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Helminthoida
Taxonomy
Helminthoida was named by Schafhautl (1851). Its type is Helminthoida irregularis.
It was assigned to Algae by Knowlton (1919); and to Ichnofossils by Hantzschel (1975).
It was assigned to Algae by Knowlton (1919); and to Ichnofossils by Hantzschel (1975).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1851 | Helminthoida Schafhautl |
| 1919 | Helminthoida Knowlton |
| 1975 | Helminthoida Hantzschel |
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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. †Helminthoida Schafhautl 1851
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†Helminthoida abnormis Ulrich 1904
†Helminthoida exacta Ulrich 1904
†Helminthoida irregularis Schafhaeutl 1851
†Helminthoida subcrassa Ulrich 1904
†Helminthoida vaga Ulrich 1904
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. Hantzschel 1975 | Meandering tunnel trails; meanders numerous, very regular, parallel and closely spaced, but may be irregular, not always parallel and not closely spaced; about 1 to 3 mm wide, max width of meanders about 1 cm and length 10 cm; regular meanders are type of the “guided meanders”; species of this “genus” exhibit much variability, thus Ksiazkiewicz introduced two “groups” and some “formae”. |
Measurements
No measurements are available
No ecological data are available