Basic info Taxonomic history Classification Included Taxa
Morphology Ecology and taphonomy External Literature Search Age range and collections

Archinacella instabilis

Tergomya - Archinacellida - Archinacellidae

Taxonomy
Metoptoma instabilis was named by Billings (1865). It is not extant.

It was recombined as Archinacella instabilis by Ulrich and Scofield (1897), Rohr et al. (2008) and Wagner (2023).

Sister species lacking formal opinion data
A. visconsinensis

Synonymy list
YearName and author
1865Metoptoma instabilis Billings p. 251
1897Archinacella instabilis Ulrich and Scofield pp. 829, 836
2008Archinacella instabilis Rohr et al. pp. 95 - 98 figs. pl. 1 f. 1-17; pl. 2 f. 1-5; txt. f. 3
2023Archinacella instabilis Wagner p. 3937

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classTergomya
orderArchinacellida()
superfamilyArchinacelloidea()
familyArchinacellidae
genusArchinacella
speciesinstabilis()

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.

†Archinacella instabilis Billings 1865
show all | hide all
Diagnosis
ReferenceDiagnosis
D. M. Rohr et al. 2008Cap=shaped, symmetrical to nearly symmetrical, subovate shell; rapidly expanding from apex through one quarter to one half revolution; dorsum convexly arched, apex overhangs the margin on some specimens; apertural margin planar; surface smooth or with growth stoppages on some specimens; repair of broken shell evident on one specimen. Continuous interior muscle scar present around apex, no accessory muscle scars observed.
Measurements
partNmeanminimummaximummedians.d.
shell height107.845.0011.68.051.93

Locomotion: actively mobileo
Life habit: epifaunalo
Diet: grazero
Vision: blindc
Created: 2009-04-21 11:50:19
Modified: 2009-04-21 13:50:19
Source: o = order, c = class
Reference: Hendy et al. 2009

Age range: Whiterockian or 470.00000 to 457.30000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Whiterockian470.0 - 457.3Canada (Newfoundland and Labrador) Archinacella instabilis (10279)