Claviramus kyushuensis, Nishi, Eijiroh, Tanaka, Katsuhiko & Tovar-Hernandez, Maria Ana, 2019
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publication ID |
https://dx.doi.org/10.3897/zookeys.880.36281 |
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publication LSID |
lsid:zoobank.org:pub:828802F3-AB71-42E1-A369-40D2CBC4C90C |
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persistent identifier |
https://treatment.plazi.org/id/AF7C503A-E9B9-4424-840B-191F1718015A |
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taxon LSID |
lsid:zoobank.org:act:AF7C503A-E9B9-4424-840B-191F1718015A |
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treatment provided by |
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scientific name |
Claviramus kyushuensis |
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sp. nov. |
Claviramus kyushuensis sp. nov. Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3
Material examined.
Ariake Sound, Kyushu, Japan, Stn 20D, 32°31.070'N, 130°14.037'E, 20 m depth, sandy mud bottoms, collected by dredge by K. Mori, 17 September 2005. Holotype CBM-ZW 1123, Paratypes CBM-ZW 1124-1126 (three paratypes: two complete, one lacking crown), UANL 8130 (three paratypes: two complete, one lacking crown).
Diagnosis.
Subdistal ends of some radioles with lateral margins extended, thin, as foliaceous flanges ( Figs 1 E–G View Figure 1 , 2F View Figure 2 ), some with a short, distal filament or cirrus ( Fig. 1G View Figure 1 ). Glandular ridge on chaetiger 2 present. Abdominal shields well developed ( Figs 1B View Figure 1 , 2C View Figure 2 ). Dorsal pockets of collar present exposing large vascular loops ( Fig. 1D View Figure 1 ). Anterior peristomial ring not extending beyond ventral collar margins. Ventral margin of collar with a shallow mid-ventral incision forming two discrete rounded lappets ( Figs 1B, C View Figure 1 ). Thoracic tori not contacting shields ( Fig. 1B View Figure 1 ). Thoracic uncini with tips of main fangs bifid ( Fig. 3 C–D View Figure 3 ).
Description.
Sabellid worm with eight thoracic (eight in all types) and ten abdominal chaetigers (9-16 in paratypes CBM ZW 1124-1126, UANL 8130). Trunk length 2.5 mm (1.6 mm in paratype CBM-ZW 1125, 3.2-4.7 mm in paratypes UANL 8130), body width 0.7 mm (0.3 mm in paratype CBM-ZW 1126, 0.5-1.3 mm in paratypes UANL 8130). Radiolar crown 1.1 mm length (1.3-2.1 mm in paratypes UANL 8130), with seven radioles in each branchial lobe (7-9 in paratypes UANL 8130).
Palmate membrane absent. Subdistal ends of some radioles with lateral margins extended, thin, as foliaceous flanges; overall shape oblong ( Figs 1 E–G View Figure 1 , 2F View Figure 2 ) with a mid-ventral incision occupying a quarter of flange length; some tips with a short, distal filament ( Fig. 1G View Figure 1 ). Other radioles with unflanged tips, filiform ( Fig. 2D View Figure 2 ) or with broken tips ( Fig. 2E View Figure 2 ). Largest pinnules located at 3/4 of radiole length ( Fig. 2D View Figure 2 ). Radiolar eyes absent. Two pairs of ventral radiolar appendages, as long as half of radiolar crown length. Dorsal lips narrow, triangular, longer than wide. Ventral lips rounded, low. Dorso-lateral margins of collar fused to faecal groove; dorsal pockets present ( Figs 1A, D View Figure 1 , 2A View Figure 2 ); large vascular loops visible on dorsal pockets of collar ( Fig. 1D View Figure 1 ); ventral sacs absent. Ventral margin of anterior peristomial ring as broadly triangular lobe, not extending beyond collar margins. Ventral collar margin with a shallow mid-ventral incision forming two discrete rounded lappets ( Figs 1B, C View Figure 1 , 2B View Figure 2 ). Lateral collar margins slightly oblique, with ventral margin slightly higher than dorsal. Thoracic and abdominal shields well developed ( Figs 1B, C View Figure 1 , 2C View Figure 2 ). Collar shield divided transversally into three nearly rectangular sections with lateral margins indented ( Fig. 2B View Figure 2 ). A pair of white triangular glandular pads in the ventral side of collar, as lung-shaped. Shields from chaetigers 2 to 8 rectangular, broad, entire ( Figs 1B View Figure 1 , 2B View Figure 2 ). Abdominal shields forming two squares divided by faecal groove ( Figs 1B View Figure 1 , 2C View Figure 2 ). Narrow glandular ridge on chaetiger 2 present, most notorious laterally ( Fig. 1A, D View Figure 1 ). Thoracic tori not contacting shields ( Fig. 1B, C View Figure 1 ). Thoracic notopodial fascicles in chaetiger 1 as short as rows of narrowly hooded chaetae (collar chaetae) ( Fig. 3A View Figure 3 ). Notopodial fascicles in chaetigers 2-8 with superior group of narrowly hooded chaetae and two inferior rows of broadly hooded chaetae ( Figs 2I View Figure 2 , 3B View Figure 3 ). Thoracic neuropodial uncini acicular ( Fig. 2G View Figure 2 ); main fang bifid, surmounted by 5-6 rows of small equal-sized teeth ( Fig. 3C, D View Figure 3 ), breast as a narrow swelling; handles very elongate ( Fig. 2G View Figure 2 ). Abdominal neuropodial fascicles with one or two transverse rows of narrowly hooded chaetae ( Fig. 3E View Figure 3 ). Abdominal notopodia with avicular uncini ( Figs 2H View Figure 2 , 3F View Figure 3 ); main fang surmounted by 7-9 rows of small teeth equal in size, occupying a half of the main fang length ( Fig. 3F View Figure 3 ); breast well developed; handles short ( Fig. 2H View Figure 2 ). Pygidium triangular without eyes neither cirrus ( Figs 1B View Figure 1 , 2C View Figure 2 ). Anus ventral. Tubes not preserved. Paratypes mature hermaphrodites with full-developed oocytes and sperm in thoracic and abdominal segments.
Etymology.
The specific epithet is named after type locality, Kyushu, Japan.
Remarks.
Among the species currently recognized in Claviramus , C. kyushuensis sp. nov., is unique by having a collar shield rectangular, divided transversally into three nearly equal-sized sections; a glandular ridge on chaetiger 2; abdominal shields well developed; main fang of thoracic uncini with bifid tips and the presence of a short, distal filament in some radioles.
Claviramus grubei has also a glandular ridge on chaetiger 2, a short mid-ventral incision of distal radiolar flanges and radiolar tip filaments, but it differs of C. kyushuensis sp. nov., by lacking abdominal shields (present in C. kyushuensis sp. nov.) (Table 1 View Table ).
Claviramus kyushuensis sp. nov., differs from C. oculatus and C. candelus mainly by lacking pygidial eyes (present in C. oculatus and C. candelus ) and having a collar shield rectangular, divided transversally into three nearly equal-sized sections (entire in C. candelus , divided into two areas in C. oculatus ) (Table 1 View Table ).
In addition, SEM images used in this study reveals that tips of main fangs of thoracic uncini are bifid ( Fig. 3C, D View Figure 3 ). This peculiarity has been only reported in Amphicorina triangulata López & Tena, 1999 by Cepeda and Lattig (2017). However, in A. triangulata , the presence of a large tooth above the main fang in the midline, followed by a third tooth offset from midline, and then followed by series of smaller teeth, is remarkable. In Claviramus kyushuensis sp. nov., all rows of teeth above the main fang are nearly equal-sized ( Fig. 3C, D View Figure 3 ).
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