DOCSLIB.ORG

The Nephridium of Lumbricus and Its Blood- Supply; with Remarks on the Nephridia in Other Chsetopoda

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Nephridium of Lumbricus and Its Blood- Supply; with Remarks on the Nephridia in Other Chsetopoda THE NEPHRIDITJM OF LUMBRIOUS. 293 The Nephridium of Lumbricus and its Blood- supply; with Remarks on the Nephridia in other Chsetopoda. By W, Blaxland Benham, D.Sc. (Loud.), Anatomical Department, Oxford. With Plates XXIII—XXV. THE nephridium of the common earthworm has recently been the subject of a contribution by Dr. Groehlich (20), in which he remarks on various statements made by Gegenbaur in his classical paper on the subject, published in 1853 (19), in which he corrected the then prevailing view that the seg- mentally arranged tubes were respiratory, and suggested their excretory function. As several of Goehlich's statements are at variance with those of Gegenbaur I was led to look into the details of the organ, and I then found that on those points the more recent writer was in error, and that Gegenbaur's description is much more nearly correct than Goehlich's. In fact, I have not very much to add to the description of the earlier writer beyond matters of histological detail, and more especially the blood-supply, which Professor Lankester suggested that I should work out. The work was carried out in the Zoological Laboratory of University College during the past eighteen months. 294 W. BLAXLAND BENHAM. CONTENTS OF PAPER. 1. Nomenclature of the parts of the nephridium, and the course of the various regions. 2. Histology of the various regions, and suggestions as to their function. 3. Comparison with the nephridium in other genera. 4. The nephrostome of Perichseta malamaniensis, n. sp., and other genera. 5. Circulation in the nephridium. 6. The nephridium of Arenicola. 1. NOMENCLATURE OF THE PARTS AND COURSE OF THE VARIOUS REGIONS. The long winding tube which constitutes the excretory organ of Lumbricus is for the most part embedded in a coating of vesicular cells, which are in their turn surrounded by the pavement-cells of the coelomic epithelium. The tube is, in its adult condition, as in its development, divisible into two portions: (I) a praseptal portion, consisting of the in- ternal funnel or nephrostome and a short ciliated tube; and (II) a much more extensive post-septal portion. The latter is readily distinguishable into four regions: (1) the very long but narrow tube in continuity with the praeseptal tube; (2) the short brownish ciliated middle tube; (3) the wide large tube; and (4) the muscular tube or duct, which opens to the exterior. The first three of these tubes (1, 2, 3) are twined about in rather a complicated but quite constant manner, and are bound together by the coat of vesicular cells in such a way as to form two great " loops," visible fairly distinctly with the naked eye when an opened worm is covered by spirit. Another "loop" is formed by the muscular duct (4). This last I will call the "first loop" (E, figs. 1, 2, 3); the "second loop" (F) contains the greater part of the narrow tube (1), and of the large tube (3); finally, the " third loop" (a) consists of a part of the narrow tube, a part of the large tube, and the whole of the middle tube (2). The course taken by these various regions, from the funnel to the external aperture, and the relations of the tubes to the THE NEPHBIDIUM OP LUMBBIOUS. 295 loops, will be readily seen by a glance at fig. 2, which will convey more information than any verbal description. I will, therefore, pass on to the histology of the various parts. I will premise that, with the exception of the funnel itself, or rather a part of the funnel, together with probably the mus- cular duct, the canal of the nephridium is " intra-cellular," i. e. the nephridium consists of a large number of perforated or "drain-pipe" cells, placed end to end (see PI. XXIV, figs. 30, 31, 32). The size of the cell and the relative proportion occupied by the lumen constitute the main morphological differences observable in the various regions; but the character of the protoplasm is of very great physiological importance, although we do not fully know the exact function of each region. 2. THE STRUCTURE OF THE VARIOUS REGIONS. I. The Prseseptal Portion.—The nephrostome or funnel is carried at the end of the short portion of the " narrow tube " which passes through the anterior septum bounding a given somite. The character of this portion of the tube will be described below. This prseseptal portion of the tube is sur- rounded by a mass of vesicular cells, the outlines of which are readily seen in the living condition, and frequently in stained preparations. These cells resemble those coating the post- septal portion, and appear to be similar to those described and figured by Kukenthal round the vessels and nephridia of Tubifex (24), and not improbably they have the same meaning. The superficial cells are usually flattened, and form a coelomic epithelium continuous with that covering the septum. The funnel (PI. XXIII, figs. 4—7, and 32) has recently been figured by Goehlich (20) in some detail, but he has alto- gether misunderstood the appearance represented. As is well known, the funnel consists of a number of very long, narrow, somewhat wedge-shaped cells—which I shall call "marginal cells"—arranged around a central point. The nucleus in each is placed near the outer end of the cell, which is rounded TOL. XXXII, PART III.—NEW SER. U 296 W. BLAXLAND BENHAM. FIG. 1.—A nephridium treated with nitrate of silver, to show the pavement coelomic epithelium covering the vesicular tissue, and forming in parts a suspensory fenestrated mem- brane, which carries blood-vessels. E. First loop. F F. Second loop. G G. Third loop. N. Nerve-cord. S. Septum. SN, Subneural blood-vessel. V. Subintestinal blood-vessel, a. Somatic branch from subintestinal blood-vessel, d. Ventral part of commissural vessel, h, h, h. Suspensory membranes, carrying and covering the nephridial blood-vessels, i. The group of coelomic epithelial cells around the prseseptal region of the narrow tube. FIG. 1. 298 W. BLAXLAND BBNHAM. off peripherally, and ciliated all over one surface. Goehlich describes and figures one or two rows of specially long cilia radiating from the centre. These I have never seen, although I have had under observation hundreds of nephridial funnels in demonstrating to my students, and have examined carefully dozens for this very purpose. The appearance figured by Goehlich is due to a crumpling of the funnel—an action to which it is liable on being covered by a glass slip,—so that there will be caused radial folds, the cilia of which will then be seen side- ways instead of from above, will therefore be more distinct, and will appear longer. There are normally no such longer cilia or such radiating lines. Another phenomenon, which, indeed, renders the interpreta- tion of the central portion of the funnel difficult, is the col- lection of a mass of ccelomic corpuscles in the funnel. This gives rise to the appearance represented in Goehlich's figure, and which was considered by him to form part of the wall of the funnel; but a careful examination, both of fresh specimens and stained preparations, has convinced me that these cells do not belong to the funnel, but are cells of the coelomic fluid, in some cases dead or dying, which will probably be carried to the exterior, as Kukenthal has suggested. In the fresh state this group of cells or " debris " appears darker and less transparent than the cells of the funnel. Stained with borax carmine the nuclei have an appearance distinct from those of the nephridial cells, being brighter, more granular, and much smaller. In fact, many have the appearance of cells which have died, and have begun to disintegrate. This mass of cells is shown in figs. 5 and 6. In one case (that represented by fig. 6), in which the funnel was examined twenty-four hours after the worm had been killed, not only were the cilia still active, but some of the cells forming the debris were still amoeboid, one or two short pointed pseudo- podia being present (fig. 6, a). Another case (fig. 5), where the cells of the debris are relatively few, shows the shape of the real- mouth of the funnel, which is marked out by the aggregation of the cells into a crescentic mass. It was this THE NEPHRIDIUM OP IiTJMBRlCTJS. 299 specimen that first led me to a better understanding of the real nature of the funnel, for no existing drawings or description give any clue to the real mode of communication between the ccelom and the nephridial tube. I will now proceed to describe the true structure of the nephrostome. If we follow the " narrow tube " forwards from the septum to the funnel, we see in optical section the finely granular wall on each side, with the nuclei of the component cells alternately on this side and on that. Arrived at the centre of the funnel, or thereabouts, the two walls suddenly diverge, each bending outwards, and then sharply backwards nearly parallel to its former course (fig. 4). The true " drain-pipe " cells cease at this point of divergence. The backwardly directed, or " centrifugal cells," as they may be termed, are merely grooved1 (fig. 32), but otherwise resemble the drain- pipe cells in structure, being granular and ciliated. These grooved or " gutter " cells, in reality, lie in a different plane from the narrow tube, a higher plane when the funnel is viewed from in front; and they frequently hide the wall of the tube, as is the case in fig.
Load more

Recommended publications
  • Shell Morphology, Radula and Genital Structures of New Invasive Giant African Land
    bioRxiv preprint doi: https://doi.org/10.1101/2019.12.16.877977; this version posted December 16, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Shell Morphology, Radula and Genital Structures of New Invasive Giant African Land 2 Snail Species, Achatina fulica Bowdich, 1822,Achatina albopicta E.A. Smith (1878) and 3 Achatina reticulata Pfeiffer 1845 (Gastropoda:Achatinidae) in Southwest Nigeria 4 5 6 7 8 9 Alexander B. Odaibo1 and Suraj O. Olayinka2 10 11 1,2Department of Zoology, University of Ibadan, Ibadan, Nigeria 12 13 Corresponding author: Alexander B. Odaibo 14 E.mail :[email protected] (AB) 15 16 17 18 1 bioRxiv preprint doi: https://doi.org/10.1101/2019.12.16.877977; this version posted December 16, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 19 Abstract 20 The aim of this study was to determine the differences in the shell, radula and genital 21 structures of 3 new invasive species, Achatina fulica Bowdich, 1822,Achatina albopicta E.A. 22 Smith (1878) and Achatina reticulata Pfeiffer, 1845 collected from southwestern Nigeria and to 23 determine features that would be of importance in the identification of these invasive species in 24 Nigeria.
    [Show full text]
  • Study of Earthworm
    4.1 SYSTEMATICS POSITION,HABIT AND HABITAT 4.2 EXTERNAL CHARACTERS 4.3 DIGESTIVE SYSTEM 4.4 CIRCULATORY SYSTEM 4.5 EXCRETORY SYSTEM 4.6 REPRODUCTIVE SYSTEM 4.7 NERVOUS SYSTEM AND SENSORY ORGANS 4.8 ECONOMIC IMPORTANCE Systematic Position Phylum: Annelida Class: Oligochaeta Genus: Pheretima Species: posthuma Common Name: Earthworm Habit and habitat • These are nocturnal in habit and live in damp, moist, humus-rich soil of lawns, gardens etc. In dry weather they burrow deeper into the soil to avoid dryness. Their niche is a herbivore and macro-decomposer and is important as a source of food for birds. It also helps in soil aeration and increasing soil fertility. EXTERNAL CHARACTERS • Body is long, narrow and cylindrical. • Length may reach upto 150 mm. • Body colour is brown. • Anterior end is pointed while the posterior end is blunt. • Body is divided into 100-140 segments called metameres. • The anteriormost segment is called Prostomium. • Mouth is a crescentic aperture, present at anterior end. The segment containing mouth is called peristomium. • Setae are present at all the segments except-1st and last. Each seta is embedded in a setal sac. • A glandular band called Clitellum is situated in 14th to 16th segments. It forms coccon during the reproduction. • female genital pore is situated in 14th segment (ventral surface)while male genital pore is present in 18th segment. • The earthworm feeds on organic matter in the soil. • The food is sucked by the pharynx and the oesophageal glands add calcite to neutralise acidity of the soil. • The food is then grinded by the horny lining of the gizzard and is absorbed in the intestine.
    [Show full text]
  • (Gastropoda: Cocculiniformia) from Off the Caribbean Coast of Colombia
    ó^S PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON ll8(2):344-366. 2005. Cocculinid and pseudococculinid limpets (Gastropoda: Cocculiniformia) from off the Caribbean coast of Colombia Néstor E. Ardila and M. G. Harasewych (NEA) Museo de Historia Natural Marina de Colombia, Instituto de Investigaciones Marinas, INVEMAR, Santa Marta, A.A. 1016, Colombia, e-mail: [email protected]; (MGH) Department of Invertebrate Zoology, MRC-I63, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20013-7012 U.S.A., e-mail: [email protected] Abstract.•The present paper reports on the occurrence of six species of Cocculinidae and three species of Pseudococculinidae off the Caribbean coast of Colombia. Cocculina messingi McLean & Harasewych, 1995, Cocculina emsoni McLean & Harasewych, 1995 Notocrater houbricki McLean & Hara- sewych, 1995 and Notocrater youngi McLean & Harasewych, 1995 were not previously known to occur within the of the Caribbean Sea, while Fedikovella beanii (Dall, 1882) had been reported only from the western margins of the Atlantic Ocean, including the lesser Antilles. New data are presented on the external anatomy and radular morphology of Coccocrater portoricensis (Dall & Simpson, 1901) that supports its placement in the genus Coccocrater. Coc- culina fenestrata n. sp. (Cocculinidae) and Copulabyssia Colombia n. sp. (Pseu- dococculinidae) are described from the upper continental slope of Caribbean Colombia. Cocculiniform limpets comprise two paraphyletic, with the Cocculinoidea related groups of bathyal to hadal gastropods with to Neomphalina and the Lepetelloidea in- global distribution that live primarily on cluded within Vetigastropoda (Ponder & biogenic substrates (e.g., wood, algal hold- Lindberg 1996, 1997; McArthur & Hara- fasts, whale bone, cephalopod beaks, crab sewych 2003).
    [Show full text]
  • The Pax Gene Family: Highlights from Cephalopods Sandra Navet, Auxane Buresi, Sébastien Baratte, Aude Andouche, Laure Bonnaud-Ponticelli, Yann Bassaglia
    The Pax gene family: Highlights from cephalopods Sandra Navet, Auxane Buresi, Sébastien Baratte, Aude Andouche, Laure Bonnaud-Ponticelli, Yann Bassaglia To cite this version: Sandra Navet, Auxane Buresi, Sébastien Baratte, Aude Andouche, Laure Bonnaud-Ponticelli, et al.. The Pax gene family: Highlights from cephalopods. PLoS ONE, Public Library of Science, 2017, 12 (3), pp.e0172719. 10.1371/journal.pone.0172719. hal-01921138 HAL Id: hal-01921138 https://hal.archives-ouvertes.fr/hal-01921138 Submitted on 13 Nov 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Distributed under a Creative Commons Attribution| 4.0 International License RESEARCH ARTICLE The Pax gene family: Highlights from cephalopods Sandra Navet1☯, Auxane Buresi1☯, SeÂbastien Baratte1,2, Aude Andouche1, Laure Bonnaud-Ponticelli1, Yann Bassaglia1,3* 1 UMR BOREA MNHN/CNRS7208/IRD207/UPMC/UCN/UA, MuseÂum National d'Histoire Naturelle, Sorbonne UniversiteÂs, Paris, France, 2 Univ. Paris Sorbonne-ESPE, Sorbonne UniversiteÂs, Paris, France, 3 Univ. Paris Est CreÂteil-Val de Marne, CreÂteil, France ☯ These authors contributed equally to this work. * [email protected] a1111111111 a1111111111 a1111111111 a1111111111 Abstract a1111111111 Pax genes play important roles in Metazoan development. Their evolution has been exten- sively studied but Lophotrochozoa are usually omitted.
    [Show full text]
  • Interpreting Amphioxus, and Thoughts on Ancestral Chordate Mouths and Brains THURSTON LACALLI*
    Int. J. Dev. Biol. 61: 649-654 (2017) doi: 10.1387/ijdb.170105tl www.intjdevbiol.com Interpreting amphioxus, and thoughts on ancestral chordate mouths and brains THURSTON LACALLI* Biology Department, University of Victoria, Victoria, Canada ABSTRACT Amphioxus is increasingly important as a model for ancestral chordates. Nevertheless, it is secondarily modified in various ways, especially in the larva, whose small size has resulted in a rescaling and repositioning of structures. This is especially pronounced in the head region, where the mouth opens asymmetrically on the left side, leading to speculation that the mouth is sec- ondarily derived, e.g. from a gill slit, and is hence not homologous with mouths in other animals. The available evidence does not, in the author’s view, support this interpretation. A second issue is raised concerning the identity and function of the midbrain homolog, whose extent depends on whether greater weight is given to dorsal landmarks in the nerve cord or ventral ones. The presence of two sets of dorsal photoreceptors, the lamellar body and Joseph cells, functionally links the region they occupy to the vertebrate midbrain. The midbrain is currently suggested to be the brain region in which primary consciousness emerged during early vertebrate evolution, so the origin of its constituent cells is of special interest. Possible amphioxus homologs include the anterior-most group of dorsal bipolar cells (ADBs), which are apico-basally inverted (i.e. synapse-bearing neurites arise from the apical cell compartment) in the same fashion as cortical neurons in vertebrates. This may have been a crucial innovation for chordates, responsible for both improved sensory process- ing and, eventually, consciousness.
    [Show full text]
  • Gastropoda: Turbinellidae)
    Ruthenica, 200 I, II (2): 81-136. ©Ruthenica, 2001 A revision of the Recent species of Exilia, formerly Benthovoluta (Gastropoda: Turbinellidae) I 2 3 Yuri I. KANTOR , Philippe BOUCHET , Anton OLEINIK 1 A.N. Severtzov Institute of Problems of Evolution of the Russian Academy of Sciences, Leninski prosp. 33, Moscow 117071, RUSSIA; 2 Museum national d'Histoire naturelle, 55, Rue BufJon, 75005 Paris, FRANCE; 3 Department of Geography & Geology Florida Atlantic University, 777 Glades Rd, Physical Sciences Building, PS 336, Boca Raton FL 33431-0991, USA ABSTRACT. The range of shell characters (overall established among some of these nominal taxa. shape, sculpture, columellar plaits, protoconchs) Schematically, Exilia Conrad, 1860, Palaeorhaphis exhibited by fossil and Recent species placed in Stewart, 1927, and Graphidula Stephenson, 1941 Exilia Conrad, 1860, Mitraefusus Bellardi, 1873, are currently used as valid genera for Late Creta­ Mesorhytis Meek, 1876, Surculina Dall, 1908, Phe­ ceous to Neogene fossils; and Surculina Dall, 1908 nacoptygma Dall, 1918, Palaeorhaphis Stewart, 1927, and Benthovoluta Kuroda et Habe, 1950 are cur­ Zexilia Finlay, 1926, Graphidula Stephenson, 1941, rently used as valid genera for Recent deep-water Benthovoluta Kuroda et Habe, 1950, and Chatha­ species from middle to low latitudes. Each of these midia Dell, 1956 and the anatomy of the Recent nominal taxa has had a complex history of family species precludes separation of more than one genus. allocation, which has not facilitated comparisons Consequently all of these nominal genera are sy­ on a broader scale. Exilia and Benthovoluta are the nonymised with Exilia, with a stratigraphical range genera best known in the fossil and Recent litera­ from Late Cretaceous to Recent.
    [Show full text]
  • Radula of Trajct1ut Ctcap11lcana ( Pilsbry and Lowe) N Eoteron Ariel
    THE GENUS TRAJANA (MOLLUSCA: GASTROPODA) IN THE NEW WORLD E:t\IILY II. VOKES TULANE UNIVERSITY CONTENTS I. ABSTRACT __ - 75 II. INTRODUCTION 75 III. ACKNOWLEDGMENTS 77 IV. SYSTEMATIC DESCRIPTIONS 77 V. LOCALITY DATA _ 83 VI. LITERATURE CITED (8" ) ILLUSTRATIONS TEXT FIGURE 1. Radula of Trajct1Ut ctcap11lcana ( Pilsbry and Lowe) 76 TEXT FIGUEE 2. N eoteron ariel Pilsbry and Lowe 76 PLATE 1 _ 81 I. ABSTRACT off the coast of western Mexico. All species The nassarioid gastropod genus T1'ajanct are treated systematically. s.s. includes those species with a closed siphonal canal and a circular aperture, sur­ II. INTRODUCTION rounded by a raised p eristome. There are Those gastropods possessing a short, but four species in the fossil record of the slightly recurved, closed siphonal canal, a New World, occurring in the upper Mio­ circular aperture surrounded by a raised cene of North Carolina, Florida, Mexico, peristome, and a single terminal varix have and Peru, and the Pliocene of Ecuador. One presented a problem to writers for many of these four is a new species: T. ve1'ctcru­ years. Dall ( 1910, p. 32-33) suggested that zana E. H . Vokes, from the upper Miocene they be referred to the genus Hindsict A. Agueguexquite Formation of Mexico, and Adams, 1851, which was a troubled group represents the first record of the genus in from the start. Dell ( 1967, p. 309-310) the "Tertiary Caribbean Province," linking has summarized the problem nicely, stating: the eastern United States and the western "The name Hindsia had an uncertain intro­ South American occurrences.
    [Show full text]
  • Brief Glossary and Bibliography of Mollusks
    A Brief Glossary of Molluscan Terms Compiled by Bruce Neville Bivalve. A member of the second most speciose class of Mollusca, generally bearing a shell of two valves, left and right, and lacking a radula. Commonly called clams, mussels, oysters, scallops, cockles, shipworms, etc. Formerly called pelecypods (class Pelecypoda). Cephalopoda. The third dominant class of Mollusca, generally without a true shell, though various internal hard structures may be present, highly specialized anatomically for mobility. Commonly called octopuses, squids, cuttles, nautiluses. Columella. The axis, real or imaginary, around and along which a gastropod shell grows. Dextral. Right-handed, with the aperture on the right when the spire is at the top. Most gastropods are dextral. Gastropod. A member of the largest class of Mollusca, often bearing a shell of one valve and an operculum. Commonly called snails, slugs, limpets, conchs, whelks, sea hares, nudibranchs, etc. Mantle. The organ that secretes the shell. Mollusk (or mollusc). A member of the second largest phylum of animals, generally with a non-segmented body divided into head, foot, and visceral regions; often bearing a shell secreted by a mantle; and having a radula. Operculum. A horny or calcareous pad that partially or completely closes the aperture of some gastropodsl. Periostracum. The proteinaceous layer covering the exterior of some mollusk shells. Protoconch. The larval shell of the veliger, often remains as the tip of the adult shell. Also called prodissoconch in bivlavles. Radula. A ribbon of teeth, unique to mollusks, used to procure food. Sinistral. Left-handed, with the aperture on the left when the spire is at the top.
    [Show full text]
  • Pleistocene Molluscs from the Namaqualand Coast
    ANNALS OF THE SOUTH AFRICAN MUSEUM ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM Volume 52 Band July 1969 Julie Part 9 Dee! PLEISTOCENE MOLLUSCS FROM THE NAMAQUALAND COAST By A.J.CARRINGTON & B.F.KENSLEY are issued in parts at irregular intervals as material becomes available Obtainable from the South African Museum, P.O. Box 61, Cape Town word uitgegee in dele opongereelde tye na beskikbaarheid van stof OUT OF PRINT/UIT nRUK I, 2(1, 3, 5, 7-8), 3(1-2, 5, t.-p.i.), 5(2, 5, 7-9), 6(1, t.-p.i.), 7(1, 3), 8, 9(1-2), 10(1-3), 11(1-2, 7, t.-p.i.), 21, 24(2), 27, 31(1-3), 38, 44(4)· Price of this part/Prys van hierdie deel Rg.oo Trustees of the South African Museum © 1969 Printed in South Africa by In Suid-Afrika gedruk deur The Rustica Press, Pty., Ltd. Die Rustica-pers, Edms., Bpk. Court Road, Wynberg, Cape Courtweg, Wynberg, Kaap By A. ]. CARRINGTON & B. F. KENSLEY South African Museum, Cape Town (With plates 18 to 29 and I I figures) PAGE Introduction 189 Succession 190 Systematic discussion. 191 Acknowledgements 222 Summary. 222 References 223 INTRODUCTION In the course of an examination of the Tertiary to Recent sediments of the Namaqualand coast, being carried out by one of the authors (A.].C.), a collection of fossil molluscs was assembled from the Pleistocene horizons encountered in the area. The purpose of this paper is to introduce and describe some twenty species from this collection, including forms new to the South Mrican palaeontological literature.
    [Show full text]
  • Mollusca, Archaeogastropoda) from the Northeastern Pacific
    Zoologica Scripta, Vol. 25, No. 1, pp. 35-49, 1996 Pergamon Elsevier Science Ltd © 1996 The Norwegian Academy of Science and Letters Printed in Great Britain. All rights reserved 0300-3256(95)00015-1 0300-3256/96 $ 15.00 + 0.00 Anatomy and systematics of bathyphytophilid limpets (Mollusca, Archaeogastropoda) from the northeastern Pacific GERHARD HASZPRUNAR and JAMES H. McLEAN Accepted 28 September 1995 Haszprunar, G. & McLean, J. H. 1995. Anatomy and systematics of bathyphytophilid limpets (Mollusca, Archaeogastropoda) from the northeastern Pacific.—Zool. Scr. 25: 35^9. Bathyphytophilus diegensis sp. n. is described on basis of shell and radula characters. The radula of another species of Bathyphytophilus is illustrated, but the species is not described since the shell is unknown. Both species feed on detached blades of the surfgrass Phyllospadix carried by turbidity currents into continental slope depths in the San Diego Trough. The anatomy of B. diegensis was investigated by means of semithin serial sectioning and graphic reconstruction. The shell is limpet­ like; the protoconch resembles that of pseudococculinids and other lepetelloids. The radula is a distinctive, highly modified rhipidoglossate type with close similarities to the lepetellid radula. The anatomy falls well into the lepetelloid bauplan and is in general similar to that of Pseudococculini- dae and Pyropeltidae. Apomorphic features are the presence of gill-leaflets at both sides of the pallial roof (shared with certain pseudococculinids), the lack of jaws, and in particular many enigmatic pouches (bacterial chambers?) which open into the posterior oesophagus. Autapomor- phic characters of shell, radula and anatomy confirm the placement of Bathyphytophilus (with Aenigmabonus) in a distinct family, Bathyphytophilidae Moskalev, 1978.
    [Show full text]
  • Macroscopic Anatomy of the Nasal Cavity and Paranasal Sinuses of the Domestic Pig (Sus Scrofa Domestica) Daniel John Hillmann Iowa State University
    Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1971 Macroscopic anatomy of the nasal cavity and paranasal sinuses of the domestic pig (Sus scrofa domestica) Daniel John Hillmann Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Animal Structures Commons, and the Veterinary Anatomy Commons Recommended Citation Hillmann, Daniel John, "Macroscopic anatomy of the nasal cavity and paranasal sinuses of the domestic pig (Sus scrofa domestica)" (1971). Retrospective Theses and Dissertations. 4460. https://lib.dr.iastate.edu/rtd/4460 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. 72-5208 HILLMANN, Daniel John, 1938- MACROSCOPIC ANATOMY OF THE NASAL CAVITY AND PARANASAL SINUSES OF THE DOMESTIC PIG (SUS SCROFA DOMESTICA). Iowa State University, Ph.D., 1971 Anatomy I University Microfilms, A XEROX Company, Ann Arbor. Michigan I , THIS DISSERTATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED Macroscopic anatomy of the nasal cavity and paranasal sinuses of the domestic pig (Sus scrofa domestica) by Daniel John Hillmann A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subject: Veterinary Anatomy Approved: Signature was redacted for privacy. h Charge of -^lajoï^ Wor Signature was redacted for privacy. For/the Major Department For the Graduate College Iowa State University Ames/ Iowa 19 71 PLEASE NOTE: Some Pages have indistinct print.
    [Show full text]
  • Deep-Water Buccinidae (Gastropoda: Neogastropoda) from Sunken Wood, Vents and Seeps: Molecular Phylogeny and Taxonomy Yu.I
    Deep-water Buccinidae (Gastropoda: Neogastropoda) from sunken wood, vents and seeps: molecular phylogeny and taxonomy Yu.I. Kantor, N. Puillandre, K. Fraussen, A.E. Fedosov, P. Bouchet To cite this version: Yu.I. Kantor, N. Puillandre, K. Fraussen, A.E. Fedosov, P. Bouchet. Deep-water Buccinidae (Gas- tropoda: Neogastropoda) from sunken wood, vents and seeps: molecular phylogeny and taxonomy. Journal of the Marine Biological Association of the UK, Cambridge University Press (CUP), 2013, 93 (8), pp.2177-2195. 10.1017/S0025315413000672. hal-02458197 HAL Id: hal-02458197 https://hal.archives-ouvertes.fr/hal-02458197 Submitted on 28 Jan 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Deep-water Buccinidae (Gastropoda: Neogastropoda) from sunken wood, vents and seeps: Molecular phylogeny and taxonomy KANTOR YU.I.1, PUILLANDRE N.2, FRAUSSEN K.3, FEDOSOV A.E.1, BOUCHET P.2 1 A.N. Severtzov Institute of Ecology and Evolution of Russian Academy of Sciences, Leninski Prosp. 33, Moscow 119071, Russia, 2 Muséum National d’Histoire Naturelle, Departement Systematique et Evolution, UMR 7138, 43, Rue Cuvier, 75231 Paris, France, 3 Leuvensestraat 25, B–3200 Aarschot, Belgium ABSTRACT Buccinidae - like other canivorous and predatory molluscs - are generally considered to be occasional visitors or rare colonizers in deep-sea biogenic habitats.
    [Show full text]