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Orthotheca

Orthothecida - Orthothecidae

Taxonomy
Orthotheca was named by Novak (1886) [Sepkoski's age data: Cm Tomm-l D Eife Sepkoski's reference number: 1,268,885]. Its type is Cryptocaris suavis.

It was reranked as Hyolithus (Orthotheca) by Holm (1893); it was reranked as Hyolithes (Orthotheca) by Reed (1909) and Resser and Endo (1937).

It was assigned to Hyolithus by Holm (1893); to Hyolithes by Reed (1909) and Resser and Endo (1937); to Hyolithidae by Henningsmoen (1952); to Orthothecida by Sepkoski (2002) and Malinky (2003); and to Orthothecidae by Fisher (1962), Malinky (1990) and Malinky (2009).

Synonymy list
YearName and author
1886Orthotheca Novak
1893Hyolithus (Orthotheca) Holm
1909Hyolithes (Orthotheca) Reed p. 211
1937Hyolithes (Orthotheca) Resser and Endo
1952Orthotheca Henningsmoen
1962Orthotheca Fisher p. 125
1990Orthotheca Malinky p. 229
2002Orthotheca Sepkoski
2003Orthotheca Malinky p. 641
2009Orthotheca Malinky p. 591

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
RankNameAuthor
—Lophophorata
phylumHyolitha
orderOrthothecida
familyOrthothecidae
genusOrthothecaNovak 1886

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.

G. †Orthotheca Novak 1886
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†Orthotheca buelna Lochman 1952
†Orthotheca corrugata Matthew 1899
†Orthotheca daulis Walcott 1905
†Orthotheca doris Walcott 1905
†Orthotheca shriveri Malinky 2009
†Orthotheca suavis Barrande 1872
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Invalid names: Orthotheca intermedia Novak 1886 [objective synonym]
†Orthotheca subornatus Reed 1909
†Orthotheca teretiuscula Linnarsson 1877
Diagnosis
ReferenceDiagnosis
J. M. Malinky 2009Hyoliths having a tightly rounded dorsal ridge, grading into tightly rounded to angular lateral edges; the venter is only slightly concave to nearly flat, and the resulting cross section has a triangular shape. Ornamentation on the shell includes longitudinal ribs or lines.