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Pectunculus siouxensis
Taxonomy
Pectunculus siouxensis was named by Hall and Meek (1855). It is not extant. 
  Sister species lacking formal opinion data
  
Synonymy list
| Year | Name and author | 
|---|---|
| 1855 | Pectunculus siouxensis Hall and Meek p. 384 figs. PL 1. Fig 12 | 
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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.
 †Pectunculus siouxensis Hall and Meek 1855
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Diagnosis
No diagnoses are available