The marine fauna and flora of the Isles of Scilly. Tanaidacea (Crustacea: Peracarida)

Records of Tanaidacea from the Isles of Scilly are collated; the published literature is reviewed, together with unpublished records from various sources. These data are supplemented by recent material collected in the archipelago between 2001 and 2010. A total of 10 species are now known from littoral and sublittoral habitats of the Isles. These records include the first published record for the British Isles of the tanaid Zeuxo holdichi, the known distribution of which is summarized. The apseudomorph Apseudopsis latreilli is common to abundant on littoral sandflats but Apseudes talpa generally replaces this species on more heterogeneous substrata and sublittorally. Tanais dulongii and Leptochelia savignyi are present throughout the archipelago among littoral algal-turf with embedded sediment. Zoogeographically, the list includes species from the temperate–boreal and, mainly, from Lusitanian waters.     

Deep-sea Tanaidacea (Crustacea) of the North-east Atlantic: the tribe Agathotanaini

The tanaidacean tribe Agathotanaini, which was formerly the family Agathotanaidae, is well-represented in the Rockall Trough and Bay of Biscay areas of the North-east Atlantic. Five species have been recorded from depths of 1160–4829 m. Agathotanais ingolfi is the most numerous and one of the most widely distributed tanaidacean species in the region, and is often predominant in epibenthic sled samples from 1500–2500 m. Less numerous and frequent are three new species of Paragathotanais: P. nanus, P. robustus and P. gracilis. The first two are bathyal in distribution, and the last is abyssal. A new monospecific genus is established for Metagathotanais insulcatus, which has been recorded from the deepest part of the study region (4600–4800 m). Males of this tribe are characterized by their rigid pleopods bearing short terminal setae, and are otherwise very similar to the females. A key is provided for the identification of agathotanaids from the North-east Atlantic, including Agathotanais hanseni, and the genera Allodaposia and Paranarthrura, which should also be classified in the Agathotanaini.     

Three new species of the deep-sea genus Neotanais Beddard (Crustacea: Peracarida)

Three new species of the deep-water family Neotanaididae Lang are described. Neotanais minimus n. sp. and N. curvimanus n. sp. were collected from the Gulf of Mexico and are the first species to be described from this region. Neotanais minimus cannot be grouped with other Neotanais species, since it displays characters from all groupings. Neotanais curvimanus has strong affinities to the ‘americanus’ group but can be separated by the short pereonite 6 and by the presence of many setulose setae lateral on the pleonites. Male N. curvimanus can easily be separated from all other species of the genus by the cheliped fixed finger being only half as long as the dactylus and the dactylus being incurved from fixed finger at an angle of about 40°. Neotanais noelietaiti n. sp. was found off south-east Australia and is the first Neotanais species to be described from Australian waters. It also has strong affinities to the ‘americanus’ group but can be distinguished by the complete lack of a midventral keel and by the uropodal exopod being as long as the endopod article 1.     

A new species of Zeuxo (Crustacea: Tanaidacea) from the French Atlantic coast

A new species of tanaidacean of the genus Zeuxo is described from 105 specimens dredged from the shallow inshore benthic marine fauna from Arcachon, western France. This is the only species of Zeuxo in the Lusitanian area. Its combination of a 7-articled uropod (6-articled endopod with elongate articles in the adult) with a conspicuous lacinia mobilis on the right mandible is unique for the genus. The spination and setation of the carpus of pereopod 2 is reduced in comparison with the most similar known species of Zeuxo. It is distinct from potentially sympatric species of the family Tanaidae in having five free pleonites without a dorsal fringe of setae.     

Review of the genus Chauliopleona Dojiri and Sieg, 1997 (Crustacea,Peracarida, Tanaidacea) and description of three new species

The tanaidacean genus Chauliopleona Dojiri and Sieg, is reviewed. A generic diagnosis is given and the type species Chauliopleona dentata Dojiri and Sieg, is redescribed. Three species, Leptognathia armataHansen, , L. amdrupii Hansen, and L. hastata Hansen, are placed into this genus. Three new species, one from the Angola Basin, one from the deep sea of the tropical East Pacific and one from Antarctica are described. A key for the genus is provided.     

Revision of the genus Peraeospinosus Sieg, 1986 (Crustacea: Peracarida: Tanaidacea)

Ten species, four new to science, five formerly belonging to genus Typhlotanais, and Peraeospinosus pushkini (Tzareva, 1982 Tzareva, L. A. 1982. “Dopolnenie k faune kleshnienosnykh oslikov (Crustacea: Tanaidacea) shelfovykh zon Antarktiki i Subantarktiki.”. In Fauna i raspredelenie rakoobraznych notal'nych i antarkticheskikh vod, Edited by: Kavanov, A. I. 119Vladivostok: Akademia Nauk SSSR.  [Google Scholar]) are congeneric species, based on the following set of characters: a row of setae is present on the dorsal margin of the cheliped carpus, the distal seta of pereopods 4–5 exceeds the bifurcated unguis, large prickly tubercles on pereopods 4–6 surrounded by well‐calcified spines, the pleopods semi‐elliptical, and the rami of the uropod subequal in length. The new definition of the genus is proposed together with a key for identification of the females. The present‐day distribution of the genus does not in itself indicate geographical origin, although the possibility of a deep‐water origin cannot be excluded. It is assumed that phylogenetically young, blind Peraeospinosus could have colonized Antarctic free niches and then radiated.     

Revision of the tanaidomorphan deep-sea genus Tanaella (Crustacea: Tanaidacea)

The genus Tanaella is revised and the generic diagnosis redefined. Both genders of the type species, Tanaella unguicillata and T. ochracea are redescribed. Two new species, T. prolixcauda and T. mclellandi, are described from deep-sea localities in the Gulf of Mexico. Male Tanaella possess fully functional mouthparts resembling, but not identical to, those of the females. Distribution and ecological information are given for all species in the genus and a key to Tanaella is also given.     

Deep-sea tanaidaceans (Crustacea: Peracarida) from the Albatross cruises 1885-86 with keys to the suborder Neotanaidomorpha

Previously unidentified tanaidacean material from the US Albatross cruises 1885–86 revealed a number of new species. Most species belonged to the suborder of Neotanaidomorpha, of which two new species were found. Neotanais gardineri n. sp. is described. The species N.insolitus is transferred to the genus Venusticrus. Additional information of previously described species of Neotanais is given. The existence of a cheliped ischium within the Neotanaidae is noted. A species list for the new material from the Albatross Expedition is given as well as complete keys to the females of the suborder Neotanaidomorpha. Species of the suborder Tanaidomorpha were also found. The new species Collettea wilsoni is described (Family indet). Also found were two undesribed species of Anarthruridae (Anarthrurinae), as well as a large number of Agathotanais ingolfi.     

Another inordinate fondness†: diversity of the tanaidacean fauna of Australia,with description of three new taxa

The shallow-water tanaidacean fauna of the Bass Strait has been the subject of recent intensive studies. The present paper extends this work into the deeper waters of the region, describing two new species and one new genus. The new species of the genus Paradoxapseudes has a combination of three maxillule palp setae, no plumose setae on the basis of pereopod 1 nor proximal serration on the antennal peduncle. The second species represents a new genus of the family Anarthruridae, having six marginal setae on the third maxilliped palp article and spines on the merus and carpus of the anterior pereopods. The high diversity of Tanaidacea in Australian waters is discussed. In particular, we conclude that Australian coasts suffer a diversity of immigration routes, have sufficient marine longevity, and afford such a diversity of available niches to have allowed multiple colonization and subsequent allopatric speciation of Tanaidacea. http://www.zoobank.org/urn:lsid:zoobank.org:pub:EE309A5A-E06D-416F-95BD-4C8D0D2BEB97     

The Tanaidacea (Crustacea,Peracarida) of the North-East Atlantic: the shelf and bathyal Paratyphlotanais of the ‘Atlantic Margin’

Increasing oil-exploration activity and associated ecological surveying west of the Shetlands is leading to the discovery of many poorly known or undescribed tanaidaceans. Three species of the typhlotanaid genus Paratyphlotanais Kudinova-Pasternak and Pasternak, 1978 Kudinova-Pasternak R. K Pasternak F. A 1978 Deep sea Tanaidacea collected from the Caribbean Sea and Puerto Rico trench during the 16th cruise of RV ‘Akademik Kurchatov’ and the resemblance between the fauna of deep-sea Tanaidacea of the Caribbean region and the Pacific Trudy Instituta Okeanologiii. Akademiya Nauk SSSR, 113, 115–135 (in Russian)  [Google Scholar] have been recorded from shelf and bathyal depths between Iceland, the Faroe Islands and the western margin of the British Isles. Two, P. gracilipes (Hansen) and P. microcheles (G. O. Sars), formerly belonging to the genus Typhlotanais, are redescribed and a new species is described. A key to their identification is included. Inhabiting largely discrete zoogeographic areas, these species help define regional macrofaunal associations.     

Microdajus (Crustacea: Tantulocarida) parasitic on an Antarctic tanaidacean,and a range extension of M. langi Greve

Ectoparasitic tantulocaridan crustaceans, Microdajus aporosus sp. nov., were found attached to the tanaidacean crustacean Meromonakantha macrocephala (Hansen) from 568 m in the Ross Sea. A single host bore on its pereiopods five expanded tantulus larvae with gestating males and two isolated cephalons of the parasite. Microdajus langi Greve is newly reported from the Gullmarfjord, Sweden. A recent comparison of tantulocaridan thoracopods to maxillopodan naupliar appendages is evaluated in the light of recent morphological and ontogenetic findings.     

Description and female genital structures of a new species of the demersal calanoid copepod Ridgewayia from southern Japan

A new species of the demersal calanoid copepod Ridgewayia, R. boxshalli n.sp., is described from southern Japan. This is the first record of the genus in Japan. It is distinguishable from other congeners by the antennule and leg 5 of both sexes. In order to identify evolutionary trends, detailed observations were also carried out on the female genital structures using light and scanning electron microscopy for comparison with other calanoids. Their organization is characterized by two egg-laying ducts opening through paired gonopores into a small cavity, the genital atrium, covered by a genital operculum and opening to the outside through a distal atrial slit. No seminal receptacle is present. The unique morphological features and in situ feeding habit of Ridgewayia are also noted.     

Intraspecific clinal variation in Plagiodontes patagonicus (Gastropoda: Orthalicidae,Odontostominae), an endemic species from Argentina

Plagiodontes patagonicus (d'Orbigny, 1835) is a quite variable species endemic to southern Buenos Aires province (Argentina). Its taxonomic characterization did not include any quantitative analysis of variability for an accurate discrimination, and the extremes of its variation were described as different subspecies or species. In this paper, shell measurements and angles, and quantitative data on the terminal male genitalia were studied by Principal Component Analysis and Varimax multivariate analysis. Typical Plagiodontes patagonicus and the largest form known as P. patagonicus magnus Hylton‐Scott, 1951 Hylton‐Scott, MI. 1951. Nuevos moluscos terrestres del norte argentino.. Acta Zoologica Lilloana, 10: 5–29.  [Google Scholar] showed an almost continuous pattern of shell variation, which is positively correlated with the altitude gradient over their geographical range, which in turn is correlated with a rainfall gradient, i.e. they constitute a size‐form cline that does not allow objective delimitation of different morphospecies. Data from the genital system were also arranged as a geographical gradient within the P. patagonicus patagonicus–P. patagonicus magnus continuum. The variability of protoconch sculpture and apertural teeth also indicate recognition of them as a single taxon.     

Tanaidacea (Crustacea: Peracarida) of the North-east Atlantic: the genera Leptognathioides and Portaratrum of the ‘Atlantic Margin’

The tanaidomorphan genera Leptognathioides and Portaratrum from the Benthic Invertebrates of Icelandic waters (BIOICE), Marine Benthic Fauna of the Faroe Islands (BIOFAR), and Atlantic Frontier Environmental Network (AFEN)-related surveys are examined. The diagnosis for Leptognathioides polita is amended and additional size data are given. A new species, L. biarticulata, is described although the differences from L. polita are slight. It occurs in the bathyal Iceland Basin with a distribution that does not overlap with that of L. polita. A new species of Portaratrum, P. holdichi, is described and the apparent similarities (parallelisms) between this former colletteid genus and the akanthophoreid Chauliopleona are discussed. The distribution and rarity of both genera in the region are analysed, Leptognathioides being more common in the cold-water areas or along the cold–warm interface. Portaratrum holdichi n. sp. is more common and abundant in the Rockall-Biscay region of the NE Atlantic.

http://www.zoobank.org/urn:lsid:zoobank.org:pub:81262671-0665-49C3-9A02-F243C60FC334     

A new species of Plagiodontes from Argentina,and new data on the anatomy of four other species in the genus (Gastropoda: Orthalicidae,Odontostominae)

Abstract

Plagiodontes weyrauchi sp. nov. is among the smallest species in the genus Plagiodontes (Doering, 1877). Statistical multivariate analyses confirmed its distinctiveness from other species, mostly because of its high number of whorls (8–9.75), relatively small width, and low proportions of last whorl and aperture length to shell length; multivariate discriminant analysis applied to this species and its most similar relative, P. multiplicatus parvus, correctly identified 100%?of specimens. Pallial and genital anatomy supports P. weyrauchi as a different species, mainly because of the position of the ureteric pore, the small general size of the genital system, the presence of an accessory lobe alongside the verge, and the vaginal internal structure. Internal anatomy of four other small-sized taxa in the genus was studied. Two of them have a verge with no accessory lobe [P. dentatus (Wood, 1828) and P. patagonicus (d'Orbigny, 1835)], while the remaining two have an accessory lobe with different characteristics [P. rocae Doering, 1881 and P. multiplicatus parvus (Hylton-Scott, 1952 Hylton-Scott, M I. 1952. Nuevos moluscos terrestres del norte argentino. Acta Zool Lilloana., 10: 5–29.  [Google Scholar])]. Internal structure of the vagina also shows specific differences among Plagiodontes species; their phylogenetic significance will be further investigated.     

The braconid parasitoids (Hymenoptera: Braconidae) associated with seeds of Dipterocarpaceae in Malaysia

Nineteen species of Braconidae have been reared from seeds of Dipterocarpaceae (mainly Shorea species) in West Malaysia. Eleven new species (Brachistinae: Schizoprymnus mesocaudus sp. nov.; Schizoprymnus torreadoroides sp. nov.; Braconinae: Bracon nitidisoma sp. nov.; Bracon rugulifer sp. nov.; Syntomernus shoreatus sp. nov.; Spermatobracon triangulornatus sp. nov.; Cheloninae: Ascogaster cornifera sp. nov.; Ascogaster lamellifera sp. nov.; Phanerotoma divergens sp. nov.; Microgastrinae: Apanteles hemiaurantius sp. nov.; Apanteles striatus sp. nov.) and one new genus (Spermatobracon gen. nov.; type species: Spermatobracon triangulornatus gen. nov. and sp. nov.) are described and illustrated.     

Biodiversity of subterranean amphipod crustaceans: global patterns and zoogeographic implications

Gammaridean amphipod crustaceans are important components of subterranean groundwater communities in many parts of the world. Most subterranean species are stygobionts, which are defined by loss or reduction of eyes and pigment and restriction to hypogean waters. The global subterranean amphipod fauna is composed of about 740 species that are distributed among 36 families and 138 genera; however, 12 families contain about 94% of all hypogean amphipods recorded to date. With respect to number of stygobionts, the four most important families are the Niphargidae, Crangonyctidae, Hadziidae s. lat. (complex), and Bogidiellidae. Many regions of the world contain significant diversities of subterranean amphipods, but the central and southern European-Mediterranean and eastern and southern North American-West Indian regions are clearly superior in taxonomic diversity and species richness. Together these two regions contain about 77% of the world's subterranean amphipod fauna, and their high diversities are attributed in part to geographical heterogeneity and a unique combination of geological and ecological phenomena that include extensive karst terrains, absence of glaciation, and exposure to marine transgressions in the south. Other regions with significant diversities of subterranean amphipods include southern Africa, Australia-New Zealand, eastern Asia, central South America, central Asia, northeastern Africa, and islands of the Atlantic, Pacific, and Indian Oceans. The subterranean fauna of southeastern Asia remains very poorly known to date.     

Gall-inducing jumping plant-lice of the Neotropical genus Baccharopelma (Hemiptera,Psylloidea) associated with Baccharis (Asteraceae)

The genus Baccharopelma (new replacement name for Neopelma Burckhardt, 1987 Burckhardt, D. 1987. Jumping plant lice (Hoomoptera: Psylloidea) of the temperate neotropical region. Part 1: Psyllidae (subfamilies Aphalarinae, Rhinocolinae and Aphalaroidinae). Zoological Journal of the Linnaean Society, 89: 299–392. [Crossref], [Web of Science ®] , [Google Scholar] nec Sclater, 1860 Sclater, P. L. 1860. Characters of ten new species of American bird. Proceedings of the Zoological Society of London, 28: 461–467.  [Google Scholar]; and for its replacement name Burckhardtia Straube and Miretzki, 1999 Straube, F. C and Miretzki, M. 1999. A homonymy in Psyllidae (Homoptera): a new name for Neopelma Burckhardt. Revista brasileira de Zoologia, 16: 1233 [Google Scholar] nec Frech, 1907 Frech F 1907 Ueber Aviculiden von palaeozoischem Habitus aus der Trias von Zacatecas Comptes Rendus du Congrès Géologique International, Mexico, 10(1906), 327–335  [Google Scholar] nec Brown and Hodkinson, 1988 Brown, R. G and Hodkinson, I. D. 1988. Taxonomy and ecology of the jumping plant-lice of Panama (Homoptera: Psylloidea). Entomonograph, 9: 304?pp [Google Scholar]) is revised to include five named species and possibly two undescribed species. The junior homonym Burckhardtia Brown and Hodkinson nec Frech is replaced by Hodkinsonia nom. n. The introduction of the two generic replacement names necessitates two new combinations. Four species are described as new. Keys for the identification of adults and the last instar larva are provided along with species diagnoses and illustrations of taxonomically relevant structures. The galls and known biological features are briefly discussed for each species and the phylogenetic relationships among the species are analysed. Baccharopelma spp. are monophagous on Baccharis spp. (Asteraceae) on which they induce galls. The temperate South American genus has one species restricted to Chile, three to Brazil and one occurring in Argentina, Brazil and Paraguay.