Gastrocopta euryomphala Pilsbry, 1934
“The large umbilicus and conspicuously convex whorls distinguish this from all other known Philippine species. The specimens were received through Mr. Walter F. Webb, without name, but I think that they are without much doubt the species which von Moellendorff called Leucochilus euryomphalum (Abhandl. Naturf. Ges. Gorlitz, vol, 22, p. 153; 1898) from Tangat, Busuanga, and which, as I noted in vol. 24, p. 141, seems not to have been described.” (Pilsbry, 1934)
Pilsbry (1934) original descriptions on Gastrocopta (Cavipupa) euryomphala – “The shell is thin, whitish (dead), widely and deeply umbilicate, conic, composed of 4 ½ very convex whorls, the penultimate whorl bulging very conspicuously, the last whorl becoming flattened peripherally in its last half, and marked with a short groove over the position of the lower-palatal fold; without swelling or crest behind the outer lip. Suture very deep. Sculpture of microscopic granulation on the first whorl, the later whorls with fine, somewhat uneven growth striae. The aperture is shortly oval, with rather thin, broadly expanded and continuous peristome, the upper margin either free or shortly adnate to the preceding whorl. Parietal lamella straight and rather strong; angular lamella short, uniting with the parietal at the front third of the length of the latter. Columellar lamella median, strong, turning down a little at its inner end. Lower-palatal fold strong, elongate, the upperpalatal and basal folds tuberculiform.”
Gastrocopta (Cavipupa) euryomphala – “Length 2.1-2.2 mm., diam. 1.3 mm.” (Pilsbry, 1934)
Type locality – “Philippine Islands: Bintuan, Busuanga” leg. Quadras (Pilsbry, 1934)