DOI: 10.6086/d1697p
title: Data from: Trilobites of Thailand’s Cambrian-Ordovician Tarutao Group

description: Tuff-bearing upper Cambrian–lowermost Ordovician strata on Ko Tarutao
 (Tarutao Island) in 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 be
 closely associated with Australia, North China (Sino-Korea), and other
 continental fragments from the supercontinent’s northern equatorial sector
 including South China. Shared fauna with Kazakhstan are also notable and
 shared similiarities with Laurentia are of similar magnitude to those of
 some other parts of equatorial Gondwana. Extensive collections from eight
 different sections have yielded a number of newly-discovered taxa. With
 the new taxa and revision of taxa known previously, we refine the age of
 the upper formations of the Tarutao Group as the middle of Cambrian Stage
 10 and lower Tremadocian. Newly described taxa include Tsinania
 sirindhornae, Pseudokoldinioidia maneekuti, Pagodia? uhleini, Asaphellus
 charoenmiti, Apatokephalus arcuatus, Yosimuraspis acufrons, Tarutaoia
 techawani, Jiia talowaois, Caznaia imsamuti, Caznaia? undulata,
 Lophosaukia nuchanongi, and Corbinia perforata. Taxa previouly unknown on
 Tarutao but described from other terranes include Mansuyia orientalis?
 Sun, Parakoldinioidia callosa Qian, Pseudagnostus Jaekel, Homagnostus
 obesus Belt, Haniwa mucronata Shergold, H. sosanensis Kobayashi, Lichengia
 simplex Shergold, Pacootasaukia Sohn and Choi, Wuhuia? Kobayashi,
 Plethopeltella Kobayashi, Akoldinioida lata Park and Kihm, and
 Koldinioidia choii Park and Kihm. 
description: The data contained herein includes morphometric landmark
 coordinates for specimens of <em>Quadraticephalus </em>and
 <em>Haniwa</em>, which are 2 different datasets. The landmark
 schemes for each genus are provided in the associated paper. Data was
 collected using ImageJ on Z-stacked images acquired with a Leica M-series
 stereoscope. Some, but not all, of these images can be found in the
 associated paper. A scale was used to record landmark placement, so the
 datasets are already adjusted for size comparisons and ontogeny. Data is
 formatted for use with the Integrated Morphometrics Package (Webster and
 Sheets, 2010). The code 999 indicates a missing landmark. 
description: This dataset (created with Excel) is formatted to be used with
 the Integrated Morphometrics Package (Webster and Sheets, 2010). The code
 999 indicates a missing landmark - these can still be used by reflecting
 and averaging the data which is bilaterally symmetrical. The files labeled
 "formatted" are ready to import to IMP. The other sheets contain
 additional information, including specimen numbers. DGSC indicates the
 Thai Department of Mineral Resources Geoscience Reference
 Collection. 
description: # Data from: Trilobites of Thailand’s Cambrian-Ordovician Tarutao Group
 [https://doi.org/10.6086/D1697P](https://doi.org/10.6086/D1697P) These
 datasets include morphometric landmark coordinates for specimens
 of *Quadraticephalus* and *Haniwa* (2 different datasets). The landmark
 schemes for each genus are provided in the associated paper. The principal
 purpose of this data set was to evaluate if and how to differentiate
 specimens into multiple species and consider reasons for intraspecific
 variation (e.g. ontogeny). Data was collected using ImageJ on Z-stacked
 images acquired with a Leica M-series stereoscope. Some, but not all, of
 these images can be found in the associated paper. A scale was used to
 record landmark placement, so the datasets are already adjusted for size
 comparisons and ontogeny. ## Description of the data and file structure
 This dataset (created with Excel) is formatted to be used with the
 Integrated Morphometrics Package (IMP; Webster and Sheets, 2010). The code
 999 indicates a missing landmark - these can still be used by reflecting
 and averaging the data which is bilaterally symmetrical. The files labeled
 "formatted" are ready to import to IMP. The other sheets contain
 additional information, including specimen numbers. DGSC indicates the
 Thai Department of Mineral Resources Geoscience Reference Collection.  ##
 Sharing/Access information The associated paper is the only place where
 this data is publicly available. Specimens may be accessed through the
 Cincinnati Museum Center or Thai Department of Mineral Resources
 Geoscience Reference Collection using the specimen numbers provided. * ##
 Code/Software N/A