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D R Brooks

Publications and source records attributed to D R Brooks.

82 records · Page 5Linked to original sources
PubMed1985

Phylogenetics and the future of helminth systematics.

Phylogenetic systematics is a relatively new formal technique that increases the precision with which one can make direct estimates of the history of phylogenetic descent. These estimates are made in the form of phylogenetic trees, or cladograms. Cladograms may be converted directly into classifications or they may be used to test various hypotheses about the evolutionary process. More than 20 phylogenetic analyses of helminth groups have been published already, and these have been used to investigate evolutionary questions in developmental biology, biogeography, speciation, coevolution, and evolutionary ecology.

Animals↗
PubMed1984

Information and entropy in a simple evolution model.

A model of evolution which combines mutations and speciation mechanisms is presented and analyzed. Information and entropy of the populations generated by the model are calculated and followed through history. It is found that the model allows simultaneous increase of information and entropy with time, consistent with notions of physical entropy increase as well as biological evolution.

Biological Evolution↗
PubMed1982

Spirorchidiasis in loggerhead sea turtles (Caretta caretta): pathology.

Loggerhead sea turtles (Caretta caretta) from the Atlantic seaboard (Florida to Massachusetts) were examined at the Marine Pathology Laboratory, University of Rhode Island, from March through December, 1980. Three genera of blood flukes (spirorchids) were found in 14 (33%) of the 43 turtles. Gross signs in heavily infected animals included cachexia, anemia and enteritis. Histopathological lesions were similar to those present in homeotherms with schistosomiasis. Granulomatous gastritis, enteritis, hepatitis, pneumonitis, and nephritis were present. Acute and chronic vasculitis accompanied metastasis of eggs. Infected animals had severe hepatic hemosiderosis, indicative of the anemia observed grossly. Evidence is presented that spirorchidiasis is prevelent in sub-adult loggerhead sea turtles, is responsible for extensive lesions and may be responsible for significant debilitation and mortality.

Animals↗
PubMed1981

Six platyhelminths from Malaysian reptiles including Paradistomoidella cerberi n.g., n.sp. (Digenea: Dicrocoeliidae).

Paradistomoidella cerberi n.g., n.sp. and Paracanthostomum cerberi from Cerberus rhynchops, Xenopharynx pyriformis and Allopharynx mehrai from Ptyas korros, Neopronocephalus orientalis from Geoemyda spinosa, and Duthiersia expansa from Varanus salvator are all reported from the area of Kuala Lumpur, Malaysia. Paradistomoidella cerberi most closely resembles members of Paradistomoides but is characterized by relatively short caeca, a cirrus sac containing a bipartite rather than sinous internal seminal vesicle, and unevenly-sized suckers. Kuala Lumpur is a new locality for Paracanthostomum cerberi, X. pyriformis, A. mehrai, and D. expansa. Ptyas korros is a new host for X. pyriformis and G. spinosa is a new host for N. orientalis.

Animals↗
PubMed1980

Macaca mulatta--a new host for Choanotaenia cestodes.

A juvenile Macacca mulatta that died following a peracute illness was found to be harboring about 25 mature Choanotaenia infundibulum tapeworms. These cestodes commonly infest birds, occasionally insectivores and rodents but have never been reported in nonhuman primates.

Animals↗
PubMed1976

Two tetraphylidean cestodes from the freshwater stingray Potamotrygon magdalenae Dumeril 1852 (Chondrichthyes: Potamotrygonidae) from Colombia.

Two new tetraphyllidean cestodes are described from the freshwater stingray Potamotrygon magdalenae from Colombia. The new genus Potamotrygonocestus is proposed for P. magdalenensis, which differs from Pedibothrium by having a bilobed rather than X-shaped ovary, and simple rather than bifid hooks. It further differs from Pachybothrium hutsoni by having bothridial hooks inserted immediately posterior to an accessory sucker rather than inserted in the middle of a thick muscular pad. Potamotrygonocestus magdalenensis is unique among known tetraphyllideans by possessing vitellaria which are compact, cylindrical bands in the lateral portions of the middle of the proglottid. The second new species, Rhinebothrium moralarai, resembles R. scorzai by having its genital pore and terminal genitalia at the ovarian level, greatly reduced poral ovarian lobes, and by parasitizing a freshwater stingray. It differs from R. scorzai in number of bothridial loculi, testes per proglottid, and proglottids per strobila; by having quadrate rather than canoe-shaped bothridia; and by parasitizing Potamotrygon magdalenae rather than P. hystrix.

Animals↗