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Igorella
Taxonomy
Igorella was named by Rozanov et al. (1969) [Missarzhevsky in Rozanov et al. 1969; Sepkoski's age data: V N-Da-u Cm Atda-u Sepkoski's reference number: 1006,1030]. Its type is Igorella ungulata.
It was assigned to Cyrtonellida by Bengtson (1992); to Mollusca by Sepkoski (2002); to Helcionellidae by Runnegar and Jell (1976), Missarzhevsky (1989), Wang (1994), Feng et al. (2000) and Parkhaev (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
It was assigned to Cyrtonellida by Bengtson (1992); to Mollusca by Sepkoski (2002); to Helcionellidae by Runnegar and Jell (1976), Missarzhevsky (1989), Wang (1994), Feng et al. (2000) and Parkhaev (2002); and to Helcionellinae by Parkhaev and Demidenko (2010).
Species
Synonyms
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Synonymy list
Year | Name and author |
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1969 | Igorella Rozanov et al. pp. 166-167 |
1976 | Igorella Runnegar and Jell p. 117 |
1979 | Maidipingoconus Yü |
1981 | Songlinella Chen et al. |
1981 | Shabaktiella Missarzhevsky p. 50 |
1981 | Chabaktiella Missarzhevsky and Mambetov p. 50 |
1989 | Igorellina Missarzhevsky |
1989 | Igorella Missarzhevsky p. 172 |
1989 | Igorellina Missarzhevsky p. 175 |
1989 | Chabaktiella Missarzhevsky p. 177 |
1992 | Igorella Bengtson p. 1027 |
1994 | Dianella Wang |
1994 | Igorella Wang p. 12 |
1994 | Dianella Wang p. 13 |
1998 | Bemellina Vassiljeva p. 77 |
1998 | Compressoconus Vassiljeva p. 79 |
2000 | Igorella Feng et al. p. 373 |
2002 | Igorella Parkhaev p. 34 |
2002 | Igorellina Parkhaev p. 34 |
2002 | Chabaktiella Parkhaev p. 35 |
2002 | Dianella Sepkoski |
2002 | Igorella Sepkoski |
2002 | Igorellina Sepkoski |
2002 | Maidipingoconus Sepkoski |
2002 | Shabaktiella Sepkoski |
2010 | Igorella Parkhaev and Demidenko p. 1028 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Igorella Rozanov et al. 1969
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†Igorella cyrtoliformis Yü 1979
†Igorella durara Kruse 1991
†Igorella hamata Yü 1979
†Igorella iacobinica Geyer 1986
†Igorella lata Chen et al. 1981
†Igorella minuta Feng et al. 2000
†Igorella monstrosa Rozanov et al. 1969
†Igorella orientalis Chen et al. 1981
†Igorella shabaktiensis Missarzhevsky and Mambetov 1981
†Igorella talassica Missarzhevsky and Mambetov 1981
†Igorella ungulata Rozanov et al. 1969
†Igorella xilingensis Chen et al. 1981
†Igorella xundianensis Wang 1994
Invalid names: Bemellina Vassiljeva 1998 [synonym], Chabaktiella Missarzhevsky and Mambetov 1981 [synonym], Compressoconus Vassiljeva 1998 [synonym], Dianella Wang 1994 [synonym], Igorellina Missarzhevsky 1989 [synonym], Maidipingoconus Yü 1979 [synonym], Songlinella Chen et al. 1981 [synonym]
Diagnosis
Reference | Diagnosis | |
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P. Y. Parkhaev and Y. Demidenko 2010 | "Shell cap-shaped, high, considerably compressed laterally. Apex inclined and displaced posteriorly, significantly projecting over posterior apertural margin. Anterior field convex, posterior field concave and relatively long. Aperture oval or elliptical, simple, without sinuses or flaring. Ornamentation represented by concentric folds or ribs developed to different extent, rarely radial ribs or striation can be present." |