1,721,154 research outputs found
FIGURE 89. Jassaalonsoae Conlan, 1990. Adult male, 10.0 in Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus
No full textFIGURE 89. Jassaalonsoae Conlan, 1990. Adult male, 10.0 mm. Puerto Deseado, Santa Cruz, Argentina, 26 October, 1981, G.M. Alonso, coll., A2020.0028 (CMN). Lateral view: gnathopod 2; other views medial. Scale 0.1 mm.Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 140, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
FIGURE 94. Jassa thurstoni Conlan, 1990. Adult male 1 in Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus
No full textFIGURE 94. Jassa thurstoni Conlan, 1990. Adult male 1, major form, paratype, 6.0 mm, NMCC-1082. Observation Bluff, Outer Islet, Signy Island, South Orkney Islands (60°42ʹ30ʺS, 45°35ʹ10ʺW), 14 September 1965, M. H. Thurston, coll., station 52 (2085), Agassiz trawl over gravel and sand, sand with some rock, algae on rocks, 20 m depth, NHM 1969:763:1. IZ 1989-013 (CMN). Mouthparts. Frontal view: upper lip; lateral view: maxilla 1; other views medial. Scale 0.1 mm.Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 146, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
Jassa californicus
No full textJassa californicus (Boeck, 1871) The Norwegian scientist Axel Boeck (1871) described seven new species from a collection made in the San Francisco area of California and sent to him for taxonomic assessment and deposition in Norway by a Professor Esmark. One of these was Podocerus californicus, based on two female specimens. Stebbing (1906) recognized this species as Jassa californica. Conlan (1990) noted that the whereabouts of the type specimens was unknown. As a further effort to locate these specimens, The Natural History Museum, Oslo, Norway, which is the repository for Boeck’s collection, was contacted but the reply was, “...we have not any Podocerus californicus Boeck, 1871 in our collection, and Idon’t know where you can find it — if it exists...” (Åse Ingvild Wilhelmsen, 8 June 2018). It is possible that these specimens could have been any of the species indigenous to the California coast but named much later: J. slatteryi (Figs 3–4), J. morinoi (Figs 5–6), J. borowskyae, J. staudei, J. carltoni, J. shawi or J. myersi (Fig. 10). It is possible also that it could have been J. marmorata which would place its introduction to this area much earlier than is currently known.Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 160, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
Jassa variegatus
No full textJassa variegatus (Leach, 1814) Stebbing (1899a) compared Leach’s (1814) descriptions of the genera Podocerus and Jassa, collected from Devon, England, demonstrating that the two genera were valid, while previously, it had been thought that the two were the same. This study initiated the transfer of species to each genus, with Podocerus variegatus Leach, 1814 being the type for the genus Podocerus. Conlan (1990) examined the syntypes NHM 295b and 285d of Podocerus variegatus and found them to be indeed in the genus Podocerus. Jassa pulchella Leach, 1814 erected by Leach as the type for the genus Jassa (NHM 296a–g; lectotype: 296e), is now J. falcata (Montagu, 1808) (holotype: NHM 603a). Asecond species of Jassa described by Leach (1814), J. pelagica, was transferred by Stebbing (1899a) to Parajassa. Stebbing (1899a) documented the taxonomic confusion surrounding these three species over the 85 years between Leach’s publication and his own. Conlan (1990) mis-interpreted Stebbing (1899a) in thinking that there werestill specimens of Leach’s type series for P. variegatus that contained Jassa. However, this appears to be not the case, since P. variegatus and P. pelagica had their types validated by Conlan (1990) along with the type species for the genera Podocerus and Jassa. Therefore, the name J. variegatus is invalid (it is actually P. variegatus).Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 161, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
Jassa calcaratus
No full textJassa calcaratus (Rathke, 1843) In documenting the fauna of Norway, Rathke (1843) described and figured a new species which he had collected from seaweed at Kristiansund, Norway. Named Podocerus calcaratus, his illustration of the male’s long-thumbed gnathopod 2 indicates that it is probably Jassa falcata. Rathke (1843) indicated that P. calcaratus was close to, but different from P. pulchellus (now Jassa falcata) but did not state why. Bate (1862) disagreed and synonymized P. calcaratus under P. pulchellus (now Jassa falcata). Sars (1894) listed P. calcaratus as a synonym of P. falcatus (now Jassa falcata), saying that “The P. calcaratus of Rathke is undoubtedly the adult male of this species...” One large male specimen, collected at Tromsø, Norway, and identified as Podocerus calcaratus by Danielsen, (not type), was lent by the Zoological Museum, Bergen, Norway (ZMUB 2832) for this study. The vial held a secondary label, Jassa pulchella. This specimen was clearly a major form male J. falcata. Although the whereabouts of the type specimens are unknown, it is clear from Rathke’s (1843) description, illustrations and collection location that his P. calcaratus is indeed J. falcata (Montagu, 1808). Therefore, J. calcaratus is synonymized with J. falcata.Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 160, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
FIGURE 45 in Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus
No full textFIGURE 45. Jassa falcata (Montagu, 1808). Variation in thumb length relative to body length in males in a single collection at Audrassalas, Pas-de-Calais, France, 1 July 1985, K. E. Conlan, coll., in tubes and and actively walking over Ceramium rubrum (mainly) and Polysiphonia, even though out of contact with seawater at low tide, IZ 1985-093 (CMN). Arrows refer to the associated gnathopod illustrations. The subadult male had a thumb visible inside the cuticle, indicating that it would molt next into a thumbed adult. Setae omitted except for those around the thumb and spines in order to landmark position changes with growth. All views lateral. Scale 0.1 mm. Linear regression assumptions passed for the adult major form male. Linear regression statistics: Major form, thumb length = -1.219 + 0.281 body length, r2 = 0.773, n = 38. Illustration after Conlan (1990).Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 84, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
Master track of HEINCKE cruise HE581 in 1 sec resolution (zipped, 6.8 MB)
No full textRaw data acquired by position sensors on board RV Heincke during expedition HE581 were processed to receive a validated master track which can be used as reference of further expedition data. During HE581 the inertial navigation system IXSEA PHINS III and the GPS receivers Trimble Marine SPS461 and SAAB R5 SUPREME NAV were used as navigation sensors. Data were downloaded from DAVIS SHIP data base (https://dship.awi.de) with a resolution of 1 sec. Processing and evaluation of the data is outlined in the data processing report found at EPIC repository https://hdl.handle.net/10013/epic.c576cad6-0344-4ff0-a7bb-da789260c7c5. Processed data are provided as a master track with 1 sec resolution derived from the position sensors' data selected by priority and a generalized track with a reduced set of the most significant positions of the master track
Master track of HEINCKE cruise HE562 in 1 sec resolution (zipped, 8.0 MB)
No full textRaw data acquired by position sensors on board RV Heincke during expedition HE562 were processed to receive a validated master track which can be used as reference of further expedition data. Position sensors used during HE562 were the internal navigation system IXSEA PHINS III and the GPS receivers Trimble Marine SPS461 and SAAB R5 SUPREME NAV. Data were downloaded from DAVIS SHIP data base (https://dship.awi.de) with a resolution of 1 sec. Processing and evaluation of the data is outlined in the data processing report found at EPIC repository hdl:10013/epic.7fb76fae-9928-4d69-aea6-a12856504ca7. Processed data are provided as a master track with 1 sec resolution derived from the position sensors' data selected by priority and a generalized track with a reduced set of the most significant positions of the master track
Jassa spinipes
No full textJassa spinipes (Johnston, 1829) Named Gammarus spinipes by Johnston (1829), this British species was “...found among Sertulariae taken from a fishing boat, so that it probably inhabits deep water.ʺNo further locality information was given. Johnston described the second gnathopod: “...the palm much dilated, armed with a single claw, and beneath with a conical spine, much like a claw. Between these there is a triangular process.” In his remarks, Johnston stated that “I cannot refer it to any described species. It surely cannot be the Jassa pulchella of Dr. Leach.” This is because, “...in Jassa pulchella the inferior antennae are the longest, and are said to be leg-shaped, a form which those of Gamm. spinipes have not, if Ihave a correct idea of what is meant by that term.” Johnston (1829) provided no illustrations for his new species description and the whereabouts of his type is unknown. This comparison of G. spinipes to J. pulchella is perhaps the reason why it appears in WoRMS as J. spinipes. In their comprehensive publications on the British Amphipoda, Bate (1862) and Bate & Westwood (1863, 1868) did not mention a species named spinipes, either of the genera Gammarus, Podocerus or Jassa. Stebbing (1906) mentioned G. spinipes in his addendum, only giving the reference for Johnston (1829). Lincoln (1979) did not mention either G. spinipes or J. spinipes in his updated treatment of the British Amphipoda. The reason for the transfer of G. spinipes to Jassa is not given in WoRMS and appears to be unjustified, given Johnston’s short description and lack of a type.Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 161, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062
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