Untitled

Opisthonematidae Yu, 1976 [December]
Reference: [Yu Wen, in Lu et al.] Memoirs of
Nanjing Institute of Geology and Palaeontology,
7: 40
Type genus: tOpisthonema Yu, 1 974
Remarks: Invalid: type genus a junior homonym
of Opisthonema Gill, 1862 [Pisces].
Opisthophthalmidae Jousseaume, 1894
Reference: Mémoires de la Société Zoologique
de France,! -.2^2
Remarks: Family containing the genus Trun-
catella (see Opisthophthalma in higher category
list). Not available as a family-group
name: not based on a genus.
Opisthotremata Wenz, 1923 [20 March]
Reference: Fossilum catalogus, I, Pars 17: 206
Remarks: Established as a superfamily, contain-
ing the family Onchidiidae. Not available as a
family-group name (not based on a genus).
Orbacea Lamarck, 1809
Reference: Philosophie zoologique, 1: 320
Remarks: Original spelling "les Orbacées"
(vernacular). Latinized by Herrmannsen
(1847 [in 1846-1852]: 154). Established as
a family (including the genera Cyclostoma,
Planorbis, Vivípara, and Ampullaha), and not
available as such (not based on a genus).
Orbitestellidae Iredale, 1917 [10 November]
Reference: Proceedings of the Malacological
Society of London, 12(6): 327
Type genus: Orbitestella Iredale, 1917
Orculinae Pilsbry, 1918 [24 April]
Reference: Manual of Conchology, ser. 2,
24(96): X
Type genus: Orcula Held, 1837
Remarks: -idae, Steenberg (1925: 201);
-oidea,Schileyko(1984:5).
Orectospirinae Habe, 1955 [May]
Reference: Minutes. Conchological Club of
Southern California, 147: 4
Type genus: Orectospira Dall, 1925
Remarks: -idae. Habe (1 961 : 24).
Oreohelicinae Pilsbry, 1939 [6 December]
Reference: Land Mollusca of North America
(north of Mexico), \. 1(1): 412
Type genus: Oreo/?e//x Pilsbry, 1904
Remarks: -idae, same reference.
Orientaliidae Radoman, 1973 [31 May]
Reference: Prirodnjacki Muzej Beogradu.
Posebna Izdanja, 32: 6
NOMENCLÁTOR OF GASTROPOD FAMILIES 121
Type genus: Orientalia Radoman, 1972
Remarks: -inae, same reference. Invalid: type
genus a junior homonym of Orientalia Byko-
va, 1947 [Foraminifera]. See Orientalinidae.
Orientalinidae Radoman, 1978 [16 August]
Reference: Archiv für Molluskenkunde, 109(1-
3):27
Type genus: Orientalina Radoman, 1978
Remarks: -inae, same reference. Norn. nov.
pro Orientalidae, invalid because its type
genus is a junior homonym. However, Orientalina
is itself a junior homonym of Orientalina
Kolosnitsyna, 1973 [Crustacea], which
makes Orientalinidae invalid.
Oriostomatidae Koken, 1896
Reference: Jahrbuch der Kaiserlich-Königlichen
Geologischen Reichsanstalt, 46(1 ): 47, 106
Type genus: -tOrlostoma Munier-Chalmas,
1876
Remarks; Original spelling Horiostomidae,
based on Horiostoma P. Fischer, 1885, an
unjustified emendation of Orlostoma. -oidea
[as -acea], Cox & Knight (1960: 263).
Orthalicidae Albers, 1860
Reference: Die Heliceen, ed. 2: 209
Type genus: Orthalicus Beck, 1837
Remarks: Original spelling Orthalicea. -inae.
Carpenter (1864: 672); -oidea [as "SuperF.
Orthalicidae"], H. B. Baker (1956a: 133).
Orthoconcha Fol, 1875
Reference: Archives de Zoologie Expérimentale
et Générale, 4: 1 76
Remarks: See higher category list.
Orthogibbidae Germain, 1921 [March]
Reference: Faune malacologique terrestre et
fluviatile des iles Mascareignes: 41 5, 461
Type genus: Ori/7og/bbas Germain, 1919
Remarks: -inae, Bouchet, herein [in place of
Gibbinae and Gonidominae over which it has
priority].
Orthomitrinae L. Bellardi, 1887 [before 18
April]
Reference: / Molluschi del terreni terziarii del
Piemonte e delta Liguria, parte V: 3
Remarks: Not available: not based on a genus.
Orthonematidae Nütze! & Bande!, 2000 [September]
Reference: Neues Jahrbuch für Geologie und
Paläontologie. Monatshefte, 2000(9): 560-
561
Type genus: -\Orthonema Meek & Worthen, 1 862