GOSLINER & BERTSCH: NEW SPECIES OF NUDIBRANCH MOLLUSKS, MEXICO 119 
um hydroxide (NaOH), allowed to soak for 4-24 hours and then rinsed in ddH 2 0 or deionized H 2 0. 
Once all connective tissue was removed, the radula and jaw were dried and mounted for examina¬ 
tion by scanning electron microscope (SEM). Reproductive systems were carefully removed, 
examined and sketched under a dissecting microscope with a camera lucida. Caryophyllidia and 
penial morphology was also examined by SEM and dissected organs were mounted on stubs and 
air-dried. Structures were then coated with gold/palladium using a Cressington 108 Auto vacuum 
sputter coater. Scanning electron micrographs were produced using a Hitachi SU3500 scanning 
electron microscope. Specimens and dissected structures were deposited at the California Acade¬ 
my of Sciences in the Invertebrate Zoology Department collection (CASIZ). 
Species Descriptions 
Family Discodorididae Bergh, 1891 
Genus Rostanga Bergh, 1879 
Type species: Doris coccinea Forbes, 1848 (=Doris rubra Risso, 1818), by monotypy. 
Rostanga ghiselini Gosliner and Bertsch sp. nov. 
um:lsid:zoobank.org:act:A8F265B6-8E50-4E9F-8C5F-B22C35E7B147 
Figures 1A,B, 2, 3, 4A 
Reddish dorid: Bertsch, 2008:337. 
Rostanga sp.: Bertsch, 2014:177; Bertsch and Aguilar Rosas, 2016:275 (photo). 
Material examined.— Holotype: CASIZ 220373, dissected and subsampled for molecular 
study, 10 m depth, Punta Gringa, Bahia de los Angeles, Baja California, Gulf of California, Mex¬ 
ico, 25 March 2017, Craig Hoover. 
Comparative material examined: Rostanga pulchra: One specimen, CASIZ 097529, Punta 
Vicente Roca, Isla Isabela, Galapagos Islands, 14 May 1994, Paul Humann. 
Additional observations : One specimen, Bahia San Luis Gonzaga, Baja California, Gulf of 
California, Mexico, 11 December 1962, Wesley M. Farmer (photo M321). One specimen, 5 m 
depth, Punta la Gringa, Bahia de los Angeles, Baja California, Gulf of California, Mexico, 12 mm, 
24 October 1986, H. Bertsch. One specimen with egg mass, 3 m depth, Punta la Gringa, Bahia de 
los Angeles, Baja California, Gulf of California, Mexico, 20 mm, 14 March 1992 (HB photo 
M3895). One animal, 6 m depth, Punta la Gringa, Bahia de los Angeles, Baja California, Gulf of 
California, Mexico, 15 mm, 21 December 1994, H. Bertsch (HB photo M4639); One animal, 3 m 
depth, Punta la Gringa, Bahia de los Angeles, Baja California, Gulf of California, Mexico, 16 mm, 
24 December 1995, Hans Bertsch (HB photo M4789); One specimen, Cuevitas, Bahia de los Ange¬ 
les, Baja California, Gulf of California, Mexico, 10 mm, 6 April 1990, H. Bertsch (HB photo 
M3243). One specimen, 4 m depth, Cuevitas, Bahia de los Angeles, Baja California, Gulf of Cal¬ 
ifornia, Mexico 10 mm, 20 March 1994, H. Bertsch. One animal, 3 m depth, Cuevitas, Bahia de 
los Angeles, Baja California, Gulf of California, Mexico, 8 mm, 20 December 1994, H. Bertsch 
(HB photo M4618). One specimen, 5 m depth, s. w. Isla Ventana, Bahia de los Angeles, Baja Cal¬ 
ifornia, Gulf of California, Mexico, 15 mm, 24 February 1997, H. Bertsch (HB photo M5402). One 
specimen, Guaymas, Sonora, Mexico, 30 November 1975, Leroy H. Poorman (photo M 2947). 
Geographical distribution. — Thus far, known only from Bahia San Luis Gonzaga and 
Bahia de los Angeles, Baja California, and Guaymas, Sonora, all within the Gulf of California, 
Mexico. 
Etymology. — This species is named for our colleague and mentor, Michael T. Ghiselin, a 
