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Triplagnostus

Agnostida - Ptychagnostidae

Taxonomy
Triplagnostus was named by Howell (1935) [Sepkoski's age data: ]. It is not extant.

It was reranked as Ptychagnostus (Triplagnostus) by Westergård (1946); it was synonymized subjectively with Ptychagnostus by Jell and Adrain (2002).

It was assigned to Ptychagnostus by Westergård (1946); to Agnostida by Sepkoski (2002); and to Ptychagnostidae by Ergaliev and Ergaliev (2008) and Naimark and Pegel (2017).

Synonymy list
YearName and author
1935Triplagnostus Howell
1946Ptychagnostus (Triplagnostus) Westergård
2002Triplagnostus Sepkoski
2008Triplagnostus Ergaliev and Ergaliev
2017Triplagnostus Naimark and Pegel pp. 1179 - 1180

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Ecdysozoa
—Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
orderAgnostidaSalter 1864
suborderAgnostinaSalter 1864
superfamilyCondylopygoideaRaymond 1913
familyPtychagnostidaeKobayashi 1939
genusTriplagnostusHowell 1935

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. †Triplagnostus Howell 1935
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†Triplagnostus gibbus Linnarsson 1869
†Triplagnostus scopus Öpik 1979
†Triplagnostus ultimus Öpik 1979
Diagnosis
ReferenceDiagnosis
E. B. Naimark and T. V. Pegel 2017Cephalon with median preglabellar furrow. Glabellar M1 and M2 of equal width (not widened across M1 or M2); M1 inflated; F2 developed. Basal lobes with tendency to elongate, but usually oval. Pygidium with F1 and F2 equally developed; posteroaxis of moderate width and height. Posteroaxial furrow well developed. Prosopon usually smooth.
Measurements
No measurements are available
Entire body: yesf
Adult length: 1.0 to < 10f
Adult width: 1.0 to < 10f
Locomotion: slow-movingo
Life habit: epifaunalo
Diet: detritivoreo
Vision: blindf
Created: 2009-06-11 18:42:48
Modified: 2009-12-13 04:44:17
Source: f = family, o = order
References: Kiessling 2004, Hendy 2009

Age range: base of the Taijangian to the top of the Undillan or 509.00000 to 500.50000 Ma

Collections (41 total)


Time interval Ma Country or state Original ID and collection number
Delamaran511.2 - 506.5USA (Utah) Ptychagnostus gibbus (10566)
Amgan510.2 - 504.5USA (Utah) Ptychagnostus gibbus (225065 225070)
Amgan510.2 - 504.5Russian Federation T. anabarensis (235430)
Amgan510.2 - 504.5Russian Federation (Siberia) Ptychagnostus gibbus (10002)
Solvan510.2 - 504.5Canada (Newfoundland and Labrador) Ptychagnostus gibbus (10836)
Solvan - Menevian510.2 - 499.5Czech Republic Ptychagnostus vinicensis (73529)
Taijangian509.0 - 504.5China (Hunan) Ptychagnostus gibbus (49149 49158 49273)
Taijangian509.0 - 504.5China (Zhejiang) T. gibbus (125536)
Middle Cambrian509.0 - 497.0Norway Ptychagnostus gibbus (155475)
Middle Cambrian509.0 - 497.0USA (Utah) Ptychagnostus gibbus (86728 86729 86730 86731 86732 86733 86735 86736 86737 86738 86739 86741 86742)
Middle Cambrian509.0 - 497.0Poland Ptychagnostus gibbus (72272)
Taijangian - Guzhangian509.0 - 497.0China (Anhui) T. sp. (127474)
Tuesaian505.3 - 503.0Kazakhstan T. gibbus (118054 118085)
Floran504.5 - 503.0Australia (Queensland) T. diremptus (225224) T. fretus, T. posterus, T. stramineus, T. quasigibbus, T. scopus (225241) T. posterus, T. sp. indet. (225175)
Floran504.5 - 503.0Australia (Northern Territory) T. gibbus (225075)
Menevian504.5 - 499.5USA (Utah) Ptychagnostus gibbus (10507)
Marjumian504.5 - 497.0USA (Utah) Ptychagnostus gibbus (230682)
Wangcunian504.5 - 497.0China (Jiangsu) T. sp. (127368)
Undillan503.0 - 500.5Australia (Queensland) Aristarius ultimus (225232 225246) T. diremptus (225226 225229) T. gibbus (225230)