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Vesperispira humboldtiana
Taxonomy
Vesperispira humboldtiana was named by Yancey et al. (2000). Its type specimen is UCMP 154046 and is a 3D body fossil. Its type locality is UCMP 11158, Buckaroo Canyon, which is in an Asselian/Sakmarian slope limestone in Nevada. It is the type species of Vesperispira.
Synonymy list
| Year | Name and author |
|---|---|
| 2000 | Vesperispira humboldtiana Yancey et al. p. 743 fig. 2 |
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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.
†Vesperispira humboldtiana Yancey et al. 2000
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. E. Yancey et al. 2000 | Vesperispirids with strong peripheral ridge and collabral raised lamellae, which remain raised and distinct even where crossing over peripheral ridge.
Small (range 1–7 mm in height and diameter), biconic shell, with numerous prosocline collabral growth lamellae extending down to umbilicus on base of shell; a sharp, flaring peripheral ridge on each whorl; whorl margins and profile nearly straight-sided above and below peripheral ridge; raised spiral ridges on basal surface of whorl; a deep, wide, open umbilicus; a small sinus in shell aperture coincident with peripheral ridge; growth lines follow lamellae (Fig. 3). The spire has flattened apex, generated by nearly planispiral coiling condition for one or two whorls; subsequent shell has broad conispiral form with an apical angle of about 90 degrees; larger shells contain four or five whorls, of which the three later whorls have typical profile of the adult shell; top of successive whorls attach to preceding whorls just beneath the peripheral ridge, generating a straight-sided profile for spire, interrupted by the slightly projecting peripheral ridge; angle of periphery between spire surface and umbonal slope about 70 degrees. Sculpture/ornamentation.. Ornamentation consists of regularly spaced prosocline collabral growth lamellae formed along outer lip of the shell, above and below peripheral ridge; lamellae occur in densities of four to five per mm on whorl diameters of 2–3 mm and densities of three per mm on whorl diameters of 3–5 mm; lamellae sharp and have even outer margins, rising nearly vertically a short distance above whorl surface, except on basal surface of whorl where lamellae have irregular outer margins where they cross outer two raised spiral ridges, developing a subdued wavy frill condition; basal surface of whorl contains two or three sharp spiral ridges, narrow, sharp crested—like an inverted V, and an additional broad, flat-topped spiral stripe bordering the umbilicus; innermost of sharp spiral ridges, located at middle of basal profile, is highest; inner spiral stripe, bordering umbilicus, thickens shell so wall is double normal shell thickness; lamellae are absent or reduced to simple growth lines over inner spiral band. Aperture quadrate, oblique, strongly inclined to axis of coiling, with an interrupted peristome; outer lip thin, regularly flared outward into lamellae; lip runs nearly perpendicular from attachment point on preceding whorl and sweeps back into a horizontal orientation parallel to peripheral ridge at upper edge of sinus; peripheral ridge sharp angled, becoming flared out on some shells, forming a narrow sharp-edged shelf; shallow but narrow sinus present across peripheral ridge; aperture below peripheral ridge crosses over spiral ridges which consist of sharp inverted V-shaped deflections of shell, where shell is pushed outward; these bent-out parts of shell margin filled in with secondary shell material a short distance back of aperture; growth lines sharply raised where they cross mid spiral ridge on base of whorl, producing a slight sinus-like bend of growth lines on some specimens, but not a consistent feature; inner apertural margin on base of whorl thickened between inner spiral ridge and attachment line to previous whorl, with flat or slightly dimpled facet where it crosses inner spiral ridge. |
Measurements
No measurements are available
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| Source: f = family, o = order | |||||
| References: Hendy 2009, Bambach et al. 2007 | |||||
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Asselian - Sakmarian | USA (Nevada) | Vesperispira humboldtiana (type locality: 115412 115459) |