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Kasawari, North Sulawesi, Indonesia
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Moss Beach, California, United States
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Haapiti, les du Vent, Polynsie Franaise
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An uncommon find; tropical at the southern extent of its range in Sydney. URG's 60th Clifton Gardens
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Named after the tasty Aussie cake, or the habit that it has of collecting algae that is drifting by. You can see the fine tentacles that stick out to grab the algae so it can be eaten; they are quite different to the white spines. All of the T. gratilla at Camp Cove today were holding little "hats" of algae. Cute!
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A living T. g. elatensis showing Type B pollution-induced deformity in Eilat, Red Sea: It showed mainly as an extreme apical collapse . It was apprently caused by chemicals ejected from a hotels laundry into an artificial lagoon. 2/3 of the population showed this deformity. This deformity was described by Dafni (1983b). It is still shown occasionally in small shore streches, apparently affected by polluted waters.
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Santa Cruz, California, United States
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Scientific name: Pseudoboletia maculata
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Kampong Pasir Ris, North East, Singapore
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Kadena, Okinawa, Japan
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Singapore, North East, Singapore
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Onna, Okinawa, Japan
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Quebec, Canada
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Tests of Red Sea T. g. elatensis showing the rather smooth appearance of the test. arrows show the paucity of spine tubercles - less than 1 spine for each interambulacral plate (most oceanic Tripneustes - T. gratilla, T. depressus and T. ventricosus - all show at least one primary spine for each plate). The wide space between the ambulacra is densely covered by pedicellaria, which are poisonous the a certain degree (some people become allergic to it).
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Santa Cruz, California, United States
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Yomitan, Okinawa, Japan
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Buona Vista, South West, Singapore
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Singapore, North East, Singapore
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Type A Deformed test of a T.g.elatensis showing exaggerate vertical growth, and "pinched" ambulacra, simultaneusly in all five ambulacra. A detailed descriotion of these deformities is shown in Dafni, 1980 and in Dafni & Erez 1987a,b.
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Scientific name: Pseudoboletia maculata
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Buona Vista, South West, Singapore