Top Posts Tagged with #ossicle

‘Ossicle II’ by Francesco Balzano.

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Ossicle This ring-shaped feature is a piece of calcium carbonate that, about 150 million years ago, was part of a Sea Cucumber. These animals are actually echinoderms – the same phylum as starfish and crinoids, but with a completely different body plan. They are often elongate and mostly fleshy tissue – hence their nickname as “Sea cucumbers”. They secrete a tiny internal skeleton in the form of these tiny, calcite “ossicles” (the term for very small parts of a skeleton or very small bones like those of your ear). In sea cucumbers, the tissues and muscles attach to these tiny rings, helping to provide support for the whole body. When the organism dies, those ossicles are released as mineralized “microfossils” – this one is about half a millimeter across and comes from a limestone from the Tethys Seaway, today found in the Czech Republic. It was photographed using an electron microscope -JBB Image credit: Petr Hykš https://flic.kr/p/DSpxju Reference: http://tolweb.org/Holothuroidea

#Ossicle #Fossil #microfossil #echinoderm #sea cucumber #geology #tethys #limestone #the earth story #science #Fossilfriday

Holothuria scabra Jaeger was investigated for its ossicle morphology by the use of spicule analysis. Buttons, tables, and rods are the most observable ossicles in all weight ranges. Different kinds of rod ossicles such as I-shape rods, spiny branched rods, and less spiny branched rods were observed in some weights. Weights ranged in 20-59g, 60-89g, and 90g and above respectively. I-shape rods was observed in the ventral region of specimens weighing 65g, and 93g, while it was also observed in the dorsal region of specimen weighing 252g. Both spiny and less spiny branched rods were observed mostly on the specimens weighing 40g, and 50g. Other ossicles observed were branched rods, ring-like ossicle, and ellipsoid in buttons. Results obtained in this study show that buttons are the most abundant ossicle observed in the adult stage of H. scabra Jaeger. It is advised that future research use samples weighing between 20 and 250 grams to examine the ossicle formations present on these weights, measure the sizes of the ossicles to be observed with the suggested weights of sample species, and conduct additional sampling from other sites to determine whether a particular ossicle morphology first appears at a particular stage of maturity and may be absent in succeeding stages of maturity.

#Holothuria scabra #Morphology #Ossicle

Holothuria scabra Jaeger was investigated for its ossicle morphology by the use of spicule analysis. Buttons, tables, and rods are the most observable ossicles in all weight ranges. Different kinds of rod ossicles such as I-shape rods, spiny branched rods, and less spiny branched rods were observed in some weights. Weights ranged in 20-59g, 60-89g, and 90g and above respectively. I-shape rods was observed in the ventral region of specimens weighing 65g, and 93g, while it was also observed in the dorsal region of specimen weighing 252g. Both spiny and less spiny branched rods were observed mostly on the specimens weighing 40g, and 50g. Other ossicles observed were branched rods, ring-like ossicle, and ellipsoid in buttons. Results obtained in this study show that buttons are the most abundant ossicle observed in the adult stage of H. scabra Jaeger. It is advised that future research use samples weighing between 20 and 250 grams to examine the ossicle formations present on these weights, measure the sizes of the ossicles to be observed with the suggested weights of sample species, and conduct additional sampling from other sites to determine whether a particular ossicle morphology first appears at a particular stage of maturity and may be absent in succeeding stages of maturity.

#Holothuria scabra #Morphology #Ossicle

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