EdenteV2, PascalFrancis, Corpus, bibRecord, 000145

The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Rios Province, Argentina, with remarks on their systematics and biogeography

Identifieur interne : 000145 ( PascalFrancis/Corpus ); précédent : 000144; suivant : 000146

The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Rios Province, Argentina, with remarks on their systematics and biogeography

Auteurs : Diego Brandoni

Source :

Geobios : (Lyon) [ 0016-6995 ] ; 2011.

RBID : Pascal:11-0222345

Descripteurs français

Pascal (Inist)
- Xenarthra, Biogéographie, Paléobiogéographie, Miocène sup, Ossement, Biostratigraphie, Conglomérat, Unité stratigraphique, Taxinomie, Province Entre Rios, Megalonychidae, Argentine.

English descriptors

KwdEn :
- Argentina, Xenarthra, biogeography, biostratigraphy, bones, conglomerate, paleobiogeography, stratigraphic units, taxonomy, upper Miocene.

Abstract

Megalonychidae are known from the Deseadan of Argentina and Bolivia to the present, represented by the tree sloth Choloepus Illiger. The principal fossil records of this clade are those from the Quaternary of Central America and the Antilles (e.g., Megalocnus Leidy, Acratocnus Anthony) and North America (e.g., Megalonyx Harlan, Pliometanastes Hirschfeld and Webb). From the Quaternary of South America, Megalonychidae are recorded in Peru (Diabolotherium Pujos, De luliis, Argot and Werdelin) and Brazil (e.g., Ahytherium Cartelle, De Iuliis and Pujos, Australonyx De Iuliis, Pujos and Cartelle). In Argentina they also have been recorded in the Santa Cruz Formation (early-middle Miocene) on the coast of Santa Cruz Province (Eucholaeops Ameghino), Arroyo Chasicó Formation (Protomegalonyx Kraglievich), Río Negro Formation, in the "conglomerado osífero" (ossiferous conglomerate) or "Mesopotamiense" (late Miocene) at the base of Ituzaingó Formation, Entre Ríos Province, and Pleistocene of Buenos Aires Province. Several authors have studied the Megalonychidae from the "conglomerado osífero", but no systematic revision of the group has been undertaken beyond the original naming of species. Taking into account that a broad range of individual variation has been observed in the Megalonychidae from the Pleistocene of North America and the West Indies, and that a similar range probably existed among the megalonychids from the "conglomerado osífero", then the number of valid species might be lower than previously proposed. Thus, the valid species recovered from the "conglomerado osífero" are Ortotherium laticurvatum Ameghino, Pliomorphus mutilatus Ameghino, Amphiocnus paranense Kraglievich, Protomegalonyx doellojuradoi Kraglievich, Pr. Praecursor Kraglievich, Megalonychops primigenius Kraglievich, and Paranabradys vucetichae Scillato-Yané. However, the establishment of synonymies, as well as the generic and specific assignation of the specimens is not an easy task, due to the peculiar taphonomical context of this stratigraphic unit.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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C01	`01`		`ENG`	@0 Megalonychidae are known from the Deseadan of Argentina and Bolivia to the present, represented by the tree sloth Choloepus Illiger. The principal fossil records of this clade are those from the Quaternary of Central America and the Antilles (e.g., Megalocnus Leidy, Acratocnus Anthony) and North America (e.g., Megalonyx Harlan, Pliometanastes Hirschfeld and Webb). From the Quaternary of South America, Megalonychidae are recorded in Peru (Diabolotherium Pujos, De luliis, Argot and Werdelin) and Brazil (e.g., Ahytherium Cartelle, De Iuliis and Pujos, Australonyx De Iuliis, Pujos and Cartelle). In Argentina they also have been recorded in the Santa Cruz Formation (early-middle Miocene) on the coast of Santa Cruz Province (Eucholaeops Ameghino), Arroyo Chasicó Formation (Protomegalonyx Kraglievich), Río Negro Formation, in the "conglomerado osífero" (ossiferous conglomerate) or "Mesopotamiense" (late Miocene) at the base of Ituzaingó Formation, Entre Ríos Province, and Pleistocene of Buenos Aires Province. Several authors have studied the Megalonychidae from the "conglomerado osífero", but no systematic revision of the group has been undertaken beyond the original naming of species. Taking into account that a broad range of individual variation has been observed in the Megalonychidae from the Pleistocene of North America and the West Indies, and that a similar range probably existed among the megalonychids from the "conglomerado osífero", then the number of valid species might be lower than previously proposed. Thus, the valid species recovered from the "conglomerado osífero" are Ortotherium laticurvatum Ameghino, Pliomorphus mutilatus Ameghino, Amphiocnus paranense Kraglievich, Protomegalonyx doellojuradoi Kraglievich, Pr. Praecursor Kraglievich, Megalonychops primigenius Kraglievich, and Paranabradys vucetichae Scillato-Yané. However, the establishment of synonymies, as well as the generic and specific assignation of the specimens is not an easy task, due to the peculiar taphonomical context of this stratigraphic unit.
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Format Inist (serveur)

NO :	PASCAL 11-0222345 INIST
ET :	The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Rios Province, Argentina, with remarks on their systematics and biogeography
AU :	BRANDONI (Diego)
AF :	Laboratorio de Paleontologia de Vertebrados, CICYTTP-CONICET, Materi y Espana, (3105) Diamante/Entre Rios/Argentine (1 aut.)
DT :	Publication en série; Niveau analytique
SO :	Geobios : (Lyon); ISSN 0016-6995; France; Da. 2011; Vol. 44; No. 1; Pp. 33-44; Abs. français/espagnol; Bibl. 1 p.3/4
LA :	Anglais
EA :	Megalonychidae are known from the Deseadan of Argentina and Bolivia to the present, represented by the tree sloth Choloepus Illiger. The principal fossil records of this clade are those from the Quaternary of Central America and the Antilles (e.g., Megalocnus Leidy, Acratocnus Anthony) and North America (e.g., Megalonyx Harlan, Pliometanastes Hirschfeld and Webb). From the Quaternary of South America, Megalonychidae are recorded in Peru (Diabolotherium Pujos, De luliis, Argot and Werdelin) and Brazil (e.g., Ahytherium Cartelle, De Iuliis and Pujos, Australonyx De Iuliis, Pujos and Cartelle). In Argentina they also have been recorded in the Santa Cruz Formation (early-middle Miocene) on the coast of Santa Cruz Province (Eucholaeops Ameghino), Arroyo Chasicó Formation (Protomegalonyx Kraglievich), Río Negro Formation, in the "conglomerado osífero" (ossiferous conglomerate) or "Mesopotamiense" (late Miocene) at the base of Ituzaingó Formation, Entre Ríos Province, and Pleistocene of Buenos Aires Province. Several authors have studied the Megalonychidae from the "conglomerado osífero", but no systematic revision of the group has been undertaken beyond the original naming of species. Taking into account that a broad range of individual variation has been observed in the Megalonychidae from the Pleistocene of North America and the West Indies, and that a similar range probably existed among the megalonychids from the "conglomerado osífero", then the number of valid species might be lower than previously proposed. Thus, the valid species recovered from the "conglomerado osífero" are Ortotherium laticurvatum Ameghino, Pliomorphus mutilatus Ameghino, Amphiocnus paranense Kraglievich, Protomegalonyx doellojuradoi Kraglievich, Pr. Praecursor Kraglievich, Megalonychops primigenius Kraglievich, and Paranabradys vucetichae Scillato-Yané. However, the establishment of synonymies, as well as the generic and specific assignation of the specimens is not an easy task, due to the peculiar taphonomical context of this stratigraphic unit.
CC :	001E01Q04; 001E01I; 227A04; 224A
FD :	Xenarthra; Biogéographie; Paléobiogéographie; Miocène sup; Ossement; Biostratigraphie; Conglomérat; Unité stratigraphique; Taxinomie; Province Entre Rios; Megalonychidae; Argentine
FG :	Edentata; Eutheria; Theria; Mammalia; Tetrapoda; Vertebrata; Chordata; Miocène; Néogène; Tertiaire sup; Tertiaire; Cénozoïque; Phanérozoïque; Roche clastique; Roche sédimentaire; Amérique du Sud
ED :	Xenarthra; biogeography; paleobiogeography; upper Miocene; bones; biostratigraphy; conglomerate; stratigraphic units; taxonomy; Argentina
EG :	Edentata; Eutheria; Theria; Mammalia; Tetrapoda; Vertebrata; Chordata; Miocene; Neogene; upper Tertiary; Tertiary; Cenozoic; Phanerozoic; clastic rocks; sedimentary rocks; South America
SD :	Xenarthra; Biogeografía; Mioceno sup; Osamenta; Bioestratigrafía; Conglomerado; Unidad estratigráfica; Taxonomía; Argentina
LO :	INIST-14199.354000193722270030
ID :	11-0222345

Links to Exploration step

Pascal:11-0222345

Le document en format XML

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<front><div type="abstract" xml:lang="en">Megalonychidae are known from the Deseadan of Argentina and Bolivia to the present, represented by the tree sloth Choloepus Illiger. The principal fossil records of this clade are those from the Quaternary of Central America and the Antilles (e.g., Megalocnus Leidy, Acratocnus Anthony) and North America (e.g., Megalonyx Harlan, Pliometanastes Hirschfeld and Webb). From the Quaternary of South America, Megalonychidae are recorded in Peru (Diabolotherium Pujos, De luliis, Argot and Werdelin) and Brazil (e.g., Ahytherium Cartelle, De Iuliis and Pujos, Australonyx De Iuliis, Pujos and Cartelle). In Argentina they also have been recorded in the Santa Cruz Formation (early-middle Miocene) on the coast of Santa Cruz Province (Eucholaeops Ameghino), Arroyo Chasicó Formation (Protomegalonyx Kraglievich), Río Negro Formation, in the "conglomerado osífero" (ossiferous conglomerate) or "Mesopotamiense" (late Miocene) at the base of Ituzaingó Formation, Entre Ríos Province, and Pleistocene of Buenos Aires Province. Several authors have studied the Megalonychidae from the "conglomerado osífero", but no systematic revision of the group has been undertaken beyond the original naming of species. Taking into account that a broad range of individual variation has been observed in the Megalonychidae from the Pleistocene of North America and the West Indies, and that a similar range probably existed among the megalonychids from the "conglomerado osífero", then the number of valid species might be lower than previously proposed. Thus, the valid species recovered from the "conglomerado osífero" are Ortotherium laticurvatum Ameghino, Pliomorphus mutilatus Ameghino, Amphiocnus paranense Kraglievich, Protomegalonyx doellojuradoi Kraglievich, Pr. Praecursor Kraglievich, Megalonychops primigenius Kraglievich, and Paranabradys vucetichae Scillato-Yané. However, the establishment of synonymies, as well as the generic and specific assignation of the specimens is not an easy task, due to the peculiar taphonomical context of this stratigraphic unit.</div>
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<fA66 i1="01"><s0>FRA</s0>
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<fC01 i1="01" l="ENG"><s0>Megalonychidae are known from the Deseadan of Argentina and Bolivia to the present, represented by the tree sloth Choloepus Illiger. The principal fossil records of this clade are those from the Quaternary of Central America and the Antilles (e.g., Megalocnus Leidy, Acratocnus Anthony) and North America (e.g., Megalonyx Harlan, Pliometanastes Hirschfeld and Webb). From the Quaternary of South America, Megalonychidae are recorded in Peru (Diabolotherium Pujos, De luliis, Argot and Werdelin) and Brazil (e.g., Ahytherium Cartelle, De Iuliis and Pujos, Australonyx De Iuliis, Pujos and Cartelle). In Argentina they also have been recorded in the Santa Cruz Formation (early-middle Miocene) on the coast of Santa Cruz Province (Eucholaeops Ameghino), Arroyo Chasicó Formation (Protomegalonyx Kraglievich), Río Negro Formation, in the "conglomerado osífero" (ossiferous conglomerate) or "Mesopotamiense" (late Miocene) at the base of Ituzaingó Formation, Entre Ríos Province, and Pleistocene of Buenos Aires Province. Several authors have studied the Megalonychidae from the "conglomerado osífero", but no systematic revision of the group has been undertaken beyond the original naming of species. Taking into account that a broad range of individual variation has been observed in the Megalonychidae from the Pleistocene of North America and the West Indies, and that a similar range probably existed among the megalonychids from the "conglomerado osífero", then the number of valid species might be lower than previously proposed. Thus, the valid species recovered from the "conglomerado osífero" are Ortotherium laticurvatum Ameghino, Pliomorphus mutilatus Ameghino, Amphiocnus paranense Kraglievich, Protomegalonyx doellojuradoi Kraglievich, Pr. Praecursor Kraglievich, Megalonychops primigenius Kraglievich, and Paranabradys vucetichae Scillato-Yané. However, the establishment of synonymies, as well as the generic and specific assignation of the specimens is not an easy task, due to the peculiar taphonomical context of this stratigraphic unit.</s0>
</fC01>
<fC02 i1="01" i2="2"><s0>001E01Q04</s0>
</fC02>
<fC02 i1="02" i2="2"><s0>001E01I</s0>
</fC02>
<fC02 i1="03" i2="2"><s0>227A04</s0>
</fC02>
<fC02 i1="04" i2="2"><s0>224A</s0>
</fC02>
<fC03 i1="01" i2="2" l="FRE"><s0>Xenarthra</s0>
<s2>NY</s2>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="ENG"><s0>Xenarthra</s0>
<s2>NY</s2>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="SPA"><s0>Xenarthra</s0>
<s2>NY</s2>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Biogéographie</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>biogeography</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="2" l="SPA"><s0>Biogeografía</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Paléobiogéographie</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>paleobiogeography</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Miocène sup</s0>
<s2>NX</s2>
<s5>05</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>upper Miocene</s0>
<s2>NX</s2>
<s5>05</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Mioceno sup</s0>
<s2>NX</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Ossement</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>bones</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Osamenta</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Biostratigraphie</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>biostratigraphy</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Bioestratigrafía</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Conglomérat</s0>
<s2>NV</s2>
<s5>10</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>conglomerate</s0>
<s2>NV</s2>
<s5>10</s5>
</fC03>
<fC03 i1="07" i2="2" l="SPA"><s0>Conglomerado</s0>
<s2>NV</s2>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="2" l="FRE"><s0>Unité stratigraphique</s0>
<s5>14</s5>
</fC03>
<fC03 i1="08" i2="2" l="ENG"><s0>stratigraphic units</s0>
<s5>14</s5>
</fC03>
<fC03 i1="08" i2="2" l="SPA"><s0>Unidad estratigráfica</s0>
<s5>14</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Taxinomie</s0>
<s5>15</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>taxonomy</s0>
<s5>15</s5>
</fC03>
<fC03 i1="09" i2="2" l="SPA"><s0>Taxonomía</s0>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="2" l="FRE"><s0>Province Entre Rios</s0>
<s4>INC</s4>
<s5>52</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Megalonychidae</s0>
<s4>INC</s4>
<s5>53</s5>
</fC03>
<fC03 i1="12" i2="2" l="FRE"><s0>Argentine</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="12" i2="2" l="ENG"><s0>Argentina</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="12" i2="2" l="SPA"><s0>Argentina</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE"><s0>Edentata</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>Edentata</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>Edentata</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Eutheria</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Eutheria</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="03" i2="2" l="FRE"><s0>Theria</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="03" i2="2" l="ENG"><s0>Theria</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="04" i2="2" l="FRE"><s0>Mammalia</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="04" i2="2" l="ENG"><s0>Mammalia</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="04" i2="2" l="SPA"><s0>Mammalia</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="05" i2="2" l="FRE"><s0>Tetrapoda</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="05" i2="2" l="ENG"><s0>Tetrapoda</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="05" i2="2" l="SPA"><s0>Tetrapoda</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="06" i2="2" l="FRE"><s0>Vertebrata</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="06" i2="2" l="ENG"><s0>Vertebrata</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="06" i2="2" l="SPA"><s0>Vertebrata</s0>
<s2>NY</s2>
</fC07>
<fC07 i1="07" i2="2" l="FRE"><s0>Chordata</s0>
</fC07>
<fC07 i1="07" i2="2" l="ENG"><s0>Chordata</s0>
</fC07>
<fC07 i1="07" i2="2" l="SPA"><s0>Chordata</s0>
</fC07>
<fC07 i1="08" i2="2" l="FRE"><s0>Miocène</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="08" i2="2" l="ENG"><s0>Miocene</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="08" i2="2" l="SPA"><s0>Mioceno</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="09" i2="2" l="FRE"><s0>Néogène</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="09" i2="2" l="ENG"><s0>Neogene</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="09" i2="2" l="SPA"><s0>Neógeno</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="10" i2="2" l="FRE"><s0>Tertiaire sup</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="10" i2="2" l="ENG"><s0>upper Tertiary</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="11" i2="2" l="FRE"><s0>Tertiaire</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="11" i2="2" l="ENG"><s0>Tertiary</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="11" i2="2" l="SPA"><s0>Terciario</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="12" i2="2" l="FRE"><s0>Cénozoïque</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="12" i2="2" l="ENG"><s0>Cenozoic</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="12" i2="2" l="SPA"><s0>Cenozoico</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="13" i2="2" l="FRE"><s0>Phanérozoïque</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="13" i2="2" l="ENG"><s0>Phanerozoic</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="13" i2="2" l="SPA"><s0>Fanerozoico</s0>
<s2>NX</s2>
</fC07>
<fC07 i1="14" i2="2" l="FRE"><s0>Roche clastique</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="14" i2="2" l="ENG"><s0>clastic rocks</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="14" i2="2" l="SPA"><s0>Roca clástica</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="15" i2="2" l="FRE"><s0>Roche sédimentaire</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="15" i2="2" l="ENG"><s0>sedimentary rocks</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="15" i2="2" l="SPA"><s0>Roca sedimentaria</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="16" i2="2" l="FRE"><s0>Amérique du Sud</s0>
<s2>564</s2>
</fC07>
<fC07 i1="16" i2="2" l="ENG"><s0>South America</s0>
<s2>564</s2>
</fC07>
<fC07 i1="16" i2="2" l="SPA"><s0>America del sur</s0>
<s2>564</s2>
</fC07>
<fN21><s1>150</s1>
</fN21>
</pA>
</standard>
<server><NO>PASCAL 11-0222345 INIST</NO>
<ET>The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Rios Province, Argentina, with remarks on their systematics and biogeography</ET>
<AU>BRANDONI (Diego)</AU>
<AF>Laboratorio de Paleontologia de Vertebrados, CICYTTP-CONICET, Materi y Espana, (3105) Diamante/Entre Rios/Argentine (1 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Geobios : (Lyon); ISSN 0016-6995; France; Da. 2011; Vol. 44; No. 1; Pp. 33-44; Abs. français/espagnol; Bibl. 1 p.3/4</SO>
<LA>Anglais</LA>
<EA>Megalonychidae are known from the Deseadan of Argentina and Bolivia to the present, represented by the tree sloth Choloepus Illiger. The principal fossil records of this clade are those from the Quaternary of Central America and the Antilles (e.g., Megalocnus Leidy, Acratocnus Anthony) and North America (e.g., Megalonyx Harlan, Pliometanastes Hirschfeld and Webb). From the Quaternary of South America, Megalonychidae are recorded in Peru (Diabolotherium Pujos, De luliis, Argot and Werdelin) and Brazil (e.g., Ahytherium Cartelle, De Iuliis and Pujos, Australonyx De Iuliis, Pujos and Cartelle). In Argentina they also have been recorded in the Santa Cruz Formation (early-middle Miocene) on the coast of Santa Cruz Province (Eucholaeops Ameghino), Arroyo Chasicó Formation (Protomegalonyx Kraglievich), Río Negro Formation, in the "conglomerado osífero" (ossiferous conglomerate) or "Mesopotamiense" (late Miocene) at the base of Ituzaingó Formation, Entre Ríos Province, and Pleistocene of Buenos Aires Province. Several authors have studied the Megalonychidae from the "conglomerado osífero", but no systematic revision of the group has been undertaken beyond the original naming of species. Taking into account that a broad range of individual variation has been observed in the Megalonychidae from the Pleistocene of North America and the West Indies, and that a similar range probably existed among the megalonychids from the "conglomerado osífero", then the number of valid species might be lower than previously proposed. Thus, the valid species recovered from the "conglomerado osífero" are Ortotherium laticurvatum Ameghino, Pliomorphus mutilatus Ameghino, Amphiocnus paranense Kraglievich, Protomegalonyx doellojuradoi Kraglievich, Pr. Praecursor Kraglievich, Megalonychops primigenius Kraglievich, and Paranabradys vucetichae Scillato-Yané. However, the establishment of synonymies, as well as the generic and specific assignation of the specimens is not an easy task, due to the peculiar taphonomical context of this stratigraphic unit.</EA>
<CC>001E01Q04; 001E01I; 227A04; 224A</CC>
<FD>Xenarthra; Biogéographie; Paléobiogéographie; Miocène sup; Ossement; Biostratigraphie; Conglomérat; Unité stratigraphique; Taxinomie; Province Entre Rios; Megalonychidae; Argentine</FD>
<FG>Edentata; Eutheria; Theria; Mammalia; Tetrapoda; Vertebrata; Chordata; Miocène; Néogène; Tertiaire sup; Tertiaire; Cénozoïque; Phanérozoïque; Roche clastique; Roche sédimentaire; Amérique du Sud</FG>
<ED>Xenarthra; biogeography; paleobiogeography; upper Miocene; bones; biostratigraphy; conglomerate; stratigraphic units; taxonomy; Argentina</ED>
<EG>Edentata; Eutheria; Theria; Mammalia; Tetrapoda; Vertebrata; Chordata; Miocene; Neogene; upper Tertiary; Tertiary; Cenozoic; Phanerozoic; clastic rocks; sedimentary rocks; South America</EG>
<SD>Xenarthra; Biogeografía; Mioceno sup; Osamenta; Bioestratigrafía; Conglomerado; Unidad estratigráfica; Taxonomía; Argentina</SD>
<LO>INIST-14199.354000193722270030</LO>
<ID>11-0222345</ID>
</server>
</inist>
</record>

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The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Rios Province, Argentina, with remarks on their systematics and biogeography

The Megalonychidae (Xenarthra, Tardigrada) from the late Miocene of Entre Rios Province, Argentina, with remarks on their systematics and biogeography

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