Archaeostracan (Phyllocarida: Archaeostraca) antennulae and antennae: sexual dimorphism in early malacostracans and Ceratiocaris M’Coy, 1849 as a possible stem eumalacostracan

Jones, Wade T.; Feldmann, Rodney M.; Mikulic, Donald G.

doi:10.1163/1937240x-00002328

Cited by 9 publications

(13 citation statements)

References 22 publications

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“…As N. stuertzi has the same relationship to crown Malacostraca as A. inflata (at least in the analysis of (Collette and Hagadorn, 2010b), neither fossil can be confidently placed within crown-group Malacostraca. Recent reinvestigation of Ceratiocaris suggests this Silurian 'phyllocarid' may be a stem eumalacostracan due to possession of an antennal scale, perhaps casting doubt on the monophyly of fossil phyllocarids (Jones et al, 2015). The Ceratiocaris study, however, assumes malacostracan identity of phyllocarids (partly defined by biramous antennules), which, as discussed above, may not be robust to phylogenetic analysis.…”

Section: Discussionmentioning

confidence: 99%

Fossil Calibrations for the Arthropod Tree of Life

Wolfe

Daley

Legg³

et al. 2016

Preprint

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Fossil age data and molecular sequences are increasingly combined to establish a timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically disparate animal phylum, have received substantial attention, particularly with regard to questions such as the timing of habitat shifts (e.g., terrestrialisation), genome evolution (e.g., gene family duplication and functional evolution), origins of novel characters and behaviours (e.g., wings and flight, venom, silk), biogeography, rate of diversification (e.g., Cambrian explosion, insect coevolution with angiosperms, evolution of crab body plans), and the evolution of arthropod microbiomes. We present herein a series of rigorously vetted calibration fossils for arthropod evolutionary history, taking into account recently published guidelines for best practice in fossil calibration. These are restricted to Palaeozoic and Mesozoic fossils, no deeper than ordinal taxonomic level, nonetheless resulting in 79 fossil calibrations for 101 clades. This work is especially timely owing to the rapid growth of molecular sequence data and the fact that many included fossils have been described within the last five years. This contribution provides a resource for systematists and other biologists interested in deep-time questions in arthropod evolution.

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Section: Discussionmentioning

confidence: 99%

Fossil Calibrations for the Arthropod Tree of Life

Wolfe

Daley

Legg³

et al. 2016

Preprint

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“…However, little in the way of other morphology can be discerned. Antennal morphology of C. macroura was described in detail by Jones et al (2015). The mandibles of UWGM 1923 occupy greater than half of the cephalic region ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Ceratiocarisfrom the Silurian Waukesha Biota, Wisconsin

2015

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Phyllocarids of the Waukesha Biota were systematically and taphonomically evaluated. Three Ceratiocaris species are present in the biota: C. macroura Collette and Rudkin, 2010; C. papilio Salter in Murchison, 1859; and C. pusilla Matthew, 1889. Specimens range in completeness from nearly complete, including the cephalic to caudal regions, to isolated telsons and furcae. Evidence of Salter's position is present in only three specimens. Relatively complete specimens are interpreted to represent corpses, rather than molts; whereas specimens including only the pleon and caudal region, or caudal region, and specimens with evidence of Salter's position likely represent exuviae. Specimens are preserved essentially as compression fossils exhibiting two types of preserved cuticle: brown inner cuticle, which tends to be impressed over the topography of bedding planes on which specimens are preserved, and blue-gray phosphatized cuticle exhibiting sub-millimeter scale relief. Cuticle phosphatization likely occurred during early diagenesis. The presence of characteristic near-shore species and C. pusilla, only known from turbidite facies, interpreted to possibly represent a marine trough, suggests that the Waukesha phyllocarid assemblage might represent a transported assemblage, rather than a biota, or that C. pusilla from the Jones Creek Formation was transported basinward in sediment gravity flows.

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“…It has also been discussed whether certain phyllocarid‐like fossils could represent either offshoots of the lineage towards Malacostraca or Eumalacostraca (Jones et al . ).…”

Section: Discussionmentioning

confidence: 97%

A crustacean with eumalacostracan affinities from the Early Devonian Hunsrück Slate (SW Germany)

Haug¹,

Poschmann

Hörnig

et al. 2016

Papers in Palaeontology

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We describe a new fossil crustacean from the famous Early Devonian Hunsrück Slate, Germany. Other crustacean fossils from this Lagerstätte are of the typical phyllocarid type. The new fossil genus and species Hohensteiniella engeli, represented by a single specimen, exhibits a typical shrimp‐like habitus. H. engeli therefore represents the first crustacean with eumalacostracan affinities from the Hunsrück Slate. Most prominently preserved is the biflagellate antennula, which measures about two‐thirds of the length of the main body. A series of stenopod‐like thoracopods enforce its shrimp‐like appearance. The head shield bears a short rostrum, but appears to have been rather short posteriorly. It remains unclear whether the new species forms an ingroup to Eumalacostraca or is its sister group, as certain key features are not preserved. Possible ingroup affinities may lie with the syncarid lineage (due to the short head shield) or decapod lineage (due to anterior thoracopods being shorter than posterior ones). Representatives of the eumalacostracan lineage are rare in the Devonian and are in most cases younger than H. engeli. Only Archangeliphausia spinosa is slightly older. The specimen of H. engeli is preserved associated with small spherical structures that could represent eggs. We discuss the possibility that H. engeli might have performed a type of parental care.

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Archaeostracan (Phyllocarida: Archaeostraca) antennulae and antennae: sexual dimorphism in early malacostracans and Ceratiocaris M’Coy, 1849 as a possible stem eumalacostracan

Cited by 9 publications

References 22 publications

Fossil Calibrations for the Arthropod Tree of Life

Fossil Calibrations for the Arthropod Tree of Life

Ceratiocarisfrom the Silurian Waukesha Biota, Wisconsin

A crustacean with eumalacostracan affinities from the Early Devonian Hunsrück Slate (SW Germany)

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