GOSLINER & BERTSCH: NEW SPECIES OF NUDIBRANCH MOLLUSKS, MEXICO 129 
in T. riosi (Hermosillo and Valdes, 2008, fig. 3a-c). In T. riosi the outer denticles are markedly 
shorter than the inner ones, whereas they are more evenly graduated in the other two species. The 
reproductive systems of the three species also differ. In T. albocrusta (MacFarland, 1966, pi. 69, 
fig. 4) and T. riosi (Hermosillo and Valdes, 2008, fig. 2b), the prostatic portion of the vas deferens 
is much wider than the ejaculatory portion whereas they are about the same width in T. ivetteae. In 
T. ivetteae the bursa copulatrix is spherical and is found at the end of a long duct, whereas it is pyri¬ 
form in both T. albocrusta and T. riosi and has a short duct in the latter species. In T. ivetteae the 
penial stylet is slightly curved where as it is sharply curved in T. albocrusta (MacFarland, 1966, pi. 
69, fig. 4a) and appears to be absent in T. riosi (Hermosillo and Valdes, 2008). 
Acknowledgments 
We are especially grateful to Craig Hoover and Sandra Millen for collecting the type speci¬ 
mens, and Paul Humann for providing comparative material. We thank Ricardo Arce, Tom Smith, 
Mike Miller and Sam Mitani for their great diving assistance at Bahia de los Angeles, and Wesley 
M. Farmer and Lindsey Groves who generously helped in obtaining additional photographic 
records. We also thank Esteban Felix Pico for translating the Abstract. 
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