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Tenellia
sp. #16
 
Tenellia sp. #16

Maximum size:  10 mm.

Identification:  This is a translucent-gray aeolid flecked with white. The rhinophores and cephalic tentacles are frosted with white. The ceratal core is mottled orange-brown to greenish and the tips of the cerata are translucent-violet with narrow, subapical red-brown bands.

Natural history:  Tenellia sp. #16 has been recorded from test panels set in Pearl Harbor, Oahu; from a frayed buoy line at a depth of about 6 m (20 ft) on the Big Island and from a protected, silty site on the Big Island. The latter animals were found on an orange-pink hydroid (Corydendrium cf. parasiticum) in association with Unidentia sp. #1. It appears to feed on that hydroid. (Note 1)

Distribution:  Big Island and Oahu: also recorded from Guam.

Taxonomic notes:  It was first recorded in Hawaii from Pearl Harbor, Oahu by Clay Carlson(?) and was formerly placed in the genus Cuthona. (Note 2)

Photo:  Kate Butler: 5-10 mm: Kawaihae, Big Island, July 9, 2022.

Observations and comments:

Note 1:  Perhaps, it's a direct developer based on the small number of relatively large eggs carried internally?

Note 2:  It may be an introduction from Guam via ships coming to Hawaii for dry dock.
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