diff --git a/data/03/B8/6E/03B86E7CFA276E323B97F961E5A9FD30.xml b/data/03/B8/6E/03B86E7CFA276E323B97F961E5A9FD30.xml new file mode 100644 index 00000000000..28038cf3715 --- /dev/null +++ b/data/03/B8/6E/03B86E7CFA276E323B97F961E5A9FD30.xml @@ -0,0 +1,310 @@ + + + +New records of Palaeopaschichnus Palij, 1976 from the Ediacaran of Romania + + + +Author + +Martin, Jean-Paul Saint +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) +jpsmart@mnhn.fr + + + +Author + +Charbonnier, Sylvain +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) + + + +Author + +Martin, Simona Saint +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) + + + +Author + +Cazes, Lilian +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) + + + +Author + +André, Jean-Pierre +100, chemin des tilleuls, 13160 Châteaurenard (France) + +text + + +Geodiversitas + + +2025 + +2025-01-09 + + +47 + + +1 + + +1 +16 + + + + +https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/geodiversitas2025v47a1.pdf + +journal article +10.5252/geodiversitas2025v47a1 +1638-9395 +14620093 +urn:lsid:zoobank.org:pub:4D31AE72-DD52-4E81-93D3-DD581D63396D + + + + + +Palaeopascichnus linearis +( +Fedonkin, 1976 +) + + + + + +( +Figs 6 +; +7 +) + + + + +SYNONYMY +. — See details in + +Kolesnikov +et al. +(2018a) + +and +Kolesnikov & Desiatkin (2022) +. The original name – + +Margaritichnus linearis +Fedonkin, 1976 + +– was first proposed for a supposed trace fossil (chains of faecal pellets). The species was later revised with the diagnosis emended to correspond to a body fossil (see + +Kolesnikov +et al. +2018 +a + +and Kolesnikov & Desiatkin 2022). + + + + +EMENDED +DIAGNOSIS +. — Test agglutinated, elongated, curved or rectilinear, occasionally branching, consists of a single series of globular or ellipsoidal chambers +1-15 mm +in width. The series occasionally diverge dichotomously. Chambers are relatively consistent in size within a series or gradually increase in width before diverging, but the length-to width ratio of the chambers is relatively constant along the series. The wall thickness does not exceed +1 mm +. Number of chambers in a series ranges between 3 and 5 and 30-40. + + + + + + +TYPE + + + +AGE + +. — Late Ediacaran. + + + +EXAMINED SPECIMENS. — + +Romania + +• +1 specimen +( +in situ +specimens and cast); +Casimcea +; +MNHN +. +F.A92246 +• + + +Rahman +; +1 specimen +( +in situ +specimen). + + + + + +DESCRIPTION + + +Casimcea specimens + + +The specimen from the S1 surface is preserved as positive epirelief visible on a roughly rectangular area ( +c. +30 × +70 cm +) exhibiting some slightly marked ripples ( +Fig. 6A, B +). It consists of meandering segments with parallel edges, of fairly constant width ( +8 mm +in average). The segments are composed of a series of generally consecutive apparently incurved-arcuate elements, about +4 mm +thick, with low positive epirelief ( +Fig. 6C +). They were considered as chambers by + +Kolesnikov +et al. +(2018b) + +. Elements are separated by a shallow incurved depression ( +c. +1 mm +wide). The parallel edges of the segments are often visible and marked by a fine negative epirelief groove ( +0.5 mm +wide; +Fig. 6C +). One imprint differs by the lack of the successive elements between the two parallel lines ( +Fig. 6D +). The photogrammetry of the mold reveals the bumpy appearance of the surface and the arrangement of the fossil ( +Fig. 6B, C +). The lateral delimitation of segments seems to correspond to a tubular structure enclosing the arcuate elements ( +Fig. 6B +). In several cases, a divergence of the segments occurs ( +Fig. 6C +). Just before the branching, the terminal element is wider than the preceding elements and those of the two divergent segments, up to +1 cm +. In two cases, a segment can cross another but overlapping ( +Fig. 6C +). This superposition may result from the crushing of two distinct parts of the initial body, not located in the same plane. + + +The largest surface S2 exhibits discreet meandering imprint with parallel lines and segmented elements ( +Fig. 7A +). Another imprint, perpendicular to the previous one, with two parallel lines without distinguishable constitutive elements ( +Fig. 7B +) is here also present as for the S1 surface ( +Fig. 6B, D +). + + + +Rahman specimen + + + +The specimen is clearly visible only over a length of about +15 cm +. It is probably only part of a larger body fossil. It corresponds to a slightly sinuous imprint with parallel edges and constant width ( +c. +1 cm +). It is composed of millimeter thick arcuate elements in slightly marked positive relief ( +Fig. 7C, D +). These characteristics are similar to those on Casimcea S2 surface. + + + + +DISCUSSION + + +According to recent studies, the Romanian specimens have palaeopascichnid characteristics: 1) bedding plane-parallel modular fossils consisting of simple or more complex series of closely spaced millimetric circular, sausage- or kidney-shaped units ( + +Jensen +et al. +2018 + +); 2) macroscopic modular chain-like fossils ( +Kolesnikov 2019 +), serially arranged, millimetre-scale allantoid chambers ( + +Hawco +et al. +2019 + +); and 3) serially or cluster-like arranged, millimetre- to centimetre-scale globular or allantoid chambers ( +Kolesnikov & Desiatkin 2022 +). Morphometric and taxonomic analyses characterized and discriminated different species of + +Palaeopascichnus + +or morphospecies ( + +Hawco +et al. +2019 + +; +Hawco 2020 +; + +Kolesnikov +et al. +2018b + +; +Kolesnikov 2019 +; + +Desiatkin +et al. +2021 + +; +Kolesnikov & Desiatkin 2022 +). Based on these works, the Romanian specimens are here assigned to + +Palaeopascichnus linearis +( +Fedonkin, 1976 +) + +because of their relative consistency in the size of arcuate elements (considered as chambers) throughout the series, which is not seen in the +type +species. + +Palaeopascichnus linearis + +shares common characters with the +type +species, such as the possible branching of the series, as observed in the Romanian specimens. + + + + \ No newline at end of file diff --git a/data/03/B8/6E/03B86E7CFA276E33391FFAC6E4D9F970.xml b/data/03/B8/6E/03B86E7CFA276E33391FFAC6E4D9F970.xml new file mode 100644 index 00000000000..68b50bd0231 --- /dev/null +++ b/data/03/B8/6E/03B86E7CFA276E33391FFAC6E4D9F970.xml @@ -0,0 +1,224 @@ + + + +New records of Palaeopaschichnus Palij, 1976 from the Ediacaran of Romania + + + +Author + +Martin, Jean-Paul Saint +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) +jpsmart@mnhn.fr + + + +Author + +Charbonnier, Sylvain +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) + + + +Author + +Martin, Simona Saint +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) + + + +Author + +Cazes, Lilian +Centre de Recherche en Paléontologie (UMR 7207 CR 2 P), CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, Département Origines & Évolution, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) + + + +Author + +André, Jean-Pierre +100, chemin des tilleuls, 13160 Châteaurenard (France) + +text + + +Geodiversitas + + +2025 + +2025-01-09 + + +47 + + +1 + + +1 +16 + + + + +https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/geodiversitas2025v47a1.pdf + +journal article +10.5252/geodiversitas2025v47a1 +1638-9395 +14620093 +urn:lsid:zoobank.org:pub:4D31AE72-DD52-4E81-93D3-DD581D63396D + + + + + +Genus + +Palaeopascichnus +Palij, 1976 + + + + + + + + +TYPE + + + +SPECIES + +. — + +Palaeopascichnus delicatus +Palij, 1976 + +by original designation. + + + + +INCLUDED +FOSSIL + +SPECIES + +. — + +P. delicatus +Palij, 1976 + +, + +P. gracilis +Fedonkin, 1985 + +and + +P. linearis +( +Fedonkin, 1976 +) + +. + + + + +REMARKS + + +The Ediacaran fossils belonging to the palaeopascichnid group and more particularly to + +Palaeopascichnus + +remain enigmatic. The description and diagnosis of + +Palaeopascichnus + +and related species were oriented by their morphological characteristics and possible affinity (for example trace fossils +vs. +body fossils). +Kolesnikov & Desiatkin (2022) +recalled that the initial definition of + +Palaeopascichnus + +was established for an ichnogenus, a concept subsequently abandoned (see discussion). + + +Recent taxonomic studies ( + +Kolesnikov +et al. +2018a + +, b; +Kolesnikov & Desiatkin 2022 +) proposed to include + +Orbisiana +Sokolov, 1976 + +as well as + +P.gracilis +Fedonkin, 1985 + +and + +P.linearis +( +Fedonkin, 1976 +) + +within the palaeopascichnids. They further excluded species differing significantly from classic palaeopascichnid fossils such as + +Palaeopascichnus minimus +Shen, Xiao, Dong, Zhou & Liu, 2007 + +, + +P. meniscatus +Shen, Xiao, Dong, Zhou & Liu, 2007 + +( + +Shen +et al. +2007 + +), + +P. wangjiawamensis +(Jigeng, Daqing & Tinggui, 2009) + +, and + +P.jiumenensis +( +Dong, Xiao, Shen & Zhou, 2008 +) + +. Consecutively a new approach to + +Palaeopascichnus + +was proposed by + +Kolesnikov +et al. +(2018a + +, b) and +Kolesnikov & Desiatkin (2022) +as follows: + +Recumbent colonial agglutinated chambered organisms. Chambers are globular or elongated; they are organized in series that branch repeatedly. Width and/or length of chambers can be consistent with each specimen, but in most cases it is gradually increasing at various rates. + + + \ No newline at end of file