Transactions of the American Microscopical Society最新文献

{"title":"Cestoda from Lake fishes in Wisconsin : the morphological identity of plerocercoids of Proteocephalus ambloplitis","authors":"O. Amin, M. Boarini","doi":"10.2307/3226608","DOIUrl":"https://doi.org/10.2307/3226608","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"51 1","pages":"193-198"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74935292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A redescription of types of the clam shrimp Eulimnadia agassizii (Spinicaudata : Limnadiidae)","authors":"Douglas G. Smith","doi":"10.2307/3226611","DOIUrl":"https://doi.org/10.2307/3226611","url":null,"abstract":"Among the described North American species of the clam shrimp family Limnadiidae, Eulimnadia agassizii is poorly known, having been reported from only two localities in extreme southeastern New England. Though recently reported as nonexistent, the original specimens of this species are in the type collection of the Museum of Comparative Zoology, Harvard University. Specific data regarding the collection and an emended and expanded description of the type material are provided, using traditional and contemporary characters, to complement recent studies of the group. In a revision of the Recent Limnadiidae of North America, Belk (1989) discussed traditional characters used to diagnose species and suggested that egg shell morphology demonstrates less intraspecific variation, thus allowing more confident separation of species. Among the several named forms included in his review was Eulimnadia agassizii, a poorly known species from southeastern New England. E. agassizii was described (as Limnadia) from Penikese Island in what is now the town of Gosnold, Barnstable County, Massachusetts, by Packard (1874a). Along with a stone plaque and a few obscured foundations, the description of E. agassizii is all that remains of an early attempt to establish a marine biology laboratory on the island (later permanently founded at nearby Woods Hole, Massachusetts). Packard (1883) eventually included E. agassizii in his genus Eulimnadia, first formally proposed as a subgenus (Packard, 1847b). Eulimnadia has been recognized by most subsequent authors, although Webb & Bell (1979) reviewed earlier data that suggested overlap in the two taxa and recommended that Eulimnadia be synonymized with Limnadia. Additional study is needed to resolve the two views. Belk (1989) remarked that Packard did not \"leave any type material.\" In fact, the specimens collected by Walter Faxon on Penikese Island, and certainly the same or part of the same collection used by Packard, exists in the Museum of Comparative Zoology, Harvard University, at Cambridge, Massachusetts. The specimens are labeled as \"types\" and are in the type collection but have not been cataloged. No specific holotype was designated. Unaware of the collection, Belk (1989) used specimens of E. agassizii collected in Woods Hole, Massachusetts, to characterize E. agassizii. Though the Woods Hole collection is useful for purposes of comparison with other species, it nevertheless would be useful to provide an accurate redescription of the type collection. Using type material, I redescribe the species below. Variations in certain characters 11 thank Ellie Armstrong-Prosser of the Grey Museum for kindly loaning their collection of Eulimnadia agassizii for study. Dr. Denton Belk provided comments on different drafts of the manuscript. TRANS. AM. MICROSC. Soc., 111(3): 223-228. 1992. ? Copyright, 1992, by the American Microscopical Society, Inc. This content downloaded from 207.46.13.11 on Wed, 19 Oct 2016 04:41:46 UTC All use s","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"24 1","pages":"223-228"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77206824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Significance of Small Organic Chelators in Laboratory Cultures of Ephydatia fluviatilis (Porifera: Spongillidae)","authors":"F. Belas, J. C. Francis, M. Poirrier","doi":"10.2307/3226606","DOIUrl":"https://doi.org/10.2307/3226606","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"12 1","pages":"169-179"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81032112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Morphology of Epithemata (Polar Chorionic Structures) in the Eggs of Ephemerella ignita (Ephemeroptera: Ephemerellidae)","authors":"E. Gaino, E. Bongiovanni","doi":"10.2307/3226613","DOIUrl":"https://doi.org/10.2307/3226613","url":null,"abstract":"The eggs of the mayfly Ephemerella ignita (Ephemeroptera: Ephemerellidae) are characterized by a polar adhesive structure, the epithema. The epithema prevents egg drift following deposition in water by extending a network of threads. Mated females lay an aggregate of eggs that is attached to the last abdominal sternites. Within the aggregate, eggs with differently shaped epithemata are arranged in a well-defined pattern. Three types of eggs were defined by three types of epithemata, namely short, bulging, and long. In addition, histological observations confirmed the thread-like composition of the epithemata and their peculiar arrangement in each type. Short and long epithema egg types differed also by their total lengths. Structural changes in the architecture of the epithemata are discussed in relation to a different function of such devices. The fine structure of the egg chorionic pattern in Ephemeroptera has been used, as with other insect orders, to elucidate differences and relationships among species (Alba-Tercedor & Sowa, 1987; Gaino et al., 1987, 1989; Gaino & Mazzini, 1984; Mazzini & Gaino, 1990). In addition, ultrastructural studies on mayfly eggs have indicated the adhesive function of their peculiar projections, which may be involved in preventing egg drift following deposition in water (Gaino & Mazzini, 1987, 1988). As a consequence, shell surface structures may give some insight into the devices developed by different species to survive in their respective habitats (Gaino & Mazzini, 1988). Ootaxonomy is based chiefly on the species-specificity of chorionic architecture, which is constant within the representatives of a species. For instance, the organization of the mayfly egg has been employed to classify the order and to recognize nymph and adult stages in the same species (Koss, 1968). The polar devices, referred to as the \"epithema\" (this term having been introduced first by Bengtsson, 1913) or \"polar cap\" (terminology after Koss & Edmunds, 1974), is a unique chorionic structure in eggs of Ephemerella ignita Poda at the posterior polar region and is involved in egg adhesion to the substratum. The occurrence of eggs with adhesive polar devices of different lengths in E. ignita were noted earlier and were considered to be related to the position of the eggs within the ducts (Bengtsson, 1913; Degrange, 1960). This observation might have relevant implications in the field of ootaxonomy and may imply additional functions. The primary objective of this paper is to describe and document the ultraWe thank Prof. C. Falugi and Dr. C. Pesce for their helpful criticisms and F. Di Lauro for his technical assistance. This research was supported by the Italian Ministry for Public Education (M.U.R.S.T.40% and 60% funds). TRANS. AM. MICROSC. SOC., 11 l(3): 255-265. 1992. O Copyright, 1992, by the American Microscopical Society, Inc. 256 TRANS. AM. MICROSC. SOC. structural features of the eggs of E. ignita with emphasis on variations among epithe","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"61 1","pages":"255-265"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79603316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cephalic tubercles, a new character useful for the taxonomy of desmoscolecidae (Nematoda)","authors":"Y. Shirayama, W. Hope","doi":"10.2307/3226610","DOIUrl":"https://doi.org/10.2307/3226610","url":null,"abstract":"The cephalic regions of 10 nematode species of the family Desmoscolecidae were examined by scanning electron microscopy (SEM). They belonged to two genera, Tricoma and Desmoscolex, which were collected from off the coasts of Japan, Caribbean Sea, Clew Bay (Ireland), and Thailand. The basic structure of the lip region was the same within Tricoma regardless of geographic region, but a distinct intergeneric difference was found. In species of this genus, six conspicuous outer labial sensilla protruded from the smooth lip surface, and the circular ridges corresponding to the boundary of the closed oral aperture, the external rim of the labia, and the anterior rim of the cephalic concretion ring were distinctive. On the other hand, the labial surface of specimens of the genus Desmoscolex was covered by a variety of small, tuberculate structures. These cephalic tubercles were 70-240 nm in diameter and recognizable only by SEM examination. The shape of the cephalic tubercles and the area of the head covered by them were constant within the same species, but differed among species. The labial sensilla were surrounded and obscured by specialized cephalic tubercles in Desmoscolex. The cephalic tubercles were found only in adults of Desmoscolex. These results suggested that the presence of cephalic tubercles is a synapomorphic character of Desmoscolex, and that it is useful for phylogenetic studies of the Desmoscolecidae. The family Desmoscolecidae is a unique group of free-living nematodes characterized by desmens, which are thick, transverse rings considered to consist of sedimentary particles and cementing materials (desmos). Earlier taxonomic revisions of the family by Timm (1970) and Freudenhammer (1975) were based mainly upon external structures, in particular the shape and number of the desmens and the shape and arrangement of somatic setae on each desmen. Decraemer (1974, 1975a,b, 1977, 1978a,b, 1979, 1984) studied this group extensively; recently, she has revised the order Desmoscolecida using the methods of phylogenetic systematics (cladistics) and character states of both external and internal morphology (Decraemer, 1985). Scanning electron microscopy (SEM) is a most useful technique in taxonomic studies of nematodes (Hirschmann, 1983). This is especially true in studies of Desmoscolecidae because precise observations of external structures are essential for classification within the family. SEM also can reveal details that are not resolved by ordinary light microscopic techniques. During a SEM investigation of deep-sea nematodes collected from the western 1 This research was supported in part by a postdoctoral fellowship awarded to Y. Shirayama from the Smithsonian Institution. The authors thank Abbie Yorkoff, Brian Kahn, Susann Braden, and Walter Brown for their technical assistance. Drs. Robert P. Higgins and Chittima Aryuthaka provided part of the material used in this research. 2 To whom correspondence should be directed. 3 Present address: ","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"193 1","pages":"211-222"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75847930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrastructure of the Penis Papilla and Antrum of Dugesia tigrina (Platyhelminthes: Tricladida)","authors":"W. Fischlschweiger","doi":"10.2307/3226607","DOIUrl":"https://doi.org/10.2307/3226607","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"6 1","pages":"180-192"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90827961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pterocystis ebelii, a new species of heliozoa from India","authors":"D. Wujek, P. Elsner","doi":"10.2307/3226670","DOIUrl":"https://doi.org/10.2307/3226670","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"1 1","pages":"143-148"},"PeriodicalIF":0.0,"publicationDate":"1992-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76129076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nuclear fine structure during development in Heliophrya sp. (Ciliophora : Suctoria)","authors":"D. P. Fox, Bruce F. Hill, G. Chapman","doi":"10.2307/3226669","DOIUrl":"https://doi.org/10.2307/3226669","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"56 1","pages":"128-142"},"PeriodicalIF":0.0,"publicationDate":"1992-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86031799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen Fixation: Achievements and Objectives","authors":"W. S. Silver, P. Gresshoff, L. Roth, G. Stacey, W. Newton","doi":"10.2307/3226673","DOIUrl":"https://doi.org/10.2307/3226673","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"100 1","pages":"166"},"PeriodicalIF":0.0,"publicationDate":"1992-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75443990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biophysical Electron Microscopy","authors":"G. Chapman, P. Hawkes, U. Valdré","doi":"10.2307/3226674","DOIUrl":"https://doi.org/10.2307/3226674","url":null,"abstract":"","PeriodicalId":23957,"journal":{"name":"Transactions of the American Microscopical Society","volume":"18 1","pages":"167"},"PeriodicalIF":0.0,"publicationDate":"1992-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80107915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}