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Xancidae Pilsbry, 1922 [4 January]
Reference: Proceedings of the Academy of
Natural Sciences ofPhiladelpiiia, 73: 342
Type genus: Xancus Röding, 1798
Remarks: Established as substitute name for
Turbinellidae, based on Turbinella Lamarck,
1799, treated by Pilsbry as a synonym of
Xancus. Placed on the Official Index by Opin-
ion 489 (1957: 158), but attributed in error
to Woodring (1 928: 250). -inae, Abbott (1 954:
244).
Xanthomelontidae Iredale, 1 937 [30 September]
Reference: The South Australian Naturalist,
18(2): 40
Type genus: Xanthomelon Martens, 1860
Remarks: -inae, Schileyko (2003 [in 1998-
2003]: 1574).
Xanthonychidae Strebel & Pfeffer, 1879 [November]
Reference: Beitrag zur Kenntniss der Fauna
mexicanischer Land- und Süsswasser Conchylien,
4: 25
Type genus: Xanthonyx Crosse & P. Fischer,
1867
Remarks: Original spelling Xanthonycidae.
-inae. Zilch (1960 [in 1959-1960]: 649).
Xenophoridae Troschel, 1852 (1840)
Reference: Archiv für Naturgeschichte, 18(2):
280
Type genus: Xenophora Fischer von Waldheim,
1807
Remarks: Original spelling (family) Xenophora-
cea. -oidea [as -acea], Korobkov (1955: 240).
Placed on the Official List by Opinion 715
(1964: 417), but credited in error to Philippi
(1853: 185). Although Troschel did not men-
tion Phorus and Phoridae when he established
Xenophoridae, Xenophora Fischer von Waldheim,
1807, is a senior synonym of Phorus
Montfort, 1810; Xenophoridae is in prevailing
usage and, under Art. 40.2, it must be conserved
and takes the precedence of Phoridae.
Xerariontales Roth, 1996 [2 January]
Reference: The Veliger, 39(1): 34, 41
Type genus: Xerarionta Pilsbry, 1913
Remarks: Roth established the name Xerariontales
in a phylogenetic classification rejecting
formal categorical ranks; he
suggested that it could be considered equiv-
NOMENCLÁTOR OF GASTROPOD FAMILIES 185
alent to Xerariontini by a "hypothetical sys-
tematist concerned with expressing [his]
results within the Linnaean hierarchy".
Xerophilidae Mörch, 1864
Reference: Videnskabelige Meddelelser fra
den Naturhistorisk Forening i Kjöbenhavn,
17-22 (for 1863): 281
Type genus: Xerophila Held, 1837
Remarks: Type genus not mentionned, but
infered to be Xerophila. -inae, Kobelt
(1 904: 67, 1 32). Invalid: type genus placed
on the Official Index by Opinion 431 (1956:
351).
Xestinae Gude & B. B. Woodward, 1921 [24
October]
Reference: Proceedings of the Malacological
Society of London, 14(5-6): 185
Type genus: XesteAlbers, 1850
Remarks: -idae, Iredale (1941b: 67).
Xylodisculidae Waren, 1992 [25 February]
Reference: Bollettino Malacologico, 27(10-
12): 180
Type genus: Xylodiscula Marshall, 1988
Yangtzespirinae Yu, 1984 [July?]
Reference: [Yu Wen] Developments in Geoscience
[Contribution to 27th International
Geological Congress, 1984, Moscow]: 28
Type genus: -fYangtzespiraYu, 1979
Remarks: -idae, Yu (1987: 208).
Yetinae Gray, 1847 [November]
Reference: Proceedings of the Zoological
Society of London, 15: 141
Type genus: Yeius Bowdich, 1822
Remarks: Original spelling Yetina. See also Cym-
biinae.
Yochelcionellidae Runnegar& Jell, 1976
Reference: /\/c/?er/nga, 1(2): 129
Type genus: -\Yochelcionella Runnegar & Rojeta,
1974
Remarks: Again declared new by Golikov &
Starobogatov (1989: 70). -oidea, Parkhaev
(2001:166).
Yunqueinae Schileyko, 1998 [November]
Reference: Treatise on Recent terrestrial pulmonale
molluscs. Part 2: 254
Type genus: Yunquea H. B. Baker, 1940
Remarks: Not available (no diagnosis) from
H. B. Baker (1961: 166); nor from Franc
(1968b: 592, as Yunqueneinae).
Zaggleinae Webb, 1959 [14 February]
Reference: Gastropodia, 1(3): 22
Type genus: Zacoleus Pilsbry, 1903