Knightjonesia Pillai, 2009, new genus
Knightjonesia, new genus Diagnosis . Tube sinistrally coiled; opercular peduncle winged; thoracic membranes not joined over thorax. Thorax bears 4 chaetal fascicles, including collar chaetal fascicle, and 3 uncinal tori on concave side left side; two uncinal tori on convex side. Collar chaetae simpl...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2009
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| Online Access: | https://doi.org/10.5281/zenodo.6220824 http://treatment.plazi.org/id/6C1187F0FFEDB117FF5328E2FEDCFAD9 |
| Summary: | Knightjonesia, new genus Diagnosis . Tube sinistrally coiled; opercular peduncle winged; thoracic membranes not joined over thorax. Thorax bears 4 chaetal fascicles, including collar chaetal fascicle, and 3 uncinal tori on concave side left side; two uncinal tori on convex side. Collar chaetae simple blades i.e., lacking a fin at base of blade; remaining thoracic fascicles lack sickle-shaped chaetae ( Apomatus -chaetae); thoracic uncini slender, bearing 1-few rows of teeth; abdominal uncini with several rows of teeth; most anterior uncinal process gouged. Type species: Knightjonesia platyspira ( Knight-Jones) 1978 = Helicosiphon platyspira Knight-Jones, 1978. Material examined : Type Material : Holotype of Helicosiphon platyspira Knight-Jones 1978: BM (NH) 1976: 883, Marion Island, Prince Edward Islands, southeast of Port Elizabeth, consisting only of an operculum; and its paratypes BM (NH) 1976: 884–899 from the same locality. The latter consist of several individuals of various sizes, from tiny juveniles to adults, the tubes of many of which remain unopened. Some of them were extracted from their tubes in order to study the stages in formation of peduncular wings. Description . As stated by P. Knight-Jones (1978) the present species is, compared to other spirorbids, a very large species, attaining a coil diameter of 5.0mm when coiled in the same plane. In addition to the generic diagnosis above, see P. Knight-Jones (1978: 233–234) and P. & E. W. Knight-Jones (1994) for further details relating to the tube, worm, chaetae, egg-sac attachment, and other characters. The egg sac and its attachment to the specialized process in the dorsal thoracic groove are shown in Fig. 2E. The brief description which follows is limited to the character of its winged opercular peduncle. Initially the wings are short and faintly recognizable (Fig. 2 B). In a later stage (Fig. 2C), they are narrow and elongated. The more fully developed wings are shown in Figs. 2, A, D & E. Etymology. The genus is dedicated to both Prof. E. ... |
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