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Lichakephalidae
Taxonomy
Lichakephalidae was named by Tripp (1957). It is not extant.
It was assigned to Lichoidea by Pollitt et al. (2005); and to Lichida by Whittington et al. (1997), Adrain (2011).
It was assigned to Lichoidea by Pollitt et al. (2005); and to Lichida by Whittington et al. (1997), Adrain (2011).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Eoacidaspididae Poletaeva |
| 1957 | Lichakephalidae Tripp |
| 1997 | Lichakephalidae Whittington et al. p. 299 |
| 2005 | Lichakephalidae Pollitt et al. p. 238 |
| 2011 | Lichakephalidae Adrain p. 105 |
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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.
Fm. †Lichakephalidae Tripp 1957
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G. †Acidaspides Lermontova 1951
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†Acidaspides entis Khramova 1977
†Acidaspides lermontovae Tchernysheva 1953
†Acidaspides precurrens Lermontova 1951
G. †Archikainella Liu 1982
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†Archikainella vomerinus Liu 1982
Invalid names: Chencunia Qiu 1984 [synonym], Metaacidaspis Qiu 1984 [synonym]
G. †Bestjubella Ivshin 1955
G. †Colossaspis Zhang 1983
G. †Eoacidaspis Poletaeva 1956
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†Eoacidaspis amplicauda Lazarenko 1968
†Eoacidaspis salairica Poletaeva 1956
G. †Lichakephalina Antsygin 1973
Invalid names: Eoacidaspididae Poletaeva 1957 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. R. Pollitt et al. 2005 | Moderately long preglabellar field (character 1). Longitudinal furrow can be effaced but, if not, is not continuous with S0 (character 2). S1 conjoins to S2 to circumscribe the lobe L2, may be effaced (character 3). Median glabella does not overhang the anterior border (character 7). Glabella lobe is L2 (character 10). Sagittal convexity of cranidium is weak (character 20). Path of anterior section of facial suture is strongly divergent (except in Acidaspidella, where it is subparallel: character 21). No interpleural furrows are present (character 35). All taxa have more than one complete pygidial inter-ring furrow (character 39). |