Abstract
The systematic study of the Plagiolophinae (Remy, 1976) nov. rank (Perissodactyla, Mammalia) from the Eocene of the Duero Basin (Castilla y Leon, Spain) has permitted the identification of two new species: Plagiolophus casasecaensis nov. sp. of the Casaseca site (middle Eocene, MP 13-14, Zamora province) that is a very primitive species; and Plagiolophus mazateronensis nov. sp. of the Mazateron (middle-upper Eocene, MP 16-17, Almazan subbasin, Soria province) and Caenes sites (middle Eocene, MP 16, Salamanca province) which are described by a special combination of primitive and derivative characteristics unknown in other species of the genus. Other forms poorly documented and attributable to genus Plagiolophus occur in Jambrina and El Viso-Sanzoles (MP 13-14, Zamora province), San Morales (MP 16, Salamanca province), Deza (upper Eocene, Soria province), Molino del Pico (upper Eocene-Oligocene, Zamora province), and Mazateron. The genus Leptolophus that has been determined in Mazateron, had only been known before in sorne French localities. This Plagiolophinae assemblage is clearly biogeographically different from the already known findings in occidental Europe and subpirenaic area.
Highlights
The genus Leptolophus that has been determined in Mazaterón, had only been known before in sorne French localities
which are described by a special combination
attributable to genus Plagiolophus occur in Jambrina
Summary
Diagnosis (nueva): Equoidea de talla pequeña a media. Fórmula dentaria 3/3 111 4-3/4-3 3/3. Diastema postcanino relativamente breve a muy largo. Dientes yugales superiores braquidontos a semihipsodontos, a veces hipsodontos, de sublofodontos a muy lofodontos. Lofos linguales siempre bien desarrollados, altos y largos. Molares superiores con o sin mesostilo; paracono normalmente más alto que el metacono; hipocono más alto que protocono en MI-2/, aproximadamente igual en M3/, no reducido respecto al protocono. Diferencia de alturas no muy marcada entre los conos labiales (para y metacono) y los linguales (proto e hipocono). Curvatura lingual de la pared externa no muy marcada. Dientes inferiores de braquilofodontos a muy lofodontos, selenolofodontos. Fuerte hipoconúlido en M/3, con cresta anterior dirigida al hipocónido, medio del hipolófido o entocónido. Autopodio relativamente esbelto a muy esbelto; en cuanto conocidos, mano tetradáctila o tridáctila, pie tridáctilo
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