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Campbellospira missouriensis

Gastropoda - Murchisoniina - Gosseletinidae

Synonymy list
YearName and author
2009Campbellospira missouriensis Bandel pp. 16 - 17 figs. pl. 5 f. 63-65

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EubilateriaAx 1987
classGastropodaCuvier 1797

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.

K. Bandel 2009The shell from the Pennsylvanian Henrietta Shale of the St. Louis Outlier of Missouri has the protoconch of about 0.13 mm in width succeeded by 2.5 rounded whorls of the teleoconch with fine spiral ornament. The even low trochispiral coiling continues in the third whorl but ornament changes with short radial ribs added to the spirals on the apical whorl, a keel appears on the periphery and here a selenizone is found with indistinct regular growth increments. Its lower side is formed by a further keel below which the whorl is evenly rounded and continuous into the rounded base that has a narrow umbilicus into which the inner lip expands. The aperture is rounded with less curvature on the inner lip (pl. 5, figs. 63-65).

Only juvenile shells are represented of which the largest consists of 5 whorls, is 2 mm high and slightly less wide (1.5 mm in holotype). Ornament of the protoconch is not preserved and the early teleoconch has fine spiral ribs which become more distinct in the first whorl, amounting to about 6 in the visible part of the spire. The second whorl of the teleoconch has 7 visible spiral ribs and they have increased in strength and width. Within the third whorl the upper of the spiral ribs forms nodules which in continuation transform into short axial curving ribs. They end before reaching the spiral keel that indicated the apical edge of the selenizone that inserts here. It occupies the peripheral margin.

The early teleoconch has fine spiral ornament, consists of rounded whorls, with insertion of the slit within the third whorl. Alongside a corner is formed below which the selenizone has its position and axial folds appear, as in Sisenna. Yoo (1994) suggested that Cambellospira differs from other genera of the Eotomariidae by having a planktotrophic protoconch that in the type species C. conica Yoo, 1994 is interpreted to consist of two whorls. C. missouriensis has in the early teleoconch also growth intermissions in the end of the second whorl, as is the case in one of the specimens from Australia, but also after 2.3 whorls in a second and third individual. The existence of a larval shell can thus clearly be excluded.