entoplastron


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entoplastron

[¦en·tō¦plas‚trän]
(vertebrate zoology)
The anterior median bony plate of the plastron of chelonians.
References in periodicals archive ?
5 times in some species); more developed anterolateral epiplastral lips than in Palaeoemys; proximity or contact of the humero-pectoral sulcus with the entoplastron, this sulcus being placed far behind the entoplastron in Palaeoemys; absence of the marked medial concavity identified the humero-pectoral and pectoro-abdominal sulci of Palaeoemys (Claude and Tong, 2004; Hervet, 2004a).
The diagnosis for both Cuvierichelys and Landreatchelys proposed by Hervet (2004a) indicated that both taxa lacked well-developed keels in the carapace, but that they could have a poorly-developed posterior medial keel; moderately wide first vertebral, as wide as or wider than the nuchal plate; sub-straight or slightly curved lateral margins of the first vertebral scute; subtrapezoidal anterior plastral lobe, with rounded lateral margins; gulars not overlying the anterior region of the entoplastron, or showing a short overlap.
Thus, the position of the humero-pectoral sulcus relative to the posterior margin of the entoplastron is here recognized as variable in Cuvierichelys iberica, as in the taxon from Boutersem.
DESCRIPTION: Neural row reduced, neurals tetragonal; plastron cruziform, anterior plastral lobe slightly shorter than the posterior one; epiplastrals and entoplastron present.
Epiplastrals and entoplastron are not known, refer also to GAFFNEY (1975), JOYCE (2003) and MLYNARSKI (1976).
Epiplastrals and entoplastron present, see also ZITTEL (1898, 1918) and figure 6 here.
The preserved elements, an entoplastron and a right epiplastron, preserve sufficiently diagnostic characteristics to permit species-level identification.
1a and 1b) is an entoplastron found in the 55-60 cm below-datum level of grid 1N 3E (details of the grid system were provided by Jass, 2007).
En Mexico, solo se conocen fosiles del genero Kinosternon que carece de entoplastron (Ernst & Barbour 1989), por lo que no es posible relacionar a los fosiles de San Buenaventura Nealtican con Kinosternidae.
Plastron plates: Epi = epiplastrons, Ento = entoplastron, Hyo = hyoplastrons, Hypo = hypolpastrons, Xiphi = xiphiplastrons.
Description: The most characteristic shell element in the present material is the entoplastron HS 407e.
En 1968 JIMENEZ, en su descripcion holotipica de Neochelys salmanticensis, cita como cotipo un entoplastron procedente de Corrales.