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Tripatocrinus

Crinoidea - Hybocrinida - Cornucrinidae

Taxonomy
Tripatocrinus was named by Sprinkle (1973) [Sepkoski's age data: O Llvi-l]. Its type is Tripatocrinus pustulatus.

It was assigned to Cornucrinidae by Sprinkle (1973) and Ausich (1998); and to Hybocrinida by Sepkoski (2002).

Species
T. pustulatus (type species)

Synonymy list
YearName and author
1973Tripatocrinus Sprinkle p. 871
1998Tripatocrinus Ausich p. 28
2002Tripatocrinus Sepkoski

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
—Ambulacraria
phylumEchinodermata
subphylumBlastozoa
classCrinoideaMiller 1821
RankNameAuthor
subclassPentacrinoideaJaekel 1918
infraclassInadunata(Wachsmuth and Springer 1897)
—Cladida(Moore and Laudon 1943)
superorderPorocrinoidea
orderHybocrinidaJaekel 1918
familyCornucrinidae
genusTripatocrinus

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. †Tripatocrinus Sprinkle 1973
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†Tripatocrinus pustulatus Sprinkle 1973
Diagnosis
ReferenceDiagnosis
J. Sprinkle 1973Armless hybocrinid crinoids having an ovoid calyx with a conical base and slight bulging on the posterior summit. Normal hybocrinid plating with five BB, five differently shaped RR plus RA, and five small 00, all developed in complete circlets, with anal X and two smaller accessory anals inserted on the posterior side. Three groovelike recumbent ambulacra, representing rays A, C, and D, run down over the calyx surface nearly to the stem facet on radials AR, LPR, and RPR + RA and on three of the interoral and inter- basal sutures. No specialized ambulacral (flooring) plates present. An elongate coelomic notch is present through the bottom of each ambulacrum between the radial and orals for passage of the radial water vessel and other coelomic systems from the calyx interior out to the ambulacral groove. PO bears a conspicuous slitlike hydropore just below the mouth. Small-diameter stem of unknown length present aborally. All calyx plates have strong pustular ornament on exterior plus traces of concentric growth lines on smooth interiors. Based only on disarticulated silicified plates. Early Middle Ordovician (Whiterockian), upper part of the Antelope Valley Limestone (Anomalorthis zone), Nevada and California.