. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. o 9. Fig. 40. A. Kuiperiana angulata sp. nov., SAM-PQ-MF0576, RV, MS, TBD 2974, 186 m. B. Palmoconcha? walvisridgensis sp. nov., SAM-PQ-MF0566, holotype, carapace, dorsal outline, TBD 3888, 154 m. Scale bars: A = 100 microns, B = 200 microns. Diagnosis Species with asymmetrically rounded, ventrally directed AM outlines, straight DM, and two strong, curved ventrolateral ribs. Description External features. Elongate ovate lateral outline. Broad, asymmetrically rounded AM with wide rims, ventrally direc
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. o 9. Fig. 40. A. Kuiperiana angulata sp. nov., SAM-PQ-MF0576, RV, MS, TBD 2974, 186 m. B. Palmoconcha? walvisridgensis sp. nov., SAM-PQ-MF0566, holotype, carapace, dorsal outline, TBD 3888, 154 m. Scale bars: A = 100 microns, B = 200 microns. Diagnosis Species with asymmetrically rounded, ventrally directed AM outlines, straight DM, and two strong, curved ventrolateral ribs. Description External features. Elongate ovate lateral outline. Broad, asymmetrically rounded AM with wide rims, ventrally directed. PM rounded, semi-caudate, with apex dorsally directed. DM straight, with a small step at the anterior cardinal angle. VM slightly convex, partly obscured by lateral surface overhang. Surface strongly reticulate, with two curved, sub-parallel ribs on ventrolateral surface. Reticulation is coarsest in sub- central areas. No internal features were observed in specimens that were either poorly pre- served, or carapaces. Remarks Palmoconcha? walvisridgensis is probably conspecific with the taxon recorded from the Pliocene of Gabon by Bold (1966) as Loxoconcha aff. L. australis Brady. The specimen illustrated in Bold (1966, pi. 3 (fig. 6)) appears to be somewhat abraded and consequently has less robust surface ornamentation than my material, but its overall valve shape and reticulation pattern is very similar. The lectotypes of L. aus- tralis Brady, 1880, as illustrated by Puri & Hulings (1976, pi. 18 (figs 17-18), pi. 19 (figs 1-4)) show that walvisridgensis differs from Brady's species in lacking the strong upward sweep of the posteroventral outline, and in the outline of the postero- dorsal margin, which is more acuminate in our species. In addition, L. australis has a distinct posterodorsal hinge ear that gives the posterior end of the DM outline a slight concavity. An Indo-Pacific species that has a similar outline and ornamentation to wal- visridgensis is Loxoc
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
