Crassispira pseudoprincipalis explained

Crassispira pseudoprincipalis is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and their allies.^[1]

There seems to be confusion about the accepted name of this species. According to the University of Tokyo, the accepted name is Crassispira pseudoprincipalis,^[2] while according to the World Register of Marine Species, the accepted name is Inquisitor pseudoprincipalis.^[3] Both rely on the basionym Pleurotoma (Drillia) pseudoprincipalis Yokoyama, 1920.

Description

The length of the shell attains 27.5 mm, its diameter 8.3 mm.

According to Makiyama (1927, p. 104), Japanese specimens of this species differ from Crassispira bataviana (Martin, 1895) in having a shorter siphonal canal. The same appears to be true of the Okinawan and Formosan specimens.

Distribution

Fossils have been found in Miocene in Japan and in Pliocene strata in Okinawa, Japan.

References

• Yokoyama, 1920. Tokyo Imp. Univ. Coll. Sci. Jour., v. 39, art. 6, p. 37,
• Yokoyama, 1926, Tokyo Imp. Univ. Fac. Sci. Jour., sec. 2, v. 1, pt. 9, p. 330pi. 1, fig. 21.
• Makiyama, 1927, Kyoto Imp. Univ. Coll. Sci. Mem., ser. B, v. 3, no. 1, art. 1, p. 104; 1931, ser. B, v. 7, no. 1, art. 1, p. 7
• Nomura, 1935, Tohoku Imp. Univ. Sci. Repts., 2d ser., v. 18, no. 2, p. 124, pi. 6, fig. 38.
• Hatai and Nisiyama, 1952, Tohoku Univ. Sci. Repts., 2d ser., spec. v. 3, p. 232

Notes and References

1. https://pubs.er.usgs.gov/publication/pp339 F.S. MacNeil (1960), Tertiary and Quaternary Gastropoda of Okinawa; Professional Paper 339; USGS
2. http://umdb.um.u-tokyo.ac.jp/DKoseibu/jp/Collection/detail.php?umutNo=20070 University of Tokyo: Crassispira pseudoprincipalis (Yokoyama, 1920)
3. MolluscaBase (2018). Inquisitor pseudoprincipalis (Yokoyama, 1920). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=761950 on 2018-10-16