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Haplophrentis

Hyolithida - Hyolithidae

Taxonomy
Haplophrentis was named by Babcock and Robison (1988) [Sepkoski's age data: Cm lMid-u Cm mMid-u]. Its type is Haplophrentis reesei.

It was assigned to Hyolithidae by Babcock and Robison (1988); and to Hyolithida by Sepkoski (2002).

Synonymy list
YearName and author
1988Haplophrentis Babcock and Robison p. 12
2002Haplophrentis Sepkoski

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
RankNameAuthor
—Lophophorata
phylumHyolitha
orderHyolithidaMathew 1962
familyHyolithidaeNicholson 1889
genusHaplophrentis

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. †Haplophrentis Babcock and Robison 1988
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†Haplophrentis carinatus Matthew 1899
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Invalid names: Haplophrentis cecrops Walcott 1917 [synonym], Haplophrentis costatus Matthew 1901 [synonym]
†Haplophrentis reesei Babcock and Robison 1988
Diagnosis
ReferenceDiagnosis
L. R. Babcock and R. A. Robison 1988Hyolithid with weak, longitudinal, dorsornedial septum in conch. Lateral longitudinal sulci singly paired on dorsum and venter.

Conch with single septum along inner dorsomedial surface, formed by thickening where slopes meet. Dorsum subangular, slopes subtly convex. Apical end slightly turned dorsally and laterally, usually to right. Lateral margins angular. Lateral longitudinal sulci singly paired on dorsum and venter, extending along entire length of shell. Venter slightly inflated. Ligula short, narrowly rounded. Apertural rim not flared. Aperture probably orthogonal. Growth lines fine, better developed on venter than dorsum.

Operculum questionably platyclaviculate; outline ovate, broad; apex bluntly pointed. Conical shield large, subtriangular; lateral sides nearly straight; ventral side broadly rounded. Cardinal shield broad, cardinal processes large. Growth lines and rugae present on shields, absent on rooflets.

Helens very thin, arcuate with slight vertical twist, tapering proximally and distally. Length along curve about 0.45 times maximum conch length, width about 0.06 times length. Growth lines fine, equally developed on both sides.