Speightiidae
Encyclopedia
Speightiidae is an extinct taxonomic family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of sea snail
Snail
Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s, marine gastropod mollusks.
This family is not assigned to a superfamily. It has been traditionally classified near the family Turridae
Turridae
Turridae, , is a large taxonomic family of predatory sea snails, marine gastropod mollusks, that vary in size from minute to moderately large. With more than 4,000 species, the Turridae is the largest mollusk family and group of marine caenogastropods...

. But in 1993 it has been shown that many if not all species from this family should fall under the family Fasciolariidae
Fasciolariidae
Fasciolariidae, common name the "tulip snails and spindle snails", is a family of small to large sea snails, marine gastropod mollusks in the superfamily Buccinoidea....

.
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