RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

A large testate protist, Gromia sphaerica sp. nov. (Order Filosea), from the bathyal Arabian Sea

Auteur(s) / Author(s)

GOODAY A. J. (1) ; BOWSER S. S. (2 3) ; BETT B. J. (1) ; SMITH C. R. (4) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Southampton Oceanography Centre, Empress Dock, European Way, Southampton SO14 3ZH, ROYAUME-UNI
(2) Wadsworth Center, New York State Department of Health, P.O. Box 509, Albany, NY 12201-0509, ETATS-UNIS
(3) Department of Biomedical Sciences, The University of Albany, State University of New York, Albany, NY 12222, ETATS-UNIS
(4) Department of Oceanography, University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, ETATS-UNIS

Résumé / Abstract

The deep ocean provides a habitat for several large testate protistan taxa, e.g., xenophyophores and komokiaceans. However, testate amoebae (orders Lobosea and Filosea) have never been reliably reported from below 270 m depth. Here we describe large spherical protists, up to almost 40 mm diameter, recovered in box core, multicore, and epibenthic sledge samples taken on the continental slope off Oman (NW Arabian Sea) during RRS Discovery Cruise 211. Specimens consist of an organic envelope, with numerous tiny apertures, enclosing a mass of fine waste pellets (stercomata). On the basis of its wall ultrastructure (revealed by high-voltage transmission electron microscopy), this organism is identified as a member of the filosean genus Gromia. It is described herein as Gromia sphaerica sp. nov. The wall is layered and includes the honeycomb membrane', a structure that is unique to this genus. The new species is the first gromiid to be reported from the deep sea. It lives between about 1200 and 1630 m below the main oxygen minimum zone, in an area where bottom-water oxygen concentrations are around 0.47 ml l-1. The new gromiid species is clearly visible in bottom photographs taken at 1273 m (2.7 individuals m-2), 1318 m (2.7 indiv. m-2), 1624 m (17.3 indiv. m-2) and 1633 m (76.5 indiv. m-2). They lie partly embedded in the seafloor and are sometimes grouped in twos and threes. Specimens are typically surrounded by an apron of lighter-coloured sediment, possibly resulting from their feeding activities. Where they lie in very close proximity, the apron around one specimen typically obscures adjacent tests.

Revue / Journal Title

Deep-sea research. Part 2. Topical studies in oceanography    ISSN  0967-0645 

Source / Source

2000, vol. 47, no 1-2 (378 p.)  (1 p.3/4), pp. 55-73

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1993) (Revue)

Mots-clés anglais / English Keywords

Taxonomy

;

Diagnosis (taxonomy)

;

Morphology

;

New species

;

Benthic organism

;

Microfauna

;

Ultrastructure

;

Transmission electron microscopy

;

Deep water

;

Bathyal zone

;

Arabian Sea

;

Fauna

;

Indian Ocean

;

Marine environment

;

Protozoa

;

Mots-clés français / French Keywords

Systématique

;

Diagnose

;

Morphologie

;

Espèce nouvelle

;

Organisme benthique

;

Microfaune

;

Ultrastructure

;

Microscopie électronique transmission

;

Eau profonde

;

Zone bathyale

;

Mer d'Oman

;

Gromia sphaerica n. sp.

;

Faune

;

Océan Indien

;

Milieu marin

;

Protozoa

;

Filosea

;

Mots-clés espagnols / Spanish Keywords

Sistemática

;

Diagnosis

;

Morfología

;

Especie nueva

;

Organismo bénthico

;

Microfauna

;

Ultraestructura

;

Microscopía electrónica transmisión

;

Agua profunda

;

Zona batial

;

Mar de Oman

;

Fauna

;

Océano Indico

;

Medio marino

;

Protozoa

;

Localisation / Location

INIST-CNRS, Cote INIST : 7679 A2, 35400008141716.0030

Nº notice refdoc (ud4) : 1248817



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas