Vol. 62, 2023
A New Paralepetopsis Limpet from a South
China Sea Seep Hints at a Paraphyletic Neolepetopsidae
Chen1,*, Zhaoyan Zhong2,
Jian-Wen Qiu3, and Jin Sun2
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2–15
Natsushima, Yokosuka 237–0061, Japan. *Correspondence: E-mail:
Evolution & Marine Biodiversity, Ocean University of China, Qingdao
266003, China. E-mail: email@example.com (Zhong);
3Department of Biology
and Hong Kong Branch of the Southern Marine Science and Engineering
Guangdong Laboratory (Guangzhou), Hong Kong Baptist University, 224
Waterloo Road, Hong Kong. E-mail: firstname.lastname@example.org (Sun)
(Received 20 June 2022 / Accepted 21
February 2023 / Published 26 May 2023)
Communicated by Benny K.K. Chan
Neolepetopsidae is a little-studied
true limpet family only known from deep-sea chemosynthetic ecosystems,
containing just over a dozen species in three genera: Neolepetopsis, Paralepetopsis, and Eulepetopsis. Although considered
monophyletic by a recent phylogenetic analysis, a lack of
Paralepetopsis sequence linked to morphology casts some uncertainty.
Here, we discovered a new species of Paralepetopsis
from the Haima methane seep in the South China Sea, described as Paralepetopsis polita sp. nov. The
new species is distinct from all other described Paralepetopsis by its smooth and
semi-transparent shell, combined with a radula exhibiting pluricuspid
teeth with two cusps. We tested its relationship with other
neolepetopsids using a molecular phylogeny reconstructed from the
mitochondrial COI gene,
revealing a surprising position nested within Lepetidae, a family with
a very different radula morphology. The clade containing lepetids and
our new species was recovered sister to other neolepetopsids with
sequence data available. This hints at a paraphyletic Neolepetopsidae,
suggests the neolepetopsid-type radula might not be exclusive to one
monophyletic group of limpets.
Key words: Cold seep, Deep sea,
Gastropoda, Mollusca, Phylogenetics.
Citation: Chen C, Zhong Z, Qiu JW, Sun J.
2023. A new Paralepetopsis
limpet from a South China Sea seep hints at a paraphyletic
Neolepetopsidae. Zool Stud 62:26.