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Wednesday, January 17th, 2024
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| 3:27a | [Paleontology • 2024] Garzapelta muelleri • A New aetosaur (Archosauria: Pseudosuchia) from the Late Triassic (middle Norian) middle Cooper Canyon Formation, Dockum Group, Texas, USA, and its implications on our understanding of the morphological disparit
Abstract The Late Triassic Dockum Group in northwestern Texas preserves a rich diversity of pseudosuchian taxa, particularly of aetosaurs. In this contribution, we present Garzapelta muelleri gen. et sp. nov., a new aetosaur from the Late Triassic middle Cooper Canyon Formation (latest Adamanian–earliest Revueltian teilzones) in Garza County, Texas, based on an associated specimen that preserves a significant portion of its dorsal carapace. The carapace of G. muelleri exhibits a striking degree of similarity between that of the paratypothoracin Rioarribasuchus chamaensis and desmatosuchins. We quantitatively assessed the relationships of G. muelleri using several iterations of the matrix. Scoring the paramedian and lateral osteoderms of G. muelleri independently results in conflicting topologies. Thus, it is evident that our current matrix is limited in its ability to discern the convergence within this new taxon and that our current character lists are not fully accounting for the morphological disparity of the aetosaurian carapace. Qualitative comparisons suggest that G. muelleri is a Rioarribasuchus-like paratypothoracin with lateral osteoderms that are convergent with those of desmatosuchins. Although the shape of the dorsal eminence, and the presence of a dorsal flange that is rectangular and proportionately longer than the lateral flange are desmatosuchin-like features of G. muelleri, the taxon does not exhibit the articulation style between the paramedian and lateral osteoderms which diagnose the Desmatosuchini (i.e., a rigid interlocking contact, and an anteromedial edge of the lateral osteoderm that overlaps the adjacent paramedian osteoderm). Keywords: Aetosaur, Dockum Group, Late Triassic, Revueltian, Texas   William A. Reyes, Jeffrey W. Martz, Bryan J. Small. 2024. Garzapelta muelleri gen. et sp. nov., A New aetosaur (Archosauria: Pseudosuchia) from the Late Triassic (middle Norian) middle Cooper Canyon Formation, Dockum Group, Texas, USA, and its implications on our understanding of the morphological disparity of the aetosaurian dorsal carapace. The Anatomical Record. DOI: 10.1002/ar.25379 | ||||
| 7:53p | [Botany • 2023] Nepenthes calcicola (Nepenthaceae) • A New Pitcher Plant from Gulf Province, Papua New Guinea
Abstract A new species of pitcher plant from rain forest on limestone karst in the Purari River catchment in the Gulf Province of Papua New Guinea is described and illustrated as Nepenthes calcicola Gary W.Wilson, S.Venter & Damas. It is distinguished from N. neoguineensis on the basis of its distribution, ecology, habitat, and pitcher and inflorescence morphology. The new species is illustrated, and description is here given. The species is assessed as Vulnerable (VU) according to IUCN criteria. Keywords: Nepenthaceae; pitcher; Papua New Guinea; taxonomy; karst
Nepenthes calcicola Gary W.Wilson, S.Venter & Damas, spec. nov. Nepenthes calcicola differs from N. neoguineensis in having stems that grow beneath the layer of leaf litter (vs. stems above leaf litter); short stems and rosettes of pitchers present (vs. absent); spur terete and recurved (vs. dorsiventrally flattened and not recurved; female inflorescence peduncle 160–190 × 3.0–4.0 mm (vs. 120–150 × 2.0 –2.5 mm); tepals obovate to broadly-obovate (vs. orbicular-elliptic). Etymology. The specific epithet describes the calcareous substrate the plants grow in Gary W. Wilson, Stephanius Venter, Kapiro Q. Damas. 2023. Nepenthes calcicola (Nepenthaceae), A New Pitcher Plant from Gulf Province, Papua New Guinea. REINWARDTIA. 22(2); 103‒109. DOI: 10.55981/reinwardtia.2023.4536 — Sebuah jenis baru kantong semar dari hutan hujan di batugamping di DAS Sungai Purari di Provinsi Teluk Papua Nugini dipertelakan dan diilustrasikan sebagai Nepenthes calcicola Gary W.Wilson, S.Venter & Damas. Jenis ini dibedakan dari N. neoguineensis berdasarkan distribusi, ekologi, habitat, dan morfologi kantong dan perbungaannya. Pertelaan dan ilustrasi dari jenis baru ini disajikan dalam naskah ini. Status konservasi jenis ini berdasarkan kriteria IUCN adalah jenis rentan (VU). Kata kunci: Batugamping, kantong, Nepenthaceae, Papua Nugini, taksonomi. |
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