A new genus and species of Brychiopontiidae Humes, 1974 (Crustacea: Copepoda:Siphonostomatoida) associated with an abyssal holothurian in the NortheastPacific nodule province

Mahatma, Radith; Arbizu, Pedro Martínez; Ivanenko, Viatcheslav N.

doi:10.11646/zootaxa.1866.1.14

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…() reported an association between the tanaidacean Exspina typica and three species of abyssal holothurians, each with E. typica occupying the intestine or body cavity of the holothurian. In addition to associating with amphipods (Lindsay & Takeuchi, ) and copepods(Mahatma et al., ), polynoid worms have been described as commensal (Shields et al., ) and parasitic (Schiaparelli et al., ) companions of deep‐sea holothurians. The association of N. diomedeae with Scotoplanes appears unique in its apparent specificity to the juvenile crab life stage.…”

Section: Discussionmentioning

confidence: 99%

Symbiosis between the holothurian Scotoplanes sp. A and the lithodid crab Neolithodes diomedeae on a featureless bathyal sediment plain

et al. 2016

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Vulnerability to predation may be high for many megafaunal taxa in deep-sea sedimentary habitats where physical heterogeneity is low. During ROV observations in a bathyal sediment plain off Central California, juveniles of the lithodid crab Neolithodes diomedeae were frequently observed on or under the holothurian (sea cucumber) Scotoplanes sp. A, and are hypothesized to benefit from this association as a nursery or refugium from predation. Ninety-six percent (n = 574 of 599) of the juvenile N. diomedeae observed (density varied from 0.02-0.75/m 2 among sites and seasons) in the study area were associated with Scotoplanes sp. A. Of the 2596 Scotoplanes sp. A observed (density varied from 0.48 to 25.90/m 2 ), 22% were attended by at least one juvenile crab, and rarely two crabs (n = 4). Solitary N. diomedeae were rarely observed. This decapod-holothurian symbiosis appears to be largely commensal, with juvenile crabs (carapace width = 0.03-0.31 × holothurian length) observed on or beneath Scotoplanes sp. A in a habitat with few refugia from epibenthic predators. Other hypotheses may explain or enhance the potential benefits of the association for N. diomedeae, such as elevated food availability due to the activities of Scotoplanes sp. A. The relationship may be mutualistic if there is a benefit for the holothurian, including the removal of epizoic parasites. Ultimately, the nursery or other effects on the population dynamics of N. diomedeae may be minimal in low-relief, sediment-dominated habitats, as very few sub-adult crabs were observed in the study area and were likely consumed upon outgrowing their refugia.While sedimentary habitats may be a sink for N. diomedeae populations, growth of juvenile crabs during their association with Scotoplanes sp. A should increase energy flow to its predator populations. This association has not been reported previously but may be expected in sediment-dominated habitats where these species overlap. K E Y W O R D Sbenthic, deep-sea, Holothuroidea, Lithodidae, species interactions, symbiosis

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Section: Discussionmentioning

confidence: 99%

Symbiosis between the holothurian Scotoplanes sp. A and the lithodid crab Neolithodes diomedeae on a featureless bathyal sediment plain

et al. 2016

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“…The species Aphotopontius rapunculus Humes & Segonzac, 1998 is here transferred to the genus Rhogobius Humes, 1987 because it possesses the hypothesized derived features of this genus: last abdominal somite with lobes at sides of the anal operculum; second segment of the antennal endopod elongate and slender (Ivanenko & Defaye, 2006a). In addition, Rhogobius rapunculus (Humes & Segonzac, 1998), as well as its congeners R. contractus and R. pressulus : (1) possesses setal formula of leg 4 endopod (0-1; I) identical to all species of Aphotopontius ; and (2) lacks a seta of the coxal endite of the maxilla, an attribute that these species share with all species of Ceuthoecetes , Dirivultus and Nilva , as well as with most copepods of the order Siphonostomatoida (see Mahatma et al , 2008).…”

Section: Resultsmentioning

confidence: 99%

“…(1) possesses setal formula of leg 4 endopod (0-1; I) identical to all species of Aphotopontius; and (2) lacks a seta of the coxal endite of the maxilla, an attribute that these species share with all species of Ceuthoecetes, Dirivultus and Nilva, as well as with most copepods of the order Siphonostomatoida (see Mahatma et al, 2008). Table 4).…”

Section: Aphotopontius Temperatus Humes 1997mentioning

confidence: 99%

A new species ofExrima,synonymy of four species ofAphotopontius, StygiopontiusandRhogobius, and record of first copepodid stage of Dirivultidae (Copepoda: Siphonostomatoida) from deep-sea hydrothermal vents of the East Pacific Rise (13°N)

et al. 2011

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Females of the new speciesExrima walterisp. nov. were found in sediment trap samples deployed over different sites of the East Pacific Rise (13°N) at 2600 m depth. Four traps were deposited during the HOPE99 cruise (1999) and recovered during the AMISTAD (1999) cruise on the research vessel ‘L'Atalante’. The new species is distinguished from congeners,E. singulaHumes, 1987 andE. dolichopusHumes, 1987, by the following derived characters: first somite of the urosome with 3 (one dorsal and two lateral) stout conical extensions; distal endopodal segment on the swimming leg 4 broad. In addition, many specimens of copepodids I and lecithotrophic nauplii, identified as belonging to Dirivultidae gen. sp., were found in the samples of all sediment traps. This is the first record of copepodids I and of a nauplius of dirivultids from the Pacific Ocean. Study of type and additional material collected during different Ifremer cruises at different vent sites (HERO91, EXOMAR, PHARE and MoMARETO) required synonymy of four species ofAphotopontiusHumes, 1987,StygiopontiusHumes, 1987 andRhogobiusHumes, 1987.Aphotopontius rapunculusHumes and Segonzac, 1998 is transferred to the genusRhogobiusbecause it possesses all presumed derived attributes of this genus: last abdominal somite with lobes at sides of anal operculum; second segment of antennal endopod elongate and slender. A new study of the type material suggests that:Aphotopontius temperatusHumes, 1997 is a synonym ofA. atlanteusHumes, 1996;Stygiopontius lumigerHumes, 1989 is a synonym ofS. sentiferHumes, 1987 whileS. bulbisetigerHumes, 1996 is a synonym ofS. pectinatusHumes, 1987. Females of the three synonymized species were found to be sub-adult females at copepodid V. Leg 6 on these specimens is one seta located dorsolaterally on the posterior part of the genital somite. This position for leg 6 is unknown for copepodid V of other siphonostomatoids whose leg 6 is located ventrally at copepodid V; the dorsolateral position is presumed derived and shared by the dirivultid generaAphotopontiusHumes, 1987 andStygiopontiusHumes, 1987. A new key to the Dirivultidae genera is presented.

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“…Their symbiotic relationships with various echinoderm species taxa in diverse marine environments underscore their remarkable ecological adaptability and highlights the intricate network of biotic interactions in which copepods take part. On echinoderms, copepods of various families have been observed in association with Crinoidea (feather stars), Asteroidea (sea stars), Echinoidea (sea urchins), Holothuroidea (sea cucumbers), and Ophiuroidea (brittle stars) [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. The investigation of these interactions not only reveals the ecological significance of copepods but also contributes to a deeper understanding of the evolutionary mechanisms that underlie symbiosis within marine ecosystems [ 28 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

From Microscale Interactions to Macroscale Patterns in Copepod–Crinoid Symbiosis

Korzhavina,

Gubareva,

Kitashov

et al. 2024

Animals

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Crinoids (Echinodermata) exhibit unique morphological and behavioral characteristics that facilitate a wide range of symbiotic relationships with diverse organisms. Our comprehension of their interactions with microscopic copepod crustaceans is, however, still in a nascent and fragmented state. Here, we review and discuss the 166 literature records to date in which a total of 39 copepod species in 6 families have been reported in association with 33 species of the crinoid order Comatulida. Many of these associations have been reported just once. The respective localities cover 5 of the World Ocean’s 12 ecoregions, with a notable concentration of both host and symbiont diversity in the Central and Western Indo-Pacific. In contrast, the documentation of copepod–crinoid associations in the Atlantic appears markedly limited. Copepods have been found predominantly in ectosymbiotic relationships with crinoids, with a lower incidence of endosymbiosis. Copepods of the genera Collocheres Canu, 1893 and Pseudanthessius Claus, 1889 are particularly prominent in the list, and the comatulid family Comatulidae displays the most diverse assortment of copepod associations. The current scope of knowledge encompasses a mere 5% of the potential crinoid host diversity, underscoring the need for more extensive research in this area.

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A new genus and species of Brychiopontiidae Humes, 1974 (Crustacea: Copepoda:Siphonostomatoida) associated with an abyssal holothurian in the NortheastPacific nodule province

Cited by 7 publications

References 17 publications

Symbiosis between the holothurian Scotoplanes sp. A and the lithodid crab Neolithodes diomedeae on a featureless bathyal sediment plain

Symbiosis between the holothurian Scotoplanes sp. A and the lithodid crab Neolithodes diomedeae on a featureless bathyal sediment plain

A new species ofExrima,synonymy of four species ofAphotopontius, StygiopontiusandRhogobius, and record of first copepodid stage of Dirivultidae (Copepoda: Siphonostomatoida) from deep-sea hydrothermal vents of the East Pacific Rise (13°N)

From Microscale Interactions to Macroscale Patterns in Copepod–Crinoid Symbiosis

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