Fusceulimoides kohtsukai gen. et sp. nov., a Minute Eulimid Gastropod Parasitic on the Little Brittle Star Ophiactis savignyi in Central Japan

Takano, Tsuyoshi; Kano, Yasunori; Mogi, Takanobu; Okanishi, Masanori

doi:10.2108/zs220050

Cited by 3 publications

(4 citation statements)

References 36 publications

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“…Molecular phylogenetic study of Eulimidae have confirmed that the host's class rather than shell shape tends to reflect intrafamilial relationships (Takano and Kano, 2014; Takano and Goto, 2021). However, ophiuroid-parasitic species were recovered as polyphyletic groups with Fusceulimoides distantly related to Eulima + Hemiliostraca + Pyramidelloides (Takano and Goto, 2021; Takano et al ., 2023). Species of Eulima , Hemiliostraca , and Pyramidelloides have a brownish protoconch, whereas the protoconch of Fusceulimoides is white (Warén, 1983a, 1983b; Takano et al ., 2023; T. Takano, pers.…”

Section: Discussionmentioning

confidence: 99%

“…However, ophiuroid-parasitic species were recovered as polyphyletic groups with Fusceulimoides distantly related to Eulima + Hemiliostraca + Pyramidelloides (Takano and Goto, 2021; Takano et al ., 2023). Species of Eulima , Hemiliostraca , and Pyramidelloides have a brownish protoconch, whereas the protoconch of Fusceulimoides is white (Warén, 1983a, 1983b; Takano et al ., 2023; T. Takano, pers. obs.).…”

Section: Discussionmentioning

confidence: 99%

“…Among ophiuroid-parasitic eulimids above, species of Eulima , Hemiliostraca , and Pyramidelloides possess the radula (Warén, 1983a; 1983b). The anatomy of Fusceulimoides has not been investigated, while this genus is nested in the radula-less clade and thus probably lacks the radula (Takano et al ., 2023). In this view, the absence of the radula in the type species O. minima (Warén and Sibuet, 1981) suggests its close affinity to Fusceulimoides .…”

Section: Discussionmentioning

confidence: 99%

“…At least 14 eulimid genera are known to contain ophiuroid-parasitic species. These genera include Ersilia Monterosato, 1872, Eulima Risso, 1826, Fuscapex Warén, 1981, Fusceulimoides Takano, Kano, Mogi and Okanishi, 2023, Hemiliostraca Pilsbry, 1917, Mucronalia A. Adams, 1860, Ophieulima Warén and Sibuet, 1981, Ophioarachnicola Warén, 1980, Ophiolamia Warén and Carney, 1981, Punctifera Warén, 1981, Pyramidelloides G. Nevill, 1885, Sticteulima Laseron, 1955, Stilapex Iredale, 1925, and Vitreolina Monterosato, 1884 (Warén, 1980, 1981, 1983a, 1983b; Bouchet and Warén, 1986; Dgebuadze, 2014; Takano et al ., 2023).…”

Section: Introductionmentioning

confidence: 99%

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First occurrence of ophiuroid-parasitic genus Ophieulima (Mollusca: Gastropoda: Eulimidae) in the North Pacific Ocean

Takano,

Kohtsuka,

Okanishi

2024

J. Mar. Biol. Ass.

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A eulimid gastropod of the genus Ophieulima, parasitic on the disc of the ophiactid brittle star Ophiactis dyscrita, was collected from 256–343 m deep off Kanagawa, central Japan. This represents the first record of the genus from Japanese waters and even from the North Pacific Ocean. Here we describe it as Ophieulima yoshiharai n. sp. The generic assignment is justified by its conchological characters including (1) a small, conical shape with convex teleoconch whorls, (2) many fine growth lines and some strong growth pause scars on the teleoconch, (3) a well-developed, twisted columella, and (4) a multispiral, brownish transparent protoconch. Ophieulima yoshiharai n. sp. is distinguishable from the three (two named and one undescribed) extant, as well as two fossil congeners by its slender shell with the length of 2.1 times larger than width, a small aperture and a protoconch of 3.5 whorls. The new species is also characterized by its bathymetric distribution, which is shallower than the extant species of Ophieulima. On the other hand, the hosts of Ophieulima species are so far restricted to ophiuroids of the genus Ophiactis and the three named species have mostly been found attached to the lateral and/or dorsal sides of the host's disc, suggesting their similar parasitic ecology.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

First occurrence of ophiuroid-parasitic genus Ophieulima (Mollusca: Gastropoda: Eulimidae) in the North Pacific Ocean

Takano,

Kohtsuka,

Okanishi

2024

J. Mar. Biol. Ass.

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Habitat selection in two species of Eulimidae (Mollusca: Gastropoda) parasitic on the black sea cucumber Holothuria atra

Takano,

Hasegawa-Takano,

Inoue

2023

Hydrobiologia

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Melanella martarum sp. nov. (Gastropoda: Eulimidae): the first parasitic deep-sea snail reported for the Salas & Gomez Ridge

de Souza,

Asorey,

Sellanes

2024

PeerJ

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Eulimidae is a highly diverse family of gastropods that are often parasites of echinoderms. They are cosmopolitan and live from the intertidal to great depths. Despite its wide geographic and bathymetric distribution, no species of Eulimidae have been reported for the Salas & Gómez Ridge to date. In this study, we describe Melanella martarum sp. nov., which was collected during the EPIC oceanographic cruise onboard RV Mirai (JAMSTEC, Japan) in 2019. Seven specimens were collected with a modified Agassiz trawl on the summit of seamount “Pearl” (Zhemchuznaya) in the Salas & Gómez Ridge (25.59°S, 89.13°W) at 545 m depth. The morphology of M. martarum sp. nov. was compared with other Melanella species reported for the area, including Chile and Rapa Nui. DNA was extracted and partial sequences of the mitochondrial genes Cytochrome Oxidase 1 (COI) and 16S rDNA, and the nuclear gene Histone 3 (H3) were sequenced. Melanella martarum sp. nov. has morphological characteristics that separate it from other species of Melanella, such as the thickness and color of the shell, and the shape of the protoconch. In addition, M. martarum sp. nov. was genetically differentiated from other Melanella spp. sequences (uncorrected p distances from 18,1–8.6% in mitochondrial COI and 16S rDNA to 3% in nuclear H3 sequences). Although there is not much molecular data available for Eulimidae, the phylogenetic analysis confirms the results obtained by morphology, placing the species found on the Salas & Gómez Ridge within the genus Melanella. The current study advances the understanding of the poorly known benthic fauna found on seamounts in the easternmost part of the Sala & Gómez ridge, a location distinguished by a high level of endemism.

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Fusceulimoides kohtsukai gen. et sp. nov., a Minute Eulimid Gastropod Parasitic on the Little Brittle Star Ophiactis savignyi in Central Japan

Cited by 3 publications

References 36 publications

First occurrence of ophiuroid-parasitic genus Ophieulima (Mollusca: Gastropoda: Eulimidae) in the North Pacific Ocean

First occurrence of ophiuroid-parasitic genus Ophieulima (Mollusca: Gastropoda: Eulimidae) in the North Pacific Ocean

Habitat selection in two species of Eulimidae (Mollusca: Gastropoda) parasitic on the black sea cucumber Holothuria atra

Melanella martarum sp. nov. (Gastropoda: Eulimidae): the first parasitic deep-sea snail reported for the Salas & Gomez Ridge

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