Amphiglena maiteae, 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-FFCD-FFE2-FE4D-EBC62981318D |
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treatment provided by |
Felipe |
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scientific name |
Amphiglena maiteae |
| status |
sp. nov. |
Amphiglena maiteae View in CoL sp. nov.
( Figures 4I, J View Figure 4 , 8 View Figure 8 )
Material studied
Australia, New South Wales. Holotype: AM W30510 , Sand Point , south of Lennox Head, New South Wales, Australia (28 ° 519 S, 153 ° 369300 E), high energy rock platform, scrapings from rocks and boulders, intertidal, 1 March 1992 . Paratypes: AM W25995 , same sample (29 specimens); AM W30400 , same sample (one specimen, SEM) .
Description
Holotype 2 mm long, branchial crown 0.5 mm long. Eight thoracic and 16 abdominal chaetigers. Four radioles on each side of the branchial crown. Palmate membrane and radiolar flanges absent ( Figure 8B, C View Figure 8 ). Radioles with two longitudinal rows of pinnules alternating along the length, in the distal half of the radiole they are longer than in the proximal half ( Figure 8A View Figure 8 ). Tip of radioles not longer than the distal pinnules. Radiolar skeleton with two rows of cells. Ventral basal flanges from the proximal pinnule of the ventralmost radiole, continuing and fused to the posterior peristomial ring, with a transversal incision ( Figure 8B View Figure 8 ). Dorsal lips with elongate, ciliated, dorsal radiolar appendages of about one-quarter the length of the branchial crown, not longer than the length of the proximal pinnule in the ventralmost radiole; with no skeleton. Dorsal pinnular appendages absent. Ventral lips absent. Anterior peristomial ring narrow, only visible over the posterior peristomial ring on both margins of the faecal groove ( Figure 8C View Figure 8 ). Posterior peristomial ring with a mid-ventral incision, where the ventral basal flanges are attached; collar absent ( Figure 8B View Figure 8 ). Peristomial eyes as two brown circular spots. Thorax longer than wide with quadrangular ventral similarly sized shields. Three chaetae on the first chaetiger, superior chaetae narrowly hooded, inferior broadly hooded ( Figure 8D View Figure 8 ). Rest of chaetigers with one superior thoracic notochaeta broadly hooded, broader than collar chaetae, and up to three inferior paleate thoracic notochaetae, in a single row ( Figure 8E View Figure 8 ). Second to last thoracic chaetiger with up to six thoracic uncini per fascicle, increasing in size from the ventral to the lateral margin of torus, with numerous rows of small, similarly sized teeth, above the main fang, arranged in the upper half of the main fang ( Figure 8F View Figure 8 ); breast well developed, handles medium to short ( Figure 4I View Figure 4 ). Companion chaetae geniculated, with straight shaft and elongate mucro with several teeth of the same size in the basis ( Figure 8F View Figure 8 ). Abdominal chaetigers with up to three broadly hooded abdominal neurochaetae in each fascicle ( Figure 8G View Figure 8 ) and up to four uncini per torus with several rows of small teeth of similar size above the main fang ( Figure 8H View Figure 8 ), breast well developed, short-sized handle ( Figure 4J View Figure 4 ). Pygidial eyes as irregular brown spots in both lateral margins of pygidium. Statocysts not seen. Tube unknown. Eggs observed in the second and third abdominal chaetiger.
Variation
Some specimens have seven thoracic and from nine to 19 abdominal chaetigers. The number of radioles seems not to vary among the specimens. The number of thoracic and abdominal chaetae are as the holotype. Eggs begin normally in the second abdominal chaetiger but they can begin at up to the sixth abdominal chaetiger.
Remarks
Amphiglena maiteae sp. nov. is the only species we erect in this study that is not monophyletic in our cladistic analysis. However, as discussed above, monophyly is not a requisite for the erection of species taxa. Amphiglena maiteae sp. nov. (from Australia) is most similar to A. nishii sp. nov. (from Japan) but clearly differs from it in the length of the uncini handles and number of radioles. In trees in which A. maiteae sp. nov. is monophyletic (in three of the five shortest trees) the species is supported by the even height of the anterior peristomial ring, though this is seen also in A. gracilis sp. nov., A. jimenezi , A. pacifica , and A. terebro .
Etymology
It is our pleasure to name this species for María Teresa Aguado, a good friend and in recognition of her valuable contributions to polychaete taxonomy.
| 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.