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Microcornus eximius

Hyolithida - Nelegerocornidae

Taxonomy
Microcornus eximius was named by Duan (1984) [DISTRIBUTION: Cambrian; China. COMMENTS: Duan in Xing et al. 1984]. Its type specimen is SH 1001, a shell, and it is a 3D body fossil.

Synonymy list
YearName and author
1984Microcornus eximius Duan p. 153 figs. pl. 1, fig. 5
1984Microcornus eximius Xing et al. p. 153 figs. pl. 1: 5
2001Microcornus eximius Gravestock et al. p. 100 figs. Pl. X, fig. 12a, b
2004Microcornus eximius Malinky and Skovsted p. 556 figs. 3A-B
2006Microcornus eximius Wotte p. 154

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
RankNameAuthor
Lophophorata
phylumHyolitha
orderHyolithidaMathew 1962
familyNelegerocornidae
genusMicrocornus
specieseximius

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.

Diagnosis
ReferenceDiagnosis
J. M. Malinky and C.B. Skovsted 2004Conch orthoconic although with slight apical curvature toward right when viewed from dorsum; apical angle large such that conch has wide appearance; venter slightly inflated, grading into rounded lateral edges which in turn pass into nearly flat, only slightly inflated dorsal flanks; flanks meet in high, almost keel−like median ridge. Cross−section has rounded triangular shape. Aperture appears orthogonal with long ligula having steeply dipping sides toward aperture; anterior edge of ligula rounded; lateral sinuses well−developed, as is sinus in centre of dorsal apertural rim. Surface of shell covered with fine, equally spaced growth lines that are most prominent next to aperture but become fainter in direction of apex. Distinct bulbous protoconch separated from remainder of conch by shallow constriction.