. Breviora. 1970 THE LUCINOID FIMBRIA. Figure 5. External view of left valve of Finihrici ftnihriatn. length =z mm. from Yaniitha N Coast of Viti Levii (USNM 674576). Although the ecology of living Fimbria was not studied in the field, it is known that the species are reef-dwellers, preferring rela- tively shallow water in coralline sand (Nicol, 1950). The heavy, strongly ribbed shell is an adaptation to the coarse substrate which the species inhabits. Further, Fimbria probably lives near the sand-sea interface, for it possesses the anterior-posterior water- flow mechanisms of other
. Breviora. 1970 THE LUCINOID FIMBRIA. Figure 5. External view of left valve of Finihrici ftnihriatn. length =z mm. from Yaniitha N Coast of Viti Levii (USNM 674576). Although the ecology of living Fimbria was not studied in the field, it is known that the species are reef-dwellers, preferring rela- tively shallow water in coralline sand (Nicol, 1950). The heavy, strongly ribbed shell is an adaptation to the coarse substrate which the species inhabits. Further, Fimbria probably lives near the sand-sea interface, for it possesses the anterior-posterior water- flow mechanisms of other lucinoids but lacks the vermiform foot to construct a long anterior incurrent mucus tube. In addition to the family-level characteristics, Fitubria may be included in the Lucinacea because of the following anatomical features: 1) an extensive pedal gape; 2) the enlargement of the ventral surface of the anterior adductor muscle to facilitate an anterior inhalant current; and, 3) the relatively poorly differen- tiated and simple posterior incurrent Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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