Myxicola steenstrupi Kroyer 1856

• Published in: Frontiers in Immunology
• Main Author: Darbyshire, Teresa
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Sabellida; Sabellidae; Myxicola; Myxicola steenstrupi; Faroe Islands; Greenland; greenlandic
• Online Access: https://doi.org/10.5281/zenodo.10164562; http://treatment.plazi.org/id/03B80677FFEFFF3EFD80BB84685FF92C

Myxicola steenstrupi Krøyer, 1856 Material examined Syntypes FAROE ISLANDS • 1 spec.; Tórshavn; NHMD 109911. GREENLAND • 1 spec.; NHMD 109912. Additional material FAROE ISLANDS • 1 spec., 1 juv.; head of Kaldbakfjord; depth 1–2 m; P. Knight-Jones leg.; from abandoned Mytilus ropes; NMW.Z.2009.038.0673. Description Faroese specimens Faroe Islands syntype complete, in 2 pieces, with 54 chaetigers, 7–8 thoracic (difficult to determine due to condition) and 46 abdominal; body length 26 mm, crown length 11 mm. Other specimens complete, with 46 and 50 chaetigers, of which 8 are thoracic; body lengths 12 and 31 mm, crown lengths 5 and 9 mm. Preserved colour cream (NMW.Z) or pale brown (syntype), no pigment observed. 1–2 minute interramal (thoracic) and lateral (abdominal) eyespots present on NMW.Z specimens only, as well as pygidial eyespots, pygidium tip missing on type. Radiolar crown with semicircular radiolar lobes bearing 20 pairs of radioles (type) or 12 and 17 pairs, respectively, on juvenile and larger NMW.Z specimens. Connecting basal membrane long (damaged between most radioles on type). All radiole tips damaged except on juvenile: very high basal membrane with free portion of tip less than 10% total length of radiole, tip tapering to a blunt point; pinnulae long, thin, ca 0.25 × total length of radiole, terminating below lower margin of basal membrane. Radiolar eyes absent. Dorsal lips with small, digitiform radiolar appendages, arising centrally, surrounded by enlarged, lobate ventral lips that overlap centrally, connected to radiolar lobes dorsally; pinnular appendages absent; ventral radiolar appendages absent; parallel lamellae and ventral sacs both absent. Anterior peristomial ring with small ventral, triangular lobe, concave. Lateral notches present. Notopodia as oval cushions with fine notochaetae, number difficult to assess due to damage, but less than 100. Form of notochaetae and uncini not observed. Tube not present. Greenlandic syntype Syntype complete with 55 chaetigers, 8 thoracic and 47 ...