Chen C.L. & Chan T.Y. 2023. The use of three-dimensional uCT imaging technique in the description of a new species of Stenopus Latreille, 1819 (Decapoda: Stenopodidea: Stenopodidae), with a revised key to the species of Stenopus. Journal of Crustacean Biology 43(3): ruad041. DOI:10.1093/jcbiol/ruad041 ???msg.biblio.abstract.label???[+][-]
Members of the shrimp genus Stenopus Latreille, 1819 generally inhabit shallow-water coral reefs. Individuals are colorful, with many of them highly sought in the aquarium trade. A recent biodiversity cruise to the Saya de Malha Banks in the western Indian Ocean collected a new species of Stenopus from rather deep waters, at 192–216 m depth. This species is unusual in having a long rostrum overreaching the scaphocerite and a red and white color pattern, unique for Stenopus. A badly damaged specimen from French Polynesia likely belongs to the new species. The characteristics of the new species are illustrated by X-ray microcomputed tomography images (uCT imaging), line drawings, and color photographs. A key is also provided for the 12 known species of Stenopus.
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IU (Crustacés)
Nappo A. & Cilia D.P. 2025. Taxonomic review of the genus Korrigania Sanders et al., 2020 including a new species description, with comments on Tritonoranella Oyama, 1964 (Gastropoda: Bursidae). Bollettino Malacologico 61(1): 18-55. DOI:10.53559/BollMalacol.2024.17 ???msg.biblio.abstract.label???[+][-]
The taxonomic status of Korrigania Sanders et al., 2020, of the family Bursidae Thiele, 1925, is reviewed. Prior to the present work, the genus included five recent species that demonstrate considerable morphological variation. Herein, the new species Korrigania stefanoelisa n. sp., from New Caledonia and Vanuatu, is added, and K. vianelloi Cossignani, 2023, so far only known from the Philippines, is designated as synonym of K. awatii (Ray, 1950) n. syn. The main morphological characters of Korrigania are described, together with those of the species included. Bursa humilis Beu, 1981 and Bursa natalensis Coelho & Matthews, 1970 are accepted as Tritonoranella humilis (Beu, 1981) n. comb. and Tritonoranella natalensis (Coelho & Matthews, 1970) n. comb.
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IM (Mollusques)
Palacios Theil E. & Błażewicz M. 2024. Distribution of species in deep-sea biogeographic provinces and molecular phylogeny for the superfamily Neotanaoidea (Peracarida; Tanaidacea) indicate high levels of connectivity. Frontiers in Marine Science 11: 1395000. DOI:10.3389/fmars.2024.1395000 ???msg.biblio.abstract.label???[+][-]
Here we analyze available recorded occurrences for species of Neotanaoidea, a deep-sea peracarid superfamily, in the frame of biogeographic bathyal, abyssal, and hadal provinces. In addition, we provide the first phylogeny based on molecular data for this group. Despite the existence of large knowledge gaps, the observed patterns reveal levels of connectivity across biogeographic provinces, oceans, and depths higher than initially expected for a superfamily consisting of relatively small deep-sea benthic invertebrates without a pelagic larval stage, and therefore hypothetically low mobility capabilities. We have detected neotanaid species with closely related populations across the Pacific Ocean or able to overpass a geographical barrier as significant as the Mid-Atlantic Ridge. Additionally, the molecular analyses expose the need for a taxonomic review of the four genera within Neotanaoidea. A search for better suited morphological and possibly ecological characters as diagnostic traits for genera and species should be undertaken, aiming at a better definition of the existing taxa and the description of new ones.
The only revision of Iphione was made by Pettibone in 1986, who recognized four species including two newly described in that work: I. muricata (Savigny in Lamarck, 1818) (type species), I. ovata Kinberg, 1856, I. treadwelli Pettibone, 1986, and I. henshawi Pettibone, 1986. She included I. fimbriata de Quatrefages, 1866, I. glabra de Quatrefages, 1866, and I. fustis Hoagland, 1920 within I. muricata, and I. spinosa Kinberg, 1856 and I. hirotai Izuka, 1912 in I. ovata. Three other species were later added to the genus: I. reticulata Amoureux, Rullier & Fishelson, 1978 from the Red Sea, I. coriolis Hanley & Burke, 1991 from the Coral Sea, and I. malifera Piotrowski, 2014 from the Philippines. A recent contribution showed that I. ovata ranges from the Red Sea to the Eastern Pacific and includes I. spinosa and I. reticulata. Our objectives were to revise the genus, evaluating all species and describing new ones by assessing the relevance of morphological features, assisted in part with COI sequence data. We studied the morphology of type and non-type material from 18 institutions and sequenced 52 specimens representing 11 species. We found that the size and position of eyes, the size relationships between cephalic appendages, and the number of rows of macrotubercles in elytra vary with body size. The most relevant diagnostic features for species delineation, confirmed by genetic species delineation, are the type and size relationships of macrotubercles, the presence of fimbriae, the development of the basal tubercle of dorsal cirrophores, the type of neurochaetae (falcate versus acicular), and their tips (uni- vs bidentate; or simple vs hooded). We clarified the type species of the genus as I. ovata, and recognized 17 species, nine previously described and eight new. Our main results include: 1) the restriction of I. muricata; 2) the reinstatement of I. fimbriata including I. fustis; 3) redescriptions of I. coriolis, I. henshawi and I. treadwelli; and 4) the description of eight new species: I. ankeri sp. nov. from Guam, I. corbari sp. nov. from the Saya de Malha Bank, I. harrisae sp. nov. from French Polynesia, I. hourdezi sp. nov. from New Caledonia, I. hyndmani sp. nov. from Hong Kong, I. readi sp. nov. from the Red Sea (including many earlier records of I. muricata), I. richeri sp. nov. from New Caledonia, and I. wilsoni sp. nov. from Australia. Descriptions the eight newly described species include only one based upon a single specimen. Keys are included for the genera in the family, and species of Iphione.
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IA (Annélides, Polychètes et Sipunculides)
Vilvens C. 2024. New species and new records of Calliostomatidae (Gastropoda: Trochoidea) from Mozambique Channel, Madagascar, Réunion and Saya de Malha. Novapex 25(4): 173-200
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IM (Mollusques)
Wong M.K. & Chen W.J. 2024. Exploring the phylogeny and depth evolution of cusk eels and their relatives (Ophidiiformes: Ophidioidei). Molecular Phylogenetics and Evolution 199: 108164. DOI:10.1016/j.ympev.2024.108164 ???msg.biblio.abstract.label???[+][-]
With 289 known species in 51 genera, the ophidiiform family Ophidiidae together with their relatives from the Carapidae (36 species in eight genera) of the same suborder Ophidioidei dominate the deep sea, but some occur also in shallow water habitats. Despite their high species diversity in the deep sea and wide bathymetric distributions, their phylogenetic relationships and evolution remain unexplored due in part to sampling difficulties. Thanks to the biodiversity exploratory program entitled “Tropical Deep-Sea Benthos” and joint efforts between Taiwan and French teams for sampling from different localities across the Indo-West Pacific over the last two decades, we are able to compile comprehensive datasets for investigations. In this study, 59 samples representing 36 of 59 known ophidioid genera are selected and used to construct a multi-gene dataset to infer the phylogenetic relationships of ophidioid fishes and their relatives. Our results reveal that the Ophidiidae forms a paraphyletic group with respect to the Carapidae. The four main clades of Ophidioidei resolved are the (1) clade comprising species from the subfamily Brotulinae; (2) clade that includes species in the genera Acanthonus and Xyelacyba; (3) clade grouping Hypopleuron caninum with species from the family Carapidae; and (4) clade containing the species in the subfamily Brotulotaenilinae, Neobythitinae (in part), and Ophidiinae. Accordingly, we suggest the
following new revisions based on our results and proposed morphological diagnoses. The subfamily Brotulinae
should be elevated to the family level. The genera Xyelacyba and probably Tauredophidium (unsampled in this
study) should be included in the newly established family Acanthonidae with Acanthonus. The families Carapidae
and Ophidiidae are re-defined. Our time-calibrated phylogenetic and ancestral depth reconstructions enable us to
clarify the evolutionary history of ophidiiform fishes and infer past patterns of species distributions at different
depths. While Ophidiiformes is inferred to have originated in shallow waters around 96.25 million years ago
(Mya), the common ancestor to the Ophidioidei is inferred to have invaded the deep sea around 90.22 Mya, the
dates coinciding with the global anoxic event of the OAE2. The observed bathymetric distribution patterns in
Ophidioidei most likely point to the mesopelagic zone as the center of origin and diversification. This was followed by multiple events of depth transitions or range expansions towards either shallower waters or greater depth zones, which were likely triggered by past climate changes during the Paleogene-Neogene.