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Natural fashion jewelry
Natural fashion jewelry While I was chatting with Tony Kalnins the other day, the subject of conversation drifted around to that of sea shell coloration. Since Tony is a dealer in shells and I'm a collector of Cypraeidae, the topic wasn't unusual – but the consequences of this discussion proved to be unusually enlightening and somewhat amusing.
My companion and I were discussing "golden" variants of sea shells, Zoila friendii in particular. After agreeing that some golden shells were not unlike some sun-bleached specimens, Tony half-jokingly suggested baking a C. friendii. We decided to try it. He supplied a couple of chipped specimens which I was to bake in my electric oven.
A few days later I got around to the project. I selected the darker of the two C. friendii for the oven, thinking that the second specimen would serve as a reference (I expected a relatively minor color change). The selected shell had a black-brown base, this color extending up above the margins. The dorsum had the usual irregularly placed dark brown blotches on a bluish background. I used a small thermostatically controlled oven, placing the shell upon a piece of asbestos board. I warmed the shell slowly, taking about one hour to reach 400 F. After one half hour at this temperature, I thought I could see a lightening of the color around the margins. After one hour at 400 F, I again looked through the glass of the oven door. The black-brown just above the margins was definitely turning orange. And so it went. . . .
After six hours at the same temperature, I started reducing the heat. Forty-five minutes later I opened the oven door for the first time since placing the shell within. I removed the warm sea shell. That color! A lovely peach-orange around the margins and base - no sign that the shell had ever been predominantly brown. The fossula remained white and much the same as that of the unbaked specimen. The dorsal blotches, which had been lighter than the basal color, were now a slightly darker shade of orange than the base. The blue ground color had changed to a cream. The overall effect was that of pastel orange hues, with the markings of a typical C. friendii still readily visible. Two or three hairline cracks or stress marks were noted under low magnification -probably from too rapid a thermal change. As with most C. friendii, the shape of this shell was far more irregular than most other sea shells, and this could cause uneven stresses in expansion and contraction – and the tiny cracks. I have seen once-frozen sea shells with far more noticeable stress marks.
Natural fashion jewelry Prosobranch veligers1 are among the most beautiful and interesting organisms living in Philippines's inshore plankton. Their diversity in form and color present a continual source of delight and discovery to both amateur and professional students of the mollusks.
The longest-lived and largest number of planktonic veligers are found in tropical and subtropical marine areas simply because favorable amounts of sunlight and food prevail and because water temperature in these marine areas does not vary as greatly as in temperate areas. It follows, then, that in Philippines we have an unusual opportunity to gather an enormous amount of information concerning molluscan life histories.
Who would use this information?
Experimental embryologists in search of new experimental organisms with which they can study developmental phenomena.
Ecologists who seek to understand nutrition and food webs as they occur in oceanic and estuarine areas.
Pollution specialists who seek animal indicators of water quality.
People who seek to establish regions of aquaculture in which mollusks, fish or crustaceans can be farmed to feed the increasing human population.
Zoologists who want to learn the extent to which a species can be distributed in a specific region.
Photo - Taylor
Figure 1 depicts a presetllement veliger of Serpulorbis nov. sp. with all
appropriate larval structures labelled. Serpulorbis nov. sp., presetllement veliger.
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b. beak. c. columella, e. eye, es. esophagus, f. foot, fg. food groove, h. larval
heart, i. intestine, ldg. larval digestive gland, m. mouth, poc. post-oral cilia,
prc. pre-oral cilia, ss. style sac, t. cephalic tentacle, vldg. ventral lobe
of digestive gland.
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