Amphiglena lenae, 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 : 341-343

publication ID	https://doi.org/ 10.1080/00222930701194938
persistent identifier	https://treatment.plazi.org/id/9C3F6324-FFC9-FFE7-FE7F-EDAC2E7C344C
treatment provided by	Felipe
scientific name	Amphiglena lenae
status	sp. nov.

Treatment

Amphiglena lenae View in CoL sp. nov.

( Figures 4E, F View Figure 4 , 6 View Figure 6 )

Material studied

Australia, Western Australia. Holotype: AM W30003 , Red Bluff, Kalbarri , 27 ° 429 S, 114 ° 099 E, rocky shore, mixed coralline algae, 3–4 m, 10 January 1984 . Paratypes: AM W30004 , same sample (70 specimens); AM W30478 , AM W30479 , same sample, ( SEM). Additional material : AM W30005 , Red Bluff, Kalbarri , 27 ° 429 S, 114 ° 099 E, rocky shore, mixed brown algae, 3–4 m, 10 January 1984 (10 specimens) .

Description

Holotype with 2.5 mm body length and 1 mm branchial crown length. Eight thoracic and 15 abdominal chaetigers. Five radioles on each side of branchial crown ( Figure 6A View Figure 6 ). Palmate membrane and radiolar flanges absent ( Figure 6B, C View Figure 6 ). Radioles with two longitudinal rows of pinnules alternating along the length, similar in size except for distally ( Figure 6A View Figure 6 ); tip of radioles longer than distal pinnules. Radiolar skeleton with two rows of cells. Ventral basal flanges present as rounded lappets from the base of crown, continuing posteriorly and fused to posterior peristomial ring ( Figure 6B, C View Figure 6 ). Dorsal lips with elongate, ciliated, dorsal radiolar appendages about one-quarter length of branchial crown, not longer than proximal pinnule in ventralmost radioles; with no skeleton. Dorsal pinnular appendages absent. Ventral lips absent. Anterior peristomial ring inconspicuous ( Figure 6B, C View Figure 6 ). Posterior peristomial ring with a mid-ventral incision and margins prolonged anteriorly; collar absent. Peristomial eyes as two reddish and circular spots. Thorax longer than wide with quadrangular ventral shields similar in size. One narrowly hooded and two broadly hooded notochaetae of first thoracic chaetiger ( Figure 6D View Figure 6 ). Other thoracic chaetigers with one superior broadly hooded notochaeta and two paleate inferior thoracic notochaetae ( Figure 6D View Figure 6 ). Up to eight thoracic uncini per torus, increasing in size from the ventral side to lateral margin of torus, with numerous rows of small teeth of similar size above main fang, arranged in upper half of uncini ( Figure 6D, E View Figure 6 ); breast well developed, reaching level to tip of main fang, handles medium to short ( Figure 4C View Figure 4 ). Companion chaetae geniculated, with straight shaft and elongate mucro with several basal teeth of similar size ( Figure 6D, E View Figure 6 ). Abdominal chaetigers with two broadly hooded abdominal neurochaetae per fascicle ( Figure 6F View Figure 6 ) and up to eight uncini per torus, with several rows of small teeth of similar size above main fang, breast well developed, short handled ( Figures 4D View Figure 4 , 6G View Figure 6 ). Pygidial eyes present, pair of irregular brown spots on lateral margins of pygidium. Statocysts not seen. Tube unknown. Eggs from chaetiger one to seven, though not all of these.

Variation

A few specimens have four radioles, but most have five radioles with long tips and pinnules similar in length all along. The number of chaetae and uncini vary slightly among specimens. Some specimens lack eggs, which if present, appear from the first abdominal chaetigers for up to seven segments.

Remarks

This species is one of the apomorphic Amphiglena species and shares with A. bondi sp. nov. and A. magna sp. nov. the presence of pinnules of similar length along the radioles. It is distinguishable from other species of Amphiglena by the shape of the thoracic uncini. It is the only species with a well-developed but short breast (the space from breast to main fang is larger than the breast). There is also a character combination unique to this species in the presence of five (sometimes four) pairs of radioles with between 10 and 15 pinnules, long ventral basal flanges extending to peristomium with posterior peristomial ring extending forward ventrally on each side of the median incision and small radiolar appendages (less than one-quarter of the length of radioles).

Etymology

It is our pleasure to name this species for Dr Elnae Kupriyanova (University of Adelaide) for her work on serpulid polychaetes and on assessing their relationship with sabellids.