Paraonidae, , Strelzov, 1973

Sikorski, Andrey, 2017, The Paraonidae (Annelida: Sedentaria) from Norway and adjacent seas, with two new species, four new records, and a redescription of Paraonides nordica Strelzov, 1968 based on type material, Zootaxa 4320 (1), pp. 41-67 : 62-63

publication ID

https://doi.org/ 10.11646/zootaxa.4320.1.3

publication LSID

lsid:zoobank.org:pub:878A01B5-C37C-4E46-8631-16927888D8D4

DOI

https://doi.org/10.5281/zenodo.6050903

persistent identifier

https://treatment.plazi.org/id/5B0CE503-9470-FB53-8482-4903FA297957

treatment provided by

Plazi

scientific name

Paraonidae
status

 

Key to species of Paraonidae View in CoL reported from Norwegian and adjacent waters

1. Some notochaetae as modified (acicular, forked) chaetae......................................................2

- All notochaetae as capillary ones.........................................................................9

2. Modified notochaetae of anterior chaetigers forked, those of median and posterior ones acicular with subterminal spine.....3

- All modified notochaetae forked......................................................................... 4

3. Subterminal spine attached directly to stem, antenna minute and papilliform or absent in younger specimens (see remarks for the species)....................................................................... Cirrophorus branchiatus View in CoL

- Subterminal spine attached to a subdistal knob of the stem, antenna always absent................... Paradoneis armata View in CoL

4. All neurochaetae of posterior chaetigers capillary ones....................................................... 5

- Neuropodia of posterior chaetigers bearing an enlarged spine-like ventral chaeta....................................8

5. All dorsal podial lobes of prebranchial and branchial region short and tuberculate; branchiae numbering up to 15 pairs, stout and short (up to four times as long as wide); antenna not observed........................... Cirrophorus brevicirratus View in CoL .

- Dorsal podial lobes of chaetiger 1 tuberculate, then increasingly longer becoming digitiform on central branchial region; lobes shorter in postbranchial region........................................................................... 6

6. Antenna short and lanceolate; branchiae numbering up to 33 pairs, thin and long (up to six times as long as wide)............................................................................................. Cirrophorus furcatus View in CoL .

- Antenna absent; branchiae numbering 15 or less pairs......................................................... 7

7. Four prebranchial chaetigers; branchiae numbering up to 15 pairs; about four times as long as wide, shorter than body width....................................................................................... Paradoneis mikeli View in CoL

- Three prebranchial chaetigers; branchiae numbering up to 12 pairs; about six times as long as wide, longer than body width.......................................................................................... Paradoneis lyra View in CoL

8. Branchiae arranged in 6–12 pairs, bearing cilia on outer and inner margins......................... Paradoneis eliasoni View in CoL

- Branchiae arranged in 14–19 pairs, bearing cilia only on outer margin........................ Paradoneis andreae View in CoL n. sp.

9. Postbranchial neuropodia without modified capillaries...................................................... 10

- Postbranchial neuropodia bearing some sort of modified chaetae (acicular or hooked chaetae, enlarged capillaries)....... 1 1

10. Branchiae present, numbering four to six pairs................................................ Paraonides nordica View in CoL

- Branchiae absent..................................................................... Paraonides myriamae View in CoL

11. Nuchal organs as the only ciliary grooves on prostomium; frontal antenna always absent............................12

- Nuchal organs accompanied by secondary ciliary organs; frontal antenna usually present............................15

12. Modified neurochaetae as curved spines; prostomium without accessory ciliary bands.............................. 13

- Modified neurochaetae as strongly curved hooks bearing subdistal sheath; prostomium with accessory ciliary bands............................................................................................... Paraonis fulgens View in CoL

13. Modified neurochaetae as short and strongly curved hooks; 3–5 pairs of short branchiae.................. Levinsenia flava View in CoL

- Modified neurochaetae as long, gently curved hooks; branchiae longer than body width............................14

14. Modified neurochaetae without a ridge on the convex edge; pigmented areas surrounding nuchal organs; branchiae very long (about seven times as long as wide)........................................................ Levinsenia oculata View in CoL

- Modified neurochaetae bearing a ridge on the convex edge, without pigmented areas surrounding nuchal organs; branchiae moderately long (about four times as long as wide)............................................. Levinsenia gracilis View in CoL

15. Modified neurochaetae hooked with subterminal spine on concave side of stem; frontal antenna articulate..............16

- Modified neurochaetae otherwise; frontal antenna smooth if present............................................17

16. Frontal antenna long, multiarticulate.................................................. Aricidea (Aricidea) wassi View in CoL

- Frontal antenna short, with only one articulation........................................ Aricidea (Aricidea) minuta View in CoL

17. Postbranchial neuropodia bearing capillaries clearly thicker than corresponding notochaetae together with modified chaetae1 8

- Postbranchial neuropodia bearing capillaries similar to corresponding notochaetae together with acicular modified chaetae.23

18. Frontal antenna absent.................................................. Aricidea (Strelzovia) parabelgicae View in CoL n. sp.

- Frontal antenna present................................................................................ 19

19. Modified neurochaetae abruptly tapering, with slender terminal spine...................... Aricidea (Strelzovia) suecica View in CoL

- Modified neurochaetae gradually tapering, terminal spine as continuation of tip or absent...........................20

20. Ventral-most modified neurochaetae clearly thicker and more strongly curved than the rest; frontal antenna reaching beyond posterior end of chaetiger 2................................................... Aricidea (Strelzovia) quadrilobata View in CoL

- All modified neurochaetae similar in thickness; frontal antenna shorter..........................................21

21. Dorsal podial lobes of chaetiger 1 similar in length to those of remaining prebranchial chaetigers; branchiae relatively thin, cylindrical and gradually tapering; notopodial postchaetal lobes of postbranchial region threadlike and bearing a minute distal swelling................................................................... Aricidea (Strelzovia) albatrossae View in CoL

- Dorsal podial lobes of chaetiger 1 clearly shorter than those of remaining prebranchial chaetigers; branchiae flask shaped and abruptly tapering at least on posterior half of branchial region; notopodial postchaetal lobes of postbranchial region without distal swelling.......................................................................................22

22. Prostomium slightly longer than wide; frontal antenna similar in width all along and with rounded tip; branchiae erect, longer than body width and bearing a long filamentous tip in posterior branchial region.............. Aricidea (Strelzovia) roberti View in CoL

- Prostomium triangular and clearly wider than long; frontal antenna with wider base and tapering tip; branchiae lying over dor- sum, shorter than body width, tapering through complete branchial region................. Aricidea (Strelzovia) hartmani View in CoL

23. Acicular modified neurochaetae without terminal spine.......................................................24

- Acicular modified neurochaetae with terminal spine.........................................................25

24. Tip of stem strongly curved and bearing hood; prostomium elongate and round in front; antenna inserted on posterior half of prostomium reaching anterior margin of chaetiger 1...................................... Aricidea (Acmira) cerrutii View in CoL

- Tip of stem gently curved and without hood; prostomium wider than long and triangular; antenna inserted on anterior half of prostomium and never reaching chaetiger 1............................................ Aricidea (Acmira) simonae View in CoL

25. Prostomium as equilateral triangle; frontal antenna directed posteriorly and reaching up to posterior end of chaetiger 2; bran- chiae in posterior branchial region ending in a long filament; modified neurochaetae with stem tip covered by a fine hood................................................................................. Aricidea (Acmira) catherinae View in CoL

- Prostomium longer than wide; frontal antenna short and barely reaching chaetiger 1; branchiae in posterior branchial region tapering evenly, modified neurochaetae with stem tip fringed with fine hairs.................. Aricidea (Acmira) laubieri View in CoL

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Paraonidae

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