. Bulletin of the Natural History Museum Zoology. ANATOMY OF THE MELANONIDAE 17 SO esc. exo pro f/X bo v1 Fig. 5. Neurocranium of M. zugmayeri in A, posterior and B, lateral views. In B, the intercalar is unshaded, the margins of the bones underlying it indicated by dashed lines. C, parasphenoid of 66mm SL specimen in dorsal view. frontal, parietal and pterotic. The underside of the bone bears a deep, almost transverse fossa into which articulates the hyomandibular. The pterotic (Figs 4A,B, 5A,B) accom- modates the posterior portion of the hyomandibular fossa along a third of its lateral borde
. Bulletin of the Natural History Museum Zoology. ANATOMY OF THE MELANONIDAE 17 SO esc. exo pro f/X bo v1 Fig. 5. Neurocranium of M. zugmayeri in A, posterior and B, lateral views. In B, the intercalar is unshaded, the margins of the bones underlying it indicated by dashed lines. C, parasphenoid of 66mm SL specimen in dorsal view. frontal, parietal and pterotic. The underside of the bone bears a deep, almost transverse fossa into which articulates the hyomandibular. The pterotic (Figs 4A,B, 5A,B) accom- modates the posterior portion of the hyomandibular fossa along a third of its lateral border. The wall of the pterotic is somewhat bullate and its cranial surface forms a prominent lateral shelf. The pterosphenoid (Figs 4B, 5B) is long and deep forming most of the dorsomedial wall of the orbit, anteriorly it contacts the frontal and posteriorly the autosphenotic and prootic. The parasphenoid (Figs 4B, 5B,C) has a broad keel with, extending from its centre, a long, low ascending process which extends laterally at a low angle to the horizontal plane to meet the prootic; paired, parallel laminae rise from the central region of the keel to meet the bases of the lateral ethmoid wing (Fig. 6). The prootics (Figs 4B, 5B) are large with a deep trigeminal notch. The posterior border of the bone is rounded and partially overlapped by a relatively small, ovoid intercalar to which is attached the inferior limb of the posttemporal(Figs 4B, 5A,B, 6D). The small, pinnacle-like epioccipitals contact the posterolateral margins of the supraoccipital and posteriorly the dorsal borders of their respective exoccipitals; laterally each epioccipital is overlain by the second extrascapular (Fig. 4A). The exoccipitals are deeply depressed posteriorly and con- tain a large, backwardly facing vagus foramen (Figs 5A,B, 7). Medially, the bones meet across the midline by flange-like projections. Posteriorly there is an ovate, cartilage-filled process the base of which meets its antimere in the mi
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Keywords: ., bhlconsortium, bookc, bookcentury1900, bookcollectionbiodiversity
