Caberea ellisii (Fleming, 1814)
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publication ID |
https://doi.org/ 10.1007/s13127-022-00562-y |
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persistent identifier |
https://treatment.plazi.org/id/03AC87AF-FFBB-FFBD-FF20-CAAF86C89E9F |
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treatment provided by |
Felipe |
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scientific name |
Caberea ellisii |
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Caberea ellisii View in CoL ( Figs. 2C View Fig , 15 View Fig , 19B, D)
Avicularium
Cystid and mandible The small adventitious avicularia are situated on the frontal gymnocyst of the autozooid below the proximal edge of the opesia (area covered by frontal membrane) ( Fig. 15A View Fig ). The avicularium is oval in frontal view. The semicircular mandible occupies slightly less than half of the avicularian frontal surface. It consists of the upper, the lower, and the transverse walls and the internal cavity. The proximal part of the lower wall of the mandible is internal, with the upper vestibular wall lying beneath. The distal margin forms thickened sclerite with a hook-shaped tip. The postmandibular area (covered by the frontal membrane) is semicircular.
Polypide and muscular system The vestigial polypide is located in front of the adductor muscles in the distal part of avicularian cystid. It consists of the rudimentary ciliated lophophore surrounded by the oval tentacle sheath, and the rounded ganglion beneath ( Figs. 15C View Fig , 19B). Diaphragmatic muscles form a loose short “cone” in the distalmost part of the tentacle sheath ( Fig. 15E View Fig , inset), but we were unable to find its longitudinal muscles. The polypide retractors are represented by two small (presumably striated) muscle fibers attached to the lower part of the tentacle sheath.
Two smooth abductors are situated in the proximal part of the avicularian cystid. Each abductor consists of 2–3 tightly packed thin muscle bundles of about the same length, anchoring on the proximo-lateral cystid walls just behind the adductor muscles ( Fig. 15E View Fig ). The distal ends of the abductors are attached to the frontal membrane within two short parallel zones.
The paired striated adductors occupy most of the cystid volume, anchoring on the basal, lateral and proximal walls of the cystid ( Figs. 15C, E View Fig , 19B). Distally, each muscle bundle continues to a tendon supposedly inserting into the upper vestibular wall.
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