Amphiglena terebro Rouse, 1993

Capa, Maria & Rouse, Greg W., 2007, Phylogenetic relationships within Amphiglena Claparède, 1864 (Polychaeta: Sabellidae), description of five new species from Australia, a new species from Japan, and comments on previously described species, Journal of Natural History 41 (5 - 8), pp. 327-356 : 351-352

Amphiglena terebro Rouse, 1993

( Figure 11 )

Amphiglena terebro Rouse 1993, p 5 –13, Figures 1 –45.

Material examined

Australia, New South Wales. Holotype: AM W21357 , North Bondi , New South Wales, Australia (33 ° 589 S, 151 ° 009 E), in calcareous base of Corallina officinalis , intertidal, 20 February 1992 . Paratypes: W21358–60, same locality (three specimens) . Additional material: AM W30019 , North Maroubra , 33 ° 579 S, 151 ° 159 E, coralline encrusting algae in rock platform, intertidal, 2 July 2005 (six specimens), AM W30482 , same sample (one specimen, SEM) .

Remarks

This species is very distinctive in that the thoracic uncini have a narrow breast and abdominal uncini have long handles ( Rouse 1993). In the original description the ventral basal flanges are described as coming from the posterior peristomial ring ( Rouse 1993), but study of new specimens with SEM shows that these paired, narrow lappets are located from the base of the first pinnule of the ventral radioles to the base of the crown and do not continue into the peristomium ( Figure 11B, C ). The anterior peristomial ring is conspicuous all the way around and divided ventrally by the mid-ventral incision ( Figure 11A–D ). The posterior peristomial ring, apart from the ventral incision, has a constant height all around ( Figure 11B, D ).

Figures

Figure 1. (A) One of the most parsimonious cladograms (L 95, CI 0.62, RI 0.73) from the matrix in Appendix 3. Black circles indicate synapomorphies and white circles homoplasies showing unambiguous changes only. (B) Strict consensus of five most parsimonious trees.

Figure 11. Amphiglena terebro. SEM preparation, AM W30482. (A) Anterior segments and crown, ventral view; (B) detail of anterior segments and base of crown; (C) anterior and posterior peristomial rings; (D) anterior segments and base of crown, dorsal view.