[dinosaur] Acuetzpalin, new ichthyosaur from Upper Jurassic of Mexico

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Ben [email protected]=0A=0AA new paper:=0A=0AAcuetzpalin carra=
nzai gen. et sp. nov.=0A=0A=0AJair Israel Barrientos-Lara, Jes=C3=BAs Alvar=
ado-Ortega & Marta S. Fern=C3=A1ndez=0A(2020)=0AAcuetzpalin carranzai gen e=
t sp. nov. A new ophthalmosauridae=0A(Ichthyosauria) from the Upper Jurassi=
c of Durango, North Mexico.=0AJournal of South American Earth Sciences: 102=
456 (advance online=0Apublication)=0Adoi: https://urldefense.proofpoint.com=
/v2/url?u=3Dhttps-3A__doi.org_10.1016_j.jsames.2019.102456&d=3DDwIFaQ&c=3Dc=
lK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKH=
n5g4z1CYJgFW9SI&m=3D9DiZ2_AoM6ajWyFDCnJ-DMseYB-vvebKeKYmWO_JGBQ&s=3DUFZ-fWl=
CwKQB3oezUAYu7sbzc27ll9gdpTqwWfmuXYg&e=3D=20=0Ahttps://urldefense.proofpoin=
t.com/v2/url?u=3Dhttps-3A__www.sciencedirect.com_science_article_abs_pii_S0=
895981119304444&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&=
r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3D9DiZ2_AoM6ajWyFDCnJ-DMs=
eYB-vvebKeKYmWO_JGBQ&s=3DfovhZ9MnVof2memgvHWtMHPKljsh4G4_23muNx00lbU&e=3D=
=20=0A=0AHighlights=0A=0ADescription of the most complete Kimmeridgian opht=
halmosaurid from Mexico.=0AA unique combination of characters allows the er=
ection of a new genus and=0Aspecies, Acuetzpalin carranzai.=0AThe phylogene=
tic reconstruction confirms that Acuetzpalin carranzai is a=0Amember of the=
 family Ophthalmosauridae.=0A=0AAbstract=0A=0AThe family Ophthalmosauridae =
gathers the most derived ichthyosaurs from the=0AMiddle Jurassic - earliest=
 Late Cretaceous marine deposits of North=0AAmerica, South America, Asia, E=
urope, and Australia. Although this group=0Ahas a worldwide distribution, i=
ts records from the Caribbean realm,=0Aparticularly from Mexico, are still =
comparatively scarce; therefore, the=0Arole of these fossils to understand =
the diversification of the family is=0Anegligible. Herein we describe Acuet=
zpalin carranzai gen. et sp., based on=0Aan almost complete specimen from t=
he Kimmeridgian deposits at the Sierra de=0APalotes, Durango, central Mexic=
o, which belong to the La Casita Formation.=0AThis new taxon exhibits a uni=
que combination of features supporting its=0Ataxonomical singularity; these=
 include the presence of the parietal foramen=0Aentirely surrounded by the =
parietals, a robust and short supratemporal=0Aprocess on the parietal, a lo=
ng middle parietal symphysis, the internal=0Acarotid foramen exposed on the=
 posterior surface of the basisphenoid,=0Astapedial shaft moderately slende=
r, the opisthotic and stapedial facets of=0Athe basioccipital laterally exp=
osed, the intermedium separates the radius=0Afrom the ulna and has no conta=
ct with the humerus, and the nasal lacks the=0Alateral =E2=80=9Cwing=E2=80=
=9D over the dorsal border of the naris. This fossil, the second=0Aophthalm=
osaurid species found in Mexico, complements the ichthyosaurs=0Adiversity i=
n the western domain of the Tethys Sea, at the southern end of=0ANorth Amer=
ica. A phylogenetic analysis reveals that Acuetzpalin carranzai=0Ais member=
 of the subfamily Platypterygiinae and is located among the=0Amost-derived =
platypterygiines.=0A=

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<div dir=3D"ltr"><br><div>Ben Creisler</div><div><a href=3D"mailto:bcreisle=
[email protected]">[email protected]</a></div><div><br></div><div>A new paper:<=
/div><div><br></div><div>Acuetzpalin carranzai gen. et sp. nov.</div><div><=
br></div><div><br>Jair Israel Barrientos-Lara, Jes=C3=BAs Alvarado-Ortega &=
amp; Marta S. Fern=C3=A1ndez (2020)<br>Acuetzpalin carranzai gen et sp. nov=
. A new ophthalmosauridae (Ichthyosauria) from the Upper Jurassic of Durang=
o, North Mexico.<br>Journal of South American Earth Sciences: 102456 (advan=
ce online publication)<br>doi: <a href=3D"https://urldefense.proofpoint.com=
/v2/url?u=3Dhttps-3A__doi.org_10.1016_j.jsames.2019.102456&amp;d=3DDwMFaQ&a=
mp;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&amp;r=3DRy_mO4IFaUmGof_Y=
l9MyZgecRCKHn5g4z1CYJgFW9SI&amp;m=3D9DiZ2_AoM6ajWyFDCnJ-DMseYB-vvebKeKYmWO_=
JGBQ&amp;s=3DUFZ-fWlCwKQB3oezUAYu7sbzc27ll9gdpTqwWfmuXYg&amp;e=3D">https://=
doi.org/10.1016/j.jsames.2019.102456</a> <br><a href=3D"https://urldefense.=
proofpoint.com/v2/url?u=3Dhttps-3A__www.sciencedirect.com_science_article_a=
bs_pii_S0895981119304444&amp;d=3DDwMFaQ&amp;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUH=
hpN0H8p7CSfnc_gI&amp;r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&amp;m=
=3D9DiZ2_AoM6ajWyFDCnJ-DMseYB-vvebKeKYmWO_JGBQ&amp;s=3DfovhZ9MnVof2memgvHWt=
MHPKljsh4G4_23muNx00lbU&amp;e=3D">https://www.sciencedirect.com/science/art=
icle/abs/pii/S0895981119304444</a><br><br>Highlights</div><div><br>Descript=
ion of the most complete Kimmeridgian ophthalmosaurid from Mexico.<br>A uni=
que combination of characters allows the erection of a new genus and specie=
s, Acuetzpalin carranzai.<br>The phylogenetic reconstruction confirms that =
Acuetzpalin carranzai is a member of the family Ophthalmosauridae.<br><br>A=
bstract</div><div><br>The family Ophthalmosauridae gathers the most derived=
 ichthyosaurs from the Middle Jurassic - earliest Late Cretaceous marine de=
posits of North America, South America, Asia, Europe, and Australia. Althou=
gh this group has a worldwide distribution, its records from the Caribbean =
realm, particularly from Mexico, are still comparatively scarce; therefore,=
 the role of these fossils to understand the diversification of the family =
is negligible. Herein we describe Acuetzpalin carranzai gen. et sp., based =
on an almost complete specimen from the Kimmeridgian deposits at the Sierra=
 de Palotes, Durango, central Mexico, which belong to the La Casita Formati=
on. This new taxon exhibits a unique combination of features supporting its=
 taxonomical singularity; these include the presence of the parietal forame=
n entirely surrounded by the parietals, a robust and short supratemporal pr=
ocess on the parietal, a long middle parietal symphysis, the internal carot=
id foramen exposed on the posterior surface of the basisphenoid, stapedial =
shaft moderately slender, the opisthotic and stapedial facets of the basioc=
cipital laterally exposed, the intermedium separates the radius from the ul=
na and has no contact with the humerus, and the nasal lacks the lateral =E2=
=80=9Cwing=E2=80=9D over the dorsal border of the naris. This fossil, the s=
econd ophthalmosaurid species found in Mexico, complements the ichthyosaurs=
 diversity in the western domain of the Tethys Sea, at the southern end of =
North America. A phylogenetic analysis reveals that Acuetzpalin carranzai i=
s member of the subfamily Platypterygiinae and is located among the most-de=
rived platypterygiines.<br><br></div></div>=0A=

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