Bysonebidens, Kim & Boxshall, 2020
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publication ID |
https://doi.org/ 10.11646/megataxa.4.1.1 |
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DOI |
https://doi.org/10.5281/zenodo.5699885 |
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persistent identifier |
https://treatment.plazi.org/id/03C487CB-EEEA-3B8B-FCEF-FDCFFD0DFECA |
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treatment provided by |
Plazi |
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scientific name |
Bysonebidens |
| status |
sp. nov. |
Bysonebidens sp. nov.
( Figs. 294 View FIGURE 294 , 295 View FIGURE 295 )
Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21356) , paratype (intact ♀, MNHN-IU-2014-21357), and dissectedparatype (♀, figured) from Chorizocarpaguttata Michaelsen, 1904 , Canal Woodin, New Caledonia, depth 18m, Monniot coll., 11 March 1987.
Etymology. The specific name is the combination of Latin words bi (=double) and dens (=a tooth), referring to the pair of ventrodistal denticles on the surface of the labrum.
Description of female. Body ( Fig. 294A View FIGURE 294 ) with stout prosome and elongate urosome; body length 1.48 mm. Prosome 0.93 mm long: cephalosome clearly defined from inflated metasome; first and second pedigerous somites defined, but third and fourth pedigerous somites completely fused forming brood pouch. Free urosome ( Fig. 294B View FIGURE 294 ) slender, 5-segmented: genitalsomite 68×294 μm, much wider than long; 4 abdominal somites gradually narrowing, 84×193, 84×123, 82×110, and 68×105 μm, respectively. Caudalramus ( Fig. 294C View FIGURE 294 ) gradually narrowing distally, 3.6 times longer than wide (130×36 μm): armed with 6 setae; proximal and dorsal setae located at 32 and 63% of ramus length, respectively; all setae shorter than width of ramus at base.
Rostrum ( Fig. 294D View FIGURE 294 ) 64×89 μm, tapering, with rounded and sclerotized distal margin. Antennule ( Fig. 294E View FIGURE 294 ) 170 μmlong, 6-segmented; armatureformula 3, 17, 7+aesthetasc, 3, 2+aesthetasc, and 11+2 aesthetascs; setae naked and relatively short; setae on first segment not enlarged. Antenna ( Fig. 294F View FIGURE 294 ) 4-segmented; coxa, basis, and first endopodal segment unarmed; compound distal endopodal segment 3.1 times longer than wide: armed with 5 setae (2 located at base of terminal claw) plus terminal claw, 33 μm long.
Labrum ( Fig. 294G View FIGURE 294 ) bearing smooth ventral lobe, pair of ventrodistal denticles near midline, patches of minute setules ventrodistally, and with concave posterior margin. Mandible ( Fig.294H View FIGURE 294 )withbroadcoxalgnathobasebearing 5 teeth and 1 distal, spinule-like subsidiary denticle: basis with 1 setaonmedial margin; exopod armedwith 4 setae; setae becoming gradually shorter from proximal to distal; endopod armed with 2 and 5 setae on first and second segments, respectively; middle setaon second endopodal segment markedly longer than other endopodal setae. second exopodal segment with short trace of articulation on outer side. Legs 2–4 with rudimentary inner coxal seta ( Fig. 295C, D View FIGURE 295 ); outer seta on basis also small; all setae on endopod naked; outer setae on exopod small and bluntly tipped. Second endopodal segment of leg 4 elongated, about 4 times longer than first. Armature formula for legs 1–4 as in B. brevicaudatus sp. nov., except formula IV, I, 4 for second exopodal segment of leg 1. Leg 5 ( Fig. 295E View FIGURE 295 ) small, consisting of 1 seta located on slight ventrolateral lobe and lobate tapering exopod, notarticulated at base, armed distally with 2 unequal setae.
Male. Unknown.
Remarks. Bysone bidens sp. nov. is more similar to B. brevicaudatus sp. nov. than to B. operculatus ; both share several character states including the 3-segmented endopod of the maxilla (2-segmented in B. operculatus ), the presence of a claw on the maxillary basis (only setae present in B. operculatus ), the inner coxalseta is present in allswimming legs (present onlyin leg 1 in B. operculatus ), and the second endopodal segment of leg 1 is armed with 7 setae (compared with 6 setaein B. operculatus ).
The salient differences between B. brevicaudatus sp. nov. and B. bidens sp. nov. are 7 setae on the maxilliped in the latter (vs. 9 setae in B. brevicaudatus sp. nov.), 4 setae on the second exopodal segment of leg 1 (vs. 3 setae in B. brevicaudatus sp. nov.), and a protopodal seta in leg 5 (vs. this seta absent in B. brevicaudatus sp. nov.).
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.