> as lemmas

1953 A. Seilacher in Neues Jahrb. Geol. u. Paläontol. 96 440 Die Bezeichnungen ‘Ichnogenus’ u. ‘Ichnospezies’ könnten leicht den Eindruck erwecken, zwischen diesen Begriffen u. der zoologischen Gattung u. Art bestünde eine bestimmte Korrelation.]

1956 S. Simpson in Q. Jrnl. Geol. Soc. 112 488 The study of trace-fossils requires the development of an appropriate system of classification and nomenclature. Seilacher..has ably supplied the theoretical foundations for such a system. His classification involves a hierarchy of categories of which the lowest is the ichnospecies, and the next the ichnogenus.

1962 Jrnl. Geol. (Chicago) 70 233/2 The ichnofauna of the Cretaceous and the Tertiary Flysch are so much alike that they are difficult to tell apart.

1964 A. Seilacher in Imbrie & Newell Approaches to Paleoecol. 301 Ichnofossils..are most abundant and best preserved in clastic series, particularly where sandy and shaly beds alternate.

1964 A. Seilacher in Imbrie & Newell Approaches to Paleoecol. 313 Most trace fossils are more or less restricted to one type of ichnofacies.

1972 Bull. Zool. Nomencl. 29 137 The following discussion originates from problems related with the naming of ichnotaxa in palaeontology.

1973 Canad. Jrnl. Earth Sci. 10 464/1 We consider that there should be just two basic units—the ichnogenus and the ichnospecies, equivalent in scope to the ‘form genus’ and ‘form species’ of the botanical ‘Code’.

1984 Jrnl. Paleontol. 58 514/2 Three ichnospecies of Ancorichnus currently are recognized, based upon differences in fabrication of menisci.

1984 Science 25 May 873/3 Chondrites represents the latest and therefore deepest of all the ichnogenera in the deep-sea trace fossil association to be emplaced in the sediment.

1989 Jrnl. Paleontol. 63 8/1 The Carolina slate belt ichnofossil assemblage from south-central North Carolina is composed of unornamented traces that do not exhibit complex patterns.