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Elrathina
Taxonomy
Elrathina was named by Resser (1937) [Sepkoski's age data: Cm lMid Cm uMid-l Sepkoski's reference number: 81,379]. It is not extant.
It was synonymized subjectively with Ptychoparella by Jell and Adrain (2002).
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariida by Palmer and Halley (1979), Sepkoski (2002); to Arthropoda by Caron and Jackson (2008); and to Ptychopariacea by Geyer and Peel (2017).
It was synonymized subjectively with Ptychoparella by Jell and Adrain (2002).
It was assigned to Ptychopariina by Sundberg (1994); to Ptychopariida by Palmer and Halley (1979), Sepkoski (2002); to Arthropoda by Caron and Jackson (2008); and to Ptychopariacea by Geyer and Peel (2017).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Elrathina Resser |
| 1979 | Elrathina Palmer and Halley p. 103 |
| 1994 | Elrathina Sundberg p. 109 |
| 2002 | Elrathina Sepkoski |
| 2008 | Elrathina Caron and Jackson p. 226 |
| 2017 | Elrathina Geyer and Peel p. 268 |
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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. †Elrathina Resser 1937
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†Elrathina antiqua Palmer and Halley 1979
†Elrathina cordillerae Rominger 1887
†Elrathina marginalis Rasetti 1951
†Elrathina offula Resser 1939
†Elrathina parallela Rasetti 1951
†Elrathina wheelera Sundberg 1994
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. A. Sundberg 1994 | Small, micropygous Ptychopariida with subrectangular cranidium with convergent fa- cial sutures anterior of the palpebral lobes, glabella elevated above fixigena; parallel to slightly conver- gent, moderate depth axial furrows; shallow to ef- faced lateral glabellar furrows; strongly rounded frontal lobe; slightly downsloping, moderately wide fixigenae; narrow preglabellar field; convex, slightly to moderately curved, sagittally narrow, tapering anterior border; short palpebral lobes anterior of glabellar midlength. Free checks lack significant development of genal spines. Triangular pygidium. |