Many anatomical observations agree; several interpretations differ.

Fung reports extensive agreement with Miles on the J-type specimens, while identifying differences in skull-bone nomenclature, the shape of the foramen magnum and ring-like skull markings.

Figure 1 · Josefina, Luisa and Alberto: proportions and individual variation

Study scope and approach

Two perspectives

The report places Miles’s paleontological interpretation alongside Fung’s independent analysis as a retired diagnostic radiologist.

CT material

Fung reviewed DICOM CT datasets for Josefina, Luisa, Alberto and Victoria. The anatomical comparisons here draw on the complete specimens Josefina, Luisa and Alberto.

Focus of the reappraisal

The comparison addresses Part I of the 2022 paper and its anatomical descriptions. Fung calls for open datasets, independent verification and collaboration across disciplines.

Areas of general agreement

01

An upright bipedal body plan with three fingers and three toes, scale-like skin, and long bones with dense cortex, trabeculae and marrow.

02

An elongated skull with large forward-facing orbits, small hinged mouth plates, no teeth and no separate mandible.

03

A single forearm bone and a single lower-leg bone, with unusual joint surfaces and differences among individual specimens.

04

Gastralia, short horizontal ribs, unconventional vertebral structures and an incomplete pelvic ring.

05

Hyperdense oval structures interpreted as eggs, with internal content that Fung considers suggestive of developing embryos.

06

Metallic implants at the chest in Josefina and Luisa, and a smaller implant at Alberto’s injured right hip.

Three major discrepancies

IssueDr. MilesDr. Fung
Foramen magnumDr. MilesSquare, observed externally in loose skulls.Dr. FungOval, observed internally in complete specimens. The report notes the different views and material.
Skull bones and suturesDr. MilesUses a prefrontal-bone interpretation.Dr. FungUses anterior and posterior parietal bones with an accessory parietal suture. Figure 32 maps the two interpretations.
Ring-like skull markingsDr. MilesInterprets concentric lines as growth lines.Dr. FungInterprets the lines as CT stepping artefacts, more evident in reconstructions from thicker slices.

Selected CT illustrations

Figures 1, 10, 15 and 32 from the October 2026 report. Open any image for a closer view.

Read the complete report

Download the complete October 2026 report in English or Spanish, including all comparison tables and CT illustrations.

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October 2026

Dr. K. H. Fung

Retired radiologist · Hong Kong SAR, China