Cumacea species (Crustacea: Peracarida) from the deep-sea expedition DIVA-1 with RV “Meteor” to the Angola Basin in July 2000. Family Nannastacidae

AbstractSeven new deep-sea species of the family Nannastacidae from the Angola Basin were observed. In total three species, one in open nomenclature, of the genus Campylaspis Sars, 1865, and one Cumella Sars, 1865, two Styloptocuma Bacescu and Muradian, 1974, and one Platycuma Calman, 1905, are described

Sobre la biogeografía de Cumacea - una comparación entre América del Sur, las islas subantárticas y la Antártida: estado de la cuestión

Cumacea (Crustacea) were collected during the Joint Magellan expedition in November 1994, by means of an epibenthic sledge from RV Victor Hensen. The cumaceans were well represented, the second abundant order after the amphipods, among the other Peracarida in depth ranges between 25 and 665 m. Twenty-five species were found in the samples mainly from the Beagle Channel, nine of them were already known for this region. 14 species were recorded for the first time for this region, 2 of them were known from the northern Argentinian coast and one from Antarctica. The most important in terms of species richness and abundance were the families Diastylidae, Nannastacidae and Leuconidae. In the Beagle Channel an almost completely different cumacean fauna was found compared to the Subantarctic Islands, the Antarctic Peninsula and eastern Antarctic (Prydz Bay) regions. Comparison of published data and the present results show moderate overlap in the cumacean fauna at the species level between the periantarctic South Georgian shelf / Antarctic Peninsula (48%). Little correspondence at the species level was found between Antarctica / Subantarctic Kerguelen (14 %), South Georgia / Kerguelen (13 %) and Magellan / Antarctica (11 %). Interestingly, the Magellan region and South Georgia show very little species overlap (5 %). It is concluded that the Antarctic shelf regions were not colonized from the Magellan region via the Scotia Arc.Durante la campaña “Joint Magellan” con el B/I “Victor Hensen” en noviembre de 1994 se capturaron Cumacea (Crustacea) con una draga epibentónica. Los cumáceos estuvieron bien representados, después de los anfípodos fueron los más abundantes entre los otros Peracarida en ámbitos de profundidades entre 25 y 665 m. Se encontraron veintitrés especies en las muestras obtenidas en el Canal del Beagle, nueve de las cuales eran ya conocidas para la región. Se han registrado catorce especies por primera vez para esta región, cuatro de ellas se habían citado en la costa norte de Argentina. Las familias Diastylidae, Nannastacidae y Leuconidae fueron las más importantes con respecto a diversidad de especies y abundancia. En el Canal del Beagle se encontró una fauna de cumáceos casi completamente diferente comparada con la de las islas subantárticas, de la Península Antártica y de las regiones en el este de la Antártida (Prydz Bay). Comparaciones de los presentes resultados con datos publicados muestran una sobreposición moderada de la fauna de cumáceos a nivel de especies entre la plataforma periantártica de Georgia del Sur y la Península Antártica (48%). Se encontraron pocas coincidencias entre la Antártida y las Kerguelen subantárticas (15%), entre Georgia del Sur y las Kerguelen (13%) y entre la región de Magallanes y la Antártida (11%). Es interesante destacar que la región de Magallanes y Georgia del Sur casi no tienen especies en común (5%). Se concluye que las regiones de la plataforma antártica no fueron colonizadas desde la región de Magallanes vía el Arco de Escocia

Two new Diastylis (Cumacea: Diastylidae) from Antarctic waters: Diastylis andeepae and D. catalinae

Two new deep-sea cumaceans, Diastylis andeepae and D. catalinae are described from the Weddell Sea. Diastylis andeepae n. sp. can be distinguished from other members of the genus by a combination of characters including: carapace with small tubercles all over and anterior part with an arched row of teeth extending from each side of the pseudorostrum and disappearing a short distance before reaching the inferior margin of the carapace, ischium of the pereopod 2 with four strong teeth, endopod uropod of two articles. Diastylis catalinae n. sp. is a closely related species to D. richardi Fage 1929 recorded from the Bay of Biscay, however D. catalinae can be easily separated from D. richardi by having: (1) on each side of the anterior part of the carapace several teeth arranged in two non-uniform rows (randomly distributed and with two antero−lateral horns in D. richardi); (2) clearly visible pereonites 1 and 2 in dorsal view (hardly visible in D. richardi); (3) one tooth on each postero−lateral angle of the pereonite 5 (without teeth in D.richardi); and (4) one minute simple seta on article 4 of the antenna 2 (a long setulate seta in D. richardi).Fil: Alberico, Natalia Andrea. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mühlenhardt Siegel, Ute. Biozentrum Grindel ; Alemani

La biogeografía de Crustacea y Mollusca de las regiones Subantártica y Antártica

The Joint Magellan Victor Hensen Campaign in 1994 focused on the biogeographic relationships of the Antarctic and Magellan fauna. The Peracarida and Mollusca sampled at 18 stations in the Beagle Channel by means of an epibenthic sledge were compared with the knowledge about the distribution of species data from the Falkland Islands, South Georgia, Antarctica and the Kerguelen. Peracarida were an important fraction of the macrobenthos and sampled in high numbers. About 105,000 individuals were collected with the epibenthic sledge. Until now about 40 species of Amphipoda, about 42 species of Isopoda, 24 species of Cumacea, eight species of Mysidacea, and 16 species of Tanaidacea were found. 118 mollusc taxa were identified, nine species of Aplacophora, 52 of Gastropoda, five of Scaphopoda and 52 of Bivalvia. Although the species present different distribution trends, the zoogeographic comparison for six larger taxa (four Mollusca and two Peracarida) showed that the species similarities decreased from the Magellan region towards the Falkland Islands and from South Georgia to Antarctica. The Magellanic Gastropoda showed similarities with the fauna of the Falkland Islands and South Georgia (31-37 %), whereas the Bivalvia were more similar to the Antarctic fauna (29 %). With regard to Crustacea, 10% of Antarctic Isopoda species were also found in the Magellan region; the Weddell Sea and East Antarctica, and South Georgia and the Antarctic Peninsula shared most species of both Cumacea and Isopoda, whereas the lowest similarities were shown between Bellingshausen and Weddell Sea for the Isopoda, and interestingly between the Magellan region and South Georgia for the Cumacea. The highest degree of endemism of the Isopoda and Cumacea was found in the Magellan region, where as a consequence of the opening of the Drake Passage many new species seem to have evolved in these taxa.La campaña multidisciplinar realizada en el año 1994 a bordo del “Victor Hensen”, se enfocó al estudio de las relaciones biogeográficas entre la fauna de la zona magallánica y la Antártida. Se compararon los datos obtenidos a partir del muestreo de peracáridos y moluscos llevado a cabo en 18 estaciones en el Canal del Beagle mediante un patín epibentónico, con los datos existentes sobre la distribución en las Islas Malvinas, Georgia del Sur, Kerguelen y la Antártida. Los peracáridos representaron una fracción importante del macrobentos y se muestrearon en grandes cantidades. Se colectaron alrededor de 105.000 especímenes con el patín epibentónico. Hasta ahora se han encontrado alrededor de 40 especies de anfípodos, cerca de 42 especies de isópodos, 24 especies de cumáceos, 8 especies de misidáceos y 16 especies de tanaidáceos. Se identificaron 118 taxones de moluscos, 9 especies de aplacóforos, 52 especies de gastrópodos, 5 especies de escafópodos y 52 especies de bivalvos. Aunque las especies presentaron patrones de distribución muy diferentes, la comparación zoogeográfica realizada con 6 taxones (4 moluscos y 2 peracáridos) muestra, en el caso de moluscos, que la similaridad entre especies disminuye desde la región magallánica hasta las Islas Malvinas y desde Georgia del Sur hasta la Antártida. Los gasterópodos magallánicos muestran similaridad con la fauna de las Islas Malvinas y Georgia del Sur (31-37 %), mientras que los bivalvos fueron más similares a los pertenecientes a la fauna antártica (29 %). En relación a Crustacea, 10 % de las especies de isópodos antárticos fueron también encontrados en la región magallánica. El Mar de Weddell, la Antártida oriental, Georgia del Sur y la Península Antártica compartieron la mayoría de las especies de cumáceos e isópodos; similitudes más bajas se mostraron entre los isópodos de Bellinghausen y el Mar de Weddell, e interesantemente para los cumáceos entre la región magallánica y Georgia del Sur. El alto grado de endemismo de los isópodos y cumáceos de la región magallánica señalaría a este taxón como un foco de radiación con especies que evolucionaron in situ despues de la apertura del Paso de Drake

Composition and distribution of the peracarid crustacean fauna along a latitudinal transect off Victoria Land (Ross Sea, Antarctica) with special emphasis on the Cumacea

The following study was the first to describe composition and structure of the peracarid fauna systematically along a latitudinal transect off Victoria Land (Ross Sea, Antarctica). During the 19th Antarctic expedition of the Italian research vessel “Italica” in February 2004, macrobenthic samples were collected by means of a Rauschert dredge with a mesh size of 500 m at depths between 85 and 515 m. The composition of peracarid crustaceans, especially Cumacea was investigated. Peracarida contributed 63% to the total abundance of the fauna. The peracarid samples were dominated by amphipods (66%), whereas cumaceans were represented with 7%. Previously, only 13 cumacean species were known, now the number of species recorded from the Ross Sea increased to 34. Thus, the cumacean fauna of the Ross Sea, which was regarded as the poorest in terms of species richness, has to be considered as equivalent to that of other high Antarctic areas. Most important cumacean families concerning abundance and species richness were Leuconidae, Nannastacidae, and Diastylidae. Cumacean diversity was lowest at the northernmost area (Cape Adare). At the area off Coulman Island, which is characterized by muddy sediment, diversity was highest. Diversity and species number were higher at the deeper stations and abundance increased with latitude. A review of the bathymetric distribution of the Cumacea from the Ross Sea reveals that most species distribute across the Antarctic continental shelf and slope. So far, only few deep-sea records justify the assumption of a shallow-water–deep-sea relationship in some species of Ross Sea Cumacea, which is discussed from an evolutionary point of view

Paravaunthompsonia Mühlenhardt-Siegel, 2008, gen. nov.

Paravaunthompsonia gen. nov. Diagnosis. Carapace with three small teeth dorsomedially on frontal lobe; ocular lobe wider than long, with lenses. Four free thoracic segments visible; pleonite 6 produced between the uropods and longer than their peduncles. Exopods on maxilliped 3 and pereiopods 1 to 4 in male. Maxilliped 3 with distal prolongations on basis and merus. Type species: Paravaunthompsonia meteorae gen. nov. sp. nov. Etymology: The new genus is named Paravaunthompsonia because of its resemblance, at first glance, to the genus Vaunthompsonia. Remarks. The new genus resembles in terms of the habitus at first glance members of the genus Vaunthompsonia, however, it has eye lenses as have the bodotriid genera Sympodomma Stebbing, 1912 and Pseudosympodomma Kurian, 1954, but not Vaunthompsonia Bate, 1958. It differs from these in having no visible first pereionite. Paravaunthompsonia, like Sympodomma, has exopods in males at the first three pereiopods, and is, like Pseudosympodomma, not laterally compressed.Published as part of Mühlenhardt-Siegel, Ute, 2008, The Cumacea of the Red Sea and Gulf of Aden, with the description of four new species and one genus, pp. 1-17 in Zootaxa 1828 on page 2, DOI: 10.5281/zenodo.18313

Makrokylindrus (Adiastylis) duplosetosus Muhlenhardt-Siegel 2005

Makrokylindrus (A.) duplosetosus Mühlenhardt-Siegel, 2005 Material. DIVA II, EBS # 64 -S: 1 damaged manca ZMH: K- 43926. Distribution. Angola and Guinea Basins, 5054 – 5415 m depth. Remarks. The present specimen from the DIVA II collection is unfortunately in very poor condition. Discernable are two pairs of anteriorly directed teeth at the pseudorostrum, the posterior one being longer. Some extremities and the uropods are broken off. The telson is still present with the postanal part about 0.25 times as long as the preanal part. There is only one pair of lateral teeth close to the terminal two teeth at the telson, whereas M. duplosetosus is known to have two pairs of short lateral teeth. It is assumed that the manca has not yet developed the second pair. The ornamentation of the maxilliped 3 articles and the antenna 1 having two long teeth at article 1 strongly indicates that the present specimen belongs to the species M. (A.) duplosetosus.Published as part of Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, pp. 301-341 in Zootaxa 3815 (3) on page 328, DOI: 10.11646/zootaxa.3815.3.1, http://zenodo.org/record/22732

Makrokylindrus (Adiastylis) paramonodi Muhlenhardt-Siegel 2005

Makrokylindrus (A.) aff. paramonodi Mühlenhardt-Siegel, 2005 e Material. DIVA II, EBS # 64 -S: 1 female (dissected) ZMH: K- 43928. Distribution. Angola and Guinea Basins, 5054 – 5390 m depth. Remarks. The specimen from the DIVA II collection is in bad condition, pereiopods 3 and 5 are broken off as well as the pleon and the distal part of pereiopod 1. However, a pair of moderately long teeth at the pseudorostrum are discernable and very few teeth at the anterior part of the carapace. The maxilliped 3 has strong teeth at the inner margin and outer distal corner of the basis; ischium, merus, and carpus also bear strong teeth. The slender pereiopod 2 has teeth distally at ischium, merus, and carpus; the merus is elongate as described for M. (A.) paramonodi. Unfortunately, the pleon is broken off in the DIVA II specimen. Therefore, the telson and the uropods cannot be compared to M. (A.) paramonodi.Published as part of Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, pp. 301-341 in Zootaxa 3815 (3) on page 332, DOI: 10.11646/zootaxa.3815.3.1, http://zenodo.org/record/22732

Makrokylindrus (Adiastylis) renatae Muhlenhardt-Siegel 2005

Makrokylindrus (Adiastylis) renatae Mühlenhardt-Siegel, 2005 Material. DIVA II, EBS # 41 -S: 1 subadult female ZMH: K- 43924; DIVA II, EBS # 89 -E: 1 female with empty brood pouch ZMH: K- 43925. Distribution. Cape, Angola, and Guinea Basins, 5054 – 5415 m depth. Remarks. The spent female has a smooth carapace and most closely resembles M. renatae and M. paradivacumatus Mühlenhardt-Siegel, 2005.The telson is shorter than the uropod peduncle and the post anal part is very short, almost missing; the antenna 1 and the pereiopod 2 are long and thin, unfortunately the pereiopods 1 are broken off. However, the pair of subterminal setae is shorter than the terminal ones as in M. renatae and not equal in length as in M. paradivacumatus.Published as part of Mühlenhardt-Siegel, Ute, 2014, Deep-sea Bodotriidae, Diastylidae and Pseudocumatidae (Cumacea, Crustacea) from the southeastern Atlantic, pp. 301-341 in Zootaxa 3815 (3) on pages 325-327, DOI: 10.11646/zootaxa.3815.3.1, http://zenodo.org/record/22732