124,007 research outputs found
Gigantactis microdontis Bertelsen, Pietsch, and Lavenberg 1981
No full textGigantactis microdontis Bertelsen, Pietsch, and Lavenberg, 1981 (Figs. 1, 2) Gigantactis sp. 2: Parin et al., 1973: 146 (19.5-mm metamorphosal stage; eastern tropical Pacific, 12° 30’ S, 87°45’ W, 0–100 m); Parin et al., 1977: 156 (107 mm SL, western tropical Pacific Ocean, 7° 57’ N, 135° 53’ E, 0–1000 m). Gigantactis microdontis Bertelsen et al., 1981: 54, figs. 56–58, 67 (original description, seven specimens, 19.5–127 mm SL, eastern Pacific); Bertelsen and Pietsch, 2002: 959, 961, fig. 3D (comparison with congeners, in key); Love et al., 2005: 62 (eastern North Pacific); Walther-Mendoza et al., 2013: 413, tabl. 1 (in list, LACM 30284, 32204, off Guadalupe Island). Material. IOM 3596, female (Fig. 1A), 110 mm SL, western tropical Pacific Ocean, 7° 57’ N, 135° 53’ E, Isaacs-Kidd midwater trawl no. 87, fished open between 0–1000 m, 3300 m wire out, 5:42–6:42 hours, R/ V Vityaz, cruise 57, station 7297, sample no. 199, 29 March 1975. Description. Illicium without lateral filaments, nearly cylindrical throughout length; escal bulb (Fig. 1B) clubshaped, without dermal spinules, pigmented only near base and on distal part of short distal prolongation; distal patch of pigment oblong in shape, tapering posteriorly towards pore of photophore; 13 unpigmented stalked filaments, arising from distal surface of bulb just inside edge of distal pigment patch in two nearly parallel, lateral series that meet anteriorly; escal filaments short, length approximately equal to diameter of bulb, spatulate and compressed distally. Dorsal-fin rays 5, anal-fin rays 5, pectoral-fin rays 16, caudal-fin rays 9, free nearly to base. Number of premaxillary teeth 20; number of dentary teeth 31. Measurements in percent of SL: illicial length 245.5, length of esca (excluding distal filaments) 6.4, caudal peduncle length 32.7, longest caudal-fin rays (second and seventh) 37.3, longest dentary and premaxillary tooth 0.7 and 0.9, respectively. Remarks. Parin et al. (1977: 156) measured SL of 107 mm for this specimen; however, we measured 110 mm from the tip of the pterygiophore of the illicium to the posteriormost margin of the hypural plate. It may reflect a different scheme of measurements.Published as part of Prokofiev, Artem M. & Pietsch, Theodore W., 2019, First Record of the Ceratioid Anglerfish Species Gigantactis microdontis (Teleostei: Lophiiformes: Gigantactinidae) in the Western Pacific Ocean, pp. 441-444 in Zootaxa 4664 (3) on pages 441-443, DOI: 10.11646/zootaxa.4664.3.11, http://zenodo.org/record/338554
Himantolophus litoceras Stewart & Pietsch, 2010, new species
No full textHimantolophus litoceras new species Figures 1, 2, 3 Holotype. NMNZ P. 042004, female, 276 mm SL (263 mm SL preserved), F/V Seamount Explorer, Station OBS 2170 / 130, South Cavalli Seamount, east of North Cape, North Island, New Zealand, 34 º12.0'–14.0'S, 175 º05.0'–07.0'E, bottom trawl, 654 m, collected by Ted Turton, MFish Scientific Observer, 7 November 2005. Diagnosis. Metamorphosed females of Himantolophus litoceras differ from those of other members of the H. cornifer -group in having a pair of simple distal escal appendages, each lacking any trace of lateral appendages or filaments. It further differs in having the following combination of character states: length of illicium 31.1 % SL (28.2 % preserved); width of escal bulb 11.9 % SL (10.5 % preserved); illicium and esca without filaments; illicium, esca, and proximal one-half of distal escal appendage covered with tiny, close-set dermal spinules; distal escal appendages darkly pigmented, tip of intact filament silvery white in freshly thawed specimen. Description. Holotype somewhat damaged by trawl, lower jaw broken, partially missing; about threequarters length of left distal escal appendage lost prior to capture, tip healed, showing no recent signs of injury; tip of intact distal escal appendage with some signs of damage, may not be complete. Distal escal appendages separated nearly from base, escal bulb with two lobes, escal pore on posterior margin of bulb, opening on a small raised protuberance. Stem of illicium darkly pigmented, escal bulb at base of distal escal appendages white; body without unpigmented patches of skin. Dorsal-fin rays 5, two anteriormost rays simple, but closely aligned (appearing as one), remaining rays bifurcated; anal-fin rays 4, bifurcated; pectoralfin rays 16, all simple and flattened; caudal-fin rays 9, upper- and lowermost ray closely aligned with adjacent ray for most of length (each appearing as one), innermost five rays bifurcated. Four dermal spines on lateral surface of each pectoral fin lobe; approximately 55 dermal spines of each side of body. Papillae of snout and chin well developed. Number of teeth in upper jaw 29 + 28, longest tooth 4.1 mm; longest tooth in lower jaw 7.8 mm. Eye diameter 9.8 mm (6.4 mm preserved); stem of illicium 86 mm (74.3 mm preserved); width of escal bulb 33 mm (27.8 mm preserved); length of intact distal escal appendage 327 mm (319 mm preserved). Additional characters as provided for H. cornifer -group by Bertelsen and Krefft (1988) and Pietsch (2009). Discussion. Himantolophus litoceras n. sp. is a member of the H. cornifer -group as defined by Bertelsen and Krefft (1988), lacking posterior escal appendages. Within the H. cornifer -group, the new species differs from the other members in lacking lateral branching along the distal escal appendage. It is most similar to H. macroceratioides Bertelsen and Krefft, 1988 (known from two specimens) in the length of the distal escal appendage and width of the escal bulb as a percentage of SL, as well as in escal pigmentation. However, the base of the illicium and most of the distal escal appendage are naked or only sparsely covered with dermal spinules in H. macroceratioides, whereas these regions are densely covered with spinules in H. litoceras. Himantolophus litoceras n. sp. is similar to H. macroceras Bertelsen and Krefft, 1988 (known from five specimens) in the diameter of the escal bulb, and length of the illicium and distal escal appendage as percentage of SL. It also shares with H. macroceras the dense covering of dermal spinules along most of the illicial stem, escal bulb, and proximal half of the distal escal appendage. However, the distal half of the distal escal appendages of H. litoceras is naked, whereas the spinules continue to the tips of the appendage in H. macroceras. Himantolophus azurlucens Beebe and Crane, 1947 is represented by two specimens, each bearing a side branch on only one branch of the distal escal appendage, but the length of these appendages is considerably shorter (23 % SL right, 32 % SL left). Himantolophus cornifer Bertelsen and Krefft, 1988 (eight specimens) has one to three distal bifurcations of the distal escal appendage, whereas that of H. litoceras n. sp. is bifurcated only at its base. Himantolophus compressus (Osório, 1912) was known from a single specimen that was subsequently destroyed by a fire at the Museu Bocage, Lisbon, in 1978. The illustration by Osório, reproduced by Maul (1961: 101, figure 4), is somewhat crude, showing no details of the esca. Maul was unable to examine the type, but relied on Osório’s account and communication with an assistant at the Museu Municipal do Funchal. He noted that there was damage to the esca, most notably to the distal escal appendage (Maul, 1961: 103). Prior to its loss, the holotype was re-examined by Bertelsen who reported that only about 5 mm of the distal escal appendage remained (Bertelsen and Krefft, 1988: 73). Bertelsen noted, however, that the distal escal appendage arose from a single point on the bulb and bifurcated some distance up, differing from that of H. litoceras, which bifurcates at its base. The distal escal appendage percentage length and presence/absence of lateral appendages was not reported by Osório (1912). Distribution. Himantolophus litoceras n. sp. is known from a single specimen taken off the northeast coast of the North Island, New Zealand, in 654 m, which is relatively shallow water (Fig. 3). Members of the H. cornifer -group have been caught over a wide depth range, from 170 to 2150 m depth, tending to form a bimodal vertical distribution between 170 m and 900 m and 1650 m and 2150 m. However, with so few specimens of the H. cornifer -group in collections, it is impossible at this time to determine if there is species specific depth stratification. The five other species in the cornifer -group are all recorded from equatorial to subtropical waters (Pietsch, 2009: 210, figs. 213, 214). The exception to date has been Himantolophus compressus, which was caught off Portugal at 38 ° 20 ' N. A recent record of H. cornifer from 29 ° 25 ' S was recovered from the stomach of a beached sperm whale (Anderson and Leslie, 2001: 8). Himantolophus litoceras n. sp is the first record of the H. cornifer -group from the South Pacific and is the southernmost record for this group. Metamorphosed females of ceratioids of most species do not appear to undertake sustained swimming. Their body shape is generally globose with weak musculature and small posteriorly set dorsal and anal fins. In situ observations of a species of Oneirodes confirmed that they are, for the most part, drifters (Luck and Pietsch, 2008). Species of the Himantolophidae have the same body pattern as Oneirodes, so the drifting mode can be expected to apply to them as well. Himantolophus litoceras n. sp was taken in the subtropical water mass, subject to the East Auckland Current, which diverges from the eastward-flowing Tasman Front. The northeast coast of the North Island is also a region that experiences a number of eddies spinning off from this current (e.g., North Cape Eddy and East Cape Eddy) before it breaks up to the south-bound East Cape Current and less-defined currents moving north and east (Carter et al., 1998). Based on this water movement and the distribution of other himantolophid anglerfishes across the New Zealand and south-eastern Australian region, this species can be expected to also occur in the Tasman Sea as well as the southwest Pacific Ocean. Etymology. From a combination of the Greek litos meaning “simple” or “plain,” and keras meaning “horn,” in reference to the lack of lateral branching or filaments on the distal escal appendages. Comments on the status of Himantolophus pseudalbinares Bertelsen and Krefft, 1988. In his paper recording Himantolophus albinares from the Lord Howe Basin, Iglésias (2005) described a single large (207 mm SL) specimen. On the basis of what he believed to be a divided tip on one of the pair of distal escal appendages, he proposed that Himantolophus pseudalbinares is a synonym of H. albinares. Re-examination of Iglésias’s specimen, two specimens of Himantolophus albinares held by the Museum of New Zealand Te Papa Tongarewa (Fig 4,5), and the second known specimen of H. pseudalbinares reported by Stewart and Pietsch (1998) (Fig. 6), revealed a number of features that challenge Iglésias’s conclusion. Both the illustration of the holotype of H. pseudalbinares (Bertelsen and Krefft, 1988: Fig. 23) and the second specimen reported by Stewart and Pietsch (1998) clearly show that the tips of both branches of the distal appendages are precisely and symmetrically divided (Fig. 6). The apparent division of the specimen figured by Iglésias is long, distinctly ragged, and well down from the tip. Comparison with a specimen of similar size and condition in the Museum of New Zealand collection (NMNZ P. 031256; 35 ° 50.9 'S, 164 ° 57.0'E) shows similar ragged tips to the DA (Fig. 4). In the case of the NMNZ specimen, this is due to the distal escal appendages becoming thin and flaccid, with indications that the esca is beginning to break down. Dissection of that specimen also revealed that the ovaries were large with extremely thin transparent walls and no sign of any eggs. Indications are that this specimen, and the specimen described by Iglésias, were probably undergoing senescence. The diagnosis of Himantolophus albinares provided by Bertelsen and Krefft (1988) and the description by Iglésias (2005) record the absence of dermal spinules on the upper escal bulb and appendages. However, the second specimen of Himantolophus pseudalbinares has small but distinct spinules along most fo the length of the distal escal appendages, extending almost onto the tips. The senior author sent late E. Bertelsen this second specimen for his evaluation and had the identification confirmed. Small differences between that specimen and the holotype (relatively longer illicium, absence of distinctive illicial filaments and spines on the illicium) were, he believed, within the range of variation observed in its nearest relative (E. Bertelsen, pers. comm. 1992). On the basis of our examinations and analysis, we agree with Iglésias that his specimen (MNHM 2003 - 00118) is Himantolophus albinares, but that the supposed division of the distal appendage on that specimen is an artefact of illicial tissue break-down rather than evidence supporting synonymy. Therefore, in full agreement with Pietsch (2009: 344), we propose that Himantolophus pseudalbinares should be retained as a valid species supported by the diagnostic characters defined by Bertelsen and Krefft (1988). Conclusion. The capture of a new species in relatively shallow water, and the extended distribution of what has up until recently been considered an Atlantic species group, raises an number of issues about ceratioid distributions within the New Zealand EEZ. Ceratioids tend to be small (<300 mm SL), soft-bodied and occur in low densities; one per 800,000 m 3 (Helfman et al., 1997: 298). Most captures in the New Zealand EEZ have been as incidental trawl by-catch whilst targeting deep-water commercial species (e.g. orange roughy Hoplostethus atlanticus and oreo dories Oreosomatidae). The use of large mesh with a 4 cm cod-end, the need to maximise commercial returns or the constraints of stratified research tows have tended to result in few ceratioid specimens being caught intact and fewer being retained. This is compounded by the mid-water depths below 1200 m being rarely sampled within the New Zealand region. Research trawling within the New Zealand EEZ by the former Ministry of Agriculture and Fisheries and NIWA (subsequent to 1995) over the 38 -year period 1961–1997 covered 5326 km 2, most of which was shallower than 1200 m depth, and sampling by other institutions (universities, museums, etc.) amounted to an additional 2 km 2 (Nelson and Gordon, 1997). This is in an EEZ of over 4 million km 2, of which 72 % lies below 1000 m depth and 51 % is below 2000 m. Metamorphosed female ceratioids tend to be most abundant below 1000 m depth (Paxton, 1990; Nelson, 2006), therefore, the faunal list of this group for the New Zealand region (e.g. Roberts et al., 2009) is probably far from complete. Gaps in collecting reflect gaps in the knowledge of the distribution of the group as a whole. Fourteen percent of the 160 ceratioid species recognised to date are known from a single specimen; 48 % from six or fewer (Pietsch, 2009). Whilst some families such as the Ceratiidae have been relatively stable in their composition, others have continued to have new species added. The majority of these have been in the Oneirodidae (e.g., Pietsch, 2004, 2007), with some in the Thaumatichthyidae and others (Pietsch, 2005). In addition, new catches of rare species have warranted expanded re-descriptions (e.g., Kharin and Pietsch, 2007) or re-evaluations (e.g., Pietsch and Kharin, 2004). Given the low sampling intensity and large volume of habitat available, together with small body size, discovery of new ceratioid species and expanded distributions of known taxa may be expected to continue in the New Zealand EEZ.Published as part of Stewart, Andrew L. & Pietsch, Theodore W., 2010, A new species of deep-sea anglerfish, genus Himantolophus (Lophiiformes: Himantolophidae) from the Western South Pacific, with comments on the validity of H. pseudalbinares, pp. 53-60 in Zootaxa 2671 on pages 54-59, DOI: 10.5281/zenodo.19913
Formas gerais do Teorema da Dominação de Pietsch
No full textIn this work we study a general version of the Pietsch Domination Theorem, due to
Pellegrino, Santos and Seoane-Sep´ulveda, that improves the unified version present in [3]
and recovers known Pietsch Domination-type theorems where the unified approach seems
not to work.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqNeste trabalho estudamos uma vers˜ao geral do Teorema da Domina¸c˜ao de Pietsch,
devido a Pellegrino, Santos e Seoane-Sep´ulveda, que melhora a vers˜ao unificada presente em
[3] e recupera conhecidos teoremas de domina¸c˜ao do tipo Pietsch onde a abordagem unificada
parece n˜ao funcionar
A label-free method to track individuals and lineages of budding cells
No full textSingle-cell microscopy data and images with manually curated annotations for "A label-free method to track individuals and lineages of budding cells" by Pietsch, Muñoz, Adjavon, Farquhar, Clark and Swain. The data come from fluorescence microscopy experiments where yeast, with fluorescence tags on Sfp1, Nhp6A, or Myo1, were grown in microfluidics devices and subject to changes in nutrients. Cells were segmented and tracked by the BABY algorithm described in the paper. Also included are manually curated image annotations used to train and benchmark both segmentation and tracking performance of the BABY algorithm. Source code for the algorithm is available at https://git.ecdf.ed.ac.uk/swain-lab/baby.All files in this dataset are documented in the attached README.txt file
Oneirodes basili Pietsch 1974
No full textOneirodes basili Pietsch, 1974. Ladlepole Dreamer. To 15.9 cm (6.3 in) SL. Southern California (33°06’N, 118°22’W) to Isla Guadalupe, central Baja California. Described from three individuals. Probably mesopelagic and bathypelagic, but not enough data to be certain; depth: taken in nets fished to maximum depths of 700– 1,400 m (2,296 –4,593 ft). All in Pietsch (1974).Published as part of Love, Milton S., Bizzarro, Joseph J., Cornthwaite, Maria, Frable, Benjamin W. & Maslenikov, Katherine P., 2021, Checklist of marine and estuarine fishes from the Alaska-Yukon Border, Beaufort Sea, to Cabo San Lucas, Mexico, pp. 1-285 in Zootaxa 5053 (1) on page 89, DOI: 10.11646/zootaxa.5053.1.1, http://zenodo.org/record/557800
N-Benzyltetrahydropyrido-anellated thiophene derivatives: new anticholinesterases.
No full textM. Pietsch, M. Nieger and M. Gütscho
On a Question of Pietsch about Hilbert–Schmidt Multilinear Mappings
No full textAbstractIn 1983, Pietsch asked if, for n≥3 and all Hilbert spaces E1,…,En, the vector space of the scalar valued absolutely (r;r1,…,rn)-summing multilinear mappings on E1×···×En coincides with the vector space of the n-linear Hilbert–Schmidt functionals on E1×···×En, for some choice of r,r1,…,rn∈]0,+∞], satisfying 1/r≤1/r1+···+1/rn. We show that the answer to this question is no. Moreover, we show that the same question, for n≥2 and mappings with values in infinite dimensional Hilbert spaces, has the answer no
On a question of Pietsch about Hilbert-Schmidt multilinear mappings
No full textIn 1983, Pietsch asked if, for n greater than or equal to 3 and all Hilbert spaces E-1,..., E-n, the vector space of the scalar valued absolutely (r;r(1),..., r(n))-summing multilinear mappings on E-1 x ... x E-n coincides with the vector space of the n-linear Hilbert-Schmidt functionals on E-1 x...x E-n, for some choice of r, r(1),..., r(n) is an element of ]0, +infinity], satisfying 1/r less than or equal to 1/r(1) + ... + 1/r(n). We show that the answer to this question is no. Moreover, we show that the same question, for n greater than or equal to 2 and mappings with values in infinite dimensional Hilbert spaces, has the answer no. (C) 2001 Academic Press.257234335
Himantolophus kalami Rajeeshkumar & Pietsch & Saravanane 2022, sp. nov.
No full textHimantolophus kalami sp. nov. New English name: Indian footballfish Figs. 1–3 Holotype. IO/SS/FIS/00712, female, 150 mm SL, Northern Andaman, Andaman Nicobar Islands, FORV Sagar Sampada, station 36708, 13.26° N, 93.26° E, 934 m, High Speed Demersal Trawl (HSDT), 06:36, 26 November 2017 Diagnosis. A species of the Himantolophus albinares -group having a simple but unique illicial morphology: anterior escal appendages absent; illicium short; relatively long, symmetrically divided posterior escal appendages (33.3% SL), with equally divided tips (2.7% SL); a simple basimedial filament and a pair of basilateral filaments on the ventral side of the esca; illicial stem and escal appendages without lateral appendages or filaments. Description. Metamorphosed female, body globose, but slightly elongated; illicium emerging from between eyes; distance between upper jaw symphysis to origin of illicium, 20 mm (13.3% SL); illicium short and stout, 36.5 mm long (24.3% SL), without lateral appendages on stem; relatively large esca, length of escal bulb 9.0 mm (6.0% SL), width 5.0 mm (3.2% SL), depth 6.0 mm (3.9% SL); distal escal swellings distinctly divided into two lateral lobes, escal pore on posterior margin of bulb in between lateral lobes; a simple, slender unpaired basimedial filament, 7.5 mm long (5.0% SL) emerging from ventral side of esca just below escal pore; a pair of basilateral filaments, 8.5 mm long (5.6% SL) emerging from posteriolateral surface of esca (Figs. 2A–C, 3). Well-developed sphenotic spines; sphenotic width 27 mm (18.0% SL); posterior escal appendage unusually long, 50 mm (33.3% SL), divided near base into two main branches, each main branch bifurcated at tip, each tip equal in length, 4.0 mm long (2.6% SL); undivided part of escal appendage, 9.0 mm long (6.0% SL); entire illicial stem and escal bulb fully covered with minute dermal spinules. Length of posterior escal appendages sparsely covered with minute dermal spinules except at divided tips. Dorsal-fin rays 5, first and second rays closely packed, remaining bifurcated; anal-fin rays 4, first simple, remaining rays bifurcated. Caudal-fin rays 9, first two and last two rays closely packed, remaining rays bifurcated. Approximately 60 small and large dermal spines on each side of body. Five or six dermal spines on pectoral-fin base. Snout and chin with well-developed wartlike papillae. Jaw teeth arranged in several oblique series, both halves of upper jaw teeth 93, lower jaw teeth 82. Longest tooth in upper jaw 4.0 mm (2.6% SL), lower jaw tooth 6.0 mm (4.0% SL). Eye diameter 5.0 mm (3.3% SL), length of illicial stem 39 mm (26.0% SL). Coloration. Body uniform bluish black when fresh (Fig. 1A); dorsal, anal and caudal fins, and especially the membranes between rays light pink with black edges; pectoral fins dark purple. Illicium black, entire distal appendages deep blue except divided tips and escal bulb at base of distal appendages which are silvery white. Escal swelling white, half of lateral lobes white, remaining portion pigmented. White patches on skin absent.When preserved (Fig. 1B) entire body and illicium brown except esca which somewhat retains its original coloration. Distribution. The new species is known only from the type locality, in the eastern part of the northern Andaman Islands, trawled off the bottom at a depth of 934 m. Etymology. The species is named in honor of Dr. A.P.J. Abdul Kalam, an eminent aerospace scientist and former President of India, for his many contributions to the field of space research and India’s missile technology. He was very keen in encouraging students and greatly motivated them with his inspiring books and speeches.Published as part of Rajeeshkumar, Meleppura, Pietsch, Theodore W. & Saravanane, Naryanane, 2022, A new species of deep-sea anglerfish, genus Himantolophus (Lophiiformes: Himantolophidae) from the Andaman Sea, India, pp. 589-594 in Zootaxa 5178 (6) on page 590, DOI: 10.11646/zootaxa.5178.6.6, http://zenodo.org/record/703750
Pietsch, T.W. and Grobecker, D.B. — Frogfishes of the World. Systematics, Zoogeography, and Behavioral Ecology. Stanford University Press, Stanford CA, 1987
No full textBourlière F. Pietsch, T.W. and Grobecker, D.B. — Frogfishes of the World. Systematics, Zoogeography, and Behavioral Ecology. Stanford University Press, Stanford CA, 1987. In: Revue d'Écologie (La Terre et La Vie), tome 44, n°4, 1989. p. 407
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