Amphicteis dalmatica
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Ordo: Terebellida
Familia: Ampharetidae
Genus: Amphicteis
Name
Amphicteis dalmatica Hutchings & Rainier, 1979 – Wikispecies link – Pensoft Profile
- Amphicteis dalmatica Hutchings and Rainer 1979[1]: 783–786, fig. 9 A–E.
Material examined
Type material. Australia, New South Wales, Pittwater, found in Zostera or Posidonia beds, 1–4 m deep. Holotype: AM W.8672, incomplete, 7 mm long, 2 mm wide anteriorly. Paratypes: AM W.8230, W.8242, W.8243, W.8249, W.8251, W.8252, W.8253, W.11667, W.11668, all incomplete; complete paratypes W.8243, W.8252, W.11667; W.8230 (only specimen with upper lip and buccal tentacles exposed) mounted for SEM examination.
Redescription
Types with dorsum of anterior segments speckled with pigmented spots, pigmentation decreasing posteriorly. Pigmentation still visible after decades of storage in alcohol, although paler than when originally described (compare our Fig. 5 with fig. 9 in the original description, especially the branchial pigmentation, most of which has been lost over time). Mucous tube with embedded sand and shell particles (Fig. 5A). Prostomium well developed, with a mid-dorsal trilobed process (Figs 5B, G, H, 6A–C), middle lobe as paired longitudinal glandular ridges, wider distally, T-shaped, gap between glandular ridges absent (Figs 5B, G, H, 6A–C); lateral lobes each with a cluster of eyespots basally. Nuchal organs as paired nuchal ridges, touching each other basally, V-shaped, lacking median gap; buccal tentacles smooth (Figs 5B–E, G–I, K, 6A–C, E, F). Segment I inconspicuous, barely visible laterally, in superior view (Fig. 6B, E); segment II developed ventrally and laterally, bearing paleae, covered by branchiae dorsally (Figs 5B–D, G–I, K, 6A–C, E, F). Four pairs of long and tapering branchiae, arising free from body wall in 2 transverse rows, on segments III and IV, each with 1 long and thick filament on each side, separated in left and right groups by a mid-dorsal triangular hump (Figs 5B–K, 6A–C). All branchial filaments about same size, originating from segments II–V, arising as free filaments from segments III and IV, 2 pairs on each segment, in transverse rows, as follows: on segment III, outer pair originating from segment II, inner pair originating from segment III; on segment IV, outer pair originating from segment IV, inner pair from segment V (Figs 5B–K, 6A–C, F). Segment II with ~10 short stout notopodial paleae on each side, arranged in shallow arcs, paleae distally pointed, with short filiform tip, frequently broken off; paleae remarkably small, about same size as notochaetae, but stouter (Figs 5B, C, G–I, K, 6B, E, F, 7A, B). Notopodia with capillary chaetae starting from segment III and extending through 17 chaetigers; notopodia each with a tuberculate ventral cirrus (Figs 5L, 6D, F, G, 7C–E); first 3 pairs aligned laterally to following pairs and increasing progressively in size, all 3 much shorter than those from segment VI onwards (Figs 5B, C, E–G, I, J, 6A–C, F). Neuropodial tori with uncini from segment VI, present in 14 thoracic uncinigers; tori as raised trapezoidal structures throughout, larger on thorax (Figs 5C, D, I, L, 6B, F). Continuous ventral shields present to approximately thoracic unciniger 12 (Fig. 5C, D, I, K). Elevated or modified notopodia absent. Intermediate uncinigers absent. Fifteen abdominal uncinigers with tuberculate rudimentary notopodia (Fig. 6H, J). Pinnules with tiny tuberculate dorsal neuropodial process (Fig. 6H, I). Thoracic and abdominal uncini arranged in single vertical rows with barely conspicuous subrostral process and five or six teeth in a single row over basal rounded prow; thoracic uncini with teeth progressively increasing in size until fourth, fifth (distal) tooth shorter (Figs 6K, 7F); abdominal uncini with sixth tooth, when present, much shorter than other teeth (Figs 6L, 7G, H). Pygidium with one pair of long, gently tapering anal cirri.
Distribution
New South Wales, Australia.
Remarks
Members of A. dalmatica are clearly distinct and differ from our new species in the following features. In A. dalmatica, the paleae are poorly developed, prostomial lateral lobes each have a cluster of eyespots basally, uncini have barely conspicuous subrostral process, and a distinct spotted pigmentation pattern is present on the dorsum of thoracic segments and branchiae. Members of Amphicteis hwanghaiensis sp. nov. have well-developed paleae that are twice as long as the prostomium. Uncini of A. hwanghaiensis sp. nov. have a much larger subrostral process. Furthermore, the type locality of A. dalmatica is New South Wales, Australia, in seagrass beds.
Taxon Treatment
- Wang, W; Sui, J; Li, X; Hutchings, P; Nogueira, J; 2020: A new species of the genus Amphicteis Grube, 1850 (Annelida, Ampharetidae) from the Yellow Sea, China, together with a redescription of A. dalmatica Hutchings & Rainer, 1979 ZooKeys, 988: 1-15. doi
Images
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Other References
- ↑ Hutchings P, Rainer S (1979) The polychaete fauna of Careel Bay, Pittwater, New South Wales, Australia.Journal of Natural History13: 745–796. https://doi.org/10.1080/00222937900770561
