Pseudopotamilla aspersa Kroyer 1856
Pseudopotamilla aspersa (Krøyer, 1856) reinstated ( Fig. 4) Sabella aspersa Krøyer, 1856: 19 –20. Material examined. Type material: Type (ZMUC – POL 00423), Greenland, by default as two other syntypes are missing. In the description, other data in brackets comes from unpublished drawings and notes o...
| Main Authors: | , , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2017
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| Subjects: | |
| Online Access: | https://zenodo.org/record/6040991 https://doi.org/10.5281/zenodo.6040991 |
| Summary: | Pseudopotamilla aspersa (Krøyer, 1856) reinstated ( Fig. 4) Sabella aspersa Krøyer, 1856: 19 –20. Material examined. Type material: Type (ZMUC – POL 00423), Greenland, by default as two other syntypes are missing. In the description, other data in brackets comes from unpublished drawings and notes of one of Krøyer’s missing syntypes (RLC, New Royal collection, 322). Diagnosis. Collar with low, rounded lappets dorsally; dorsal collar margin convex; peristomium slightly exposed laterally; lateral margins of collar V-shaped; handles of companion chaetae twice length of handles of adjacent uncini. Description. Body length (without radiolar crown) about 31 (48) mm and 2 mm wide (Fig. 4 A). Crown damaged, but Krøyer’s unpublished figures of a lost syntype shows crown length equal to length of 8 thoracic segments and Fig. 4 M (copy of Krøyer’s figure) shows a detached crown with one or two single compound eyes per radiole, except dorsal-most. Dorsal lip with bifid appearance, but difficult to see (Figs 4 B–D). Body (damaged posteriorly) with about 60 (90) abdominal segments and 10 thoracic ones. First thoracic segment about twice length of following ones (Fig. 4 B). Dorsal collar margins convex with rounded, low lappets extending above junction of crown and thorax. Oblique lateral collar margins sloping posteriorly, forming each side a wide V–shaped notch showing peristomium (Fig. 4 B). Highest ventral collar margin distant from midline incision in front of small ventral sacs (Fig. 4 B–D). Anterior margin of first ventral shield indented medially, following thoracic shields rectangular, some with indistinct transverse grooves (Fig. 4 D). Thoracic tori with gap between ventral ends and lateral margins of shields (Fig. 4 B). Thoracic tori with about nine avicular uncini each with numerous teeth on crest covering third of main fang, and handle not much longer than length from breast to crest, but adjacent companion chaetae with handle at least twice as long (Figs 4 J–L). First thoracic fascicle with two rows of broadly ... |
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