. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 252 Bulletin Museum of Comparative Zoology, Vol. 145, No. 5 Table IV. Records for Microgloma turnerae new species. Cniise Sta. No. Depth (m) Speci- mens Latitude Longitude Gear Date Sarsia Sarsia Sarsia Discovery S-61 S-44 S-65 6709 WEST EUROPE BASIN 952 2 46°'N 4°36'W ES 1739 11 43°'N 3°'W ES 1922 148 46°15'N CANARIES BASIN 4°50'W ES 2351 5 27°'N 15°'W ES 1 mm Figure 14. Lateral views of a series of specimens of A'licrog/omo yonge; to show changes in shape with gro
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 252 Bulletin Museum of Comparative Zoology, Vol. 145, No. 5 Table IV. Records for Microgloma turnerae new species. Cniise Sta. No. Depth (m) Speci- mens Latitude Longitude Gear Date Sarsia Sarsia Sarsia Discovery S-61 S-44 S-65 6709 WEST EUROPE BASIN 952 2 46°'N 4°36'W ES 1739 11 43°'N 3°'W ES 1922 148 46°15'N CANARIES BASIN 4°50'W ES 2351 5 27°'N 15°'W ES 1 mm Figure 14. Lateral views of a series of specimens of A'licrog/omo yonge; to show changes in shape with growth. teeth and a distal incipient protuberance on both the anterior and the posterior hinge plate (Fig. 15). The soft parts are similar to those of M. ijongei. The mantle characters differ only in that the adductor muscles are apprecia- bly larger (average muscle scar/lateral mantle area ratio in M. turnerae , and in M. yongei ). The palps are somewhat smaller than those of M. yongei, each with 13-14 ridges. The basic plan of the hindgut is similar in the two species except that all the coils are adjacent and ventral to the digestive gland in M. turn- erae, whereas in M. yongei part of one coil lies dorsal to the digestive gland on the right side and alongside the final section of gut leading to anus (Figs. 11, 16, 17, 18, 19). Microgloma turnerae shows little pro- portional change with growth (Fig. 20), maintaining a height-to-length ratio of about and a breadth-to-length ratio of It reaches a maximum length only slightly greater than 1 mm, and we believe that this may be the smallest known free- living bivalve. Its absolute size range in our samples is from to mm. The shape of the histogram in Figure 21, with a precipitous drop in numbers at lengths greater than mm and a rapid though more gradual decline in numbers at lengths less than mm, suggest that the larger sizes were adequately sampled but the pro- gressively smaller s
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