Comprehensive Description

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Yoldia (Yoldiella) chilenica DALL, n. sp.



Shell small, tumid, white with a polished pale yellow periostracum, inequilateral, the anterior side shorter, rounded; posterior longer, rounded below, straight above, and almost pointed at the upper posterior angle; ligament obscure, amphi­detic; beaks low, adjacent, showing the protoconch; no lunule, a feebly impressed escutcheon with the valve margins medially prominent; surface of the disk feebly, irregularly, concentrically striated; valves not gaping; interior white, porcel­lanous, with a wide but short pallial sinus, rounded in front; seventeen posterior and nineteen anterior hinge teeth separated by a short gap with a small, deep, triangular pit for the resilium. Length of shell, 11.5 ; of posterior end, 6.0; alt. 6.5 ; max. diam. 5.2 mm.


U. S. S. "Albatross," station 2731, on the southern coast of Chile (Lat. 51°52' S.), in 348 fathoms, mud, bottom temperature 50° F. U. S. N. Mus. 96,923. Also at station 2782, in 258 fathoms, mud, temperature, 48° F.


This pretty little species looks something like the young of Y. thraciaeformis (cf. Hanley, Mon. Nuculacea, fig. 4), but is entirely unlike any species reported from the region mentioned.”



(Dall, 1908: 380-381)


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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