10.6084/m9.figshare.11316407.v1
Ivana Karanovic
Ivana
Karanovic
Pham Thi Minh Huyen
Pham Thi Minh
Huyen
Hyunsu Yoo
Hyunsu
Yoo
Yuriko Nakao
Yuriko
Nakao
Akira Tsukagoshi
Akira
Tsukagoshi
Shell and appendages variability in two allopatric ostracod species seen through the light of molecular data
Brill Online
2019
East Asia
integrative taxonomy
geometric morphometrics
phylogeography
speciation
Paleontology
2019-12-23 09:51:20
Journal contribution
https://brill.figshare.com/articles/journal_contribution/Shell_and_appendages_variability_in_two_allopatric_ostracod_species_seen_through_the_light_of_molecular_data/11316407
<p>Ostracod
crustaceans are among the most abundant microfossil animals. Understanding
intra- and interspecific variability of their shell is of pivotal importance
for the interpretation of paleontological data. In comparison to appendages, ostracod
shell displays more intraspecific variability (in shape, size, and
ornamentation), often as a response to environmental conditions. Shell
variability has been studied with sophisticated methods, such as geometric
morphometrics (GM), but the conspecificity of examined specimens and
populations was never tested. In addition, there are no GM studies of appendages.
We build on previously published high cytochrome c oxidase subunit I (<i>COI) </i>divergence rates among populations
of a brackish water species, <i>Ishizakiella
miurensis</i> (Hanai, 1957). With landmark-based GM analyses of its shell and appendages,
and additional genetic markers (<i>ITS, 28S,
18S</i>), we test if the genetic variability is structured in morphospace. This
approach is the core of integrative taxonomy paradigm which has been proposed
to bring the gap between traditional taxonomy and other disciplines such as
evolutionary biology. The results show that it is the shell shape, and not the shape
of appendages, that mirrors the molecular phylogeny, and we describe a new
species. Our results suggest that the landmark-based GM studies may be useful in
paleontological datasets for closely related species delineation. We implement
molecular clock and population statistics to discuss speciation processes and phylogeography
of the two congeners in Korea and Japan.</p>