Amphiglena bondi, Capa & Rouse, 2007

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 : 339-341

publication ID	https://doi.org/ 10.1080/00222930701194938
persistent identifier	https://treatment.plazi.org/id/9C3F6324-FFD7-FFE5-FE7A-ECE92E703394
treatment provided by	Felipe
scientific name	Amphiglena bondi
status	sp. nov.

Treatment

Amphiglena bondi View in CoL sp. nov.

( Figures 4C, D View Figure 4 , 5 View Figure 5 )

Material studied

Australia, New South Wales. Holotype: SAM E3636 View Materials , scrapings of intertidal algal mat, largely made up of red calcareous Amphiroa sp. near Mermaid Rock, North Bondi Rocks, Sydney , 33 ° 549 S, 151 ° 179 E, intertidal, June 2001 . Paratypes: SAM E3637 View Materials , same locality, October 2001 (three specimens); AM W30480 , same locality (one specimen, SEM) .

Description

Holotype 2 mm long, branchial crown 0.8 mm long. Eight thoracic and 22 abdominal chaetigers. Six radioles on each side of the branchial crown. Palmate membrane and radiolar flanges absent ( Figure 5B, C View Figure 5 ). Radioles with two longitudinal rows of 10–15 pinnules similar in length along the radiole. Tip of radioles longer than distal pinnules ( Figure 5A View Figure 5 ). Radiolar skeleton with two rows of cells. Ventral basal flanges from proximal pinnule of ventralmost radiole to posterior peristomial ring ( Figure 5B View Figure 5 ). Dorsal lips with elongate, ciliated, dorsal radiolar appendages of about one-sixth the length of the branchial crown, not longer than length of proximal pinnule in ventralmost radiole ( Figure 5C View Figure 5 ); with no skeleton. Dorsal pinnular appendages absent. Ventral lips absent. Anterior peristomial ring narrow, only visible ventrally ( Figure 5B, C View Figure 5 ). Posterior peristomial ring with midventral incision, where ventral basal flanges attach; collar absent ( Figure 5B View Figure 5 ). Peristomial eyes present, two brown and circular spots. Thorax longer than wide with quadrangular ventral shields similar in size. Four chaetae on first chaetiger, superior chaetae narrowly hooded, inferior broadly hooded ( Figure 5B, D View Figure 5 ). Rest of chaetigers with three superior thoracic broadly hooded notochaetae, broader than collar chaetae, and up to four paleate inferior thoracic notochaetae, in single row ( Figure 5D View Figure 5 ). Second to eighth thoracic chaetiger with up to eight thoracic uncini per fascicle, increasing in size from ventral to lateral margin of torus ( Figure 5D, E View Figure 5 ), with about four to five rows of small, similarly sized teeth, above main fang, arranged in upper half of main fang; breast well developed, handles medium in length ( Figure 4A View Figure 4 ). Companion chaetae geniculated, with straight shaft and elongate mucro with several basal teeth of same size ( Figure 5D, E View Figure 5 ). Abdominal chaetigers with up to three broadly hooded abdominal neurochaetae in each fascicle ( Figure 5F View Figure 5 ) and up to six uncini per torus with several rows of small teeth of similar size above main fang, breast well developed, short handle ( Figures 4B View Figure 4 , 5F, G View Figure 5 ). Pygidial eyes present, pair of irregular brown spots on lateral margins of pygidium. Statocysts not seen. Tube clear mucous sheath with some sediment. Eggs observed from the third to the tenth abdominal chaetiger.

Variation

Some specimens can have seven thoracic and from nine to 19 abdominal chaetigers. The number of radioles does not vary among the specimens. The number of thoracic and abdominal uncini may differ from holotype. Eggs normally begin in the second abdominal chaetiger.

Remarks

Based on the results of the cladistic analysis, the presence of eggs from the second abdominal chaetiger is an apomorphy for A. bondi sp. nov., though this is also seen in A. jimenezi , A. lindae , and some A. maiteae sp. nov. and so may not remain an apomorphy if the Amphiglena tree topology changes. Amphiglena bondi sp. nov. is also characterized by a unique combination of characters: the presence of six pairs of radioles, small dorsal radiolar appendages, thoracic uncini with a well-developed breast, medium in width and with medium or short handles. The most similar species are A. magna sp. nov. and A. lenae sp. nov. Amphiglena bondi sp. nov. is distinguished from A. magna sp. nov. by the location of the eggs, in that they are from the first abdominal segment in A. magna sp. nov. Also the ventral basal flanges continue to the peristomium in A. bondi sp. nov. while in A. magna sp. nov. they are folded in the junction of crown and thorax. Amphiglena lenae sp. nov is distinguished from A. bondi sp. nov. by the shape of the uncinial breast, which is well developed but short and pointed.