Furongian (late Cambrian) trilobites from the<i>Asioptychaspis subglobosa</i>Zone of the Hwajeol Formation, Korea

Park, Tae-Yoon S.; Kihm, Ji-Hoon

doi:10.1080/03115518.2015.965546

Cited by 10 publications

(40 citation statements)

References 26 publications

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“…Sohn & Choi (2007) recognized three trilobite faunas within the formation: in ascending order, the Asioptychaspis Zone, the Quadraticephalus Zone and the saukiid-dominated fauna. Subsequently, Park & Kihm (2015 a ) revised the biostratigraphy of the lowermost part of the Hwajeol Formation, documenting 14 polymerid species belonging to 14 genera. They renamed the Asioptychaspis Zone the Asioptychaspis subglobosa Zone, and correlated it with the Asioptychaspis–Tsinania Zone of North China, and the Rhaptagnostus clarki patulus – Caznaia squamosa-Hapsidocare lilyensis and Rhaptagnostus clarki prolatus – Caznaia sectatrix zones of Australia, which are Jiangshanian (middle Furongian) in age.…”

Section: Fossil Locality and Materialsmentioning

confidence: 99%

“…They renamed the Asioptychaspis Zone the Asioptychaspis subglobosa Zone, and correlated it with the Asioptychaspis–Tsinania Zone of North China, and the Rhaptagnostus clarki patulus – Caznaia squamosa-Hapsidocare lilyensis and Rhaptagnostus clarki prolatus – Caznaia sectatrix zones of Australia, which are Jiangshanian (middle Furongian) in age. Limestone–shale couplets from the horizon 2.5 m above the base of the formation (CHBd08 horizon of Park & Kihm, 2015 a , fig. 1) were digested by hydrochloric acid to collect silicified specimens of trilobites.…”

Section: Fossil Locality and Materialsmentioning

confidence: 99%

“…Designation of lectotype . Park & Kihm (2015 a ) did not designate the holotype of this species, hence KOPRIF1189 (Fig. 1y) is designated here as the lectotype of A. latus .…”

Section: Ontogeny Of Akoldinioidia Latusmentioning

confidence: 99%

“…During the subsequent development, the number of axial rings increased, eventually with six axial rings including the terminal pieces. The description of the large holaspid pygidia has been given by Park & Kihm (2015 a ) and is not repeated here.…”

Section: Ontogeny Of Akoldinioidia Latusmentioning

confidence: 99%

“…This article deals with the ontogeny of two co-occurring middle Furongian (Jiangshanian Stage) shumardiids, Akoldinioidia latus Park & Kihm, 2015 a and Koldinioidia choii Park & Kihm, 2015 a from the Hwajeol Formation, Taebaeksan Basin, Korea. The silicified material from the Hwajeol Formation includes protaspides of these two shumardiid trilobites.…”

Section: Introductionmentioning

confidence: 99%

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Ontogeny of the two co-occurring middle Furongian (late Cambrian) shumardiid trilobites and the protaspid morphology of shumardiids

Park

2017

Geol. Mag.

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Shumardiid trilobites had a small, unique morphology, and formed a key constituent in trilobite faunas during the Cambrian–Ordovician. Because of their unusual morphology, they have been the subject of research s, into various aspects such as their life habit, functional morphology, evolutionary origin and ontogeny. Originally, a flat, adult-like protaspid morphology was suggested for shumardiids, but subsequently a bulbous protaspid morphology interpreted to be associated with metamorphosis was also suggested for this unique trilobite group. This article documents the ontogeny of the two co-occurring shumardiid trilobites, Akoldinioidia latus Park and Kihm and Koldinioidia choii Park and Kihm, from the middle Furongian Hwajeol Formation, Taebaeksan Basin, Korea. Interestingly, protaspides of the two shumardiids have a bulbous morphology. Given the stratigraphic occurrences of the two shumardiids, it can be inferred that commutavi protaspis appeared quite early in the shumardiid evolution. The co-occurrence of the two closely related trilobites is reminiscent of sexual dimorphism, although further evidence is required to prove it. The appearance of metamorphosis-undergoing protaspides in the Furongian shumardiids may have been due to the onset of increasing ecological pressure in the early phase of the Great Ordovician Biodiversification Event.

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Section: Fossil Locality and Materialsmentioning

confidence: 99%

Section: Fossil Locality and Materialsmentioning

confidence: 99%

“…Designation of lectotype . Park & Kihm (2015 a ) did not designate the holotype of this species, hence KOPRIF1189 (Fig. 1y) is designated here as the lectotype of A. latus .…”

Section: Ontogeny Of Akoldinioidia Latusmentioning

confidence: 99%

Section: Ontogeny Of Akoldinioidia Latusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ontogeny of the two co-occurring middle Furongian (late Cambrian) shumardiid trilobites and the protaspid morphology of shumardiids

Park

2017

Geol. Mag.

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Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting

Wernette,

Hughes,

Myrow

et al. 2023

Papers in Palaeontology

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Tuff‐bearing upper Cambrian to lowermost Ordovician strata on Ko Tarutao island, Satun province, southernmost peninsular Thailand, contain a rich trilobite fauna relevant to global biostratigraphy, peri‐Gondwanan palaeogeography and shifting evolutionary mode. This area of Sibumasu, a lower Palaeozoic marginal Gondwanan terrane, is shown to have been closely associated with Australia, North China (Sino‐Korea) and other continental fragments from the supercontinent's northern equatorial sector, including South China at that time. Shared faunas also suggest a Kazakhstani and Laurentian association. Collections from eight sections yielded 10 newly discovered species and one new genus from ancient shoreface and inner shelf siliciclastic deposits. With the new taxa and revision of taxa known previously, we refine the age of the upper two formations of the Tarutao Group to the middle of Cambrian Stage 10, and lower–middle Tremadocian. Two biozones are erected for Sibumasu: the Eosaukia buravasi Zone, encompassing all Cambrian sections from Ko Tarutao, and the Asaphellus charoenmiti Zone, encompassing the Tremadocian fauna discussed herein. The new genus is Tarutaoia and new species are Tsinania sirindhornae, Pseudokoldinioidia maneekuti, Pagodia? uhleini, Asaphellus charoenmiti, Tarutaoia techawani, Jiia talowaois, Caznaia imsamuti, Anderssonella undulata, Lophosaukia nuchanongi and Corbinia perforata. Other taxa reported for the first time from Tarutao are Mansuyia? sp., Parakoldinioidia callosa Qian, Pseudagnostus sp., Homagnostus sp., Haniwa mucronata Shergold, Haniwa sosanensis? Kobayashi, Lichengia simplex Shergold, Pacootasaukia sp., Wuhuia? sp., Plethopeltella sp., Apatokephalus sp., Akoldinioidia sp. 1 and Koldinioidia sp.

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Recent advances of trilobite research in Korea: Taxonomy, biostratigraphy, paleogeography, and ontogeny and phylogeny

Choi

Park

2017

Geosci J

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Trilobites are among the most diverse and abundant fossil groups in Korea and occur in the Cambrian-Ordovician Joseon Supergroup of the Taebaeksan Basin. The Cambrian-Ordovician trilobites of the Joseon Supergroup have been intensively studied during the last quarter century, with emphasis on taxonomic revision, refining biostratigraphic zonation, paleogeographic implications, and ontogeny and phylogeny. A total of 243 species have hitherto been known to occur in the Joseon Supergroup of the Taebaeksan Basin: 118 and 110 species were reported in the Taebaek and Yeongwol groups, respectively, whilst 15 species were described from the Mungyeong Group. Contrasting trilobite faunal contents of the Taebaek and Yeongwol/Mungyeong groups resulted in two separate biostratigraphic schemes for the Cambrian-Ordovician of the Taebaeksan Basin: 22 biozones or fossiliferous horizons were recognized in the Taebaek Group; 19 zones were established in the Yeongwol Group; and four biozones were known from the Mungyeong Group. These trilobite biozones of the Taebaeksan Basin can be correlated well with those of North China, South China, and Australia. The distribution of some of the Cambrian and Ordovician endemic trilobites and the detrital zircon spectra of the pertinent areas suggest that the Sino-Korean Craton was located at the margin of east Gondwana and was separated from the South China Craton by an oceanic basin, and that the Taebaeksan Basin was a part of an epeiric sea in east Gondwana. Focus of the ontogenetic research of Korean trilobites was initially on the Cambrian trilobites from the Machari Formation of the Yeongwol Group, and then, was shifted to the silicified sclerites dissolved out of the carbonates of the Guzhangian to Tremadocian strata of the Taebaek Group, which have played a crucial role in resolving the trilobite phylogeny. Still, much of the carbonate strata of the Taebaek Group containing silicified trilobites has remained unstudied. The future ontogenetic research on the trilobites from the middle Cambrian (Cambrian Series 3) and the Furongian strata of the Taebaek Group would significantly contribute to elucidating the muddled trilobite phylogeny.

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Furongian (late Cambrian) trilobites from theAsioptychaspis subglobosaZone of the Hwajeol Formation, Korea

Cited by 10 publications

References 26 publications

Ontogeny of the two co-occurring middle Furongian (late Cambrian) shumardiid trilobites and the protaspid morphology of shumardiids

Ontogeny of the two co-occurring middle Furongian (late Cambrian) shumardiid trilobites and the protaspid morphology of shumardiids

Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting

Recent advances of trilobite research in Korea: Taxonomy, biostratigraphy, paleogeography, and ontogeny and phylogeny

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