. Bulletin of the British Museum (Natural History), Geology. THE ALBERT RIFT 79 being bridged only by a narrow ligamentous or osseous arch (Greenwood, unpub- lished). Correlated with this latter condition, the pterosphenoid is relatively fore- shortened and not expansive as it is in L. rhachirhinchus and those species with a pedicular tunnel. However, an expansive pterosphenoid does not necessarily imply the development of a tunnel and thus it cannot be concluded that one existed in L. rhachirhinchus. In L. rhachirhinchus, unlike any extant Lates species, the ascending parasphenoid wing, which
. Bulletin of the British Museum (Natural History), Geology. THE ALBERT RIFT 79 being bridged only by a narrow ligamentous or osseous arch (Greenwood, unpub- lished). Correlated with this latter condition, the pterosphenoid is relatively fore- shortened and not expansive as it is in L. rhachirhinchus and those species with a pedicular tunnel. However, an expansive pterosphenoid does not necessarily imply the development of a tunnel and thus it cannot be concluded that one existed in L. rhachirhinchus. In L. rhachirhinchus, unlike any extant Lates species, the ascending parasphenoid wing, which meets the prootic, rises in a gentle slope, not a pronounced step, and there is a corresponding antero-ventral prolongation of the prootic (Fig. 2A). Also unlike the condition in living species is the relatively acute angle formed by the sphenotic and prootic bones where they meet, lateral to the anterior opening of the trigemino-facialis chamber (Fig. 2A). PHYF AHYF EXO BOC. BOC PSGR 20mm Fig. 2. Lates rhachirhinchus. Otico-occipital region of the skull. A. Right lateral aspect. B. Ventral view. (Paratype ) Unstippled areas represent adherent Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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