Paralumbricillus sp.
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publication ID |
https://doi.org/10.5324/fn.v43i0.5886 |
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persistent identifier |
https://treatment.plazi.org/id/038B87E9-FFB2-5109-60CA-D3E3FED5FA02 |
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treatment provided by |
Felipe |
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scientific name |
Paralumbricillus sp. |
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Paralumbricillus sp. “ Norway ” Figure 14 View Figure 14
Material examined. ZMBN 129412 View Materials ( CE34074 ) , ZMBN 129413 View Materials ( CE34075 ) , ZMBN 157976 View Materials ( CE34077 ) , ZMBN 153283 View Materials ( CE34085 ) & ZMBN 129422 View Materials ( CE34115 ) five immature or partially mature specimens from Reinefjorden , Reine , Moskenes , Lofoten, Nordland, Norway. In lower intertidal. Coll. C. Erséus & M. Klinth, 7 September 2017. For details on collection site and GenBank accession numbers see Table S1 .
Description. White worms. Length of first 25–44 segments 3.1– 6.0 mm (fixed, amputated specimens); first 15 segments 1.6–1.9 mm long; width at clitellum 0.29–0.34 mm. Chaetae straight or slightly sigmoid, usually with an expanded ental hook similar to that of the chaeta in many Grania species. Dorsolateral and ventral bundles with 2 chaetae anterior and posterior to clitellum. Each worm’s longest measured chaetae 65–75 µm long, about 5 µm wide. Clitellum not developed. Head pore at 0/1.
Coelomocytes numerous, about 10–20 µm long, round or oval, granulated with distinct nucleus. Paired pharyngeal glands present in IV, V and VI; each pair converging dorsally ( Figure 14A View Figure 14 ). Dorsal vessel originating in XII–XV. Nephridia observed in 7/8–9/10, and from 13/14 rearwards, about 45–105 µm long. Anteseptale small, consisting of funnel only. Postseptale oval, tapering into posteroventral efferent duct ( Figure 14B View Figure 14 ). Brain with posterior incision.
Male genitalia only partially developed. Testes and sperm funnels in XI, ovaries and penial bulbs in XII. Spermathecae developing in V, with pores at lateral line. No midventral subneural glands observed.
Geographical distribution including BOLD data. Only known from two localities in Norway, Reinefjorden (Nordland) and Orkland ( Trøndelag ) .
Remarks. Unfortunately, we found no fully mature specimens of this species, which evidently can be regarded as a part of the new genus Paralumbricillus , according to the molecular data ( Figure 2 View Figure 2 ). All five examined specimens had only two chaetae per bundle, a character shared with P. dubius (which genetically is a separate species but supported as sister to this species), P. cervisiae ( Kossmagk-Stephan, 1983) , P. christenseni ( Tynen, 1966) and P. westheidei , all of which could be identical to our species but none of which have been reported from Norway.
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