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Open AccessArticle

The First Insight into the Patterns of Size and Shape Variation of a Microcerberid Isopod

1
Department of Life Science, Hanyang University, Wangsimni-ro 222, Sungdong-gu, Seoul 04763, Korea
2
Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania 7001, Australia
*
Authors to whom correspondence should be addressed.
Academic Editor: Kay Van Damme
Water 2021, 13(4), 515; https://doi.org/10.3390/w13040515
Received: 10 January 2021 / Revised: 4 February 2021 / Accepted: 12 February 2021 / Published: 17 February 2021
(This article belongs to the Special Issue Species Richness and Diversity of Aquatic Ecosystems)
Cryptic species are a biological phenomenon only recently recognized due to progress in molecular studies. They pose a significant challenge to conventional taxonomic work since these species manifest low morphological differences, but considerable genetic disparity. New taxonomic methods are in development but have yet to be tested for many animal groups. Isopods belonging to the suborder Microcerberidea are one such group. The Asian microcerberid isopod, Coxicerberus fukudai (Ito, 1974), is a major component of marine interstitial fauna with suspected cryptic species inhabiting Japan and Korea. We chose six Korean populations with high molecular interpopulations divergence and applied 2D landmark-based geometric morphometrics to cephalic sensilla, pleonal points, and male pleopod II. This quantitative approach allowed us to study interpopulation size and shape variations, morphospace structure, and whether the morphological pattern mirrored the genetic species. We determined that a high degree of interpopulation size variation significantly influences shape changes. Once we removed the allometric effect, the size-corrected male pleopod II shape variations yielded a new species, C. jangsaensis sp. nov. At the same time, we were able to resolve the C. fukadai species complex. View Full-Text
Keywords: crustacean; cryptic species; integrative taxonomy; marine interstitial; peracarida; reverse taxonomy crustacean; cryptic species; integrative taxonomy; marine interstitial; peracarida; reverse taxonomy
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    Doi: 10.5281/zenodo.4430488
    Link: https://zenodo.org/record/4430488#.X_sLzNgzaUk
    Description: Table S1: Specimens information examined in this study with accession numbers of NIBR as well as GPS addresses. The numbers parenthesized in Pleopod II Endopodite’s column indicate the specimen numbers. The accession numbers for Jangsa specimens include the holotype. Table S2: Accession numbers of sequences used in this study’s genetic analyses. Table S3: Centroid size of SD dataset employed for Figure 3A. The initials indicate the group examined, which are in the same order as that used in Figure 1. FG: females Gazin, MG: males Gazin, FS: females Sokcho, MS: males Sokcho, FD: females Dongho, MD: males Dongho, FT: females Detan, MT: males Detan, FJ: female Jangsa, MJ: males Jangsa, FI: females Imrang, MI: males Imrang.
MDPI and ACS Style

Kim, J.; Kim, J.; Lee, W.; Karanovic, I. The First Insight into the Patterns of Size and Shape Variation of a Microcerberid Isopod. Water 2021, 13, 515. https://doi.org/10.3390/w13040515

AMA Style

Kim J, Kim J, Lee W, Karanovic I. The First Insight into the Patterns of Size and Shape Variation of a Microcerberid Isopod. Water. 2021; 13(4):515. https://doi.org/10.3390/w13040515

Chicago/Turabian Style

Kim, Jeongho; Kim, Jaehyun; Lee, Wonchoel; Karanovic, Ivana. 2021. "The First Insight into the Patterns of Size and Shape Variation of a Microcerberid Isopod" Water 13, no. 4: 515. https://doi.org/10.3390/w13040515

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