摘要:

Malmgrenia furcosetosasp.n.Harmothoe viridissp.n., Bylgides acutisetissp.n.Neopolynoe paradoxa(Storm) comb.n. andDiplaconotum paucidentatum(Eliason) comb.n. are described.Neopolynoeis a new name for the genusEupolynoeBidenkap, preoccupied by McIntosh. The genusDiplaconotumis erected forMacellicephala paucidentataEliason and is included in the subfamily Polaruschakovinae Pettibone.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00480.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

A taxonomic and morphological account of a collection of Phallodrilinae from coralline sands at Heron Island in Australia's Great Barrier Reef is given. Ten new forms are described:Jamiesoniella athecatagen. et sp.n.Phallodrilus rectisetosus heronensissubsp.n.P. geniculatussp.n.P. filithecatussp.n.P. clavatussp.n. (latter three all devoid of an alimentary canal),Bathydrilus superiovasatussp.n.Coralliodrilus atriobifidussp.n.C. oviatriatussp.n.C. parvigenitalissp.n. and the gutlessC. avisceralissp.n. Morphological notes are given forPhallodrilus albidusJamieson, 1977 andBathydrilus rohdei(Jamieson, 1977). The new meiobenthic genusJamiesoniellais characterized by having simple atria with only one pair of prostate glands, which are attached to ectal parts of atria, and by lacking spermathecae and penial setae, The genus is probably related toAktedrilusKnöllner andBacescuellaHrabě. A gutless species,Phallodrilus comorensissp.n. is described from the Comoro Islands in the Mozambique Channel (W Indian Ocean

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00481.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

In theTisbe reticulatagroup,T. aragoipossessesn=ll, whereasT. marmorataandT. reticulatadisplayn=12. In relation to other species of this genus these species are characterized by relatively small dimensions of bivalents in oocytes. The discrepancy between karyological and morphological characters is discussed.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00482.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

The following ostracods from Australian inland waters are described:Limnocythere mowbrayensisChapman, 1914,Limnocythere porphyreticasp.n.Zonocypretta kalimnagen. et sp.n.Diacypris spinosasp.n.D. dictyotesp.n.D. phoxesp.n. The taxonomic position of each of the genera mentioned above is discussed and all the AustralianDiacyprisspecies are reviewed. Ecological data for some of these species are also provided

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00483.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

Aorella multiplexgen. et sp.n. is described and figured. The species lives amongst algae and phanerogams on reef flats in Fiji. The species cannot readily be assigned to any known genus of Aoridae (sensu Myers 1981), and a new genus is here erected for its inclusion.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00484.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

In the gastropod, scaphopod, lamellibranch, and cephalopod gastrulae a thickened portion of the posttrochal region is referred to as the embryonic shell field. It invaginates and gives rise to the shell gland. In species with an at least temporarily external shell, the shell gland evaginates and again forms a shell field. In lamellibranchs, the shell field grows into two halves connected by the ligament‐secreting isthmus. In polyplacophorans plate fields are produced without invagination. Slugs and endocochleate cephalopods overgrow the embryonic shell field to form an internal shell sac. The calcified part of the shell is secreted by the flattened central region. The periostracum has its origin in the permanently thickened peripheral region of the shell field. In many forms, this region is depressed in a periostracal groove. If the shell is external, the central region of flattened cells, the mantle roof, along with the two or three marginal folds of the free mantle edge and, in species with internal shell, the shell sac are parts of the mantle. The shell field descends from the first somatoblasts. Either of 2 d or 2 c alone is able to form the shell field. There are arguments that the formation of the embryonic shell field is not autonomic, but induced by the entoderm during a period of contact. The shell gland and the shell field grow by mitotic cell divisions. Cells secreting organic material are highly prismatic, have a well developed ergastoplasm and large dictyosornes, and contain much peroxidase. The secretion of calcium manifests itself in very flat cells, rich in alkaline phosphatase and glycogen. The shell gland and the rosette of ectocochleate conchifera together are homologous to the proximal part of the shell sac in slugs and endocochleate cephalopod

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1981.tb00485.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY