ATCC? Number:50455?
Organism: Proterospongia choanojuncta Leadbeater
Depositors: BS Leadbeater 
Biosafety Level:1
Shipped: frozen 
Growth Conditions: ATCCmedium 1525: Seawater 802 mediumTemperature: 18.0°C
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References:  21623: Leadbeater BS. Life-history and ultrastructure of a new marine species of Proterospongia (Choanoflagellida).  J. Mar. Biol. Assoc. U.K. 63: 135-160, 1983.