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Mastigospira alata

Gastropoda - Euomphalina - Euomphalidae

Taxonomy
Hyolithes alatus was named by Whiteaves (1892) [Syntypes only.]. Its type specimen is GSC 4099a, a shell, and it is a 3D body fossil. It is the type species of Mastigospira.

It was recombined as Mastigospira alata by La Rocque (1949), McCammon (1960), McLaren and Norris (1962), Blodgett (1992) and Wagner (2023).

Synonymy list
YearName and author
1892Hyolithes alatus Whiteaves pp. 342 - 343 figs. pl. 46 f. 2-4
1911Hyolithes alatus Cleland pp. 18, 131 - 132 figs. pl. 26 f. 9-10
1949Mastigospira alata La Rocque pp. 116 – 118 figs. pl. 1 f. 1, 3-4
1960Mastigospira alata McCammon p. 71 figs. pl. 12 f. 7
1962Mastigospira alata McLaren and Norris figs. pl. 10 f. 9
1992Mastigospira alata Blodgett p. 141
2023Mastigospira alata Wagner p. 950

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classGastropoda
RankNameAuthor
subclassEogastropoda
orderEuomphalina
superfamilyEuomphaloidea()
familyEuomphalidae
subfamilyOdontomariinae
genusMastigospira
speciesalata()

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.

Mastigospira alata Whiteaves 1892
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Diagnosis
ReferenceDiagnosis
A. La Rocque 1949Shell tusk-shaped, irregularly but only slightly curved, outer cross section triangular, inner wall of shell conical. The three sides of the pyramidal exterior of the shell prolonged into thin, lamellar processes about 20 mm. wide; areas between the processes gently concave. Lip flaring widely at the base, less so at the upper angle; base of lip with a deep but gently rounded notch. Basal wings prolonged forward into spinelike processes; upper wing ending just above the beginning of the basal notch. Ornamentation of close, fine, crowded lines prolonged on the wings, where they curve forward near the base of the wing and backward near its outer edge. Apical part of shell terminated abruptly in a convex surface suggesting the presence of a septum or plug.