Biological Invasions of Cold-Water Coastal Ecosystems - Aquatic ...

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Chapt 9C3. Polychaete Worms, page 9C3- 14 This is a dubious taxon. Originally described has having capillary setae only in notosetiger 6 and neurosetiger 7; mixed capillaries in notosetiger 7 and neurosetiger 8; hooks only in notosetigers 8-11 and neurosetigers 9-11. In contrast, Fauchald (1977) lists Barantolla as having 6 setigers with capillaries followed by 1 mixed capillaries and hooks, and then 4 more with hooks only. The present specimens are at odds with the above descrepancies. Specimen 3(1) with mixed notosetae on setiger 5; 7(2) with capillaries only in notosetigers 1-5 and neurosetigers 1-6, mixed setae in notosetiger 6 and neurosetiger 7, and hooks only thereafter in notosetigers 7-11 and neurosetigers 8-11; specimen 41(1) with capillaries only in both noto- and neurosetigers 1-6, and hooks only in both noto- and neurosetigers 7-11 (setiger with mixed setae apparently absent). Capitella capitata (Fabricius, 1780) NIW NIS 1998: Sta 7(3 specimens); Sta 9(1); Sta 15(9); Sta 41(17). Whatever Capitella capitata is, these specimens can be assigned to the stem species. But this is one the “cosmopolitan” species that can be almost anything. Abarenicola pacifica Healy & Wells 1959 NIW NIS 1998: Sta 7(1 specimen); Sta 17(3); Sta 18(9). One large specimen (Sta. 7), intact; all others are juveniles. No question concerning identity. Owenia fusiformis della Chiaje, 1841 NIW NIS 1998: Sta 7(1 specimen); Sta 41(1). Only two specimens. Have a collar as per Owenia collaris. Setae appear to have configuration found in Owenia fusiformis. Refer to recent paper on the family from IP4 (Paris). Rhynchospio glutaea (Ehlers, 1887) PWS NIS 1998: Sta 10(1 specimen); Sta 10(1). New record for Alaska. Not particularly surprising. Prionospio sp. PWS NIS 1998: Sta 18(12 specimens). Recheck. One specimen appeared to have gills on middle body segments. These are not polydorids as noted on label. Dipolydora cf. socialis (Schmarda, 1861) PWS NIS 1998: Sta 17(1 specimen). Tentative identification, but not Dipolydora socialis. Falcate spines of setiger 5 strongly falcate, with hint of flange; bristle absent. Setiger 1 postsetal lamellae poorly developed. Gizzard-like structure present around setigers 17-18, but not as portrayed by Blake (1996). Dipolydora sp. A (near bidentata) Zachs, 1933 PWS NIS 1998: Sta 17(18 specimens); Sta 19(1); Sta 23(2). This taxon may be a shell borer. Spines of setiger 5 without distal bristles, with flange-tooth on lateral surface (not on convex surface as fas as I can see). Caruncle to posterior setiger 4.
Chapt 9C3. Polychaete Worms, page 9C3- 15 Notosetae present on setiger 1. Prostomium deeply incised, bifurcate. Posterior notosetae capillaries; spinous packets, modified setae absent. Neurosetae without manubrium, from setiger 7, bidentate to end of body. Dipolydora. sp B PWS NIS 1998: Sta 17(1 specimen). Prostomium incised, strongly bilobed. 4 pairs of eyes. Notosetae setiger 1 present, lobe reduced to papillar lobe. Caruncle to posterior setiger 3. Setiger 5 strongly modified; heavy spines distally falcate, heavy triangular tooth on concave surface, bristles present in notch between tooth and tip of spine. Bidentate neurosetae without manubria, from setiger 7. Branchiae from setiger 7. Does not key out using Blake 1996…falls out at couplet 10 (10B where choice is presence of 2 accessory teeth) since this specimen has only 1 visible accessory tooth, and appears to lack a cowling. Dipolydora sp. C (near giardi (Mesnil, 1896)) PWS NIS 1998: Sta 21(>100 specimens); Sta30(1). Numerous specimens. Prostomium incised, bilobed. No eyes. Setiger 1 complete, notosetae present, notopodium reduced to digitiform lobe. Caruncle to setiger posterior margin setiger 3. Setiger 5 modified; spines with accessory tooth on concave surface, with partial cowling on opposite side of concave surface extending to convex surface; bristles absent. Branchiae from setiger 9. Neurosetal hooks without manubria, from setiger 7. Dipolydora quadrilobata (Jacobi, 1883) PWS NIS 1998: Sta 15(1 specimen). Incomplete specimen, and identification is tentative. Polydora limicola Annenkova, 1934 PWS NIS 1998: Sta 10(1 specimen); Sta 16(1); Sta 23(1). Incomplete specimen, and identification is tentative. Polydora sp. PWS NIS 1998: Sta 17(1 specimen). This is a juvenile specimen. It is small and slender. Prostomium entire. Eyes numbering 8. Setiger 5 is not modified. Pygidium 4-lobed. Probably not assignable to any known taxon. Nicomache personata Johnson 1901 PWS NIS 1998: Sta 11(1 specimen). Identification certain to this species, although specimen is incomplete. Pigmentation pattern characteristic of species.
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page i BIOLOGICAL INVASIONS OF COLD
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page iii • Stephan Benda, Valdez
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page v • From an industry and man
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page vii • The magnitude of seaso
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page xi microscopes for the study.
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page xiii 9C9. Echinoderms 9C9-1 9C
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