| 000 -LEADER |
|---|
| fixed length control field |
01815nab a2200205 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
GSMBLIc |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
210301b ||||| |||| 00| 0 eng d |
| 041 ## - LANGUAGE CODE |
|---|
| Language code of text/sound track or separate title |
Einglish Language |
| 100 ## - MAIN ENTRY--PERSONAL NAME |
|---|
| Personal name |
Aubril, Rudy Lerosey |
| 9 (RLIN) |
7941 |
| 245 ## - TITLE STATEMENT |
|---|
| Title |
Ontogeny of Drevermannia and the origin of blindness in late devonian proetoid trilobites |
| 300 ## - PHYSICAL DESCRIPTION |
|---|
| Extent |
89-104pp. |
| Other physical details |
Illustration |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
Numerous silicified and calcareous sclerites of various sizes, recovered from the latest Famennian of Thuringia (Germany), allow the description of the first complete growth series of a blind proetoid trilobite: Drevermannia richteri. In addition, the partial ontogenetic development of Drevermannia antecurvata sp. nov. and undetermined species, Drevermannia sp. 1, are described. The proetoid anaprotaspides, associated with D. richteri, illustrate that a marked increase in larval size occurred prior to the terminal Devonian extinction event. Considering the homogeneity of larval size in older Devonian proetoids, it is interpreted as evidence that the developmental strategy of these trilobites was significantly modified. Though largely speculative, two alternative hypotheses are proposed to explain this modification. Finally, all three ontogenetic sequences show that ocular structures never develop externally in Drevermannia, but also illustrate that the development of optical nerves is not completely lost in this group. This suggests that blindness in the Drevermannia lineage followed a centripetal mode of eye reduction. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Trilobita |
| 9 (RLIN) |
7942 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Proetidae |
| 9 (RLIN) |
8844 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Ontogeny |
| 9 (RLIN) |
8845 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Famennian |
| 9 (RLIN) |
8846 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name entry element |
Palaeoecology |
| 9 (RLIN) |
8847 |
| 773 0# - HOST ITEM ENTRY |
|---|
| Host Biblionumber |
1899 |
| Host Itemnumber |
2187 |
| Place, publisher, and date of publication |
London Cambridge University Press 2006 |
| Other item identifier |
002538 |
| Title |
Geological magazine : Vol. 143 Iss. 1-6 Year. 2006 |
| International Standard Serial Number |
00167568 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Source of classification or shelving scheme |
|
| Call number suffix |
{082b} |
| Koha item type |
Article |
