. Bulletin. Science. 1 â â i'^ii:^: P^ Fig. 1. SEM of a posterior fragment of Loandalia riojai. A. Panoramic view of the ventral portion; B. Close-up of neurosetae (the oblique thread is cotton); C. Close-up of closed nephridial papillae; D. Close-up of open nephridial papillae (scale in D is the same as in C). branchiae, then they could not be used to separate these two genera. Since some nephridial hypertrophy is associated with reproductive activity or with sexual maturity (Schroeder & Hermans 1975), nephridial development cannot be relied upon as a discriminating feature. An early desc
. Bulletin. Science. 1 â â i'^ii:^: P^ Fig. 1. SEM of a posterior fragment of Loandalia riojai. A. Panoramic view of the ventral portion; B. Close-up of neurosetae (the oblique thread is cotton); C. Close-up of closed nephridial papillae; D. Close-up of open nephridial papillae (scale in D is the same as in C). branchiae, then they could not be used to separate these two genera. Since some nephridial hypertrophy is associated with reproductive activity or with sexual maturity (Schroeder & Hermans 1975), nephridial development cannot be relied upon as a discriminating feature. An early description of enlarged nephridial pa- pillae was provided by Moore (1910:369; PI. 31, Fig. 60) when he described Polynoe (?) renotubulata. This species was later moved to a new genus, Bathy- moorea, by Pettibone (1967) due in part to its extended nephridial papillae. This Research Note presents SEM and histological evidence that the ventrolateral struc- tures in Loandalia Monro are nephridial papillae and not branchiae. Posterior fragments of Loandalia riojai Salazar-Vallejo were prepared accord- ing to standard methods for SEM and for histological analysis; some modifications were employed (Sosa-Rodriguez, 1993) from standard Hematoxylin and Eosin techniques. SEM analysis was performed in the Electronic Microscopy Unit of the Instituto de Biologia, UNAM. The histological process was performed in the Laboratory of Invertebrates, Facultad de Ciencias, UNAM. All photographs were processed in the Photography Lab. of ECOSUR. In ventral view, nephridial papillae can be seen clearly set off from neuropo- dium (Fig. lA); each neuropodium is larger than the papillae and clearly distin- guished by the presence of neurosetae which arise from setal bundles containing 2-3 setae each (Fig. IB). If seen from their tip, nephridial papillae appear either. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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