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Angulatergum moorei
Taxonomy
Stramentum moorei was named by Hattin (1977). Its type specimen is KUS 111588, an other, and it is a 3D body fossil. Its type locality is Luray-Bunker Hill Road, which is in a Cenomanian marine chalk in the Greenhorn Formation of Kansas. It is the type species of Stramentum (Angulatergum).
It was recombined as Stramentum (Angulatergum) moorei by Hauschke (1994); it was recombined as Angulatergum moorei by Gale (2016).
It was recombined as Stramentum (Angulatergum) moorei by Hauschke (1994); it was recombined as Angulatergum moorei by Gale (2016).
Synonymy list
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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.
†Angulatergum moorei Hattin 1977
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Diagnosis
Reference | Diagnosis | |
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Hattin 1977 | Capitulum and peduncle typical
for family, comprising 10 plates and 8 columns, respectively. Capitulum with broadly convex occludent margin. Scutum trapeziform with upper lateral margin and rostral part of occludent margin nonparallel, meeting basal margins at obtuse and acute angles, respectively; scutal umbo not coincident with angulation of occludent margin, lies from oneninth to one-fourth the distance from apex to rostral angle-the latter in larger specimens; apex pointed, commonly produced. Tergum roughly rhomboidal, with V-shaped growth lines; carinal lateral margin shorter and more steeply inclined with respect to long axis as compared to upper lateral margin; apex blunt; shallow furrow lies parallel to and shortly removed from occludent margin. Carinal latus having carinal and basal margins of subequal length; carinobasal angle broadly obtuse. Peduncle widest at summit, joins capitulum with moderate obliquity, carinal and carinal lateral columns with one or two more plates than scutal and rostral columns; number of plates per column small for genus, usually 9 to 11 in larger specimens; base of peduncle bluntly rounded, rostral and carinal margins strongly convex. Height of peduncle averages slightly more than twice the height of capitulum. In lower part of peduncle, width of plates in paired columns is less than twice the height; width of these plates is three or more times the height at summit of peduncle; upper margins of plates nearly straight to gently convex; plates of upper lateral column wider than those of adjacent columns. |