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Goniasma lasallense

Gastropoda - Goniasmatidae

Murchisonia lasallensis was named by Worthen (1890). It is not a trace fossil.

It was recombined as Worthenia lasallensis by Girty (1903); it was recombined as Goniospira lasallensis by Girty (1915); it was recombined as Goniasma lasallensis by Tomlin (1930), Girty (1939), Knight (1941), Hoare (1961), Sturgeon (1964), Yochelson and Saunders (1967), Kues (1985), Kues (1991), Kues (1996), Kues and Batten (2001) and Bandel (2002); it was recombined as Stegocoelia lasallensis by Licharev (1975); it was recombined as Stegocoelia (Goniasma) lasallensis by Batten (1995); it was recombined as Goniasma lasallense by Blodgett and Johnson (1992) and Wagner (2017).

Synonymy list
YearName and author
1890Murchisonia lasallensis Worthen pp. 141 - 142 figs. pl. 25 f. 7-7a
1903Worthenia lasallensis Girty p. 457
1915Goniospira lasallensis Girty p. 356
1930Goniasma lasallensis Tomlin p. 23
1939Goniasma lasallensis Girty pp. 27 - 31 figs. f. 15-19
1941Goniasma lasallensis Knight pp. 133 - 134 figs. pl. 42 f. 6a-e
1961Goniasma lasallensis Hoare pp. 162-163 figs. pl. 22 f. 19-20
1964Goniasma lasallensis Sturgeon pp. 217 - 218 figs. pl. 34 f. 20; pl. 36 f. 1
1967Goniasma lasallensis Yochelson and Saunders p. 90
1975Stegocoelia lasallensis Licharev p. 63 figs. pl. 9 f. 6-8
1985Goniasma lasallensis Kues p. 14 figs. f. 2M
1991Goniasma lasallensis Kues p. 228 fig. 3.14
1992Goniasma lasallense Blodgett and Johnson p. 125
1995Stegocoelia (Goniasma) lasallensis Batten p. 22 fig. 31
1996Goniasma lasallensis Kues p. 182 figs. f 7.19
2001Goniasma lasallensis Kues and Batten pp. 47 - 48 figs. f. 9.2-9.3
2002Goniasma lasallensis Bandel p. 97 figs. f. 22-25
2017Goniasma lasallense Wagner p. 5121

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EubilateriaAx 1987
classGastropodaCuvier 1797
subclassProsobranchiaMilne-Edwards 1848
superorderCaenogastropodaCox 1959
superfamilyOrthonematoideaNützel and Bandel 2000
subfamilyGoniasmatinae(Nützel and Bandel 2000)
genusGoniasmaTomlin 1930

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.

R. L. Batten 1995High-spired, turreted shells with wide selenizone located immediately below sharply formed periphery. Sutures deep, narrowly defined, sharply depressed. Upper whorl surface evenly concave and ornamented only by growth lines. Periphery marked by shoulder at midpoint of whorl profile and is most conspicuous feature of shell. Selenizone concave with periphery serving as upper margin. Lower margin a spiral cord much weaker than upper margin. Alveozone concave and sloping downward. Lower margin marked by a spiral cord about equally well-developed as lower selenizone margin. Whorls embrace on lower alveozone margin. No collabral ornament. Base is absent.