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Acirsa (Acirsa) vaquerosensis
Taxonomy
Acirsa (Acirsa) vaquerosensis was named by Durham (1937). Its type specimen is CAS 7011 and is a 3D body fossil.
Sister species lacking formal opinion data
A. cerithiformis, A. corrugata, A. elatior, A. heyseana, A. kelseyi, A. lanceolata, A. meeki, A. ochotensis, A. solumcostata, A. subplicata, A. erasa, A. pervaricosa, A. striatula, A. corrugata, A. duvergieri, A. lanceolata, A. ofunatoensis, A. oscari, A. parvicostata, A. texana, A. leunisii, A. mioplicatula
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Acirsa (Acirsa) vaquerosensis Durham p. 511 figs. Plate 56, figure 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.
†Acirsa (Acirsa) vaquerosensis Durham 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. W. Durham 1937 | Shell of medium size, tall, heavy; whorls slightly convex; sutures shallow; whorls about 10 (nuclear whorls missing); ornamented by about 24 low, irregular, usually inconspicuous axial ribs with interspaces of about the same width; in younger whorls occasional ribs, approximately 180 degrees apart, are rather heavy, probably representing· a resting stage during growth; between axial ribs fine incremental lines, variously spaced; spiral ornamentation of about 24 spiral threads of varying prominence and interspaces; just above basal keel of body whorl are four approximately equal spirals with interspaces not quite as wide; in addition there are four more primary spirals, of which the lowest is about one and one-half times as wide as the preceding primary spiral and has a fine secondary spiral thread in the interspace, the last of these four being about equal in prominence to the last of the preceding four; interspaces between first three of the last four primary spirals about as wide as the spirals, but twice as wide between the last two; a fine secondary occurs in each interspace between these primary spirals; about 12 more or less prominent primaries above those already described, with interspaces of approximately equal width, with very faint traces of fine secondaries in their interspaces; above the last 12 and just below suture are about four fine, hardly discernible spirals; a moderately prominent basal keel on part of body whorl, with about 20 fine spirals of varying widths below it, interspaces not as wide as spirals; aperture markedly ovate; outer lip sharp. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Beu et al. 1990 | |||||
Collections
No collection or age range data are available