the radial septa of the wall insert; (C) interior of partially disarticulated wall showing four parietal plates (note the rostrum contributes substantially less to the sheath than the carina despite their comparable widths); (D) radial ridge and marginal teeth of radial septum engaging a longitudinal groove of the basis [enlargement of outlined area in (A)]; (E) enlargement of the opercular plates in situ, illustrating interlocking of the teeth of the occludent margins of the scuta and the rows of pores; (F) articulate opercular valves of a specimen from New Caledonia illustrating the relationships of the large area for insertion of tergal depressor muscles and the relatively large spur of the tergum to the large, dependent limbus adductorum (adductor ridge) of the scutum (a, outer view; b, inner view); (G) disarticulated scuta and terga of a specimen from Sulawesi Indonesia (RMNH C 2276) (a and b, scuta; c and d, terga). Scale bars: (A±C, F, G)= 1 mm; (D, E)=0.1 mm.