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Paranyctoides and allies from the Late Cretaceous of North America and Asia
 

Summary: Paranyctoides and allies from the Late
Cretaceous of North America and Asia
J. DAVID ARCHIBALD and ALEXANDER O. AVERIANOV
Archibald, J.D. & Averianov, A.O. 2001. Paranyctoides and allies from the Late Creta-
ceous of North America and Asia. -- Acta Palaeontologica Polonica 46, 4, xxx­xxx.
Paranyctoides is represented by three named, and possibly four unnamed species in the
Late Cretaceous, North America. P. aralensis from the Late Cretaceous of Dzharakuduk,
Uzbekistan, belongs in this or a closely allied taxon. Lower molars have low trigonids,
well-developed paraconids not appressed against metaconids, talonids on m1­2 as wide or
wider than trigonids, hypoconulids often closer to entoconids than to hypoconids. Only
two upper molars are known, both have comparatively narrow crowns with wide stylar
shelves and stylar cusps, paracone and metacone separated, conules well developed, and
protocone low. Pre- and postcingula vary from narrow in one, Sailestes quadrans, to wide
in the other, Paranyctoides sp. Sailestes quadrans may be an metatherian. All known spe-
cies of Paranyctoides from North America have a submolariform ultimate premolar while
Gallolestes pachymandibularis, also from North America, has molars not unlike those in
Paranyctoides but may have an ultimate premolar with a molariform trigonid. Aspecimen
from Dzharakuduk referable to P. aralensis is suggestive of such morphology. At least P.
aralensis had five premolars with the third reduced as in `zhelestids'. These findings in-
crease the Late Cretaceous North American/Asian ties even more for eutherians, now with

  

Source: Archibald, J. David - Department of Biology, San Diego State University

 

Collections: Biology and Medicine; Geosciences