Lanassicola bilobatus, Boxshall & O’Reilly & Sikorski & Summerfield, 2019

Boxshall, Geoff A., O’Reilly, Myles, Sikorski, Andrey & Summerfield, Rebecca, 2019, Mesoparasitic copepods (Copepoda: Cyclopoida) associated with polychaete worms in European seas, Zootaxa 4579 (1), pp. 1-69 : 48

publication ID

https://doi.org/ 10.11646/zootaxa.4579.1.1

publication LSID

lsid:zoobank.org:pub:A4015309-D9B3-4BB7-ABCB-B88A1F8CE5FC

DOI

https://doi.org/10.5281/zenodo.5927060

persistent identifier

https://treatment.plazi.org/id/97720E2D-FFC4-D633-CBF7-B92105A4F5D8

treatment provided by

Plazi

scientific name

Lanassicola bilobatus
status

gen. et sp. nov.

Lanassicola bilobatus gen. et sp. nov.

Type material: Holotype ovigerous ♀ from tube of Lanassa nordenskjoeldi Malmgren, 1866 , Argus Miljø, Stn 2-2 (67° 08.515’N, 15° 24.902’E), depth 245 m, 12 May 2011; collected by A. Sikorski; NHMUK Reg. No. 2015.466. 2 allotype ♂♂ attached to GoogleMaps Holotype female; same locality and habitat data.

Differential diagnosis. Adult female ectosoma ( Fig. 19A View FIGURE 19 ) elongate, about 3.5 times longer than maximum width, connected to small bulla inserted within host, via short stalk. Ectosoma dorsoventrally flattened, about 2.79 mm in length and with a maximum width of about 0.8 mm anteriorly, tapering to a width of about 0.5 mm posteriorly. Cephalothorax with paired frontal and anterolateral lobes. Frontal lobes directed slightly anterolaterally, unarmed, probably representing antennules. Anterolateral lobes expanded dorsally ( Fig. 19B View FIGURE 19 ). Posterior margin of ectosoma ( Fig. 19C View FIGURE 19 ) expanded to form median lobe bearing anal slit. Paired genital apertures located ventrally at posterolateral extremities of ectosoma. Cement glands irregularly curved ( Fig. 19C View FIGURE 19 ), up to 0.6 mm in length. Egg sacs multiseriate, about 3.76 mm in length ( Fig. 19A View FIGURE 19 ).

Paired antennae located anterior to stalk originating in oral region ( Fig. 19B View FIGURE 19 ); directed medially. Antenna 2- segmented ( Fig. 19D View FIGURE 19 ); proximal segment unarmed, distal segment with paired corrugated adhesion pads. Maxilla ( Fig. 19E View FIGURE 19 ) located posterolateral to stalk; comprising robust proximal segment; distal segment with paired corrugated pads.

Male sac-like ( Fig. 20A View FIGURE 20 ), pear-shaped with narrow anterior end and broad posterior extremity, 110 µm in length, with maximum width of 82 µm. Paired antennules located anteriorly on lateral margin, paired antennae located on frontal margin either side of mid-line ( Fig. 20A View FIGURE 20 ). Antennules unsegmented ( Fig. 20B View FIGURE 20 ), tapering, armed with 5 setae along anterior margin and apex. Oral region modified into funnel-like structure located anteriorly on ventral surface. Oral funnel ovoid in ventral view ( Fig. 20C View FIGURE 20 ), enclosing paired spinulate pads. Maxillae similar in structure to those of female, located posterior to oral funnel on ventral surface ( Fig. 20C View FIGURE 20 ). Male producing paired cylindrical spermatophores ( Fig. 20D View FIGURE 20 ) about 30 µm long, each with short tubule.

Etymology. The name of the new species, bilobatus , alludes to the presence of two pairs of lobes on the frontal margin of the cephalothorax.

Remarks. The adult female of Lanassicola bilobatus gen. et sp. nov. can be distinguished from L. arcticus gen. et sp. nov. by the bilobate frontal margin of the cephalothorax in the former compared to the unilobate condition of the latter. The paired lobes of L. bilobatus gen. et sp. nov. are interpreted as representing antennulary and anterolateral lobes. The body of L. bilobatus gen. et sp. nov. is also larger, so the body length of the adult female is 2.79 mm, compared to 2.19 mm in the type species, and the trunk is thicker and more robust. The adult male of L. bilobatus gen. et sp. nov. is sub-triangular in dorsal view compared to the rounded sac-like trunk of male L. arcticus gen. et sp. nov.

The ectosoma was detached from the host and so there is no information on the form of the endosoma, or on the positioning on the host.

NHMUK

Natural History Museum, London

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