A new North‐East Atlantic species of<i>Bacescomysis</i>(Mysidacea, Crustacea) with original moth‐like antennules

Casanova, J.-P.; Jong, Laetitia De

doi:10.1080/00222930400023784

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…nov. with species of Petalophthalmidae, all seven currently acknowledged bathyal to abyssal species of Bacescomysis and seven species of Hansenomysis show a non-incised, transverse eyeplate with well-developed horn-like extensions lacking visual elements. The remaining eleven species of Hansenomysis exhibit rounded, lappet-like or inconspicuous extensions (Faxon 1895;Băcescu 1971b;Lagardère 1983;Murano & Krygier 1985;Bravo & Murano 1997b;Casanova & de Jong 2005;San Vicente & Sorbe 2008). Due to the lack of visible sensory structures the horns and lappets are here interpreted as remnants of convergent eye reduction in dark, deep waters.…”

Section: Feeding and Deep-sea Adaptationmentioning

confidence: 96%

Lophogastrida and Mysida (Crustacea) of the “DIVA-1” deep-sea expedition to the Angola Basin (SE-Atlantic)

Wittmann

2020

EJT

712

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Three species of Lophogastrida and eight Mysida are documented for samples from 5161–5497 m bottom depth in the Angola Basin. Previously known latitudinal ranges are extended southward for five species, and bathymetric ranges extended beyond 5000 m for six species. Upon revision of the subfamily Petalophthalminae (Mysidae), four species previously attributed to the genus Petalophthalmus are integrated into Ipirophthalmus gen. nov. as I. liui gen. et comb. nov., I. caribbeanus gen. et comb. nov., I. oculatus gen. et comb. nov., and I. macrops gen. et comb. nov., mainly based on the structure of eyes and presence of setae on the telson. Petalophthalmus cristatus sp. nov. is described based on its reduced cornea and the structure of eyestalks, rostrum, mandibles, and telson. The structure of mouthparts, foregut and maxillipeds suggests an omnivorous mode of life. The diagnosis of the tribe Calyptommini (Mysidae: Erythropinae) is widened to cover the 3-segmented, uniramous fourth male pleopod and the non-incised eyeplate with horn-like rudiments of eyestalks in Abyssomysis cornuta gen. et sp. nov. The structure of mandibles, foregut, and second maxilliped suggest detritus feeding in this species. Keys to the Calyptommini and Petalophthalminae are given.

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Section: Feeding and Deep-sea Adaptationmentioning

confidence: 96%

Lophogastrida and Mysida (Crustacea) of the “DIVA-1” deep-sea expedition to the Angola Basin (SE-Atlantic)

Wittmann

2020

EJT

712

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“…Tattersall (1961) assumed a chemosensory function, based on the presence of small, rounded, stainable areas. Casanova & De Jong (2005) described this organ in Bacescomysis as a pit-like depression with circular aperture overlapped by a flap at the bottom and interpreted it with some reservation as a potential chemosensory organ.…”

Section: Antennular Depressionmentioning

confidence: 99%

First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

Wittmann¹,

Chevaldonné²

2021

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SCUBA diving explorations of three islands off Dumont d’Urville Station at the coast of Adélie Land, East Antarctica, enabled the observation of marine ice caves. Sampling in this unusual habitat yielded a total of three species of Mysidae, altogether previously poorly known or unknown to science. Pseudomma kryotroglodytumsp. nov. is described, based on the structure of the antennal scale, telson and on cornea-like lateral portions set off against the main body of eyeplates. Mysidetes illigi is re-established at species level after almost a century in synonymy. Re-descriptions are provided for M. illigi and M. hanseni, based on types and ice cave materials. Keys to the Southern Ocean species of Pseudomma and to the world-wide species of Mysidetes are given. Phylogenetic trees are provided for the genera Pseudomma and Mysidetes. 18S rDNA sequences of P. kryotroglodytum differ from GenBank sequences of other Pseudomma species. First sequence data are given for species of the genus Mysidetes: 18S differs between the two examined species and COI is quite diverse between and within species. We found previously unknown, probably sensorial structures in these ice cave species: in P. kryotroglodytum, the basal segment of the antennula shows a pit-like depression with striated pad on the bottom and a median cyst, connected with the bottom of the eyeplate cleft. M. illigi shows a female homologue of the appendix masculina bearing a field of modified setae. Subsequent investigations demonstrated these structures also in species from other habitats. The feeding apparatus and stomach contents of the three ice cave species point to brushing of small particles (detritus, microalgae) from available surfaces, such as sediment, rock and the ice surface. Differences in the feeding apparatus are very subtle between the two Mysidetes species. The high content of fat bodies in M. hanseni could help it to survive periods of starvation. The large storage volume of the foregut in P. kryotroglodytum points to the collection of food with low nutritional quality and could help to balance strongly fluctuating food availability. Summer specimens of M. hanseni showed a bimodal frequency of developmental stages in the marsupium and bimodal size-frequency distribution of free-living stages. The females with younger brood (embryos) were, on average, larger and carried more marsupial young than those with older brood (nauplioid larvae). All examined incubating and spent females showed (almost) empty foreguts and empty ovarian tubes, suggesting possible semelparity and death following the release of young. The absence of juveniles and immature females from summer samples suggests that growth and accumulation of fat and yolk occur outside ice caves, while such caves could be used by fattened adults as shelter for brooding. A provisional interpretation proposes a biannual life cycle for M. hanseni, superimposed with shifted breeding schedules, the latter characterised by early breeding and late breeding females, probably in response to harsh physical and trophic conditions along the continental coast of Antarctica.

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“…Moreover, recent studies on deep-sea assemblages from previously unexplored regions of the world are continuing to discovere new species of mysid , some belonging to the family Petalophthalmidae Czerniavsky, 1882 (Casanova and De Jong 2005;San Vicente and Sorbe 2008;Fukuoka 2009;San Vicente 2009, 2010aSan Vicente et al 2014).…”

Section: Introductionmentioning

confidence: 99%

A new bathyal mysid of the family Petalophthalmidae (Crustacea: Mysida) <br />from the Bismarck Sea (Western Tropical Pacific Ocean)

Vicente¹,

Corbari

2015

Zootaxa

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A new species of the genus Petalophthalmus (Crustacea: Mysida: Petalophthalmidae) is described, based on one specimen collected from the Bismarck Sea (Papua New Guinea, Western Pacific Ocean). This species can be distinguished from the other species of the genus Petalophthalmus by the globular cornea and the armature of the telson. This new species lives between 800 and 1065 m depth. A discussion on the geographic and bathymetric distribution and an identification key to world species of Petalophthalmus are provided.

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A new North‐East Atlantic species ofBacescomysis(Mysidacea, Crustacea) with original moth‐like antennules

Cited by 4 publications

References 9 publications

Lophogastrida and Mysida (Crustacea) of the “DIVA-1” deep-sea expedition to the Angola Basin (SE-Atlantic)

Lophogastrida and Mysida (Crustacea) of the “DIVA-1” deep-sea expedition to the Angola Basin (SE-Atlantic)

First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

A new bathyal mysid of the family Petalophthalmidae (Crustacea: Mysida) <br />from the Bismarck Sea (Western Tropical Pacific Ocean)

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A new North‐East Atlantic species ofBacescomysis(Mysidacea, Crustacea) with original moth‐like antennules

Cited by 4 publications

References 9 publications

Lophogastrida and Mysida (Crustacea) of the “DIVA-1” deep-sea expedition to the Angola Basin (SE-Atlantic)

Lophogastrida and Mysida (Crustacea) of the “DIVA-1” deep-sea expedition to the Angola Basin (SE-Atlantic)

﻿First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

A new bathyal mysid of the family Petalophthalmidae (Crustacea: Mysida) <br />from the Bismarck Sea (Western Tropical Pacific Ocean)

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First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species