Eritherium

Eritherium azzouzorum
Eritherium is an extinct genus of early Proboscidea found in the Ouled Abdoun basin (early Thanetian age), Morocco.wikipedia
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Proboscidea

proboscideanproboscidproboscideans
Eritherium is an extinct genus of early Proboscidea found in the Ouled Abdoun basin (early Thanetian age), Morocco.
The earliest known proboscidean is Eritherium, followed by Phosphatherium, a small animal about the size of a fox.

Thanetian

Late PaleoceneLandenianMP 6
Eritherium is an extinct genus of early Proboscidea found in the Ouled Abdoun basin (early Thanetian age), Morocco.
Also, the first representatives of Proboscidea appeared, Eritherium.

Ouled Abdoun Basin

Oulad Abdoun BasinOuled Abdoun
Eritherium is an extinct genus of early Proboscidea found in the Ouled Abdoun basin (early Thanetian age), Morocco.

Genus

generageneric namegeneric
Eritherium is an extinct genus of early Proboscidea found in the Ouled Abdoun basin (early Thanetian age), Morocco.

Morocco

MoroccanSultanate of MoroccoKingdom of Morocco
Eritherium is an extinct genus of early Proboscidea found in the Ouled Abdoun basin (early Thanetian age), Morocco.

Holotype

based ontypeholotype specimen
The holotype (specimen number MNHN PM69) is now in the Musée d'histoire naturelle - Guimet in Lyon and includes an upper jaw (with approaches of the zygomatic bone and two maxillary branches, each of the two posterior premolars (P3 and 4) and three molars (M1-3)).

Lyon

Lyon, FranceLyonsLyons, France
The holotype (specimen number MNHN PM69) is now in the Musée d'histoire naturelle - Guimet in Lyon and includes an upper jaw (with approaches of the zygomatic bone and two maxillary branches, each of the two posterior premolars (P3 and 4) and three molars (M1-3)).

Zygomatic bone

cheekbonezygomaticcheek bone
The holotype (specimen number MNHN PM69) is now in the Musée d'histoire naturelle - Guimet in Lyon and includes an upper jaw (with approaches of the zygomatic bone and two maxillary branches, each of the two posterior premolars (P3 and 4) and three molars (M1-3)).

Maxillary nerve

maxillarymaxillary divisionpalatine nerve
The holotype (specimen number MNHN PM69) is now in the Musée d'histoire naturelle - Guimet in Lyon and includes an upper jaw (with approaches of the zygomatic bone and two maxillary branches, each of the two posterior premolars (P3 and 4) and three molars (M1-3)).

Paenungulata

paenungulatespaenungulateUranotheria
Generally, Eritherium shared similarities in the structure of their teeth with other Paenungulata such as the extinct Embrithopoda or early representatives of the manatees, but their teeth are more specialised.

Embrithopoda

embrithopodembrithopods
Generally, Eritherium shared similarities in the structure of their teeth with other Paenungulata such as the extinct Embrithopoda or early representatives of the manatees, but their teeth are more specialised.

Manatee

TrichechidaeTrichechusmanatees
Generally, Eritherium shared similarities in the structure of their teeth with other Paenungulata such as the extinct Embrithopoda or early representatives of the manatees, but their teeth are more specialised.

Incisor

incisorsincisor teethfront teeth
The dentition of the mandible that was reconstructed (from two left fragments) made up the complete sequence of the original teeth of mammals: with three incisors, one canine, four premolars and three molars.

Canine tooth

canine teethcaninecanines
The dentition of the mandible that was reconstructed (from two left fragments) made up the complete sequence of the original teeth of mammals: with three incisors, one canine, four premolars and three molars.

Premolar

premolarsbicuspidcheek teeth
The holotype (specimen number MNHN PM69) is now in the Musée d'histoire naturelle - Guimet in Lyon and includes an upper jaw (with approaches of the zygomatic bone and two maxillary branches, each of the two posterior premolars (P3 and 4) and three molars (M1-3)). The dentition of the mandible that was reconstructed (from two left fragments) made up the complete sequence of the original teeth of mammals: with three incisors, one canine, four premolars and three molars.

Molar (tooth)

molarmolarsmolar teeth
The holotype (specimen number MNHN PM69) is now in the Musée d'histoire naturelle - Guimet in Lyon and includes an upper jaw (with approaches of the zygomatic bone and two maxillary branches, each of the two posterior premolars (P3 and 4) and three molars (M1-3)). The dentition of the mandible that was reconstructed (from two left fragments) made up the complete sequence of the original teeth of mammals: with three incisors, one canine, four premolars and three molars.

Diastema

diastematagapdiastemas
The tooth row was closed and had no diastema between the canine tooth on the front and back teeth.

Tooth enamel

enameldental enamelenamel prism
The molars were generally bunodont (i.e. with small enamel cusps on the occlusal surface-bearing structure).

Symphysis

symphysialSubsymphysealsymphyseal
Another primitive characteristic is the short symphysis of the mandible.

Orbit (anatomy)

orbitorbitseye socket
The reconstruction of the upper portion of the skull showed that the eye socket was relatively far forward in the skull.

Basal (phylogenetics)

basalbasalmostprimitive
Fitting with its great age, Eritherium is basal to all other primitive proboscideans (including Phosphatherium, Numidotherium, Moeritherium and Daouitherium) which together form one of the most complete evolutionary sequences of early mammalian radiations following the K/T extinction event.

Phosphatherium

Fitting with its great age, Eritherium is basal to all other primitive proboscideans (including Phosphatherium, Numidotherium, Moeritherium and Daouitherium) which together form one of the most complete evolutionary sequences of early mammalian radiations following the K/T extinction event.

Numidotherium

Fitting with its great age, Eritherium is basal to all other primitive proboscideans (including Phosphatherium, Numidotherium, Moeritherium and Daouitherium) which together form one of the most complete evolutionary sequences of early mammalian radiations following the K/T extinction event.

Moeritherium

MoeritheriidaeMoeritherium andrewsi?Moeritherium sp.
Fitting with its great age, Eritherium is basal to all other primitive proboscideans (including Phosphatherium, Numidotherium, Moeritherium and Daouitherium) which together form one of the most complete evolutionary sequences of early mammalian radiations following the K/T extinction event.

Daouitherium

Fitting with its great age, Eritherium is basal to all other primitive proboscideans (including Phosphatherium, Numidotherium, Moeritherium and Daouitherium) which together form one of the most complete evolutionary sequences of early mammalian radiations following the K/T extinction event.