entoplastron


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entoplastron

(ˈɛntəʊˌplæstrən)
n, pl -tra (-trə)
(Zoology) the median plate of a turtle's plastron
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ROM-42183 is an entoplastron. On the ventral surface are visible, well-defined gular-humeral and humeral-pectoral sulci on both sides of the specimen, which are nearly symmetrical (Fig.
Loveridge and Williams (1957), based on the erroneous reconstruction of Segura (1944), mentioned "Geochelone costarricensis" as an example of a tortoise species with the humeral pectoral sulcus crossing the entoplastron, but make no further reference to it.
Here we report discovery of two new fossil specimens of tortoises from Cathedral Cave, review morphological differences in the entoplastron and epiplastron of some North American testudinoids, and discuss the temporal and spatial significance of these fossils.
En la parte anterior derecha del hyoplastron se observan dos suturas, la primera de forma curva, que articulaba a este elemento con el entoplastron, la segunda es de forma recta y conectaba al hyoplastron con el epiplastron.
The entoplastron is reduced, separating only the epiplastrals and very little of the hyoplastrals.
Devils Nest: one costal fragment, one entoplastron, two plastral fragments, one osteoderm, UNSM 56908.
Cervical distinctly developed, visceral part larger than dorsal part; epiplastron strongly vaulted, with distinctly marked geoemydaloid gular bulge; gular furrows cutting entoplastron, humeropectoral furrows not; entoplastron 1,2 x broader than long, rhomb-like, anteriorly markedly pointed; anal notch obtuse-angled; pygal geoemydaloid; neurals emydoidal and geoemydaloid; three (to maybe five) strong dorsal keels, no keel on bridge developed; bridge piers week, inguinal piers inserting into pleural I via peripherals II and III, peripherals III with distinct visceral moschus channel, all marginal furrows situated on peripherals; typical geoemydaloid structure of areols on carapace present, surface of carapace with coarse sculpture, partly with very deep furrows on the horn-scutes.
Plastron plates: epiplastrals = epi, entoplastron = ento, hyoplastron = hyo, hypoplastron = hypo, xiphiplastron = xiphi.
En 1968 Jimenez cita en Corrales el cotipo de Neochelys salmanticensis, consistente en un entoplastron (STUS 124) y en 1971 un mesoplastron (STUS 70).