Various fossils pertaining to the holotype of the Triassic ichthyosaur Toretocnemus (originally Leptocheirus, also Merriamia) zitteli. This image is derived from plate 23 in Merriam (1903), done by an uncredited artist. The arrangement of the individual figures has been modified from the original (most notably, figures 3 and 4 were swapped to minimize confusion).
Original description:
Leptocheirus zitteli n. gen. and sp.
Figures reproduced natural size from the type specimen.

Fig. 1.— Right side of skull.
Fig. 2. — Cross-section of posterior portion of the lower jaw, taken above the point marked A on the lateral view of the skull.
Fig. 3. — Cross-section of the upper and lower jaws, taken at the break immediately behind the point marked Sp on the lateral view of the skull.
Fig. 4. — Lateral view of an anterior caudal centrum.
Legend (modified from original):

Ar - articular
A - angular
D - dentary
J - jugal
L - lacrimal
Mx - maxilla
Po - postorbital
Sa - surangular
Se - sclerotic ring
Sp - spenial
T - cross-section of tooth
X - doubtful element

Various fossils pertaining to the holotype of the Triassic ichthyosaur Toretocnemus (originally Leptocheirus, also Merriamia) zitteli. This image is derived from plate 23 in Merriam (1903), done by an uncredited artist. The arrangement of the individual figures has been modified from the original (most notably, figures 3 and 4 were swapped to minimize confusion). Original description: Leptocheirus zitteli n. gen. and sp. Figures reproduced natural size from the type specimen. Fig. 1.— Right side of skull. Fig. 2. — Cross-section of posterior portion of the lower jaw, taken above the point marked A on the lateral view of the skull. Fig. 3. — Cross-section of the upper and lower jaws, taken at the break immediately behind the point marked Sp on the lateral view of the skull. Fig. 4. — Lateral view of an anterior caudal centrum. Legend (modified from original): Ar - articular A - angular D - dentary J - jugal L - lacrimal Mx - maxilla Po - postorbital Sa - surangular Se - sclerotic ring Sp - spenial T - cross-section of tooth X - doubtful element

Informations
Auteur
Uncredited
Licence
Public domain
Source
Wikimedia
Dimensions
2788 × 1695 px
Voir l'original ↗
Associé à
taxon Toretocnemidae
description Trias fossile holotype spécimen Ichthyosauria Leptocheirus Merriamia Toretocnemidae Toretocnemus crâne