identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
03B86E7CFA276E33391FFAC6E4D9F970.text	03B86E7CFA276E33391FFAC6E4D9F970.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Palaeopascichnus Palij 1976	<div><p>Genus  Palaeopascichnus Palij, 1976</p><p>TYPE SPECIES. —  Palaeopascichnus delicatus Palij, 1976 by original designation.</p><p>INCLUDED FOSSIL SPECIES. —  P. delicatus Palij, 1976,  P. gracilis Fedonkin, 1985 and  P. linearis (Fedonkin, 1976) .</p><p>REMARKS</p><p>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 &amp; Desiatkin (2022) recalled that the initial definition of  Palaeopascichnus was established for an ichnogenus, a concept subsequently abandoned (see discussion).</p><p>Recent taxonomic studies (Kolesnikov et al. 2018a, b; Kolesnikov &amp; 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 &amp; Liu, 2007,  P. meniscatus Shen, Xiao, Dong, Zhou &amp; Liu, 2007 (Shen et al. 2007),  P. wangjiawamensis (Jigeng, Daqing &amp; Tinggui, 2009), and  P.jiumenensis (Dong, Xiao, Shen &amp; Zhou, 2008) . Consecutively a new approach to  Palaeopascichnus was proposed by Kolesnikov et al. (2018a, b) and Kolesnikov &amp; Desiatkin (2022) as follows:</p><p>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.</p></div>	https://treatment.plazi.org/id/03B86E7CFA276E33391FFAC6E4D9F970	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Martin, Jean-Paul Saint;Charbonnier, Sylvain;Martin, Simona Saint;Cazes, Lilian;André, Jean-Pierre	Martin, Jean-Paul Saint, Charbonnier, Sylvain, Martin, Simona Saint, Cazes, Lilian, André, Jean-Pierre (2025): New records of Palaeopaschichnus Palij, 1976 from the Ediacaran of Romania. Geodiversitas 47 (1): 1-16, DOI: 10.5252/geodiversitas2025v47a1, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/geodiversitas2025v47a1.pdf
03B86E7CFA276E323B97F961E5A9FD30.text	03B86E7CFA276E323B97F961E5A9FD30.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Palaeopascichnus linearis (Fedonkin 1976)	<div><p>Palaeopascichnus linearis (Fedonkin, 1976)</p><p>(Figs 6; 7)</p><p>SYNONYMY. — See details in Kolesnikov et al. (2018a) and Kolesnikov &amp; 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 &amp; Desiatkin 2022).</p><p>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.</p><p>TYPE AGE. — Late Ediacaran.</p><p>EXAMINED SPECIMENS. — Romania • 1 specimen (in situ specimens and cast);  Casimcea; MNHN. F.A92246 •   Rahman; 1 specimen (in situ specimen).</p><p>DESCRIPTION</p><p>Casimcea specimens</p><p>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.</p><p>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).</p><p>Rahman specimen</p><p>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.</p><p>DISCUSSION</p><p>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 &amp; 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 &amp; 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.</p></div>	https://treatment.plazi.org/id/03B86E7CFA276E323B97F961E5A9FD30	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Martin, Jean-Paul Saint;Charbonnier, Sylvain;Martin, Simona Saint;Cazes, Lilian;André, Jean-Pierre	Martin, Jean-Paul Saint, Charbonnier, Sylvain, Martin, Simona Saint, Cazes, Lilian, André, Jean-Pierre (2025): New records of Palaeopaschichnus Palij, 1976 from the Ediacaran of Romania. Geodiversitas 47 (1): 1-16, DOI: 10.5252/geodiversitas2025v47a1, URL: https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/geodiversitas2025v47a1.pdf
