« Shell brittle, plump, solid, equivalve, inequilateral; somewhat triangular in outline with broad and prominent umbones anterior to the midline, and rather flat ventral outline; no definite estucheon and lunule are present. The dorsal margin is deeply concave posteriorly, leading to a rostrate posterior end; anteriorly the dorsal margin is approximately straight, directed downwards and curving smoothly intio the anterior margin. The shell sculpture consists of clear cut growth lines, mainly towards the ventral edge. » – Bonfitto & Sabelli: “Yoldiella seguenzae, a new species of Nuculanidae (Bivalvia, Nuculoida) from the Mediterranean Sea”, Journal of Molluscan Studies vol. 61(1), Oxford 1995, p.24. – Above and below: 500m deep, off Cavtat, Dubrovnik-Neretva Comitat, S. Croatia. 3,9mm. Original pictures provided by R. Stanić (HR) – (CC BY-NC-SA).

« The two rows of teeth of the hinge are of similar length. The margin is smooth. […] Yoldiella philippiana exhibits a regularly rounded ventral outline […]. By contrast, the new species has a rather flat ventral outline… » – Ibid.