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Borissjakoceras
Taxonomy
Borissiakoceras was named by Arkhangel'skii (1916) [Sepkoski's age data: K Albi-u K Turo-l].
It was corrected as Borissjakoceras by Morrow (1935) and Bohach and Frampton (2015).
It was assigned to Cephalopoda by Morrow (1935); to Ammonoidea by Sepkoski (2002); and to Binneyitidae by Cooper and Kennedy (1979), Kennedy and Cobban (1990) and Bohach and Frampton (2015).
It was corrected as Borissjakoceras by Morrow (1935) and Bohach and Frampton (2015).
It was assigned to Cephalopoda by Morrow (1935); to Ammonoidea by Sepkoski (2002); and to Binneyitidae by Cooper and Kennedy (1979), Kennedy and Cobban (1990) and Bohach and Frampton (2015).
Synonymy list
| Year | Name and author |
|---|---|
| 1916 | Borissiakoceras Arkhangel'skii |
| 1935 | Borissjakoceras Morrow |
| 1979 | Borissiakoceras Cooper and Kennedy p. 296 |
| 1990 | Borissiakoceras Kennedy and Cobban p. 385 |
| 2002 | Borissiakoceras Sepkoski |
| 2015 | Borissjakoceras Bohach and Frampton p. 61 |
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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. †Borissjakoceras Arkhangel'skii 1916
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†Borissiakoceras ashurkoffae Cobban and Gryc 1961
†Borissiakoceras inconstans Cobban and Gryc 1961
†Borissiakoceras orbiculatum Stephenson 1955
†Borissiakoceras reymenti Brunnschweiler 1959
†Borissjakoceras rosenkrantzi Birkelund 1965
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. L. Bohach and E. K. Frampton 2015 | Borissjakoceras is a small, compressed ammonite with flat flanks. Like other members of the Binneyitidae, it has a nacreous shell with metallic lustre, weak ornamentation, and simple sutures with bifid to trifid lobes and a second lateral saddle that projects beyond the first lateral saddle (Wright et al. 1996). |