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PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 64, No. 6 
on this distinction, he considered R. aureomala, R. elandsia, R. phepha and R. ankyra Valdes, 2001, 
together with R. setidens (Odhner, 1939), as members of Boreodoris. This distinction is not con¬ 
sistent since Rostanga phepha has well developed jaws with rodlets (as in Rostanga ) but lacks an 
inn er lateral tooth without a denticulate flange (as in Boreodoris). Two other species have radular 
morphology that is intermediate between the two forms. In Rostanga crawfordi (as R. australis ) 
(Rudman and Avem, 1989), the inner radular in small specimens may have a denticulate flange but 
in larger specimens the inner lateral tooth is entirely smooth. This variability was also confirmed 
by Dayrat (2010). Similarly, in Rostanga lutescens (Bergh, 1905), the inner lateral tooth lacks a 
denticulate flange but the tooth has 1-5 denticles on the inner side and may have additional outer 
denticles (Johnson and Bertsch, 1985; Dayrat, 2010). Therefore, there are no consistent features 
that distinguish Rostanga and Boreodoris and they should, once again, be regarded as synonyms. 
Family Fionidae Gray, 1857 
Genus Tenellia A. Costa, 1866 
Type species: Tenellia mediterranea A. Costa, 1866 (= Tergipes adspersus Nordmann, 1845), by monotypy. 
Tenellia ivetteae sp. nov. 
um:lsid:zoobank.org:act:5BBF0CEl-0CAE-416A-83CB-8679AB637339 
(Figs. 1C, 4B, 6) 
Cuthona sp.: Bertsch and Aguilar Rosas, 2016:301 (photo). 
Cuthona sp. yellow: Bertsch, 2008:336; Bertsch, 2014:177. 
Cuthona sp. 2: Hermosillo, 2006:44, 131, 134. 
Cuthona sp. 3: Behrens and Hermosillo, 2005:131 (photo). 
Cuthona sp. 4: Hermosillo, Behrens and Rios-Jara, 2006:134 (photo). 
Cuthona sp. 6: Camacho-Garcia, Gosliner and Valdes, 2005:105 (photo). 
Material examined.— Holotype: CASIZ 220143, 7 mm length, Punta la Gringa, Bahia de 
los Angeles, Baja California, Mexico, 30 June 1987, Sandra Millen. Paratypes: One specimen, 
CASIZ 222482 (dissected), Bahia de los Angeles, Baja California, Mexico, 30 June 1987, Sandra 
Millen; Three specimens, CASIZ 220142, 6 mm, 3 m depth, 20 June 1992 (HB photo M3968). 
Additional records : Two specimens, 4 and 3 mm with egg masses, 4 m depth, Bahia de los 
Angeles, Baja California, Mexico, 25 July 1993; 1 animal, 3 mm, 10’ deep, 31 October 2003. 
Twelve specimens, Majahuitas, Bahia de Banderas, Jalisco, Mexico, between April 2002-April 
2005, Alicia Hermosillo (Hermosillo, 2006: 134). One specimen, Punta Uvita, Punta Arenas, Costa 
Rica. 
Geographical distribution.— Thus far, known only from Bahia de los Angeles, Baja Cal¬ 
ifornia, and Bahia de Banderas, Jalisco, in Mexico, and Punta Uvita, Pacific coast of Costa Rica. 
Etymology.— This species is named in honor of Senorita Adriana Ivette Cadena, grand¬ 
daughter of Senor Hans, who has helped with his research at Bahia de los Angeles. She and her 
brothers and sisters—the children all around the world—remind us why we must do science and 
do it well: to present informed knowledge for informed decisions affecting their future and the life 
of our planet. 
Description. — External morphology: The living animals (Fig. 1C) reach 7 mm in length. 
The body color is generally translucent white with dense opaque white spotting on the outer two- 
thirds of the rhinophores and oral tentalces. The digestive gland within the cerata is yellowish 
cream white throughout the length of the cerata with a translucent white apex. The opaque white 
ovotestis follicles can be seen through the translucent body. The rhinophores are smooth, thin and 
