Amphiglena magna, Capa & Rouse, 2007
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publication ID |
https://doi.org/ 10.1080/00222930701194938 |
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persistent identifier |
https://treatment.plazi.org/id/9C3F6324-FFCB-FFE1-FE73-EA0729EB3573 |
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treatment provided by |
Felipe |
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scientific name |
Amphiglena magna |
| status |
sp. nov. |
Amphiglena magna View in CoL sp. nov.
( Figures 4G, H View Figure 4 , 7 View Figure 7 )
Material studied
Australia, Victoria. Holotype: MV F109494 , Cheviot Beach, Point Nepean , 38 ° 129 S, 144 ° 409 E, 3.5–5 m, 31 March 1998 . Paratypes: MV F91001 View Materials , same locality (46 specimens) , AM W30486, same locality (one specimen, SEM) . Additional material: MV F90998 View Materials , Off Eagles Nest, Bunurong , 38 ° 409 S, 145 ° 399 E, 1 April 1997 (13 specimens) .
Description
Holotype 5 mm long (branchial crown 1.5 mm). Eight thoracic and 21 abdominal chaetigers. Seven radioles on each side of the branchial crown. Radioles with numerous pinnules in two rows, alternating along length, similar in size all along; tip of radioles as long as distal pinnules ( Figure 7A View Figure 7 ). Palmate membrane inconspicuous and radiolar flanges absent ( Figure 7B, C View Figure 7 ). Radiolar skeleton with two rows of cells. Short ventral basal flanges restricted to base of crown, not continuing posteriorly ( Figure 7B View Figure 7 ). Dorsal lips with elongate, ciliated, dorsal radiolar appendages of about one-quarter the length of branchial crown. Dorsal pinnular appendages absent. Ventral lips absent. Anterior peristomial ring indistinguishable ( Figure 7A–C View Figure 7 ). Posterior peristomial ring with a mid-ventral incision and ventral margins prolonged anteriorly on both sides of incision; collar absent. Peristomial eyes as two brownish spots. Thorax longer than wide with quadrangular ventral shields similar, not in contact with the thoracic tori. Two narrowly hooded superior and three broadly hooded notochaetae on first chaetiger ( Figure 7D View Figure 7 ). Other thoracic chaetigers with one or two superior broadly hooded notochaetae and three paleate inferior thoracic notochaetae ( Figure 7F View Figure 7 ). Up to 10 thoracic uncini per torus, increasing in size from the ventral side to the lateral margin of torus, with numerous rows of small teeth of similar size above the main fang, arranged in upper half of uncini ( Figure 7E, F View Figure 7 ); breast well developed, reaching the level of tip of the main fang, handles medium in length ( Figure 4G View Figure 4 ). Companion chaetae geniculated, with straight shaft and elongate mucro with several basal teeth of similar size ( Figure 7E, F View Figure 7 ). Abdominal chaetigers with two broadly hooded abdominal neurochaetae per fascicle ( Figure 7G View Figure 7 ) and up to eight uncini per torus, with several rows of small teeth of similar size above the main fang ( Figure 7H View Figure 7 ), breast well developed, with a convex base, short handle ( Figure 4H View Figure 4 ). Pygidial eyes as a brown spot on each side of pygidium. Statocysts not seen. Tube unknown.
Variation
Amphiglena magna sp. nov. is generally larger than other species of Amphiglena , except A. pacifica which can measure up to 20 mm ( Rzhavsky 1995), but small specimens have also been found, measuring 2 mm long and with 15 abdominal chaetigers. Some specimens show slight variation in the number of radioles in that some have six pairs with up to 20 pinnules along radioles. Some specimens have eggs in the anterior abdominal chaetigers.
Remarks
The specimens of A. magna sp. nov. are large compared to other Amphiglena . Additionally, a distinguishing feature is the shape and length of the ventral basal flanges that terminate at the junction of crown and thorax, though this is seen in A. gracilis sp. nov., A. terebro , and A. mediterranea . However, these species are distinguishable from A. magna sp. nov. in having fewer radioles, the pinnules along radioles not being similar in length, and having larger dorsal radiolar appendages.
Etymology
The name of this species refers to its size, one of the largest in the genus.
| MV |
University of Montana Museum |
| AM |
Australian Museum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.