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Athabaskia
Taxonomy
Athabaskia was named by Raymond (1928) [Sepkoski's age data: Cm lMid Cm mMid-u Sepkoski's reference number: 80]. It is not extant.
It was synonymized subjectively with Clavaspidella by Resser (1935).
It was assigned to Ptarmiganidae by Lochman (1952); to Corynexochida by Sepkoski (2002); and to Dolichometopidae by Palmer (1954) and Jell and Adrain (2002).
It was synonymized subjectively with Clavaspidella by Resser (1935).
It was assigned to Ptarmiganidae by Lochman (1952); to Corynexochida by Sepkoski (2002); and to Dolichometopidae by Palmer (1954) and Jell and Adrain (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1928 | Athabaskia Raymond |
| 1952 | Athabaskia Lochman p. 128 |
| 1954 | Athabaskia Palmer p. 66 |
| 2002 | Athabaskia Jell and Adrain p. 345 |
| 2002 | Athabaskia Sepkoski |
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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. †Athabaskia Raymond 1928
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†Athabaskia anax Walcott 1916
†Athabaskia bela Walcott 1916
†Athabaskia glacialis Raymond 1928
†Athabaskia howelli Walcott 1886
†Athabaskia minor Resser 1938
†Athabaskia ostheimeri Raymond 1928
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Palmer 1954 | Cephalon subsemicircular in outline; posterior margin straight; distinct genal spines extend backward from posterolateral corners. Cranidium with glabella extending to or nearly to anterior margin, straight sided behind next to last glabellar furrow, distinctly expanded anterior to this furrow; anterolat- eral corners strongly rounded; anterior margin broadly rounded. Three pairs of straight glabellar furrows visible; posterior pair extended backward at a sharp angle with dorsal furrow; middle pair approximately perpen- dicular to dorsal furrow; anterior pair extended forward from dorsal furrow. Occipital furrow distinct, deepest at sides. Occipital ring flat, unspined. Width of fixed cheeks about one-third width of glabella. Palpebral lobes long, distinct; anterior ends nearly touching dorsal furrow in front of first distinct glabellar furrow. Pos- terior limbs longer than occipital ring, narrow.
Thorax of 7 or 8 segments. Axial lobe narrower than pleural lobes. Pleural lobes of each segment subequally divided by broad pleural furrow and extended distally into a short pointed spine. Pygidium subsemicircular in outline, nearly as large as cephalon. Axial lobe prominent, furrowed, about as wide as pleural platforms, not extended onto concave border. Pleural lobes with pleural furrows and inter- pleural grooves about equally spaced, usually extended onto border. |