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The earliest record of pylochelid hermit crabs from the Late Jurassic of southern Poland, with notes on paguroid carapace terminology

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Fraaije R. H. B., Krzeminski W., Van Bakel B. W. M., Krzemiska E., Jagt J. W. M.

Acta Palaeontologica Polonica

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2012

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tom 57

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nr 3

Strata with cyanobacterial−sponge buildups of Middle to Late Oxfordian (Late Jurassic) age in the southern Polish Uplands document the earliest known members of the Pylochelidae. Two new Late Jurassic species of “symmetrical” hermit crabs, Ammopylocheles robertboreki and Jurapylocheles iwonae, are described. A new term, the massetic region, is introduced to describe the equivalent in paguroids of the hepatic region in brachyuran carapaces, because in the former, this region does not reflect the position of the liver but rather an attachment zone of the mandibular muscles.

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New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification

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Fraaije R. H. B., Krzeminski W., Van Bakel B. W. M., Krzeminska E., Jagt J. W. M.

Acta Palaeontologica Polonica

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2014

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tom 59

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nr 3

On the basis of carapaces, three new genera and species of symmetrical paguroid anomurans are described. Diogenicheles theodorae, Masticacheles longirostris, and Pilgrimcheles karolinae constitute the oldest known members of the family Parapylochelidae. As noted previously, assemblages from sponge−reefal strata of Oxfordian (Late Jurassic) age in the south− ern Polish Uplands document an important radiation event amongst paguroids. Compared to the present day, the Parapylochelidae were more diverse during the mid−Mesozoic; they appear to have withdrawn from shallow, reefal waters to deep−water settings from the Late Jurassic onwards. Paguroid faunas from the Oxfordian of Europe already are highly di− verse, both morphologically and phylogenetically, and comprise early members of the families Diogenidae, Pylochelidae, and Parapylochelidae. This suggests that the evolutionary history of paguroids started much earlier (i.e., in pre−Jurassic times) than previously assumed. New terms for several typical paguroid carapace regions are introduced and on the basis of carapace morphology and ecological shifts hypotheses on the early speciation of hermit crabs are put forward.

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The earliest record of a diogenid hermit crab from the Late Jurassic of the southern Polish Uplands, with notes on paguroid carapace terminology

88%

Fraaije R. H. B., Krzeminski W., Van Bakel B. W. M., Krzeminska E., Jagt J. W. M.

Acta Palaeontologica Polonica

|

2012

|

tom 57

|

nr 3

A new species of diogenid paguroid, Eopaguropsis nidiaquilae, the earliest known member of the family to date, is recorded from sponge−reefal strata of Oxfordian (Late Jurassic) age in the southern Polish Uplands. Morphological features of the carapace suggest that the family Diogenidae diverged from other paguroid lineages such as the Pylochelidae and Parapaguridae, long before the Oxfordian Stage (161.2–155.7 Ma). The typically deep, V−shaped cervical groove of diogenids most likely was the product of fusion of the branchiocardiac and cervical grooves of their predecessors.

Ograniczanie wyników

3 Acta Palaeontologica Polonica

3 Fraaije R. H. B.

3 Jagt J. W. M.

3 Krzeminski W.

3 Van Bakel B. W. M.

2 Krzeminska E.

1 Krzemiska E.

1 2014

2 2012

The earliest record of pylochelid hermit crabs from the Late Jurassic of southern Poland, with notes on paguroid carapace terminology

New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification

The earliest record of a diogenid hermit crab from the Late Jurassic of the southern Polish Uplands, with notes on paguroid carapace terminology