[D] Ojoraptorsaurus boerei [sG] [T]
Describer
Sullivan, Jasinski & Tomme, Van 2011
Time
Cretaceous Late Maastrichtian
Classification
Saurischia Theropoda Tetanurae Coelurosauria Oviraptorosauria Caenagnathidae
Diet
Carnivore
Fossilsite
Ojo Alamo Sandstone (Ojo Alamo Formation), Naashoibito Member, San Juan Basin, New Mexico, US
Info
Abstract
A nearly complete pair of pubes is identified as a new caenagnathid oviraptorosaur, Ojoraptorsaurus boerei, n. gen., n. sp., based on having a “spoon-shaped” depression on the anterior dorsal surface of the pubic boot, an elongated anterior process of the pubic boot, a recessed enclosed pubic fossa, the distal end of the pubic shaft convex anteriorly, and a sub-trapezoidal pubic peduncle articulation surface.
Ojoraptorsaurus boerei is most similar to ROM 43250 [Epichirostenotes curriei same paper] (previously assigned to Chirostenotes pergracilis Gilmore) from the Horseshoe Canyon Formation (upper Campanian-lower Maastrichtian) of Alberta, Canada, but differs from it in having a pubic fossa that is lower on the shaft, a trapezoidal-shaped articulation surface of the pubes, a shorter shaft length and in being more robust.
Ojoraptorsaurus boerei is from the Naashoibito Member of the Ojo Alamo Formation, San Juan Basin, New Mexico, and is part of the Alamo Wash local fauna. This fauna is considered to be 69 Ma and thus is early Maastrichtian in age. Ojoraptorsaurus boerei represents the southern-most occurrence of a caenagnathid in North America. It is the first and only known caenagnathid from New Mexico and from the lower Maastrichtian of North America.
Etymology
Derived from “Ojo” referring to the “Ojo Alamo Formation,” the stratum from which the specimen came; “raptor,” a plunderer; and “saurus,” meaning lizard.| The species name honors Arjan C. Boere, who discovered and collected the specimen in 2002.
Holotype
SMP VP-1458. Nearly complete paired, fused pubes.
Type locality, horizon and age
SMP loc. 384b, (De-na-zin Microsite [south]), near Barrel Springs, San Juan Basin, NM. The holotype was collected from the Naashoibito Member of the Ojo Alamo Formation (sensu Bauer, 1916; Powell, 1973; Sullivan and Lucas, 2003, 2006). The age of the Naashoibito Member is “early” Maastrichtian, ~ 69 Ma.
Diagnosis
Ojoraptorsaurus boerei differs from all other caenagnathids in possessing the following autapomorphies: 1) a “spoonshaped” depression on the anterior dorsal surface of the pubic boot; enclosed pubic fossa recessed at least one cm from the acetabular rim, positioned on the medial surface of the pubic shaft; 3) the distal portion of the pubic shaft above the pubic boot is slightly convex anteriorly; and the iliac peduncle articular surface of the pubes is sub-trapezoidal in shape. Differs from the pubes of Microvenator celer (AMNH 3041) in having an enclosed, sub-oval to inverted teardrop-shaped pubic fossa.
Differs from the pubes of Epichirostenotes curriei, n. gen., n. sp. (holotype ROM 43250) in being 20% smaller and relatively more robust, lacking a dorsal suture on the pubic boot, and having a significantly lower pubic apron/pubis length ratio. Differs from the pubes of Nomingia gobiensis (GIN 100/119) in having a spoon-shaped depression, lacking a suture on the dorsal surface of the pubic boot and being more gracile. Differs from CM 78001 in having the outline of the acetabular rim less constricted and smaller (approximately two-thirds the size).
Sullivan, Jasinski & Tomme, Van 2011
Time
Cretaceous Late Maastrichtian
Classification
Saurischia Theropoda Tetanurae Coelurosauria Oviraptorosauria Caenagnathidae
Diet
Carnivore
Fossilsite
Ojo Alamo Sandstone (Ojo Alamo Formation), Naashoibito Member, San Juan Basin, New Mexico, US
Info
Abstract
A nearly complete pair of pubes is identified as a new caenagnathid oviraptorosaur, Ojoraptorsaurus boerei, n. gen., n. sp., based on having a “spoon-shaped” depression on the anterior dorsal surface of the pubic boot, an elongated anterior process of the pubic boot, a recessed enclosed pubic fossa, the distal end of the pubic shaft convex anteriorly, and a sub-trapezoidal pubic peduncle articulation surface.
Ojoraptorsaurus boerei is most similar to ROM 43250 [Epichirostenotes curriei same paper] (previously assigned to Chirostenotes pergracilis Gilmore) from the Horseshoe Canyon Formation (upper Campanian-lower Maastrichtian) of Alberta, Canada, but differs from it in having a pubic fossa that is lower on the shaft, a trapezoidal-shaped articulation surface of the pubes, a shorter shaft length and in being more robust.
Ojoraptorsaurus boerei is from the Naashoibito Member of the Ojo Alamo Formation, San Juan Basin, New Mexico, and is part of the Alamo Wash local fauna. This fauna is considered to be 69 Ma and thus is early Maastrichtian in age. Ojoraptorsaurus boerei represents the southern-most occurrence of a caenagnathid in North America. It is the first and only known caenagnathid from New Mexico and from the lower Maastrichtian of North America.
Etymology
Derived from “Ojo” referring to the “Ojo Alamo Formation,” the stratum from which the specimen came; “raptor,” a plunderer; and “saurus,” meaning lizard.| The species name honors Arjan C. Boere, who discovered and collected the specimen in 2002.
Holotype
SMP VP-1458. Nearly complete paired, fused pubes.
Type locality, horizon and age
SMP loc. 384b, (De-na-zin Microsite [south]), near Barrel Springs, San Juan Basin, NM. The holotype was collected from the Naashoibito Member of the Ojo Alamo Formation (sensu Bauer, 1916; Powell, 1973; Sullivan and Lucas, 2003, 2006). The age of the Naashoibito Member is “early” Maastrichtian, ~ 69 Ma.
Diagnosis
Ojoraptorsaurus boerei differs from all other caenagnathids in possessing the following autapomorphies: 1) a “spoonshaped” depression on the anterior dorsal surface of the pubic boot; enclosed pubic fossa recessed at least one cm from the acetabular rim, positioned on the medial surface of the pubic shaft; 3) the distal portion of the pubic shaft above the pubic boot is slightly convex anteriorly; and the iliac peduncle articular surface of the pubes is sub-trapezoidal in shape. Differs from the pubes of Microvenator celer (AMNH 3041) in having an enclosed, sub-oval to inverted teardrop-shaped pubic fossa.
Differs from the pubes of Epichirostenotes curriei, n. gen., n. sp. (holotype ROM 43250) in being 20% smaller and relatively more robust, lacking a dorsal suture on the pubic boot, and having a significantly lower pubic apron/pubis length ratio. Differs from the pubes of Nomingia gobiensis (GIN 100/119) in having a spoon-shaped depression, lacking a suture on the dorsal surface of the pubic boot and being more gracile. Differs from CM 78001 in having the outline of the acetabular rim less constricted and smaller (approximately two-thirds the size).