A Monograph of the Fossil Macrurous Crustacea of England. Part II. Pages 17–40; Plates V–VIII

Woods, Henry

doi:10.1080/02693445.1925.12035594

Cited by 9 publications

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“…Chelae are variable, to some extent even within individuals (Förster 1966; see also Woods 1928). But with its untypically slender form and the absence of teeth on the occlusal surfaces, this specimen cannot be assigned to any of the above mentioned Eryma species.…”

Section: Systematic Descriptionsmentioning

confidence: 96%

“…laevis (BLAKE) and A. marderi WOODWARD, both from the Lower Jurassic of southern England, have much more pronounced cervical, hepatical and branchiocardiac grooves (Woods 1922;Förster & Crane 1984). This is also the case in A. brevirostris VAN STRAELEN from the Callovian of La Voulte, France (Carriol & Riou 1991).…”

Section: Systematic Descriptionsmentioning

confidence: 99%

“…One additional character of the first pereiopod that might be important is the form of the dactylus. The dactylus is hooked near its base only in some species of Glyphea but not in Pseudoglyphea (see Woods 1924Woods , 1925Glaessner 1969). Based on its similarities with G. solitaria and the hooked dactylus, specimen 6101 is therefore assigned to Glyphea sp., but it cannot be excluded that it could belong to Pseudoglyphea sp.…”

Section: Systematic Descriptionsmentioning

confidence: 99%

“…The finely sculptured M. clypeatus (CARTER) from the Bathonian of southern England and the more coarsely sculptured M. socialis (VON MEYER) from the Callovian-Oxfordian of Germany, France and southern England differ from the Opalinus Clay specimens by the absence of an antennal crista and of the upper gastrical crista (Woods 1926;Förster 1971). In addition, the propodus: dactylus ratio of the first pereiopod is around 1.7 in M. clypeatus and M. socialis whereas this ratio is 1.1-1.2 in M. eckerti (see Frentzen 1937) and in the Opalinus Clay specimens.…”

Section: Systematic Descriptionsmentioning

confidence: 99%

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Decapod crustaceans from the Middle Jurassic Opalinus Clay of northern Switzerland, with comments on crustacean taphonomy

Etter

2004

Eclogae geol. Helv.

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Four species of decapod crustaceans from the Middle Jurassic Opalinus Clay (Aalenian) of Northern Switzerland are described. Of these, Mecochirus cf. eckerti is the most common one, while Eryma cf. bedelta, Glyphea sp. and Aeger sp. were present as individuals, or only a few specimens. The preservation of these crustaceans ranges from moderate to excellent, reflecting the favourable taphonomic conditions of the depositional environment. An interesting aspect of the taphocoenosis in the Opalinus Clay is that the decapod crustaceans are by far outnumbered by small peracarid crustaceans (isopods and tanaids). This is interpreted as reflecting the original differences in abundance. Yet this distribution is not frequently encountered in sedimentary sequences where decapods (although rare) are far more common than isopods and tanaids. In rare instances, this reflects the original predominance of decapods, more often it is a consequence of the differential taphonomic behaviour of these two groups. A new model relating the ecology to the taphonomic behaviour of decapod and peracarid crustaceans is proposed. According to this model, decapods dominate in settings that were deposited under extremely dysoxic (peracarids wiped out by seasonal anoxia) as well as under fully oxic conditions (peracarids destroyed by taphonomic processes). Only in muddy dysoxic depositional environments are peracarid crustaceans frequently preserved. In these settings with equal preservation potential of decapods and peracarids, the original composition of the crustacean fauna would show a predominance of peracarid crustaceans. Examples from some well known fossiliferous settings are provided to illustrate the use of the new model. ZUSAMMENFASSUNGAus dem Opalinuston (Mittlerer Jura, Aalenian) der Nordschweiz werden vier Arten von decapoden Krebsen beschrieben. Von Aeger sp., Eryma cf. bedelta und Glyphaea sp. wurden nur ganz wenige Exemplaren gefunden, während Mecochirus cf. eckerti etwas häufiger ist. Die Erhaltungsbedingungen waren während der Ablagerung des Opalinustones günstig, was sich in einer geringen Disartikulations-und Fragmentationsrate der Krebse widerspiegelt. Ein interessanter Aspekt der Taphocoenose ist die deutliche Dominanz der Kleinkrebse (Peracarida: Isopoden und Tanaidaceen). Dies dürfte die Zahlenverhältnisse der ehemaligen Lebensgemeinschaft widerspiegeln. In den meisten Ablagerungen dominieren jedoch die decapoden Krebse, wogegen Peracarida äusserst selten sind. Nur in den wenigsten Fällen entspricht dies einem ursprünglichen Überwiegen der Decapoda, viel öfter ist es eine Folge des unterschiedlichen Fossilisationspotentials der beiden Gruppen. Hier wird ein neues Modell vorgeschlagen, welches Ökologie und taphonomisches Verhalten der decapoden und peracariden Krebse miteinander verknüpft. Nach diesem Modell dominieren die Decapoda in Ablagerungen, welche in stark dysoxischem (Peracarida werden durch anoxische Ereignisse ausgelöscht) oder in vollkommen oxischem Milieu (Peracarida werden durch taphonomische Prozesse zerstör...

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Section: Systematic Descriptionsmentioning

confidence: 96%

Section: Systematic Descriptionsmentioning

confidence: 99%

Section: Systematic Descriptionsmentioning

confidence: 99%

Section: Systematic Descriptionsmentioning

confidence: 99%

See 2 more Smart Citations

Decapod crustaceans from the Middle Jurassic Opalinus Clay of northern Switzerland, with comments on crustacean taphonomy

Etter

2004

Eclogae geol. Helv.

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“…This name was used by Aguirre-Urreta (1989: 534), Garassino (1996: 352-354) and Garassino and Schweigert (2006: 20), and, if regarded as a separate taxon, it should be replaced (see discussion in Feldmann and Schweitzer 2006 Synonyms. See van Straelen 1924; Woods 1927 andGlaessner 1929).…”

Section: Systematic Descriptionmentioning

confidence: 99%

New early Jurassic decapod crustacean from Patagonia (Chubut province), Argentina

et al. 2010

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A well-preserved decapod specimen was found in early Toarcian deposits cropping out on the western slope of Meseta Catreleo, central Chubut province, Argentina. It is a nearly complete exoskeleton preserved in lateral view, slightly crushed, in fine-grained sandstones. The skeleton is mostly articulated, though some pieces are disarticulated or missing. Taphonomic features indicate a relatively rapid burial after death, with little or no transport. This specimen is here described as a new species of the genus Mecochirus Germar (Decapoda: Glypheoidea). Mecochirus robbianoi n. sp. is characterized by a very long, achelate, first pair of pereiopods with a narrow, long, straight dactylus, a thin carapace ornamented by low tubercules, with a slightly oblique cervical groove and a short acute rostrum. The family Mecochiridae arose in the Triassic, but the group diversified during the Early Jurassic. Mecochirus had a wide geographical distribution and is known for sure from Lower Jurassic to Upper Cretaceous deposits. The new record from Chubut is one of the oldest for the genus, the oldest for South America, and the first for Argentina, thus considerably extending the known distribution of the genus during the Early Jurassic.Kurzfassung Ein gut erhaltener Decapode wurde in Ablagerungen des unteren Toarciums auf der Westseite der Meseta Catreleo im Zentrum der Provinz Chubut (Argentinien) gefunden. Es handelt sich um ein fast komplett erhaltenes Exoskelett, welches in einem feinkörnigem Sandstein leicht verdrück in Seitenlage eingebettet ist. Die taphonomische Analyse deutet auf eine rasche Einbettung nach dem Tod, mit nur geringem oder fehlendem Transport. Das hier beschriebene Exemplar wird als neue Art der Gattung Mecochirus Germar (Decapoda: Glypheoidea), M. robbianoi n. sp., beschrieben. Sie zeichnet sich durch ein sehr langes, achelates Paar der ersten Pereiopoden mit schmalen, langem, geradem Daktylus, einem mit flachen Tuberkeln verzierten Carpax mit leicht gerundeter Cervicalfurche und ein kurzes, spitzes Rostrum aus. Die Familie Mecochiridae erschien in der Trias; im Unterjura kam es zu einer Diversifikation. Mecochirus hatte eine weite paläo-geographische Verbreitung und ist vom Unterjura bis in die Oberkreide mit Sicherheit bekannt. Die neue Art ist eine der ältesten der Gattung, die älteste aus Südamerika und zugleich der erstnachweis aus Argentinien. Dies weist auf eine viel größere Verbreitung im Unterjura hin als bisher angenommen.Schlü sselwörter Decapoda Á Glypheoidea Á Mecochirus Á Unter Jura Á Patagonia Á Chubut Á Argentina

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Cretaceous – Tertiary Hoploparia species: Occurrence, paleobiogeography and predation context

El-Shazly

2015

Journal of African Earth Sciences

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A Monograph of the Fossil Macrurous Crustacea of England. Part II. Pages 17–40; Plates V–VIII

Cited by 9 publications

References 0 publications

Decapod crustaceans from the Middle Jurassic Opalinus Clay of northern Switzerland, with comments on crustacean taphonomy

Decapod crustaceans from the Middle Jurassic Opalinus Clay of northern Switzerland, with comments on crustacean taphonomy

New early Jurassic decapod crustacean from Patagonia (Chubut province), Argentina

Cretaceous – Tertiary Hoploparia species: Occurrence, paleobiogeography and predation context

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