Species Of Tanaidacea Research Articles

New species of Tanaidacea from Cretaceous Kachin amber, with a brief review of the fossil record of tanaidacean crustaceans

Tanaidaceans are benthic, mostly marine, crustaceans that live burrowed in the substrate or in self-built tubes. The fossil record of Tanaidacea reaches back to the Carboniferous, 350 million years ago, but it is especially species-rich in Cretaceous amber sites from Spain and France. We report and formally describe a new species of Tanaidacea from 100-million-year-old Kachin amber, from the Hukawng Valley, Northern Myanmar, the first record of Cretaceous tanaidaceans outside Europe. The combination of character states of Tanaidaurum kachinensisgen. nov. et sp. nov. suggests that the new species is a representative of the early diversification of an unnamed group (Paratanaoidea+Tanaidoidea), an ingroup of the monophyletic group Tanaidomorpha. We briefly review the biased fossil record of Tanaidacea and present its abundance in European amber sites.

A new genus and species of Tanaidacea (Crustacea, Apseudomorpha) from the Upper Cretaceous (Cenomanian-Turonian) of Gara Sbaa, southeastern Morocco

We report Afroapseudes cretacicus n. gen., n. sp. (Tanaidacea Dana, 1849; Apseudomorpha Sieg, 1980) from the Upper Cretaceous (Cenomanian-Turonian) of the Gara Sbaa layers (southeastern Morocco). The new species is considered as a possible lineage between the Jurassic and the more recent Paleogene Apseudomorpha, partially covering the wide gap of tanaidacean fossil records between Mesozoic and Cenozoic forms. At the same time, this results to be the first fossil record of a tanaidacean from Africa, enlarging the scarce knowledge on the real diversity and distribution of this poorly reported crustacean group during the geological times.

A new family, genus and species of Tanaidacea (Crustacea; Apseudomorpha) from the Lower Cretaceous (Aptian) of Chiapas, Mexico: Systematic revisions , including designation of two new Paleozoic families, and paleoenvironmental observations

A new fossil apseudomorphan tanaidacean, Protoapseudoides espinalensis gen. et n. sp., from the Chiapas Region of Mexico, is described and placed within the new monotypic family Protoapseudoidae. Its description is based on more than 1000 specimens collected from the Lower Cretaceous (Aptian) in laminar dolomites from the El Espinal quarries (Sierra Madre Formation). The presence of a telsonic somite partially fussed, but ventrally distinct indicates that the body form of this new tanaidacean may represent a transitional evolutionary step between fossil Anthracocaridomorpha and the extant Apseudomorpha. The presence of an apparently fused, but a ventrally delineated telsonic somite indicates that the new family may represent a transition of an anthracocaridomorphan to an apseudomorphan body form. A new family, the Protoapseudoidae, is designated to accommodate the unique combination of morphological features exhibited by the new Chiapas species. These features include the presence of a vestigial telson, a blunt subtriangular rostrum, vestigial anterolateral processes on the carapace, and a single male genital cone, coupled with the absence of eye stalks, coxal spine on the first pereopod, and spines or lateral processes on carapace and pereon. This combination of characters distinguishes the new family from all the other known extinct and extant families within the Order Tanaidacea. Though clearly indicated ventrally, unlike the Anthracocaridomorphan, the vestigial telsonic somite of new Chiapas family appears not to be “independent” or “articulated,” and is functionally fused with pleonite-6 to form a pleotelson. Accordingly, the new family is tentatively placed within the suborder Apseudomorpha. The Protoapseudoidae appears, at least superficially, to have possible affinities with both the Paleozoic genus Ophthalmapseudes and to the members of the extant parapseudid Discapseudes-Halmyrapseudes Complex. The Paleozoic monotypic, anthracocaridid genera Eucryptocaris and Ophthalmapseudes, due to their unique morphological features and temporal distances, are hierarchized to family rank. As Eucryptocaridae n. fam. and Ophthalmapseudidae n. fam. Due to their based similarity, the superfamily Jurapseudoidea, is considered a junior synonym of the superfamily Apseudoidea. The possible relationship between the extinction of Protoapseudoidae and the emergence of parapseudid tanaidaceans in Americas is discussed. The morphological changes recorded between the Cretaceous fossil tanaidaceans, including the review of those 25 species as far known, and their extant relatives are considered to propose the timelines on the evolution of different tanaidacean morphotypes. Also, here are discussed the taphonomic and paleoenvironmental Condition that allow the fossil preservation of tanaidaceans.

Two new species of paratanaoid tanaidaceans of the family incertae sedis (Crustacea: Peracarida) from polymetallic nodule fields in the eastern Clarion-Clipperton Fracture Zone.

This study describes a new genus and two new species of Tanaidacea that were collected from the Singaporean exploratory area (OMS) of the polymetallic nodule fields in the eastern end of the Clarion-Clipperton Fracture Zone, Pacific Ocean. The descriptions are based on material collected during the research cruise ABYSSLINE II, which was conducted in the year 2015, covering abyssal depths of 4041-4227 m. These new species are paratanaoideans belonging to the genera Unispinosus n. gen. and Portaratrum Guerrero-Kommritz, 2003 of the family incertae sedis.

Xenosinelobus balanocolus, a new tanaidid genus and species (Crustacea: Peracarida: Tanaidacea) from barnacles on intertidal rocky shores and seawalls in the Singapore Strait.

This study describes a new genus and new species of Tanaidacea that was collected from inside the tests of dead Tetraclita barnacles in Singapore. Xenosinelobus n. gen. is most similar to Sinelobus but can be distinguished by the (1) unusually short antennal fifth article, (2) tooth-like lacinia mobilis on right mandible, (3) long terminal seta on epignath, (4) plumose inner seta near dactylus insertion on cheliped propodus, (5) spiniform seta on pereopod 1 coxa, (6) presence of setae on inner margins of pereopod 1 propodus and dactylus, (7) claw-like terminal articles on pereopods 2 and 3, (8) row of setulose and flattened denticulate setae along distal margin of pereopod 6 propodus, (9) dorsal seta on claws of pereopods 4-6, (10) complete row of dorso-transverse setae on pleonites 1 and 2, (11) one seta on pleopod basis outer margin, (12) two or three setae on pleopod endopod inner margin and (13) three-articled uropod with final article 1.6 times as long as preceding article. A new diagnosis and key to genera is provided for the subfamily Sinelobinae.

Re-evaluation of Morphological Diagnostic Characteristics of Hexapleomera Dudich, 1931 (Crustacea: Tanaidacea), with Description of a New Species

An undescribed species of Tanaidacea was collected from Yokji Harbor in the southern coast of Korea. Hexapleomera yokjidona n. sp. can be distinguished from other species of the genus by the distinguishing features of a uropod with five articles, a pleopod basal article lacking inner seta, a mandible setal row with two setae, maxilliped coxa with two proximal setae, pereonites 1–3 together longer than wide, and pereopods 2–3 propodus with three ventral setae. To prove that H. yokjidona is a new species, detailed morphological characteristics of both genders are described and a comprehensive comparison among the species of the genus is tabulated. Additionally, diagnostic characteristics previously used to identify the species of Hexapleomera are reassessed and upgraded.

Two new species of Colletteidae (Crustacea: Tanaidacea: Tanaidomorpha) from Bransfield Strait, Antarctica

Samples from deep benthic areas in the Bransfield Strait, Antarctica, revealed the presence of two new species of Colletteidae: Filitanais elongatus sp. nov. and Macrinella lavradoae sp. nov. Filitanais elongatus sp. nov. resembles F. moskalevi in its habitus; it can, however, be distinguished by characters such as the pleonites and pleotelson with lateral margins parallel and the uropod exopod being longer than half of the first endopod article. Macrinella lavradoae sp. nov. differs from the other species of Macrinella in the shape of the uropod and the pleotelson, with the uropod exopod shorter than the first article of the endopod, the uropod about as long as the pleotelson and the pleotelson with a rounded tip. The number of species of Tanaidacea recorded from Antarctica increases to 162, while the colletteids are now represented by 16 species. Moreover, the diagnosis of the genus Filitanais is herein modified.

A new species of the genus Apseudomorpha Miller (Crustacea, Peracarida, Tanaidacea) from Korea

A new species of Tanaidacea is described from the eastern coast of Korea, under the name of Apseudomorpha magna in the family Metapseudidae. The new species can be distinguished from its congeners by the following combination of characters: pleonites 2 and 5 and pleotelson have a large lateral seta; pleopods are biramous, in five pairs, each bearing a two-segmented exopod and a single-segmented endopod; the maxillular palp is two-segmented, with five setae on its distal segment; the pleotelson has a large seta on each anterolateral process; and the mandibular palp has 2, 7, and 13 setae on the first to third segments, respectively.

New data on the Tanaidacea (Crustacea: Peracarida) from the Canary Islands, with a description of a new species of Apseudopsis.

Benthic samples from two harbours at El Hierro and Tenerife (Canary Islands) yielded three species of Tanaidacea. Tanais dulongii and Leptochelia savignyi are recorded for the first time in Tenerife and El Hierro, respectively. A new species of Apseudomorpha, Apseudopsis rogi, was collected in both harbours and can be differentiated from other species of the genus by the male having a cheliped merus with a distinctive, cylindrical dorso-proximal spur. This is the first species of Apseudopsis described for the Macaronesian region. A key to the Atlantic and Mediterranean species of Apseudopsis is provided.

A new genus of Colletteidae (Crustacea: Peracarida: Tanaidacea) from the Pacific with comments on dimorphic males with species specific characters

A new genus and species of Tanaidacea are described from the manganese nodule province between the Clarion and the Clipperton Fracture Zone of the equatorial North Pacific Ocean collected during the French/German BIONOD expedition in 2012. The new genus,Cheliasetosatanais, can be diagnosed by the propodal and dactylus setation and the maxilliped endite armament. The male is also described and, while being a dimorphic swimming male, still shares the diagnostic characters and posseses a fully functional maxilliped.

Tanaidacea (Crustacea) from Macaronesia III. The shallow-water Tanaidomorpha from the Cape Verde archipelago

Three new species of Tanaidacea are described from the Cape Verde archipelago in the Mid-Atlantic, collected during thesampling program of the Laboratory of Marine Community Ecology and Evolution (LMCEE) to Macaronesia and formerPortuguese colonies. The new species belong to the tanaidomorphan families Leptocheliidae (Leptochelia parasavignyi), Paratanaidae (Paratanais vicentetis), and Pseudotanaidae (Pseudotanais Akanthinotanais breviaquas).

Tanaidacea (Crustacea) from Macaronesia II. The deep-water fauna from the Azores archipelago, Portugal

As part of Portugal’s bid for extending the country’s exclusive economic zone, the EMEPC collection program wasinitiated. From this program several new species of Tanaidacea have been collected during various expeditions. In thispaper three new species of Tanaidacea are described from the Azores archipelago in the Mid-Atlantic, Portugal. Two ofthem belong to the apseudomorphan genera Leviapseudes (L. macaronesia), Pseudosphyrapus (P. azorensis), and another new species belong to the tanaidomorphan genus Paratanais (P. pseudomartinsi).

Tanaidacea (Peracarida) from Macaronesia I. The deep-water fauna off the Selvagen Islands, Portugal

Three new species of Tanaidacea are described from the Portuguese Selvagen Islands in the Mid-Atlantic, and collected during the EMPC expedition on board the “N.R.P. Almirante Gago Coutinho” in the summer of 2010. The new species belong to the tanaidomorphan genera,Bathyleptochelia,Pseudoarthrura, andTyphlotanais.

The tanaidacean assemblage from the Central Pacific Manganese Nodule Province. II. The genera Stenotanais and Typhlotanais (Crustacea)

Three new species of Tanaidacea are described from the manganese nodule province between the Clarion and the Clipperton Fracture Zone of the equatorial North Pacific Ocean. The specimens were collected during the Nodinaut expedition on board the r/v l´Atalante in the summer of 2004. The new species belongs to the genera Stenotanais (S. arenasi) and Typhlotanais (T. froufesae, T. pereosetulosa). Stenotanais arenasi is believed to be the first male Stenotanais reported. A key to the genus Stenotanais is presented. The anterior pleopods of T. pereosetulosa were found to be dissimilar from the posterior.

Discovery of a new genus of tanaidacean (Crustacea: Tanaidacea: Mirandotanaidae) found associated with a deep-sea terebellid polychaete

Only one species of Tanaidacea, Expina typica, has been hitherto reported as an endosymbiont; it was recovered from the body cavity of deep-sea holothurians. During a survey of the deepsea benthic community in the Florida Straits off the Bahamas, Terebellatanais floridanus, a new genus and species of a tanaidomorphan tanaidacean was recovered at a depth of 545 m from the oral cavity of the terebellid polychaete Biremis blandi. Terebellatanais gen. nov. is tentatively assigned to the family Mirandotanaidae, as it appears to have affinities with Mirandotanais and Pooreotanais but also with Expina. It is distinguished from these genera by a unique combination of characters, including four antennular and antennal articles, a naked endite of the maxillipedal basis, hook-like chelipeds, the armature of the pereopods, and characters of the mouthparts. Most of the specimens of T. floridanus examined are mancas, but some were distinctly larger and with a different development of the last pereopod, thus suggesting that at least two manca stages are represented. The occurrence of the new genus and species within the oral cavity of B. blandi, its peculiar morphology, and the absence of fully grown adults, suggest that T. floridanus may be a symbiont of Biremis blandi at least during part of its development. Whether this relationship is commensal or parasitic remains to be determined.

Shallow water tanaidaceans (Crustacea: Peracarida: Tanaidacea) from New Caledonia and the Loyalty Islands

The Pacific collections by the MUSORSTOM campaigns of the Paris Museum over the last twenty years include a total of four species of Tanaidacea from shallow waters of the New Caledonia region and all new to science. These species are described herein, one in the family Tanaidae, Zeuxo (Parazeuxo) cloacarattus, and three in the family Leptocheliidae, viz. Pseudoleptochelia bulbus, the second Pacific species recorded for this genus, a species of the Leptochelia minuta agg. represented only by males, and a species with unusual cheliped carpus morphology which is placed in a new genus as Konarus cheiris.

Singularia Cuncta N. Gen., N. Sp. (Tanaidacea: Tanaidomorpha) from Antarctic Abyssal Waters

Abstract A new species of Tanaidacea from the Antarctic abyssal is diagnosed and described. It has been classified to new genus Singularia, although, at present, it cannot be assigned to any of the families established by Larsen and Wilson (2002). The genus has many characters found in the family Colletteidae Larsen and Wilson, 2002. The original key to genera of Colletteidae is presented.

Biodiversity of peracarid crustaceans(Malacostraca) from the shelf downto the deep Arctic Ocean

During three expeditions with the RVs Meteor and Polarstern more than sixty thousand peracarids were sampled from the deep Arctic Ocean (northern North Atlantic) by means of an epibenthic sledge. Sampling areas were the Kolbeinsey Ridge north of Iceland (800–1100 m), the Northeast Water Polynya, off Greenland (45–517m), and 75°N east of Greenland (197–2681m). Until now 288 species of Peracarida have been identified to species level. These 288 species comprise 152 genera and 59 families of Amphipoda, Cumacea, Isopoda, Mysidacea and Tanaidacea. Thirty-eight genera were very frequent and were sampled at each expedition (these were 22 species of Isopoda, seven species of Cumacea, three species of Amphipoda and Mysidacea, each, and two species of Tanaidacea). Sixty genera are eurybathic, occurring at least over a depth range of 1000m, some even from the shelf up to 2681m depth. Only 10 genera are stenobathic, occurring only in the deep sea. No significant decrease in species number with depth or latitude could be observed. The influencing factors probably causing different community structures are diverse, ranging from food availability over substrate or hydrographical qualities to interspecific competition.

Ecological studies on intertidal and infralittoral brazilian tanaidacea (crustacea, peracarida)

Summary Three species of Tanaidacea were found on the intertidal and shallow infralittoral at Enseada do Flamengo, Ubatuba, southeastern Brazil. Their vertical and horizontal distributions, as well as their density, seasonal variation and constancy are studied in relation to substrate and degree of exposure to wave action. Leptochelia savignyi and Teleotanais sp. have their vertical distribution from the midlittoral to 5–6 m depth, and Zeuxo coralensis from the midlittoral to 1 m depth. Leptochelia savignyi and Zeuxo coralensis are present on exposed, semi‐exposed and sheltered places, while Teleotanais sp. is absent from the last. The importance of the substrate as a factor influencing the distribution and the abundance of tanaids was again confirmed: sometimes the effect of the substrate is more significant on the animals than the wave action. The highest density of tanaids was found on the calcareous algae. Leptochelia savignyi is the most abundant species. There is some seasonal variation in the numbe...

On the tube building of some Tanaidacea

Abstract The rearing of 12 different species of Tanaidacea in aquaria is described with particular reference to the tube building. Other results obtained are briefly mentioned.