Belongs within: Clathurellidae.
The type subgenus of the genus Glyphostoma is an assemblage of conoid gastropods found in tropical regions of the Americas (Powell 1966).
Characters (Powell 1966): Shell small to moderately large, 4.5–18 mm, fusiform-biconic, solid, whorls angular or rounded, to bulging, but constricted at sutures. Spire height usually greater than that of aperture plus canal. Protoconch of about three whorls, tip small, without sculpture but strong keel developing at second whorl. Aperture usually long and narrow, with short anterior canal, which is slightly recurved and notched at termination. Outer lip strongly variced, both outer and inner lips heavily sculptured with denticles and ridges. Anal sinus on shoulder slope, wide, deep, often rim-margined, fasciole with strong growth wrinkles and obscure spirals. Sculpture of strong axial ribs crossed by spiral cords and threads. Radula consisting of pair of very long and slender curved marginals.
<==Glyphostoma Gabb 1872 (Glyphostoma)P66
|--*G. (G.) dentiferum Gabb 1872P66
|--G. (G.) addrina Mansfield 1925P66
|--G. (G.) aguadillana (Dall & Simpson 1901) [=Mangilia (G.) aguadillana]P66
|--G. (G.) aldrichi Maury 1910 [incl. Pleurotoma boadiceoides Maury 1910]P66
|--G. (G.) andersoni Oinomikado 1939P66
|--G. (G.) belonoides Gardner 1937P66
|--G. (G.) candida (Hinds 1843) [=Clavatula candida]P66
|--G. (G.) caronensis Mansfield 1925P66
|--G. (G.) celosia Fargo 1953P66
|--G. (G.) chipolanum Gardner 1937P66
|--G. (G.) ‘dalli’ (Bose & Toula 1910) (see below for synonymy)P66
|--G. (G.) elsae Bartsch 1934P66
|--G. (G.) epicasta Bartsch 1934P66
|--G. (G.) exopitatum Woodring 1928P66
|--G. (G.) gabbii Dall 1889P66
|--G. (G.) golfoyaquensis Maury 1917P66
|--G. (G.) gratula (Dall 1881) [=Pleurotoma (Drillia) gratula; incl. P. (D.) incilis Watson 1881]P66
|--G. (G.) guppyi Woodring 1928P66
|--G. (G.) ‘harrisi’ Maury 1910 non Aldrich 1895P66
|--G. (G.) herminea Bartsch 1934P66
|--G. (G.) immaculata Dall 1908P66
|--G. (G.) ischnon Gardner 1937P66
|--G. (G.) johnsoni Dall 1892P66
|--G. (G.) leonensis Mansfield 1930P66
|--G. (G.) macneili Mansfield 1935P66
|--G. (G.) marionae Fargo 1953P66
|--G. (G.) mexicana (Toula 1911) [=Pleurostoma (G.) mexicana]P66
|--G. (G.) nannophues Gardner 1937P66
|--G. (G.) neglecta (Hinds 1843) [incl. Lioglyphostoma armstrongi Hertlein & Strong 1955]BC01
|--G. (G.) obtusa (Martin 1904) [=Mangilia (G.) obtusa]P66
|--G. (G.) partefilosa Dall 1919P66
|--G. (G.) perieilema Gardner 1937P66
|--G. (G.) phalera Dall 1889P66
|--G. (G.) pilsbryi Schwengel 1940P66
|--G. (G.) polysculptum Fargo 1953P66
|--G. (G.) pustulosa McLean & Poorman 1971BC01
|--G. (G.) sapita Fargo 1953P66
|--G. (G.) scoptes Dall 1903P66
|--G. (G.) subflexuosa (Whitfield 1894) [=Drillia subflexuosum]P66
|--G. (G.) thalassoma Dall 1908P66
|--G. (G.) tiarophoron Gardner 1937P66
|--G. (G.) tridesmia (Berry 1941) [=Clathurella (G.) tridesmia]P66
|--G. (G.) triniada Mansfield 1925P66
|--G. (G.) typhon Gardner 1937P66
|--G. (G.) typhonoides Fargo 1953P66
|--G. (G.) watsoni Dall 1890P66
|--G. (G.) xeston Gardner 1937P66
`--G. (G.) zoster Gardner 1948P66
Glyphostoma (Glyphostoma) ‘dalli’ (Bose & Toula 1910) [=Pleurotoma (Clathurella) dalli nec P. dalli Verrill & Smith 1882 nec Bush 1893 nec P. (Borsonia) dalli Arnold 1903]P66
*Type species of generic name indicated
References
[BC01] Boyko, C. B., & J. R. Cordeiro. 2001. Catalog of Recent type specimens in the Division of Invertebrate Zoology, American Museum of Natural History. V. Mollusca, part 2 (class Gastropoda [exclusive of Opisthobranchia and Pulmonata], with supplements to Gastropoda [Opisthobranchia], and Bivalvia). Bulletin of the American Museum of Natural History 262: 1–170.
[P66] Powell, A. W. B. 1966. The molluscan families Speightiidae and Turridae: an evaluation of the valid taxa, both Recent and fossil, with lists of characteristic species. Bulletin of the Auckland Institute and Museum 5: 1–184, pls 1–23.