291 research outputs found
Malaxis corymbosa Kuntze, Revis. Gen. Pl.
No full textMalaxis corymbosa (S.Watson) Kuntze, Revis. Gen. Pl. 2: 673. 1891. Voucher: L.O. W illiams & A. Molina R. 10369 (EAP).Published as part of Vega, Hermes, Cetzal-Ix, William, Mó, Edgar, Romero-Soler, Katya J. & Basu, Saikat K., 2022, An Updated Checklist of the Orchidaceae of Honduras, pp. 1-80 in Phytotaxa 562 (1) on page 60, DOI: 10.11646/phytotaxa.562.1.1, http://zenodo.org/record/707369
Typhlopolycystis pluvialiae Schockaert & Moons & Janssen & Tessens & Reygel & Revis & Jouk & Willems & Artois 2019
No full textTyphlopolycystis pluvialiae n. sp Artois, Jansens and Schockaert. (Figs 10 A–D) Diagnosis. Colourless species of Typhlopolycystis, about 1 mm long with a proboscis of 1/4 of the body length and without eyes. The prostate stylet is curved, 63 µm long with a thickened proximal “head” of about 29 µm at its concave side (x in Fig. 10D). The accessory stylet is attached to the prostate stylet at the opposite side. It makes a turn of 180° and then follows the curve of the prostate stylet; it ends in a point and is 74 µm long, measured from the place where it is attached to the prostate stylet. Occurrence. Spain: Isle of Lanzarote (Canary Islands), Mala, large sand patch among rocks, medium-fine, calcareous sand, not well-oxygenated (reduced just below surface), 20 m deep (29°5' 0.53"N, 13°26' 59.10"W) (by Artois & Jansens, 0 8 October 2011) (Type Locality). Material examined. Observations and micrographs of a living animal. One whole mount (Holotype, SMNH nr 8916). Etymology. Pluvialia was the Roman name of Lanzarote.Published as part of Schockaert, Ernest R., Moons, Patricia, Janssen, Toon, Tessens, Bart S., Reygel, Patrick C., Revis, Nathalie, Jouk, Philippe E. H., Willems, Wim R. & Artois, Tom J., 2019, On the genus Typhlopolycystis Karling, 1956 (Platyhelminthes, Kalyptorhynchia, Polycystididae), with data on the five known species and the description of eleven new species, pp. 81-104 in Zootaxa 4603 (1) on pages 92-93, DOI: 10.11646/zootaxa.4603.1.4, http://zenodo.org/record/267330
Typhlopolycystis norenburgi Schockaert & Moons & Janssen & Tessens & Reygel & Revis & Jouk & Willems & Artois 2019
No full textTyphlopolycystis norenburgi n. sp Artois and Schockaert. (Fig. 6) Diagnosis. Species of Typhlopolycystis around 2 mm, without eyes and with a small proboscis, 1/8 of the body length. The prostate stylet is 25 µm long, 14 µm at its base. It narrows to 5 µm and broadens to about 11 µm at the end. The accessory stylet is 49 µm long with a funnel-like proximal end; the opening is 11 µm wide and the stylet narrows quickly to 4 µm and ends at less than 1 µm. The distal half of the accessory stylet makes a circular turn of 180°. The proximal ring is about 18 µm in diameter. The seminal receptacle consists of two successive vesicles. Occurrence. Panama: Isla Pedro Gonzalez (Las Perlas), coarse sand from near to a mangrove, 2.5 m deep at medium level tide (8°23'14.57"N, 79° 5'1.73”W) (by Artois, December 12, 2011) (Type Locality). Material examined. Observations and micrographs of the living animal. One whole mount designated the holotype (USNM nr 1523610). Etymology. Species name in honour of Dr. J. Norenburg (Smithsonian Institution), who organised the sampling campaign in Panama in 2011.Published as part of Schockaert, Ernest R., Moons, Patricia, Janssen, Toon, Tessens, Bart S., Reygel, Patrick C., Revis, Nathalie, Jouk, Philippe E. H., Willems, Wim R. & Artois, Tom J., 2019, On the genus Typhlopolycystis Karling, 1956 (Platyhelminthes, Kalyptorhynchia, Polycystididae), with data on the five known species and the description of eleven new species, pp. 81-104 in Zootaxa 4603 (1) on page 89, DOI: 10.11646/zootaxa.4603.1.4, http://zenodo.org/record/267330
The Dead-anyway Effect Revis(it)ed
No full textIn the expected-utility theory of the monetary value of a statistical life, the so-called “dead-anyway” effect discovered by Pratt and Zeckhauser (1996) asserts that an individuals' willingness to pay (WTP) for small reductions in mortality risk increases with the initial level of risk. Their reasoning is based on differences in the marginal utility of wealth between the two states of nature: life and death. However, this explanation is based on the absence of markets for contingent claims, i.e. annuities and life insurance. This paper reexamines the “dead-anyway” effect and establishes two main results: first, for a risk-averse individual without a bequest motive, marginal WTP for survival does increase with the level of risk but when insurance markets are perfect, this occurs for a different reason than given by Pratt and Zeckhauser. Secondly, when the individual has a bequest motive and is endowed with a sufficient amount of non-inheritable wealth, the effect of initial risk on WTP for survival is reversed: the higher initial risk the lower the value of a statistical life.value of life, expected utility, willingness to pay, insurance markets
Coelogyne albiflora M. W. Chase & Schuit. 2021, comb. nov.
No full textCoelogyne albiflora (Ridl.) M.W.Chase & Schuit., comb. nov. Basionym: Zetagyne albiflora Ridl., J. Nat. Hist. Soc. Siam 4: 118 (1921). Homotypic synonym: Panisea albiflora (Ridl.) Seidenf., Contr. Revis. Orchid Fl. Cambodia. Laos Vietnam: 87 (1975).Published as part of Chase, Mark W., Gravendeel, Barbara, Sulistyo, Bobby P., Wati, Richa Kusuma & Schuiteman, André, 2021, Expansion of the orchid genus Coelogyne (Arethuseae; Epidendroideae) to include Bracisepalum, Bulleyia, Chelonistele, Dendrochilum, Dickasonia, Entomophobia, Geesinkorchis, Gynoglottis, Ischnogyne, Nabaluia, Neogyna, Otochilus, Panisea and Pholidota, pp. 94-134 in Phytotaxa 510 (2) on page 101, DOI: 10.11646/phytotaxa.510.2.1, http://zenodo.org/record/542633
Brunetorhynchus deconincki Schockaert, Martens, Revis, Janssen, Willems & Artois, 2014, n. sp.
No full textBrunetorhynchus deconincki n. sp. Schockaert, Martens & Artois (Fig. 1) Holotype. A whole mount (SMNH 7836), Bay of Marseille, France, “La Pierre Joseph” near the Isle Plane, 17 m deep, fine-grained sand (type locality)(11 May 1967, leg M. Brunet). Paratype. One serially-sectioned specimen from the type locality (HU, no 541). Other material and localities. One whole mount and two serially-sectioned specimens (HU, nos VI. 1.47–49), Bay of Marseille, France, west from the northern tip of Isle Pomègues, muddy sand with small pebbles, 35 m deep (26 July 1967). A whole mount and one serially-sectioned specimen (HU, nos VI. 1.50 –VI. 2.1), Bay of Marseille, France, Cap Canaille, near Cassis, 16 m deep, fine-grained sand (26 January 1967). One whole mount (HU, no VI. 2.2), Corsica, Bay of Calvi, France, fine-grained sand with some detritus and silt, 39 m deep (11 June 1982). Two whole mounts and one serially-sectioned specimen (HU, nos VI. 2.3 –VI. 2.5), harbour of the Station de Recherches Sous-marines et Océanographiques (STARESO), Pointe Revellata, Corsica, Bay of Calvi, France, coarse-grained sand with some silt, 4 m deep (7 April 1983). Etymology. Species epithet in honour of the late Prof. Dr. Lucien De Coninck, Ghent University, Belgium, teacher of the first author (ERS). Diagnosis. Species of Brunetorhynchus with a slightly bent, tubular stylet 75–100 µm long and 8–10 µm broad, narrower in the distal quarter, with a thickened proximal rim, open at one side from where two spirallyrunning ridges depart and run counter clock-wise over the stylet. Prostate vesicle (type III) rudimentary, in approximately 1 / 3 of the proximal part of the male atrium. Description. Colourless to light brownish-pink animals, 0.8–1 mm long, with eyes far apart from each other (i.e. closer to the lateral rim than to each other). The proboscis is about 1 / 4 th to 1 / 5 th of the body length (in sections) with parallel cone retractors and a thick internal circular muscle layer. There are four proboscis retractors and a pair of ventral integument retractors. There are no nuclei at the junction but there are four nuclei about half way along the proboscis sheath where the epithelium is slightly thicker and where four sheath dilatators insert. The syncytial epidermis with few lobate nuclei is 2.5–3 µm thick with a slightly thicker basement membrane and cilia 2.5–3 µm long. The epidermis contains densely-packed small granules under its surface. The pharynx with the usual polycystidid construction is at about 30–40 %. The common genital pore is at about 80 % in the living animal but closer to the caudal end in sections. The genital atrium receives the uterus (with the normal polycystidid construction) at its anterior side and continues in the dorsal direction, where it receives the male atrium frontally and the female duct dorsally. The atria are lined with a very low epithelium with depressed nuclei and are surrounded by a weak muscle layer. The single testis is situated next to and just behind the pharynx at the left side. The male atrium, at the right side, is surrounded by a relatively weak, spirally running muscle layer. The large seminal vesicle is lined with a low epithelium and surrounded by thin, spirally running muscle fibres. Distally it narrows to a short seminal duct towards the stylet. Next and left to the seminal vesicle there is the large accessory vesicle (type II), filled with a coarse-grained, basophilic secretion and surrounded by a spiral muscle layer. Distally it forms a narrow duct that enters the stylet next to the seminal duct. The male atrium is somewhat broadened in its proximal third where it contains a small prostate vesicle (type III). Its slightly basophilic secretion is arranged in two or three fascicles, probably formed by one single cell, since only one nucleus can be found. The stylet (an accessory stylet type II) is 75–100 µm (m = 91 µm, n = 5) long and 8–10 µm broad over the proximal 4 / 5 th, narrower in the last 5 th. The proximal rim is thickened and open at one side from where two ridges run spirally, counter-clock wise, over the entire length of the stylet. The distal opening is subterminal. The ovary is unpaired, at the left side; the paired vitellaria join close to the ovary to form the vitelloduct, which enters into a wide oviduct, next to the ovary. In its caudal part the oviduct is transformed into a resorbing bursa. Dorsally and close to the ovary a pear-shaped vesicle, the seminal receptacle, is attached to the oviduct. It is surrounded by thin inner circular muscles and outer longitudinal muscles, both layers gradually disappearing distally. At the side opposite to the ovary, the female duct type I departs. The opening towards the female duct is surrounded by eosinophilic glands and is guarded by a sphincter. The female duct is lined with a ruffled or low epithelium and surrounded by inner circular muscles and outer longitudinal muscles, arranged in bundles (see Fig. 1 I). In several specimens (sectioned and in whole mounts, but not in all) the female duct has a spherical aspect, probably a fixation artefact.Published as part of Schockaert, Ernest R., Martens, Paul M., Revis, Nathalie, Janssen, Toon, Willems, Wim & Artois, Tom J., 2014, A new genus with six new species of Typhlopolycystidinae Evdonin, 1977 (Platyhelminthes, Kalyptorhynchia, Polycystididae), pp. 259-272 in Zootaxa 3755 (3) on pages 261-262, DOI: 10.11646/zootaxa.3755.3.4, http://zenodo.org/record/22926
Orostylis gen. nov., a new genus of Dalytyphloplanida with seven new species (Platyhelminthes: Rhabdocoela)
No full textWe describe a new genus of dalytyphloplanid rhabdocoels, with seven new species. Orostylis gen. nov. has a unique
combination of characters including the presence of a sclerotised stylet, an anteriorly positioned male copulatory organ
with the male genital pore in the buccal cavity, and the absence of an oviduct. The ovary empties directly into the intestinal
lumen. Orostylis dohae sp. nov., Orostylis asinaraensis sp. nov., Orostylis caecus sp. nov., Orostylis distortus sp. nov.,
Orostylis donanae sp. nov., Orostylis gallicus sp. nov., and Orostylis timucuorum sp. nov. are distinguished from each
other by the structure of the sclerotised parts of the male copulatory organ. Molecular and morphological evidence place
the new genus in Neodalyellida Willems et al. 2006, and similarities with other taxa are discussed
The reactions of oligodendroglia in Wallerian degeneration
No full textThis investigation was carried out at the instigation of Dr. W. V. Cone in the attempt to discover chronic pathological changes in oligodendroglia. Knowledge of chronic changes in the oligodendrocytes has not been greatly advanced m the past twenty years. At that time it was stated that: "Unlike astrocytes, the disappearance of myelin does not result in an increase but a decrease of the oligodendrocytes and it is quite possible that with myelin degeneration oligodendrocytes are transformed into astrocytes." (Penfield 1932)
Sign of our Times? Revis(it)ing the International Symbol of Access
No full textpeer reviewedThe International Symbol of Access (ISA), used in a variety of specific locations to represent purposely facilitated access, has become ubiquitous throughout the world within just a few decades. Found wherever people move in physical space and needing to navigate environmental barriers, this symbol is among the most widely recognized representations of disability. While it provides daily interactions with issues of accessibility and disability, its purposes and design in different cultural contexts are neither obvious nor uncontested. We sketch the origin, goals and critiques of this prominent symbol and discuss its functions, from way showing to identity construction and advocacy/activism. Finally, we examine current proposals for alternative symbols
Gagea bulbifera Salisb., Ann. Bot.
No full text5. Gagea bulbifera (Pall.) Salisb., Ann. Bot. 2: 557 (1806). Ornithogalum bulbiferum Pall., Reise Russ. Reich 2: 736 (1773). Stellaster bulbifer (Pall.) Kuntze, Revis. General. Pl. 2: 715 (1891). Hornungia bulbifera (Pall.) Rouy, G. Rouy & J. Foucad, Fl. France 12: 381 (1910). Type: RUSSIA. (Astrakhan): in aridis limosis ad Wolgam et Jaicum, Pallas s.n. (holotype LINN 428.17!, isotypes BM!, M!).Published as part of Zarrei, Mehdi, Wilkin, Paul & Chase, Mark W., 2011, Gagea Salisb. (Liliaceae) in Iran: an updated species checklist, pp. 33-43 in Phytotaxa 15 on page 36, DOI: 10.11646/phytotaxa.15.1.5, http://zenodo.org/record/490692
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