. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) Table 2 Yoldiella jeffreysi; ratios of Posterior Length (PL), Height (H), Width (W), to Total Length (TL) and other parameters. 65 Basin Max. recorded length (mm) PL/TL (mean) H/TL (mean) W/TL (mean) ProdissoconchN length () W. European Incal DS07 Canary Sta. 6704 Cape Verde 85216 N. America Sta. 126 Guyana Sta. 291 Argentine Sta. 259 48/60 69/75 33/53 187-198 (54) (54) (72) (45) 52/58 68/75 32/48 185-198 (17) (56) (70) (41) 51/56 70/76 38/46 190-200 (52) (54) (72) (42) 47/55 69/77 35/52
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) Table 2 Yoldiella jeffreysi; ratios of Posterior Length (PL), Height (H), Width (W), to Total Length (TL) and other parameters. 65 Basin Max. recorded length (mm) PL/TL (mean) H/TL (mean) W/TL (mean) ProdissoconchN length () W. European Incal DS07 Canary Sta. 6704 Cape Verde 85216 N. America Sta. 126 Guyana Sta. 291 Argentine Sta. 259 48/60 69/75 33/53 187-198 (54) (54) (72) (45) 52/58 68/75 32/48 185-198 (17) (56) (70) (41) 51/56 70/76 38/46 190-200 (52) (54) (72) (42) 47/55 69/77 35/52 182-189 (38) (51) (73) (40) 48/58 69/76 34/43 200-210(35) (54) (73) (40) 44/60 69/75 36/49 182 (25) (53) (72) (41). Fig. 101 Yoldiella jeffreysi. Lateral view of a shell from the left side and an inner view of a right valve to show detail of the hinge-plate. Specimens from Sta. 316, West European Basin. (Scale = mm). The populations in different basins also differ somewhat in overall shape (Fig. 105). In the Atlantic, more southerly populations are somewhat less inflated and large specimens have an extended posterior margin and thus a more inequilat- eral shape. Overall, populations in the western Atlantic have a similar shape to the majority of specimens from the northern part of the West European Basin and they are inflated to a similar degree. The more southern populations are more extended posteriorly. Specimens from the Argen- tine Basin are slightly more inflated but less so than those from the northern West European Basin. It is a general feature of all populations that the width/ length and post-umbonal length/total length increase with increasing length. In contrast, there is little change in the height/length ratio (Fig. 105). The inter- and intra- variability in the shape of populations of deep sea protobranchs has been noted in many taxa and most recently for the family Malletiidae (Sanders & Allen 1985). Yoldiellid species are no exception and Y.
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