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California State Polytechnic University – Pomona

1. Jung, Dae-Wui. The return of the clown: Pseudocryptic speciation in the North Pacific clown nudibranch, Triopha catalinae (Cooper, 1863) s.l. identified by integrative taxonomic approaches.

Degree: MS, Department of Biological Sciences, 2019, California State Polytechnic University – Pomona

The North Pacific nudibranch species Triopha catalinae (Cooper, 1863), also known as the clown nudibranch, includes two distinct morphotypes based on photographic records, the northern morphotype found from South Korea to Central California, and the southern morphotype ranging from Alaska to Baja California. In this study, these two morphotypes were found to be distinct species, based on integrative taxonomic approach, incorporating both molecular and morphological analysis. Approaches included: (1) Bayesian inference and maximum-likelihood phylogenetic analyses based on concatenated gene sequences of the mitochondrial 16S, COI and the nuclear Histone H3 genes, (2) haplotype network via TCS based on COI sequences, (3) Automatic Barcode Gap Discovery (ABGD) based on 16s and COI, and (4) comparative internal and external morphological studies. Phylogenetic analyses revealed that the Triopha catalinae species complex clearly clustered into two clades, one including specimens of the northern morphotype and the other containing specimens of the southern morphotype. Two major groups as northern morphotype and southern morphotype were also recovered from both TCS haplotype network and ABGD analysis, which results supported the fact that T. catalinae is a species complex. Furthermore, these two clades display morphological differences in the dorsal tubercles and radula structure: the northern morphotype specimens possess relatively small and dendritic dorsal tubercles, two rows of arborescent tubercles on the dorso-lateral appendages of larger individuals, and the radular formulae are 19-24 ?? (9-12.5-10.R.5-10.9-12). On the contrary, specimens of the southern morphotype have relatively large, conical or rounded dorsal tubercles, and 48-79 ?? (16-18.17-33.R.17-33.16-18) radular formulae. The ABGD analysis confirmed that these two morphotypes constitute different species. A review of the literature (including original descriptions) and available type material, revealed that Triopha modesta Bergh, 1880 is the oldest available name for the northern morphotype, whereas T. catalinae is the valid name for the southern morphotype. Advisors/Committee Members: Vald??s, ??ngel (advisor), Bonisoli-Alquati, Andrea (committee member).

Subjects/Keywords: triopha catalinae

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jung, D. (2019). The return of the clown: Pseudocryptic speciation in the North Pacific clown nudibranch, Triopha catalinae (Cooper, 1863) s.l. identified by integrative taxonomic approaches. (Masters Thesis). California State Polytechnic University – Pomona. Retrieved from http://hdl.handle.net/10211.3/212974

Chicago Manual of Style (16th Edition):

Jung, Dae-Wui. “The return of the clown: Pseudocryptic speciation in the North Pacific clown nudibranch, Triopha catalinae (Cooper, 1863) s.l. identified by integrative taxonomic approaches.” 2019. Masters Thesis, California State Polytechnic University – Pomona. Accessed September 21, 2019. http://hdl.handle.net/10211.3/212974.

MLA Handbook (7th Edition):

Jung, Dae-Wui. “The return of the clown: Pseudocryptic speciation in the North Pacific clown nudibranch, Triopha catalinae (Cooper, 1863) s.l. identified by integrative taxonomic approaches.” 2019. Web. 21 Sep 2019.

Vancouver:

Jung D. The return of the clown: Pseudocryptic speciation in the North Pacific clown nudibranch, Triopha catalinae (Cooper, 1863) s.l. identified by integrative taxonomic approaches. [Internet] [Masters thesis]. California State Polytechnic University – Pomona; 2019. [cited 2019 Sep 21]. Available from: http://hdl.handle.net/10211.3/212974.

Council of Science Editors:

Jung D. The return of the clown: Pseudocryptic speciation in the North Pacific clown nudibranch, Triopha catalinae (Cooper, 1863) s.l. identified by integrative taxonomic approaches. [Masters Thesis]. California State Polytechnic University – Pomona; 2019. Available from: http://hdl.handle.net/10211.3/212974

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