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The Siphonocladales sensu Egerod from Papua New Guinea and Indonesia
Leliaert, F.; Coppejans, E. (1998). The Siphonocladales sensu Egerod from Papua New Guinea and Indonesia. Biol. Jb. Dodonaea 65: 161-162
In: Biologisch Jaarboek (Dodonaea). Koninklijk Natuurwetenschappelijk Genootschap Dodonaea: Gent. ISSN 0366-0818
Also appears in:
Beeckman, T.; Caemelbeke, K. (Ed.) (1998). Populations: Natural and manipulated, symposium organized by the Royal Society of Natural Sciences Dodonaea, University of Gent, 29 October 1997. Biologisch Jaarboek (Dodonaea), 65. Koninklijk Natuurwetenschappelijk Genootschap Dodonaea: Gent. 257 pp., more
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  • Leliaert, F., more
  • Coppejans, E.
Abstract
    A morphological-taxonomical study was carried out on members of the Siphonocladales sensu Egerod (Siphonocladales-Cladophorales complex) from Papua New Guinea (PNG) and Indonesia. The Papua New Guinean specimens were collected from the Madang Province (N-coastal region of PNG) and Motupore Island (S-coastal region of PNG). The Indonesian specimens were collected during the Snellius-II oceanographic expedition in the Banda and Flores Sea (eastern part of Indonesia). 19 species where described, including species of the genera Anadyomene, Boergesenia, Boodlea, Dictyosphaeria, Microdictyon, Phyllodictyon, Struvea, Valonia and Ventricaria. Four new species were recorded for the region: Microdictyon okamurae (Banda and Flores Sea); Microdictyon palmeri, Struvea gardineri (Madang Province); and Dictyosphaeria ocellata (Motupore Island). Ultrastructural and molecular evidence show that neither the Siphonocladales nor the Cladophorales are monophyletic, and that there is no reason to seperate both orders (van den Hoek 1982, Olsen-Stojkovich 1986, Bakker et al. 1994). Life history and molecular evidence show the genera Phyllodictyon and Boodlea to be very closely related. Some authors even consider Phyllodictyon and Boollea congeneric (Egerod 1975). The question could then be asked if a morphological continuum existed between the two genera. 35 specimens of Boodlea composita, Phyllodictyon anasto- mosans were examined using classical and novel characters. Struvea ele- gans and Struvea gardineri were used as outgroups. A principal component analysis and a Mann- Witney U test were used to analyse the data. A morphological continuurn between the Boodlea composita-cluster and the Phyllodictyon anastomosans-cluster was observed from the ordination, supporting the hypothesis that both species may be conspecific. For species identification under the current classification a combination of classical characters and characters derived from this study (branching order, cellular dimensions) is recommended.
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