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{{Short description|Extinct genus of crustaceans}}
{{Italic title}}{{Taxobox
{{Speciesbox
⚫
| name = † ''Lepidocaris rhyniensis''
| fossil_range = {{fossil range|Middle Devonian}}
| fossil_range = {{fossil range|Pragian}}
| image = Lepidocaris rhyniensis.jpg
| regnum = [[Animal]]ia
| image_caption = Artist's restoration
| phylum = [[Arthropod]]a
| greatgrandparent_authority = [[D. J. Scourfield|Scourfield]], 1926
| subphylum = [[Crustacean|Crustacea]]
⚫
| grandparent_authority = Scourfield, 1926
| classis = [[Branchiopoda]]
⚫
| parent_authority = Scourfield, 1926
| subclassis = [[Phyllopoda]]
⚫
| taxon = Lepidocaris rhyniensis
| ordo = † '''Lipostraca'''
| ordo_authority = Scourfield, 1926
| authority = Scourfield, 1926
| familia = † '''Lepidocarididae'''
⚫
| familia_authority = Scourfield, 1926
| genus = † '''''Lepidocaris'''''
⚫
| genus_authority = Scourfield, 1926
| species = † '''''L. rhyniensis'''''
⚫
| binomial = † ''Lepidocaris rhyniensis''
| binomial_authority = Scourfield, 1926
}}
}}


'''''Lepidocaris rhyniensis''''' is an extinct species of [[crustacean]]. It is the only species known from the order '''Lipostraca''', and is the only abundant animal in the [[Rhynie chert]] desposits. It resembles modern [[Anostraca]], to which it is probably closely related, although its relationships to other orders remain unclear. The body is {{convert|3|mm|abbr=on}} long, with 23 body segments and 19 pairs of [[appendage]]s, but no [[carapace]]. It occurred chiefly among [[charophyte]]s, probably in alkaline [[vernal pool|temporary pools]].
'''''Lepidocaris rhyniensis''''' is an extinct species of [[crustacean]]. It is the only species known from the order '''Lipostraca''', and is the only abundant animal in the [[Pragian]]-aged [[Rhynie chert]] deposits. It resembles modern [[Anostraca]], to which it is probably closely related, although its relationships to other orders remain unclear. The body is {{convert|3|mm|abbr=on}} long, with 23 body segments and 19 pairs of [[appendage]]s, but no [[carapace]]. It occurred chiefly among [[charophyte]]s, probably in alkaline [[vernal pool|temporary pools]].


==Biostratigraphy and taxonomy==
==Biostratigraphy and taxonomy==
All the known specimens of ''Lepidocaris rhyniensis'' have been excavated from the [[Rhynie chert]] deposits in [[Aberdeenshire]], [[Scotland]], which is a famous ''{{lang|de|[[Lagerstätte]]}}'', or site of exceptional preservation. ''Lepidocaris'' is the only abundant animal in the deposits,<ref>{{cite web |url=http://www.ucmp.berkeley.edu/arthropoda/crustacea/branchiopoda.html |title=Introduction to Branchiopoda |publisher=[[University of California, Berkeley]] |accessdate=August 5, 2011}}</ref> and is likely to be responsible for many of the frequent [[coprolite]]s found in the rocks.<ref>{{cite journal |author=Nigel H Trewin, Stephen R Fayers & Ruth Kelman |year=2003 |title=Subaqueous silicification of the contents of small ponds in an Early Devonian hot-spring complex, Rhynie, Scotland |journal=[[Canadian Journal of Earth Sciences]] |volume=40 |issue=11 |pages=1697–1712 |doi=10.1139/e03-065 |bibcode=2003CaJES..40.1697T}}</ref>
All the known specimens of ''Lepidocaris rhyniensis'' have been excavated from the [[Rhynie chert]] deposits in [[Aberdeenshire]], [[Scotland]], which is a famous ''{{lang|de|[[Lagerstätte]]}}'', or site of exceptional preservation. ''Lepidocaris'' is the only abundant animal in the deposits,<ref>{{cite web |url=http://www.ucmp.berkeley.edu/arthropoda/crustacea/branchiopoda.html |title=Introduction to Branchiopoda |publisher=[[University of California, Berkeley]] |accessdate=August 5, 2011}}</ref> and is likely to be responsible for many of the frequent [[coprolite]]s found in the rocks.<ref>{{cite journal |author=Nigel H Trewin, Stephen R Fayers & Ruth Kelman |year=2003 |title=Subaqueous silicification of the contents of small ponds in an Early Devonian hot-spring complex, Rhynie, Scotland |journal=[[Canadian Journal of Earth Sciences]] |volume=40 |issue=11 |pages=1697–1712 |doi=10.1139/e03-065 |bibcode=2003CaJES..40.1697T}}</ref>


''Lepidocaris'' was [[alpha taxonomy|first described]] by [[David Joseph Scourfield|D. J. Scourfield]] in a 1926 paper in the ''[[Philosophical Transactions of the Royal Society B: Biological Sciences|Philosophical Transactions of the Royal Society B]]''.<ref name="Selden">{{cite book |author=Paul Selden & John R. Nudds |year=2004 |title=Evolution of Fossil Ecosystems |edition=2nd |publisher=[[Manson Publishing]] |isbn=9781840760415 |chapter=The Rhynie Chert |pages=47–58 |url=http://books.google.co.uk/books?id=caNHa2Ad604C&pg=PA55}}</ref> Scourfield could not accommodate his new genus in the same [[order (biology)|order]] as its closest relatives – the [[Anostraca]] – so he erected a new [[family (biology)|family]] and order for ''Lepidocaris'' alone: Lepidocarididae and Lipostraca, respectively.<ref name="Scourfield_1926">{{cite journal |author=D. J. Scourfield |year=1926 |title=On a new type of crustacean from the old Red Sandstone (Rhynie chert Bed, Aberdeenshire) – ''Lepidocaris rhyniensis'', gen. et sp. nov. |journal=[[Philosophical Transactions of the Royal Society B: Biological Sciences]] |volume=214 |pages=153–187 |jstor=92140 |doi=10.1098/rstb.1926.0005}}</ref> Until 2003, when ''[[Castracollis]]'' was described, ''Lepidocaris'' was the only crustacean known from the Rhynie chert.<ref>{{cite journal |author=Jørgen Olesen |year=2009 |title=Phylogeny of Branchiopoda (Crustacea) – character evolution and contribution of uniquely preserved fossils |journal=[[Arthropod Systematics & Phylogeny]] |volume=67 |issue=1 |pages=3–39 |url=http://www.arthropod-systematics.de/ASP_67_1/ASP_67_1_Olesen_3-39.pdf |format=[[Portable Document Format|PDF]]}}</ref>
''Lepidocaris'' was [[alpha taxonomy|first described]] by [[David Joseph Scourfield|D. J. Scourfield]] in a 1926 paper in the ''[[Philosophical Transactions of the Royal Society B: Biological Sciences|Philosophical Transactions of the Royal Society B]]''.<ref name="Selden">{{cite book |author=Paul Selden & John R. Nudds |year=2004 |title=Evolution of Fossil Ecosystems |edition=2nd |publisher=[[Manson Publishing]] |isbn=978-1-84076-041-5 |chapter=The Rhynie Chert |pages=47–58 |chapter-url=https://books.google.com/books?id=caNHa2Ad604C&pg=PA55}}</ref> Scourfield could not accommodate his new genus in the same [[order (biology)|order]] as its closest relatives – the [[Anostraca]] – so he erected a new [[family (biology)|family]] and order for ''Lepidocaris'' alone: Lepidocarididae and Lipostraca, respectively.<ref name="Scourfield_1926">{{cite journal |author=D. J. Scourfield |year=1926 |title=On a new type of crustacean from the old Red Sandstone (Rhynie chert Bed, Aberdeenshire) – ''Lepidocaris rhyniensis'', gen. et sp. nov. |journal=[[Philosophical Transactions of the Royal Society B: Biological Sciences]] |volume=214 |issue=411–420 |pages=153–187 |jstor=92140 |doi=10.1098/rstb.1926.0005|bibcode=1926RSPTB.214..153S |doi-access=free }}</ref> Until 2003, when ''[[Castracollis]]'' was described, ''Lepidocaris'' was the only crustacean known from the Rhynie chert.<ref>{{cite journal |author=Jørgen Olesen |year=2009 |title=Phylogeny of Branchiopoda (Crustacea) – character evolution and contribution of uniquely preserved fossils |journal=[[Arthropod Systematics & Phylogeny]] |volume=67 |issue=1 |pages=3–39 |url=http://www.arthropod-systematics.de/ASP_67_1/ASP_67_1_Olesen_3-39.pdf |access-date=2011-08-06 |archive-url=https://web.archive.org/web/20120321190322/http://www.arthropod-systematics.de/ASP_67_1/ASP_67_1_Olesen_3-39.pdf |archive-date=2012-03-21 |url-status=dead }}</ref><ref>{{cite web|url=https://www.abdn.ac.uk/rhynie/castracoll.htm|title=Castracollis|publisher=[[University of Aberdeen]]|access-date=2020-05-26|quote=This is the first new crustacean described from the chert since Lepidocaris rhyniensis (Scourfield 1926, 1940c).}}</ref>


==Description==
==Description==
[[File:Artemia salina 3.jpg|thumb|left|''Lepidocaris'' may have resembled ''[[Artemia salina]]'' both morphologically and ecologically.]]
[[File:Artemia salina 3.jpg|thumb|left|''Lepidocaris'' may have resembled ''[[Artemia salina]]'' both morphologically and ecologically.]]
''Lepidocaris rhyniensis'' is a [[segmentation|segmented animal]] with 23 body segments.<ref name="Khanna">{{cite book |author=D. R. Khanna |year=2004 |title=Biology of Arthropoda |publisher=[[Discovery Publishing House]] |isbn=9788171418978 |chapter=Segmentation in arthropods |pages=316–394 |url=http://books.google.co.uk/books?id=Hd4OEDo4gbwC&pg=PA347}}</ref> The whole body measures around {{convert|3|mm}} long.<ref name="Scourfield_1926"/> The head two pairs of [[antenna (biology)|antennae]], the second of which is used for swimming.<ref name="Khanna"/> As in Anostraca, there is no [[carapace]].<ref name="Khanna"/> There are eleven pairs of [[appendages]] on the thorax and abdomen, of which the first eight pairs are similar to the swimming limbs of [[copepod]]s, while the last three pairs are ''phyllopodia'', or leaf-like limbs, as seen in other branchiopods such as ''[[Triops]]''.<ref name="Khanna"/> The tail ends in a pair of caudal furcae.<ref name="abdn"/>
''Lepidocaris rhyniensis'' is a [[segmentation (biology)|segmented animal]] with 23 body segments.<ref name="Khanna">{{cite book |author=D. R. Khanna |year=2004 |title=Biology of Arthropoda |publisher=[[Discovery Publishing House]] |isbn=978-81-7141-897-8 |chapter=Segmentation in arthropods |pages=316–394 |chapter-url=https://books.google.com/books?id=Hd4OEDo4gbwC&pg=PA347}}</ref> The whole body measures around {{convert|3|mm}} long.<ref name="Scourfield_1926"/> The head has two pairs of [[antenna (biology)|antennae]], the second of which is used for swimming.<ref name="Khanna"/> As in Anostraca, there is no [[carapace]].<ref name="Khanna"/> There are eleven pairs of [[appendages]] on the thorax and abdomen, of which the first three pairs are ''phyllopodia'', or leaf-like limbs, as seen in other branchiopods such as ''[[Triops]]'', while the last eight pairs are similar to the swimming limbs of [[copepod]]s.<ref name="Khanna"/> The tail ends in a pair of caudal furcae.<ref name="abdn"/>


==Ecology==
==Ecology==
[[File:NitellaMeadow.jpg|thumb|A modern ''[[Nitella]]'' meadow, seen from above; ''Lepidocaris'' is likely to have inhabited a similar habitat in the [[Devonian]].]]
[[File:NitellaMeadow.jpg|thumb|A modern ''[[Nitella]]'' meadow, seen from above; ''Lepidocaris'' is likely to have inhabited a similar habitat in the [[Devonian]].]]
''Lepidocaris'' is one of the earliest preserved [[fresh water|freshwater]] crustaceans.<ref name="abdn">{{cite web |url=http://www.abdn.ac.uk/rhynie/lepid.htm |title=''Lepidocaris'' |publisher=[[University of Aberdeen]] |work=The Rhynie Chert Crustaceans |accessdate=August 5, 2011}}</ref> It is frequently found in association with the [[Charophyta|charophyte]] ''[[Palaeonitella]]'' ([[Characeae]]); if the ecology of ''Palaeonitella'' resembled that of its modern relatives, the water would have been [[Alkalinity|alkaline]].<ref name="abdn"/> Similarly, ''Lepidocaris'' is thought to have had a similar ecology to extant members of the [[Anostraca]], such as ''[[Artemia]]'', inhabiting shallow, [[vernal pool|temporary pools]].<ref name="abdn"/>
''Lepidocaris'' is one of the earliest preserved [[fresh water|freshwater]] crustaceans.<ref name="abdn">{{cite web |url=http://www.abdn.ac.uk/rhynie/lepid.htm |title=''Lepidocaris'' |publisher=[[University of Aberdeen]] |work=The Rhynie Chert Crustaceans |accessdate=August 5, 2011}}</ref> It is frequently found in association with the [[Charophyta|charophyte]] ''[[Palaeonitella]]'' ([[Characeae]]); if the ecology of ''Palaeonitella'' resembled that of its modern relatives, the water would have been [[Alkalinity|alkaline]].<ref name="abdn"/> Similarly, ''Lepidocaris'' is thought to have had a similar ecology to extant members of the [[Anostraca]] and the [[Notostraca]] such as ''[[Artemia]]'' and ''Triops'', inhabiting shallow, [[vernal pool|temporary pools]].<ref name="abdn"/>


==Relationships==
==Relationships==
The phylogenetic position of ''Lepidocaris'' in relation to other orders of crustaceans is uncertain.<ref name="Schram_Koenemann"/> In his original description of the species, Scourfield noted that ''Lepidocaris'' could not be accommodated in the existing order [[Anostraca]], and even suggested that a position outside the [[Branchiopoda]] was not unthinkable.<ref name="Scourfield_1926"/> In 1986, [[Frederick Schram]] considered Lipostraca to be the [[sister group]] to Brachypoda, with the two orders together making up the [[Cephalocarida]].<ref>{{cite book |editor=[[Richard A. Fortey]] & Richard H. Thomas |year=1998 |title=Arthropod Relationships |volume=55 |series=Systematics Association special volume |publisher=[[Springer Science+Business Media|Springer]] |isbn=9780412754203 |chapter=A phylogeny of recent and fossil Crustacea derived from morphological characters |author=M. A. Wills |pages=189–209 |url=http://books.google.co.uk/books?id=Pj-q9eHyIx0C&pg=PA195}}</ref> In 1997, Dieter Walossek considered ''Lepidocaris'' and ''[[Rehbachiella]]'' to be [[stem-group]] anostracans, outside the extant Euanostraca.<ref name="Schram_Koenemann">{{cite journal |author=[[Frederick R. Schram]] & Stefan Koenemann |year=2001 |title=Developmental genetics and arthropod evolution: part I, on legs |journal=[[Evolution & Development]] |volume= 3 |issue=5 |pages=343–354 |doi=10.1046/j.1525-142X.2001.01038.x |pmid=11710766}}</ref> In 2001, Schram and Koenemann considered ''Lepidocaris'' and ''Rehbachiella'' to be stem-group lineages basal to the whole [[Branchiopoda]].<ref name="Schram_Koenemann"/>
The phylogenetic position of ''Lepidocaris'' in relation to other orders of crustaceans is uncertain.<ref name="Schram_Koenemann"/> In his original description of the species, Scourfield noted that ''Lepidocaris'' could not be accommodated in the existing order [[Anostraca]], and even suggested that a position outside the [[Branchiopoda]] was not unthinkable.<ref name="Scourfield_1926"/> In 1986, [[Frederick Schram]] considered Lipostraca to be the [[sister group]] to Brachypoda, with the two orders together making up the [[Cephalocarida]].<ref>{{cite book |editor=[[Richard A. Fortey]] & Richard H. Thomas |year=1998 |title=Arthropod Relationships |volume=55 |series=Systematics Association special volume |publisher=[[Springer Science+Business Media|Springer]] |isbn=978-0-412-75420-3 |chapter=A phylogeny of recent and fossil Crustacea derived from morphological characters |author=M. A. Wills |pages=189–209 |chapter-url=https://books.google.com/books?id=Pj-q9eHyIx0C&pg=PA195}}</ref> In 1997, Dieter Walossek considered ''Lepidocaris'' and ''[[Rehbachiella]]'' to be [[stem-group]] anostracans, outside the extant Euanostraca.<ref name="Schram_Koenemann">{{cite journal |author=[[Frederick R. Schram]] & Stefan Koenemann |year=2001 |title=Developmental genetics and arthropod evolution: part I, on legs |journal=[[Evolution & Development]] |volume= 3 |issue=5 |pages=343–354 |doi=10.1046/j.1525-142X.2001.01038.x |pmid=11710766|s2cid=25997101 }}</ref> In 2001, Schram and Koenemann considered ''Lepidocaris'' and ''Rehbachiella'' to be stem-group lineages basal to the whole [[Branchiopoda]].<ref name="Schram_Koenemann"/>


==References==
==References==
{{reflist|32em}}
{{Reflist|32em}}


==Further reading==
==Further reading==
Line 43: Line 36:
*{{cite journal |author=D. J. Scourfield |year=1940 |title=Two new and nearly complete specimens of young stages of the Devonian fossil crustacean ''Lepidocaris rhyniensis'' |journal=[[Proceedings of the Linnean Society of London]] |volume=152 |issue=3 |pages=290–298 |doi=10.1111/j.1095-8312.1940.tb00265.x}}
*{{cite journal |author=D. J. Scourfield |year=1940 |title=Two new and nearly complete specimens of young stages of the Devonian fossil crustacean ''Lepidocaris rhyniensis'' |journal=[[Proceedings of the Linnean Society of London]] |volume=152 |issue=3 |pages=290–298 |doi=10.1111/j.1095-8312.1940.tb00265.x}}


{{Taxonbar|from=Q6527441}}
[[Category:Branchiopoda]]

⚫
[[Category:Devonian animals]]
[[Category:Monotypic arthropod genera]]
[[Category:Monotypic Branchiopoda genera]]
[[Category:Prehistoric crustacean genera]]
⚫
[[Category:Devonian animals of Europe]]
[[Category:Fossil taxa described in 1926]]

Latest revision as of 20:10, 19 August 2024

Lepidocaris
Temporal range: Pragian
↓
Artist's restoration
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Branchiopoda
Order: †Lipostraca
Scourfield, 1926
Family: †Lepidocarididae
Scourfield, 1926
Genus: †Lepidocaris
Scourfield, 1926
Species:
†L. rhyniensis
Binomial name
†Lepidocaris rhyniensis
Scourfield, 1926

Lepidocaris rhyniensis is an extinct species of crustacean. It is the only species known from the order Lipostraca, and is the only abundant animal in the Pragian-aged Rhynie chert deposits. It resembles modern Anostraca, to which it is probably closely related, although its relationships to other orders remain unclear. The body is 3 mm (0.12 in) long, with 23 body segments and 19 pairs of appendages, but no carapace. It occurred chiefly among charophytes, probably in alkaline temporary pools.

Biostratigraphy and taxonomy

[edit]

All the known specimens of Lepidocaris rhyniensis have been excavated from the Rhynie chert deposits in Aberdeenshire, Scotland, which is a famous Lagerstätte, or site of exceptional preservation. Lepidocaris is the only abundant animal in the deposits,[1] and is likely to be responsible for many of the frequent coprolites found in the rocks.[2]

Lepidocaris was first described by D. J. Scourfield in a 1926 paper in the Philosophical Transactions of the Royal Society B.[3] Scourfield could not accommodate his new genus in the same order as its closest relatives – the Anostraca – so he erected a new family and order for Lepidocaris alone: Lepidocarididae and Lipostraca, respectively.[4] Until 2003, when Castracollis was described, Lepidocaris was the only crustacean known from the Rhynie chert.[5][6]

Description

[edit]
Lepidocaris may have resembled Artemia salina both morphologically and ecologically.

Lepidocaris rhyniensis is a segmented animal with 23 body segments.[7] The whole body measures around 3 millimetres (0.12 in) long.[4] The head has two pairs of antennae, the second of which is used for swimming.[7] As in Anostraca, there is no carapace.[7] There are eleven pairs of appendages on the thorax and abdomen, of which the first three pairs are phyllopodia, or leaf-like limbs, as seen in other branchiopods such as Triops, while the last eight pairs are similar to the swimming limbs of copepods.[7] The tail ends in a pair of caudal furcae.[8]

Ecology

[edit]
A modern Nitella meadow, seen from above; Lepidocaris is likely to have inhabited a similar habitat in the Devonian.

Lepidocaris is one of the earliest preserved freshwater crustaceans.[8] It is frequently found in association with the charophyte Palaeonitella (Characeae); if the ecology of Palaeonitella resembled that of its modern relatives, the water would have been alkaline.[8] Similarly, Lepidocaris is thought to have had a similar ecology to extant members of the Anostraca and the Notostraca such as Artemia and Triops, inhabiting shallow, temporary pools.[8]

Relationships

[edit]

The phylogenetic position of Lepidocaris in relation to other orders of crustaceans is uncertain.[9] In his original description of the species, Scourfield noted that Lepidocaris could not be accommodated in the existing order Anostraca, and even suggested that a position outside the Branchiopoda was not unthinkable.[4] In 1986, Frederick Schram considered Lipostraca to be the sister group to Brachypoda, with the two orders together making up the Cephalocarida.[10] In 1997, Dieter Walossek considered Lepidocaris and Rehbachiella to be stem-group anostracans, outside the extant Euanostraca.[9] In 2001, Schram and Koenemann considered Lepidocaris and Rehbachiella to be stem-group lineages basal to the whole Branchiopoda.[9]

References

[edit]
  1. ^ "Introduction to Branchiopoda". University of California, Berkeley. Retrieved August 5, 2011.
  2. ^ Nigel H Trewin, Stephen R Fayers & Ruth Kelman (2003). "Subaqueous silicification of the contents of small ponds in an Early Devonian hot-spring complex, Rhynie, Scotland". Canadian Journal of Earth Sciences. 40 (11): 1697–1712. Bibcode:2003CaJES..40.1697T. doi:10.1139/e03-065.
  3. ^ Paul Selden & John R. Nudds (2004). "The Rhynie Chert". Evolution of Fossil Ecosystems (2nd ed.). Manson Publishing. pp. 47–58. ISBN 978-1-84076-041-5.
  4. ^ a b c D. J. Scourfield (1926). "On a new type of crustacean from the old Red Sandstone (Rhynie chert Bed, Aberdeenshire) – Lepidocaris rhyniensis, gen. et sp. nov". Philosophical Transactions of the Royal Society B: Biological Sciences. 214 (411–420): 153–187. Bibcode:1926RSPTB.214..153S. doi:10.1098/rstb.1926.0005. JSTOR 92140.
  5. ^ Jørgen Olesen (2009). "Phylogeny of Branchiopoda (Crustacea) – character evolution and contribution of uniquely preserved fossils" (PDF). Arthropod Systematics & Phylogeny. 67 (1): 3–39. Archived from the original (PDF) on 2012-03-21. Retrieved 2011-08-06.
  6. ^ "Castracollis". University of Aberdeen. Retrieved 2020-05-26. This is the first new crustacean described from the chert since Lepidocaris rhyniensis (Scourfield 1926, 1940c).
  7. ^ a b c d D. R. Khanna (2004). "Segmentation in arthropods". Biology of Arthropoda. Discovery Publishing House. pp. 316–394. ISBN 978-81-7141-897-8.
  8. ^ a b c d "Lepidocaris". The Rhynie Chert Crustaceans. University of Aberdeen. Retrieved August 5, 2011.
  9. ^ a b c Frederick R. Schram & Stefan Koenemann (2001). "Developmental genetics and arthropod evolution: part I, on legs". Evolution & Development. 3 (5): 343–354. doi:10.1046/j.1525-142X.2001.01038.x. PMID 11710766. S2CID 25997101.
  10. ^ M. A. Wills (1998). "A phylogeny of recent and fossil Crustacea derived from morphological characters". In Richard A. Fortey & Richard H. Thomas (ed.). Arthropod Relationships. Systematics Association special volume. Vol. 55. Springer. pp. 189–209. ISBN 978-0-412-75420-3.

Further reading

[edit]
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