Chone kroyerii Sars, 1862
publication ID |
https://doi.org/ 10.5281/zenodo.177378 |
DOI |
https://doi.org/10.5281/zenodo.5697314 |
persistent identifier |
https://treatment.plazi.org/id/03CE472C-FFBA-FF81-FF7A-FB30FEFE9D98 |
treatment provided by |
Plazi |
scientific name |
Chone kroyerii Sars, 1862 |
status |
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Chone kroyerii Sars, 1862 View in CoL
Figure 8 View FIGURE 8
Chone View in CoL kr ø yerii Sars, 1862: 35 –37.— Cochrane, 2000: 144 –145.
Material examined. Non-type material. Bogestr Ø mmen [ ZMO] (1).
Additional material. Chone duneri Malmgren, 1867 [ ZMUC POL –1755, Norway]. Chone infundibuliformis Kr ø yer, 1856 [ ZMUC POL –1749, paralectotype].
Description. Colour, body shape, and size. Body cream-coloured, no branchial crown. Trunk cylindrical. Body length 24 mm, width 0.4 mm. Tube unknown.
Branchial lobes and branchial crown. Insertion of the branchial crown not exposed beyond collar ( Fig. 8 View FIGURE 8 B).
Peristomium . Anterior peristomial ring lobe (aprl) not exposed beyond collar, distally entire, triangular ( Fig. 8 View FIGURE 8 B). Posterior peristomial ring collar: antero-dorsal, ventral and lateral margins entire, ventral margin higher than dorsal ( Fig. 8 View FIGURE 8 D); longitudinal grooves on dorsal side of collar; entire length of mid-dorsal collar margins forms a broad gap ( Fig. 8 View FIGURE 8 B). Dorsal pockets well developed. Ventral shield of collar rectangular (not easily discernible). Ratio of posterior peristomial ring collar length versus chaetiger 2 length, in lateral view: 2:1.
Thorax. Chaetigers 2 to 8: notopodia– two irregular rows of elongate, narrowly hooded chaetae; one anterior row with narrow bayonet chaetae ( Fig. 8 View FIGURE 8 H); two posterior rows with symmetrical; paleate chaetae with a medium-sized mucro ( Figs 8 View FIGURE 8 E–G); neuropodia– two irregular rows of acicular uncini per torus, main fang surmounted by three rows of teeth ( Fig. 8 View FIGURE 8 J), second tooth enlarged, located in the midline, dentition covering one quarter of the main fang length. Glandular ridge on chaetiger 2: narrow.
Abdomen. Abdominal segments: 51. Anterior abdominal uncini with the main fang surmounted by five rows of teeth equal in size ( Fig. 8 View FIGURE 8 K), occupying less than half the length of main fang, main fang not extending beyond breast, breast rectangular. Posterior abdominal uncini with four rows of teeth equal in size ( Fig. 8 View FIGURE 8 L). Very long, narrowly hooded chaetae ( Fig. 8 View FIGURE 8 I). Pygidium with triangular posterior margin ( Fig. 8 View FIGURE 8 D).
Gametes. Male with spermatozoa in thorax and abdomen: acrosome elongate, triangular, nucleus barrelshaped, two rounded mitochondria ( Fig. 8 View FIGURE 8 C).
Methyl green staining. Collar dorsal and lateral surfaces completely stained ( Figs 8 View FIGURE 8 B, D), collar ventral surface coloured only the base of the ventral collar shield ( Fig. 8 View FIGURE 8 A), other areas with small dark points. Thorax dorsally less stained than ventrally ( Fig. 8 View FIGURE 8 B).
Remarks. Sars (1862) stated that the specimens resembled Chone paucibranchiata (Kr ø yer, 1856) to such an extent that he was long predisposed to assume that taxon; however, the number of radioles is not a character to differentiate species and the biannulate condition in thoracic segments is a common pattern in Chone . Chone kroyerii was referred to C. infundibuliformis by Malmgren (1866) and Fauvel (1927), but Cochrane (2000) recognized this taxon as valid. Chone kroyerii , C. duneri and C. infundibuliformis have anterior and posterior abdominal uncini with similar shape (not modified); C. kroyerii and C. infundibuliformis have the branchial lobes not exposed beyond collar (exposed in C. duneri ); C. kroyerii has a broad collar gap (narrow in C. infundibuliformis ), and the ventral margin of collar higher than C. infundibuliformis . Among species of Chone included in this revision, C. kroyerii is unique by having a rectangular ventral shield of collar ( Table 2 View TABLE 2 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Chone kroyerii Sars, 1862
Tovar-Hernández, María Ana 2007 |
Chone
Cochrane 2000: 144 |
Sars 1862: 35 |