The Late Cretaceous placental mammal<i>Kulbeckia</i>

Archibald, J. David; Averianov, Alexander O.

doi:10.1671/0272-4634(2003)023[0404:tlcpmk]2.0.co;2

Cited by 33 publications

(41 citation statements)

References 8 publications

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“…Sasayamamylos kawaii shows a polymorphic intermediate state between primitive forms with four lower incisors and those with three; this indicates that the reduction in the incisor count in the lineage to which Sasayamalestes belongs started from i4. This manner of reduction is different from that presumed for the Zalambdalestidae, in which the i2 was lost first [49]. The presence of S. kawaii and Acristatherium in the Early Cretaceous indicates that the reduction of lower incisor counts from four to three occurred independently at least several times, and probably in several different ways, during the early evolution of the eutherians.…”

Section: Comparison and Discussioncontrasting

confidence: 58%

“…The primitive lower incisor count for eutherians is possibly four [11,47]. Several early eutherians, such as Bobolestes, Eomaia, Eozhelestes and Juramaia have four lower incisors [3,4,44]; there are also some later forms, such as Asioryctes, Kulbeckia and Ukhaatherium, which have four lower incisors [30,48,49], although one of the earlier eutherian mammals, Acristatherium, has only three incisors [5]. Sasayamamylos kawaii shows a polymorphic intermediate state between primitive forms with four lower incisors and those with three; this indicates that the reduction in the incisor count in the lineage to which Sasayamalestes belongs started from i4.…”

Section: Comparison and Discussionmentioning

confidence: 99%

“…Mesozoic eutherians are rather slender, and most Mesozoic eutherians in which the anterior parts of dentaries are known, such as Asioryctes, Barunlestes, Bobolestes, Cimolestes, Daulestes, Eoungulatum, Gypsonictops, Juramaia, Kulbeckia, Maelestes, Paranyctoides, Parazhelestes, Zalambdalestes and Zhelestes do not have a distinct angle at the anterior part of the ventral margin of the dentary; this is owing to the fact that their mandibular symphyses are subparallel or less oblique to the ventral margin of the horizontal ramus [3,10,44,46,[48][49][50][51]54,[57][58][59][60]. This angle is also absent on the dentary of Bishops and Henosferus [40,42].…”

Section: Comparison and Discussionmentioning

confidence: 99%

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A new Early Cretaceous eutherian mammal from the Sasayama Group, Hyogo, Japan

et al. 2013

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We here describe a new Early Cretaceous (early Albian) eutherian mammal, Sasayamamylos kawaii gen. et sp. nov., from the 'Lower Formation' of the Sasayama Group, Hyogo Prefecture, Japan. Sasayamamylos kawaii is characterized by a robust dentary, a distinct angle on the ventral margin of the dentary at the posterior end of the mandibular symphysis, a lower dental formula of 3 -4 : 1 : 4 : 3, a robust lower canine, a non-molariform lower ultimate premolar, and a secondarily reduced entoconid on the molars. To date, S. kawaii is the earliest known eutherian mammal possessing only four premolars, which demonstrates that the reduction in the premolar count in eutherians started in the late Early Cretaceous. The occurrence of S. kawaii implies that the relatively rapid diversification of eutherians in the mid-Cretaceous had already started by the early Albian.

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Section: Comparison and Discussioncontrasting

confidence: 58%

Section: Comparison and Discussionmentioning

confidence: 99%

Section: Comparison and Discussionmentioning

confidence: 99%

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A new Early Cretaceous eutherian mammal from the Sasayama Group, Hyogo, Japan

et al. 2013

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“…A domed dorsal profile of the skull (especially the rostrum) seems, however, to be present in Maiorana, an early Palaeocene "condylarth" (personal observation), although the only known skull of this genus (YPM-PU 14111) is also slightly compressed dorsoventrally. Apparently a domed cranium and rostrum vault is also present in the early-diverging eutherians such as Maelestes, Ukchudukodon, Kennalestes, Asioryctes, Barunlestes, and possibly Kulbeckia (Kielan-Jaworowska 1975a;McKenna et al 2000;Archibald & Averianov 2003;Wible et al 2009). It is absent in the highly specialized skull of Zalambdalestes.…”

Section: Bony Skullmentioning

confidence: 99%

Alcidedorbignya inopinata, a basal pantodont (Placentalia, Mammalia) from the early Palaeocene of Bolivia: anatomy, phylogeny and palaeobiology

et al. 2015

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Alcidedorbignya inopinata Muizon & Marshall, 1987 is a basal pantodont (Placentalia, Mammalia) of small body size, from the early Palaeocene of the Santa Lucia Formation at Tiupampa, Bolivia. Tiupampa is the type locality for the Tiupampan, a South American Land Mammal age (SALMA), which is assigned an age equivalent to the basal Torrejonian 1 of North America (c. 65 Ma). Alcidedorbignya is known by exceptionally preserved specimens, which are described here. The two major specimens are an almost complete skeleton (MHNC 8372) and a partial skull (MHNC 8399), the former representing one of the best-preserved fossil placentals from the early Palaeocene and probably the oldest placental skeleton that is so completely known. These specimens are also the first eutherian skulls and skeleton ever discovered at Tiupampa, a locality which has yielded numerous metatherian skulls and partial skeletons. The remarkable preservation of the two skulls allows a detailed description of the cranial anatomy with well-identified sutures and foramina, including those of the auditory region. Through CT scanning of the skulls, the arterial and venous circulation pattern in the basicranium as well as the bony labyrinth of the inner ear were tentatively reconstructed. A thorough description of the postcranial skeleton of MHNC 8372 is also provided. Among pantodonts, Alcidedorbignya presents the closest morphological similarities with Pantolambda, the oldest and earliest diverging North American pantodont (known by skulls and skeletons), from the late early Palaeocene (Torrejonian 2 and 3) of New Mexico. Alcidedorbignya is one-third the size, much more gracile, and clearly exhibits more plesiomorphic features than Pantolambda. It is also at least 3 Ma older. Interesting similarities are also observed between the skull of Alcidedorbignya and several "condylarths", such as Maiorana, Baioconodon, Arctocyon, and Arctocyonides. The basicranium of Alcidedorbignya is also similar to that of some extant afrotheres (e.g., Tenrec) or Lipotyphla (e.g., 398GEODIVERSITAS • 2015 • 37 (4) Muizon C. de et al. Solenodon), but most of these similarities may represent placental symplesiomorphies. In fact, the cranial anatomy of Alcidedorbignya, beyond the simple thorough description of a basal pantodont, sheds light on the cranial anatomy of placentals from the earliest Paleocene, previously unknown in this detail. The postcranial skeleton of MHNC 8372 together with some isolated specimens referred to A. inopinata, is compared to adequate morphofunctional models (e.g., Solenodon, Dendrohyrax, Sciurus), which indicates that it was a moderately agile, plantigrade, generalized terrestrial mammal with good climbing ability (scansorial) and occasionally capable of standing in a bipedal position. The scutiform ungual phalanges were probably bearing nail-like hooves (or primate-like nails) and because of the absence of claws, fossorial habits are unlikely.A parsimony analysis of a data matrix including 72 taxa and 426 characters (cranial and postcranial...

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“…The earliest known zalambdalestid specimens are the jaws and teeth of Kulbeckia, from the Coniacian of Uzbekistan, which is dated at 85-90 Ma Archibald and Averianov 2003), although the more familiar members are the two Mongolian genera, Zalambdalestes and Barunlestes ( Fig. 7.2(f)), which are Campanian in age.…”

Section: Zalambdalestidaementioning

confidence: 99%

The origin and evolution of mammals

2005

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The Late Cretaceous placental mammalKulbeckia

Cited by 33 publications

References 8 publications

A new Early Cretaceous eutherian mammal from the Sasayama Group, Hyogo, Japan

A new Early Cretaceous eutherian mammal from the Sasayama Group, Hyogo, Japan

Alcidedorbignya inopinata, a basal pantodont (Placentalia, Mammalia) from the early Palaeocene of Bolivia: anatomy, phylogeny and palaeobiology

The origin and evolution of mammals

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