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Ilsanella
Taxonomy
Ilsanella was named by Missarzhevsky (1981) [Sepkoski's age data: Cm Tomm-l Cm Atda-u Sepkoski's reference number: 522,885,1006]. Its type is Helcionella atdabanica.
It was assigned to Cyrtonellida by Bengtson (1992); to Mollusca by Sepkoski (2002); and to Helcionellidae by Missarzhevsky (1989), Wang (1994), Parkhaev (2002) and Jacquet and Brock (2016).
It was assigned to Cyrtonellida by Bengtson (1992); to Mollusca by Sepkoski (2002); and to Helcionellidae by Missarzhevsky (1989), Wang (1994), Parkhaev (2002) and Jacquet and Brock (2016).
Species
Synonyms
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Synonymy list
Year | Name and author |
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1969 | Ginella Rozanov et al. pp. 164-165 |
1976 | Ginella Runnegar and Jell p. 116 |
1976 | Parmophorella Runnegar and Jell p. 117 |
1981 | Ilsanella Missarzhevsky p. 123 |
1989 | Ilsanella Missarzhevsky p. 171 |
1992 | Ilsanella Bengtson p. 1027 |
1994 | Ilsanella Wang p. 11 |
2002 | Ilsanella Parkhaev p. 34 |
2002 | Ilsanella Sepkoski |
2002 | Parmophorella Sepkoski |
2016 | Ilsanella Jacquet and Brock |
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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. †Ilsanella Missarzhevsky 1981
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†Ilsanella applanata Parkhaev 2001
†Ilsanella atdabanica Rozanov and Missarzhevsky 1966
†Ilsanella coreanicum Kobayashi 1958
†Ilsanella critica Barskova 1987
†Ilsanella diversa Barskova 1988
†Ilsanella enallaxa Jacquet and Brock 2016
†Ilsanella galinae Barskova 1988
†Ilsanella historica Barskova 1987
†Ilsanella orectus Jiang 1982
†Ilsanella paupera Billings 1872
†Ilsanella plana Barskova 1987
†Ilsanella reticulata Zhou and Xiao 1984
†Ilsanella rozanovi Wang 1994
†Ilsanella savitskii Rozanov et al. 1969
†Ilsanella simplex Chen and Zhang 1980
†Ilsanella yorkensis Parkhaev 2001
Invalid names: Ginella Rozanov et al. 1969 [replaced], Parmophorella [synonym]
Diagnosis
Reference | Diagnosis | |
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S. M. Jacquet and G. A. Brock 2016 | Large cyrtoconic univalve, high to tall profile (H:L ratio ≥0.75 to N1), moderately to slowly expanding, elliptical to sub-rectangular apertural outline, with eccentric apex that rarely projects beyond the sub-apical margin. Adult specimens greater than 10 mm in length. Supra-apical surface evenly convex, sub-apical surface concave directly under the apex, but minimal concavity or almost straight adapically to the apertural margin. Apertural plane straight in lateral view. External ornament consists of wide, uniformly rounded concentric
rugae. |