The Nautilus . synonyms of Lepton parasiticumby Soot-Ryen (1959). Biological observations: Waldo parasiticus is a di-oecious species. Females produce large, non-plankto-trophic yolky eggs, which are incubated in the space lim-ited by the descending lamella of the inner demibranchand the visceral mass. Larvae, occurring free in the vol-ume of the brooding space, were found in April andNovember in specimens larger than mm. A maxi-mum number of 157 D-shaped larvae ( mmlength X mm width), all in the same develop-mental stage, were found in a maternal individual of long. W
The Nautilus . synonyms of Lepton parasiticumby Soot-Ryen (1959). Biological observations: Waldo parasiticus is a di-oecious species. Females produce large, non-plankto-trophic yolky eggs, which are incubated in the space lim-ited by the descending lamella of the inner demibranchand the visceral mass. Larvae, occurring free in the vol-ume of the brooding space, were found in April andNovember in specimens larger than mm. A maxi-mum number of 157 D-shaped larvae ( mmlength X mm width), all in the same develop-mental stage, were found in a maternal individual of long. Waldo parasiticus lives as an epibiont, securedby the byssus to the spines in the ambulacral areas ofnumerous irregular Antarctic and circumantarctic Schi-zasteridae echinoids (Table 1). The epibiotic behavior inassociation with large invertebrates (referred to as sym-biosis, commensalism or parasitism by different authors)is characteristic of many Galeommatoidea. While the Page 114 THE NAUTILUS, Vol. 116, No. 4. Figures 23-28. Waldo trapezialis new species. 23. Holotype (MLP 6728-1), left lateral view. 24-28. Paratopes (MLP 6728-2).24. Detail of the nepionic shell. 25. Ventral view of a left valve showing ventral gap. 26. Posterior view. 27. Anterior end showinga portion of the mantle fold (much retracted) covering the shell. 28. Detail of the hinge showing the internal ligament. L: internalligament. Scale bars: Figures 23, 25, 26 = 1 mm; Figures 24, 28 = 100 jjum; Figure 27 = 500 u,m. vast majority of galeommatids have been reported to liveon crustaceans, members of the Montacutidae weremainly reported associated with irregular echinoids(Coan et al., 2000; Mikkelsen and Bieler, 1992; Ponder,1968; Deroux, 1961; Popham, 1940). Species erroneously identified as Waldo parasiti-cus: Mortensen (1943) reported specimens of white mussels attached to spines of the echinoid Sterechinusdiadema from Kerguelen Islands; these specimens werelater reported by Arnaud (1964) as Notolepton paras
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
