. Bulletin of the Natural History Museum Zoology. RELATIONSHIPS OF SUNDASALANX 17 recessus lateralis. A large fenestra to the rear of the recessus lateralis communicates with the perilymphatic system. Laterosensory canals No laterosensory canals were observed other than the infraorbital, supraorbital, and temporal canals which converge on the recessus lateralis (Fig. 6). All are short The supraorbital canal does not extend to even over the eye. The temporal canal does not reach the shoulder girdle or form a supratemporal commisure with its counter- part from the opposite side. The infraorbital
. Bulletin of the Natural History Museum Zoology. RELATIONSHIPS OF SUNDASALANX 17 recessus lateralis. A large fenestra to the rear of the recessus lateralis communicates with the perilymphatic system. Laterosensory canals No laterosensory canals were observed other than the infraorbital, supraorbital, and temporal canals which converge on the recessus lateralis (Fig. 6). All are short The supraorbital canal does not extend to even over the eye. The temporal canal does not reach the shoulder girdle or form a supratemporal commisure with its counter- part from the opposite side. The infraorbital canal does not extend to beneath the eye. Osteology No part of the skeleton of Sundasalanx \s heavily ossified. Ossifica- tion of dermal elements appears to be exceptionally slight and many, usually present in other teleosts, may be absent. For example, no parietals or dermal ethmoid element were detected. Caudal skeleton The caudal skeleton of Sundasalanx is highly consolidated, and somewhat reduced (Fig. 7A). Preural centrum 1 and ural centra 1 and 2 are consolidated into a single compound element, to which uroneural 1 is apparently fused. Uroneural 2 is free, and in Barito River Sundasalanx greatly expanded. Only a single epural is present. The parhypural and hypural 1 are fused (observed in an ontogenetic series of cleared and stained materials); the compound parhypural- hypural is autogenous; hypural 2 is fused to the compound centrum; hypural 3 is autogenous; hypural 4 is expanded to about the size of hypural 1; hypural 5 is present. A hypural 6 was not observed. Bases of caudal-fin rays appear unmodified. Pelvic girdle The two vertically oriented bones in the pelvic girdle of Sundasalanx Roberts (1981) termed parapelvie cartilages are unknown elsewhere among fishes. The anterior bone is stouter, more vertically oriented, with its ventral end closely associated with the basipterygium and first pelvic ray (Fig. 1). The posterior bone is more slender, usually longer than t
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