The Fossil Galliform Bird Paraortygoides from the Lower Eocene of the United Kingdom
Author
DYKE, GARETH J.
Author
GULAS, BONNIE E.
text
American Museum Novitates
2002
2002-03-26
3360
1
15
http://www.bioone.org/doi/abs/10.1206/0003-0082%282002%29360%3C0001%3ATFGBPF%3E2.0.CO%3B2
journal article
3806
10.1206/0003-0082(2002)360<0001:TFGBPF>2.0.CO;2
a64ab3ef-3b21-48c1-8e2e-79efc837b375
0003-0082
4734807
Paraortygoides radagasti
,
new species
ETYMOLOGY: For the wizard of Middle Earth, Radagast the Brown, rabid communicator with birds (
Tolkien, 1954: 269
).
HOLOTYPE
:
BMNH
PAL A 6217 (figs. 2, 3, 4), partial associated specimen consisting of four cervical vertebrae; one sternal fragment; one sacral vertebra; eight rib fragments; three thoracic vertebrae; proximal right scapula; proximal end of right carpometacarpus; distal end of left femur; proximal end of left femur; caput of right femur; left distal femur; proximal end of left tibiotarsus; two fragmentary distal condyles of tibiotarsus; proximal end of left tarsometatarsus; right distal tarsometatarsus; ten pedals; and eleven indeterminate but associated bone fragments (including fragments of? skull bones). This specimen was referred to as a ‘‘small gamebird’’ by
Harrison (1983)
.
PARATYPE
:
BMNH
PAL A 5234, distal end of left tarsometatarsus
.
LOCALITY AND HORIZON: Waltononthe Naze,
Essex
, southeast
England
(fig. 1). Bed A2 of the London Clay Formation, Lower Eocene (Ypresian Stage;
King, 1981
). Both specimens were collected in 1977 by Mr. Steve Vincent (see
Harrison, 1983
).
DIAGNOSIS: As discussed by
Mayr (2000)
,
Paraortygoides
exhibits a number of osteological characters that allow its placement within
Galliformes
. The new species described here, albeit less completely preserved than the known specimens of
P. messelensis
, does preserve characters, including a cranially shifted processus pisiformis of carpometacarpus and an asymmetric plantar side of trochlea metatarsi III, that confirm its placement within the order (see
Mayr, 2000
). However, none of the characters listed by
Mayr (2000: 47)
as uniquely diagnostic for this genus are preserved in BMNH PAL A 6217; hence, our referral of this fossil material to
Paraortygoides
is based on its clear similarity to the currently known specimens of
P. messelensis
(
Fig. 4
, below). Further generic diagnoses for
Paraortygoides
with respect to other wellrepresented Tertiary taxa (e.g.,
Quercymegapodius
,
Gallinuloides
) are given in
Mayr (2000)
.
Paraortygoides radagasti
,
n. sp.
, is differentiated from
P. messelensis
Mayr
on the basis of the following characters: facies articularis humeralis of scapula larger and more robust; processus extensorius of carpometacarpus narrower and more proximally upturned; processus pisiformis more prominent. Measurements of preserved elements are given in
table 1
.