uu.seUppsala University Publications
Change search
Link to record
Permanent link

Direct link
BETA
Snitting, Daniel
Publications (10 of 12) Show all publications
Holland, T., Long, J. & Snitting, D. (2010). New information on the enigmatic tetrapodomorph fish Marsdenichthys longioccipitus (Long, 1985). Journal of Vertebrate Paleontology, 30(1), 68-77
Open this publication in new window or tab >>New information on the enigmatic tetrapodomorph fish Marsdenichthys longioccipitus (Long, 1985)
2010 (English)In: Journal of Vertebrate Paleontology, ISSN 0272-4634, E-ISSN 1937-2809, Vol. 30, no 1, p. 68-77Article in journal (Refereed) Published
Abstract [en]

The tetrapodomorph fish Marsdenichthys longioccipitus from the Givetian-Frasnian of Mt. Howitt, Victoria, Australia, occupies an uncertain phylogenetic position. Marsdenichthys has been linked to the base of the Tristichopteridae, as well as to the poorly known Northern Hemisphere form Rhizodopsis, based on the presence of rounded scales bearing a median boss on the internal surface. However, its affinities to these taxa are ambiguous, due to the incomplete preservation of the two Marsdenichthys specimens initially described. For the first time, we present significant information regarding the cheek and palate of Marsdenichthys, based on the descriptions of two new specimens from Mt. Howitt. New autapomorphies for Marsdenichthys are proposed, including the presence of a bar-like maxilla being approximately equal in depth to the dentary, and a rectangular anterior termination of the lacrimal. Several plesiomorphic features are described from the palate, including rounded vomer morphology lacking a posterior process, a relatively short, broad parasphenoid, and a dermopalatine approximately equal in length to the ectopterygoid. No synapomorphies are shared between Marsdenichthys and tristichopterids. Scale morphology is redescribed, and shown to exhibit concentric rings on the external surface, as in Rhizodopsis. However, differences in skull morphology, such as the lack of an external opening for the pineal foramen in Rhizodopsis, suggest that this scale morphology may have evolved independently.

National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-136412 (URN)10.1080/02724630903409105 (DOI)000278000400006 ()
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2017-12-11
Clément, G., Snitting, D. & Ahlberg, P. E. (2009). A new tristichopterid (Sarcopterygii, Tetrapodomorpha) from the Upper Famennian Evieux Formation (Upper Devonian) of Belgium. Palaeontology, 52, 823-836
Open this publication in new window or tab >>A new tristichopterid (Sarcopterygii, Tetrapodomorpha) from the Upper Famennian Evieux Formation (Upper Devonian) of Belgium
2009 (English)In: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 52, p. 823-836Article in journal (Refereed) Published
Abstract [en]

Additional material of a large specimen of tristichopterid fish from   the Upper Famennian Evieux Formation of Belgium is described. This   large fish was previously assigned to Tristichopteridae gen. et sp.   indet. due to the lack of diagnostic anatomical data. New available   material consists of the internal surface of the parietal shield,   vomers and anterior part of the parasphenoid, subopercular and   submandibulo-branchiostegal bones, and an internal view of the anterior  part of the mandible. A possible autapomorphy of the new form from   Belgium, Langlieria socqueti gen. nov. et sp. nov., is the absence of   marginal teeth on the vomer except on its most lateral part. Apart from   these features, it only differs from the genus Mandageria from   Australia in the absence of marginal teeth between the dentary fang and   the mandibular symphysis, in the presence of a raised marginal crest   lateral to the anterior coronoid fang, and in the presence of numerous   small marginal teeth on the premaxilla. It differs from the   cosmopolitan genus Eusthenodon in a number of respects: the   supratemporal, tabular, and postparietal bones are superficially fused,   as are the intertemporal and parietal bones, the dermal ornament is   proportionally very fine, and the denticulated field of the   parasphenoid stands proud rather than being recessed into the body of   the bone.

Keyword
Belgium, biogeography, Late Devonian, phylogeny, Tetrapodomorpha, Tristichopteridae
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-97004 (URN)10.1111/j.1475-4983.2009.00876.x (DOI)000268060800009 ()
Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2017-12-14
Snitting, D. & Blom, H. (2009). Correcting taxon names containing diacritics - examples from Paleozoic vertebrates. Journal of Vertebrate Paleontology, 29(1), 269-270
Open this publication in new window or tab >>Correcting taxon names containing diacritics - examples from Paleozoic vertebrates
2009 (English)In: Journal of Vertebrate Paleontology, ISSN 0272-4634, E-ISSN 1937-2809, Vol. 29, no 1, p. 269-270Article in journal (Refereed) Published
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-97005 (URN)000264900200021 ()
Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2017-12-14
Snitting, D. (2009). Heddleichthys - a new tristichopterid genus from the Dura Den Formation, Midland Valley, Scotland (Famennian, Late Devonian). Acta Zoologica (Stockholm), 90(Suppl. 1), 273-284
Open this publication in new window or tab >>Heddleichthys - a new tristichopterid genus from the Dura Den Formation, Midland Valley, Scotland (Famennian, Late Devonian)
2009 (English)In: Acta Zoologica (Stockholm), ISSN 0001-7272, E-ISSN 1463-6395, Vol. 90, no Suppl. 1, p. 273-284Article in journal (Refereed) Published
Abstract [en]

A new tristichopterid genus, Heddleichthys, from the Famennian of Scotland is described based on material previously assigned to a number of different genera, including Glyptopomus, Gyroptychius and Eusthenopteron. The validity of the new genus is established by a discussion of the reasons for the invalidity of the previous assignments. Heddleichthys is characterized by a combination of derived and primitive tristichopterid features. Derived features include the presence of symphyseal dentary fangs and premaxillary pseudofangs, a diamond-shaped symmetric caudal fin, a low posterodorsal expansion of the maxilla, and a posteriorly positioned kite-shaped pineal series. Primitive features include a postorbital and jugal contribution to the orbital margin and a parasphenoid with a ventral keel. External dermal bones are rather poorly preserved in the referred material, with few easily discernible sutures. The holotype specimen, a three-dimensionally preserved skull, was scanned by computed tomography to reveal well-preserved internal dermal bones, including entopterygoids, vomers and parasphenoid. There is no preserved endoskeletal material. As the first representative of derived tristichopterids described from Britain, Heddleichthys lends support to the idea that faunal dispersion between Gondwana and Laurussia in the Late Devonian was widespread. Derived tristichopterids have been described from all continents except South America. In contrast, the basal tristichopterids Eusthenopteron and Tristichopterus are still only described from Laurussia.

Keyword
Heddleichthys, Dura Den, Tristichopteridae, Famennian, Late Devonian
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-97002 (URN)10.1111/j.1463-6395.2008.00376.x (DOI)000266242000023 ()
Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2017-12-14Bibliographically approved
Snitting, D. (2008). A Redescription of the Anatomy of the Late Devonian Spodichthys Buetleri Jarvik, 1985 (Sarcopterygii, Tetrapodomorpha) from East Greenland. Journal of Vertebrate Paleontology, 28(3), 637-655
Open this publication in new window or tab >>A Redescription of the Anatomy of the Late Devonian Spodichthys Buetleri Jarvik, 1985 (Sarcopterygii, Tetrapodomorpha) from East Greenland
2008 (English)In: Journal of Vertebrate Paleontology, ISSN 0272-4634, E-ISSN 1937-2809, Vol. 28, no 3, p. 637-655Article in journal (Refereed) Published
Abstract [en]

The tetrapodomorph fish Spodichthys buetleri from the Upper Devonian of East Greenland is redescribed from computed tomography scans of material originally studied by Erik Jarvik. A wealth of new anatomical data was revealed by scanning the nearly perfectly three-dimensional specimens, including detailed information on the shape of the brain cavity and the internal structure of the lower jaws. Spodichthys displays an interesting mix of generalized “osteolepidid,” or primitive tetrapodomorph, and tristichopterid features. Derived characters shared by Spodichthys, tristichopterids and (Panderichthys + Tetrapoda) include the loss of cosmine, a small kite-shaped parasymphysial plate, and a long commissural lamina of the entopterygoid. The presence of an extratemporal lateral to the tabular and a single fang position on the posterior coronoid and ectopterygoid are examples of basal tetrapodomorph characters retained in Spodichthys. Spodichthys is unique in having coronoid fangs positioned lateral to the corresponding replacement pit rather than having an anterior-posterior alternation between developed fang and replacement pit, which is the normal tetrapodomorph condition. Jarvik's original conclusion that Spodichthys is closely related to the tristichopterids is confirmed by a phylogenetic analysis, which places Spodichthys as the sister taxon of the Tristichopteridae.

National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-97001 (URN)10.1671/0272-4634(2008)28[637:AROTAO]2.0.CO;2 (DOI)000259414500006 ()
Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2017-12-14
Blom, H. & Snitting, D. (2007). 40th Anniversary Symposium on Early Vertebrates/Lower Vertebrates Uppsala, Sweden. Post-conference field trip 17-20 August 2007 - Silurian of Gotland - Guidebook.
Open this publication in new window or tab >>40th Anniversary Symposium on Early Vertebrates/Lower Vertebrates Uppsala, Sweden. Post-conference field trip 17-20 August 2007 - Silurian of Gotland - Guidebook
2007 (Swedish)Other (Other (popular scientific, debate etc.))
Identifiers
urn:nbn:se:uu:diva-12784 (URN)
Available from: 2008-05-15 Created: 2008-05-15
Snitting, D. (2007). A redescription of the anatomy of Spodichthys buetleri Jarvik, 1985 (Sarcopterygii, Tetrapodomorpha). Ichthyolith Issues Special Publication 10
Open this publication in new window or tab >>A redescription of the anatomy of Spodichthys buetleri Jarvik, 1985 (Sarcopterygii, Tetrapodomorpha)
2007 (English)In: Ichthyolith Issues Special Publication 10Article in journal (Other scientific) Published
Identifiers
urn:nbn:se:uu:diva-11132 (URN)
Note
Conference abstractAvailable from: 2008-05-15 Created: 2008-05-15 Last updated: 2011-01-11
Snitting, D. (2007). Review - Swimming in Stone by John Long [Review]. Palaeontologica Electronica, 10(2)
Open this publication in new window or tab >>Review - Swimming in Stone by John Long
2007 (English)In: Palaeontologica Electronica, Vol. 10, no 2Article, book review (Other (popular scientific, debate etc.)) Published
Identifiers
urn:nbn:se:uu:diva-12820 (URN)
Note
BokrecensionAvailable from: 2008-01-16 Created: 2008-01-16 Last updated: 2011-01-11
Snitting, D. (2006). A redescription of the anatomy of Tristichopterus, with comments on the validity of Eusthenopteron and the monophyly of the Tristichopteridae. Journal of Vertebrate Paleontology, 26(3)
Open this publication in new window or tab >>A redescription of the anatomy of Tristichopterus, with comments on the validity of Eusthenopteron and the monophyly of the Tristichopteridae
2006 (English)In: Journal of Vertebrate Paleontology, Vol. 26, no 3Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-11133 (URN)
Note
Refereed conference abstractAvailable from: 2008-01-16 Created: 2008-01-16 Last updated: 2011-01-11
Snitting, D. (2005). An in-depth look at Spodichthys: Digital 3D reconstruction of a Devonian fish.. PaleoBios, 25(2 (supplement)), 109-110
Open this publication in new window or tab >>An in-depth look at Spodichthys: Digital 3D reconstruction of a Devonian fish.
2005 (English)In: PaleoBios, ISSN 0031-0298, Vol. 25, no 2 (supplement), p. 109-110Article in journal (Other scientific) Published
Keyword
palaeontology, vertebrate, sarcopterygian, osteolepiform, tristichopterid, Devonian, Spodichthys
National Category
Microbiology
Identifiers
urn:nbn:se:uu:diva-80835 (URN)
Note
Refereed conference abstract.Available from: 2006-06-05 Created: 2006-06-05 Last updated: 2011-01-12
Organisations

Search in DiVA

Show all publications