. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 25. Fig. 25 Yoldiella bilanta. Lateral views of three shells from the right side and internal view of a left valve to show the hinge-plate. Specimens from Sta. 192 Cape Basin. (Scale = mm). 50 30 80 W/L •; *. H/L 60 60H 50 PL/TL . v —i— 5 Length (mm) Fig. 26 Yoldiella bilanta. Variation in the ratios of height H/L, width W/L, and postero-umbonal length PL/TL to length against length of samples from Sta. 191 (open triangles) and Sta. 192 (closed circles) Cape Basin. anteriorly directed foot. The lateral pa
. Bulletin of the Natural History Museum Zoology. DEEP-SEA PROTOBRANCHIA (BIVALVIA) 25. Fig. 25 Yoldiella bilanta. Lateral views of three shells from the right side and internal view of a left valve to show the hinge-plate. Specimens from Sta. 192 Cape Basin. (Scale = mm). 50 30 80 W/L •; *. H/L 60 60H 50 PL/TL . v —i— 5 Length (mm) Fig. 26 Yoldiella bilanta. Variation in the ratios of height H/L, width W/L, and postero-umbonal length PL/TL to length against length of samples from Sta. 191 (open triangles) and Sta. 192 (closed circles) Cape Basin. anteriorly directed foot. The lateral papillae of the foot are not so well-developed as those in Y. capensis. The specimens from the Cape Verde Basin are somewhat smaller and have a slightly deeper shell than those from the Cape Basin. There appear also slight differences in the size of the posterior adductor muscle and the gills, but these may be a result of distortion following preservation. Such small differences are within the normal variation of yoldiellid species and at most represent a population difference. Yoldiella artipica (new species) TYPE LOCALITY. Atlantis II, Cruise 42, Angola Basin, , 9°'S, 10°57'0E - 10°'E, Epibenthic Dredge, 2644-2754 m. Sta. 200, 9°'S - Type specimen. : Holotype: BM(NH) 1992021, Paratypes: in collection held by Allen. Material. Cruise Sta Depth No Lat Long Gear Date (m) ANGOLA BASIN Atlantis II 200 2644- 25 9°'S 10°'E ES 42 2754 -9°'S 10°'E Walda DS20 2514 2 2°'S 8°'E ES Restricted to the abyssal rise of the south east Atlantic. Depth range: 2514-2754 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 Natural History Museum (London). Andover : Intercept
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