sábado, 25 de setembro de 2010

Cetiosaurus Owen, 1841 (Dinosauria, Sauropoda): proposed conservation of usage by designation of Cetiosaurus oxoniensis Phillips, 1871 as the type species Paul Upchurch Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, U.K. (e-mail: p.upchurch@ucl.ac.uk)
John Martin 6 The Nook, Great Glen, Leicester LE8 9GQ, U.K.
(e-mail: Johnmartin424@aol.com)
Michael P. Taylor
Palaeobiology Research Group, School of Earth & Environmental Sciences, Burnaby Building, Burnaby Road, University of Portsmouth, Portsmouth, PO1 3QL, U.K. (e-mail: dino@miketaylor.org.uk)
Abstract. The purpose of this application, under Article 81.1 of the Code, is to preserve stability in the taxonomy of sauropod dinosaurs by designating Cetiosaurus oxoniensis as the type species of Cetiosaurus. The genus Cetiosaurus (including the species C. medius and C. oxoniensis) was established during the earliest period of research on sauropod dinosaurs, and is historically significant. The name Cetiosaurus was fixed to the type species Cetiosaurus medius, a sauropod of indeterminate affinities; however, the fragmentary nature of the type material of C. medius,
combined with the subsequent description of much more complete Middle Jurassic
sauropod material as Cetiosaurus oxoniensis, has meant that subsequent literature has
overwhelmingly adopted C. oxoniensis over C. medius as the primary exemplar of
Cetiosaurus. Stability would be best served by designating Cetiosaurus oxoniensis
as the type species of the genus Cetiosaurus in place of the current type species,
C. medius.

Keywords. Nomenclature; taxonomy; Dinosauria; Sauropoda; CETIOSAURIDAE;
Cetiosaurus; Cetiosaurus oxoniensis; Cetiosaurus medius; England; Europe; Middle

1. The generic name Cetiosaurus was first published by Owen (1841, p. 457) without any associated specific name. It was based primarily on material found by John Kingdon in 1825, but no specimen numbers were given. Cetiosaurus was among the first named sauropod dinosaurs and, as a result, has become a  ‘wastebasket’ taxon, with much material indiscriminately referred to it. As detailed by Upchurch &
Martin (2003, p. 208), the stratigraphic range of Cetiosaurus, if all referrals were
supported, would extend from the Bajocian (Middle Jurassic) to the Barremian
(Early Cretaceous), a range of about 45 million years.
2. The first published species of Cetiosaurus were C. hypoolithicus Owen, 1842 and
C. epioolithicus Owen, 1842, both published in the same report (Owen, 1842a, p. 12).
The type material was not specified for either species, and neither was illustrated or
diagnosed; therefore both species are nomina nuda, and are ineligible for fixation as
the type species (Upchurch & Martin, 2003, p. 209).
3. The next published species of Cetiosaurus were C. brevis, C. brachyurus, C.
medius and C. longus, all described in a single report by Owen (1842b, pp. 94, 100a,
100b, 101). Since descriptions of all four species were furnished, they are not nomina
nuda and are thus available names for fixation as the type species. Although Owen
did not explicitly designate any of these species as the type, he did note of the C.
medius material that ‘it is principally on these bones, with others subsequently
discovered and in the collection of Mr. Kingdon, that the characters of the
Cetiosaurus were first determined’ (Owen, 1842b, pp. 100–101). C. medius is thus the
type species of Cetiosaurus under Article 69.1.1 of the Code (Type species by
subsequent designation), an interpretation endorsed by, for example, Steel (1970,
p. 64).
4. Cetiosaurus oxoniensis was described by Phillips (1871, p. 291) from a large series
of remains from the Forest Marble (Bathonian, Middle Jurassic of Oxfordshire),
among which no type specimen was formally designated. Phillips (1871, pp. 290–291)
wrote only ‘I propose for the species found in the immediate vicinity of Oxford and
elsewhere, the only one for which sufficient materials are collected to serve for
determining its characters, the title Oxoniensis’, so that Phillips’s specimens found in
this area form a syntype series. Among these specimens, the largest of three
individuals from Bletchingdon Station, near Enslow Bridge, is the most complete and
diagnostic; it was therefore designated as the lectotype (OUMMNH J13605–13613,
J13615–16, J13619-J13688, J13899 in the Oxford University Museum of Natural
History) by Upchurch & Martin (2003, p. 216). The material represents a nonneosauropod
eusauropod. It is important due to its historical significance as the first
sauropod known from adequate remains, illustrating the basic sauropod body plan,
and also because of the light it casts on the evolution of sauropods, being one of
the most derived taxa outside the clade Neosauropoda (Upchurch, 1998, fig. 19;
Upchurch et al., 2004, fig. 13.18). Cetiosaurus is the type genus of the family
CETIOSAURIDAE Lydekker, 1888 and was used as a specifier in the phylogenetic
definition of the clade CETIOSAURIDAE (Upchurch et al., 2004, p. 301).
5. Several further species of Cetiosaurus have also been erected. As summarised by
Upchurch & Martin (2003, p. 215), of the thirteen named species, three are nomina
nuda, two are junior objective synonyms, four are nomina dubia, and four are
diagnosable taxa (C. brevis, C. oxoniensis, C. glymptonensis Phillips, 1871, p. 291 and
C. humerocristatus Hulke, 1874, p. 17). These last four cannot be congeneric as they
represent several different sauropod groups.
6. Under a strict application of the Code, Cetiosaurus medius is the type species of
Cetiosaurus. However, the name Cetiosaurus has invariably been associated with the
species C. oxoniensis, and specifically the Bletchingdon Station material (e.g. Owen,
1875; Hatcher, 1903; Huene, 1904, 1927; Fraas, 1908; Janensch, 1914, 1929;
Matthew, 1915; Coombs, 1975; Wild, 1978; Bonaparte, 1986, 1999; Martin, 1987;
Upchurch, 1998; Casanovas et al., 2001; Upchurch & Martin, 2002, 2003; Liston,
2004; Day et al., 2004; Upchurch et al., 2004; Sánchez-Hernández, 2005; Wedel, 2005, 2007; Yates, 2006, 2007; Galton & Knoll, 2006; Moser et al., 2006; Naish & Martill,
2007; Taylor & Naish, 2007). The stability of use of this species in the literature as
representing Cetiosaurus is indicated by the fact that no other generic name has ever
been proposed for C. oxoniensis; nor has it ever been referred to as ‘Cetiosaurus’
oxoniensis. Enforcing the strict application of the Code would lead to considerable
nomenclatural confusion and inconsistency.
6. For this reason, Upchurch & Martin (2003, p. 215) informally treated
Cetiosaurus oxoniensis as the type species of Cetiosaurus pending a promised petition
to the Commission.
7. The International Commission on Zoological Nomenclature is accordingly
(1) to use its plenary power to set aside all previous fixations of type species for the
nominal genus Cetiosaurus Owen, 1841 and to designate Cetiosaurus oxoniensis
Phillips, 1871 as the type species;
(2) to place on the Official List of Generic Names in Zoology the name Cetiosaurus
Owen, 1841 (gender: masculine), type species Cetiosaurus oxoniensis Phillips,
1871, as ruled in (1) above;
(3) to place on the Official List of Specific Names in Zoology the name oxoniensis
Phillips, 1871, as published in the binomen Cetiosaurus oxoniensis (specific
name of the type species of Cetiosaurus Owen, 1841), as ruled in (1) above.
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Acknowledgement of receipt of this application was published in BZN 65: 162.
Comments on this case are invited for publication (subject to editing) in the Bulletin; they
should be sent to the Executive Secretary, I.C.Z.N., c/o Natural History Museum, Cromwell
Road, London SW7 5BD, U.K. (e-mail: iczn@nhm.ac.uk).

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