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PHYLOGENETIC POSITION OF IBLA (CIRRIPEDIA: THORACICA) BASED ON 18S <?CTRLerr type="1" mess="Minuscule et majuscule melange" ?>rDNA SEQUENCE ANALYSIS

PHYLOGENETIC POSITION OF IBLA (CIRRIPEDIA: THORACICA) BASED ON 18S and The Iblomorpha (=Prothoracica sensu An- derson, 1994) is a suborder of cirripeds com- prising four living species of the genus Ibla. The systematic position of Ibla has been dis- cussed since it was first described by Darwin (1851), and remains problematic. A firm re- lationship could not be established between this genus and other cirripeds. Ibla exhibits several features which are re- garded primitive, and is, therefore, considered one of the most primitive thoracicans. Dar- win (1851 ) noted an affinity of Ibla with Het- erolepas. The two genera share a nonshelled capitulum with a chitinous cover, and a lack of a sharp distinction between the capitulum and the peduncle. The lack of a carina in Ibla is also considered a primary feature and not a secondary loss (Newman, 1987). Ibla ex- hibits the simplest and most primitive ar- rangement of cirri within the Lepadomorpha, all the cirri being structurally similar, while in other Lepadomorpha the first cirrus is mod- ified as a maxilliped (Newman et al., 1969). The position of the cirri at the end of the tho- rax is shared with the burrowing barnacles, the Acrothoracica (see Tomlinson, 1985). The caudal appendages are multiarticulated as http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Crustacean Biology Brill

PHYLOGENETIC POSITION OF IBLA (CIRRIPEDIA: THORACICA) BASED ON 18S <?CTRLerr type="1" mess="Minuscule et majuscule melange" ?>rDNA SEQUENCE ANALYSIS

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References (15)

Publisher
Brill
Copyright
Copyright 1998 by Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0278-0372
eISSN
1937-240X
DOI
10.1163/193724098X00160
Publisher site
See Article on Publisher Site

Abstract

and The Iblomorpha (=Prothoracica sensu An- derson, 1994) is a suborder of cirripeds com- prising four living species of the genus Ibla. The systematic position of Ibla has been dis- cussed since it was first described by Darwin (1851), and remains problematic. A firm re- lationship could not be established between this genus and other cirripeds. Ibla exhibits several features which are re- garded primitive, and is, therefore, considered one of the most primitive thoracicans. Dar- win (1851 ) noted an affinity of Ibla with Het- erolepas. The two genera share a nonshelled capitulum with a chitinous cover, and a lack of a sharp distinction between the capitulum and the peduncle. The lack of a carina in Ibla is also considered a primary feature and not a secondary loss (Newman, 1987). Ibla ex- hibits the simplest and most primitive ar- rangement of cirri within the Lepadomorpha, all the cirri being structurally similar, while in other Lepadomorpha the first cirrus is mod- ified as a maxilliped (Newman et al., 1969). The position of the cirri at the end of the tho- rax is shared with the burrowing barnacles, the Acrothoracica (see Tomlinson, 1985). The caudal appendages are multiarticulated as

Journal

Journal of Crustacean Biology – Brill

Published: Jan 1, 1998

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