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Early Jurassic leech cocoons from eastern Australia

Jansson, Ida-Maria; McLoughlin, Stephen and Vajda, Vivi LU (2008) In Alcheringa 32(3). p.285-296
Abstract (Swedish)
Abstract in Undetermined

A small assemblage of clitellate annelid cocoons (egg cases) is described from the Early Jurassic Marburg Subgroup, Clarence-Moreton Basin, eastern Australia. Two complete specimens are preserved on bedding planes, and numerous fragments were recovered from organic residues prepared for mesofossil analysis. The complete specimens are assigned to Burejospermum Krassilov emend. Manum, Bose Sawyer, 1991, having a well-developed mesh-like hapsine and a solid layer of underlying alytine. The fragments include a form assigned to Dictyothylakos Horst, 1954 emend. Manum, Bose Sawyer, 1991 having a mesh-like hapsine but lacking an alytine layer. The cocoons are preserved in floodbasin facies represented by... (More)
Abstract in Undetermined

A small assemblage of clitellate annelid cocoons (egg cases) is described from the Early Jurassic Marburg Subgroup, Clarence-Moreton Basin, eastern Australia. Two complete specimens are preserved on bedding planes, and numerous fragments were recovered from organic residues prepared for mesofossil analysis. The complete specimens are assigned to Burejospermum Krassilov emend. Manum, Bose Sawyer, 1991, having a well-developed mesh-like hapsine and a solid layer of underlying alytine. The fragments include a form assigned to Dictyothylakos Horst, 1954 emend. Manum, Bose Sawyer, 1991 having a mesh-like hapsine but lacking an alytine layer. The cocoons are preserved in floodbasin facies represented by leaf-rich, dark shales. Palynological data indicate a Pliensbachian to earliest Toarcian age for the assemblage. Similarities between the new specimens, congeneric material from the Triassic to Neogene of other continents, and modern egg cases highlight the long-term morphological conservatism of clitellate cocoons. The new material extends the distribution of such fossils, which generally have a poor macrofossil record. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Australia, Early Jurassic, Clitellata, Burejospermum, Dictyothylakos, palaeoenvironment
in
Alcheringa
volume
32
issue
3
pages
285 - 296
publisher
Taylor & Francis
external identifiers
  • wos:000258403800004
  • scopus:43849111963
ISSN
0311-5518
DOI
10.1080/03115510802096226
language
English
LU publication?
yes
id
7674c0e7-d8ba-4012-9ef8-2d6e44cd9ac9 (old id 939636)
date added to LUP
2008-01-23 15:29:39
date last changed
2017-01-08 03:59:58
@article{7674c0e7-d8ba-4012-9ef8-2d6e44cd9ac9,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
A small assemblage of clitellate annelid cocoons (egg cases) is described from the Early Jurassic Marburg Subgroup, Clarence-Moreton Basin, eastern Australia. Two complete specimens are preserved on bedding planes, and numerous fragments were recovered from organic residues prepared for mesofossil analysis. The complete specimens are assigned to Burejospermum Krassilov emend. Manum, Bose Sawyer, 1991, having a well-developed mesh-like hapsine and a solid layer of underlying alytine. The fragments include a form assigned to Dictyothylakos Horst, 1954 emend. Manum, Bose Sawyer, 1991 having a mesh-like hapsine but lacking an alytine layer. The cocoons are preserved in floodbasin facies represented by leaf-rich, dark shales. Palynological data indicate a Pliensbachian to earliest Toarcian age for the assemblage. Similarities between the new specimens, congeneric material from the Triassic to Neogene of other continents, and modern egg cases highlight the long-term morphological conservatism of clitellate cocoons. The new material extends the distribution of such fossils, which generally have a poor macrofossil record.},
  author       = {Jansson, Ida-Maria and McLoughlin, Stephen and Vajda, Vivi},
  issn         = {0311-5518},
  keyword      = {Australia,Early Jurassic,Clitellata,Burejospermum,Dictyothylakos,palaeoenvironment},
  language     = {eng},
  number       = {3},
  pages        = {285--296},
  publisher    = {Taylor & Francis},
  series       = {Alcheringa},
  title        = {Early Jurassic leech cocoons from eastern Australia},
  url          = {http://dx.doi.org/10.1080/03115510802096226},
  volume       = {32},
  year         = {2008},
}