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Medfrazyga gilmulli

Gastropoda - Murchisoniina - Palaeozygopleuridae

Taxonomy
Medfrazyga gilmulli was named by Rohr et al. (2008). Its type specimen is USNM 534466, a skeleton, and it is not a trace fossil. Its type locality is 2004R-1, south side of logging road, Twin Mountains area, Prince Wales Island, which is in a Ludlow carbonate wackestone in the Heceta Limestone Formation of Alaska.

Synonymy list
YearName and author
2008Medfrazyga gilmulli Rohr et al. p. 610 figs. 4.1-4.3

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classGastropoda
subclassOrthogastropoda
orderMurchisoniina
superfamilyLoxonematoidea(Koken 1889)
familyPalaeozygopleuridae
genusMedfrazyga
speciesgilmulli

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.

Medfrazyga gilmulli Rohr et al. 2008
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Diagnosis
ReferenceDiagnosis
D. M. Rohr et al. 2008Species of Medfrazyga with thinner costae than the type species and higher whorls.

Medium-sized, slender, high-spired, dextrally coiled shell, having up to seven whorls; sides of shell approximately straight; whorl profile strongly and symmetrically convex; whorls high and narrow; deep sutures; sutural slope angle high and increasing during shell ontogeny; lateral part of whorl curving uniformly onto shell base, forming a smooth curvature without any edge; shell base anomphalous; outer apertural lip strongly and asymmetrically opisthocyrt; shell ornament consists of prominent, regularly spaced, asymmetrically opisthocyrt costae; beginning at the upper suture, the costae initially inclined in a prosocline direction, gradually curve in an orthocline direction, and finally end in an opisthocline direction to form a wide, asymmetrical arched sinus; sinus culminates close to upper suture; distance between costae greater than costae width.