Loboixys pilosa, 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.5699929 |
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persistent identifier |
https://treatment.plazi.org/id/03C487CB-ED40-3821-FCEF-F9ADFCFAFE74 |
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treatment provided by |
Plazi |
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scientific name |
Loboixys pilosa |
| status |
sp. nov. |
Loboixys pilosa sp. nov.
( Fig. 353 View FIGURE 353 , 354 View FIGURE 354 )
Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21397 ) , paratypes (2 intact ♀♀, MNHN-IU-2014-21398), and dissected paratypes (2 ♀♀, figured) from Diplosoma multifidum (Sluiter, 1909) , Récif Néokumbi, New Caledonia, depth 40 m, Monniot coll., 10 March 1987.
Additionalmaterial. 6 ♀♀ (MNHN-IU-2018-1909) embedded in tissues of D. multifidum, Îlot Atire, NC 63, New Caledonia, 1987; 1 ♀ (MNHN-IU-2018-1910) from D. multifidum, NC 30, New Caledonia, 09 March 1987.
Etymology. The name is derived from the Latin pilos (=hairy) and refers to the hairy body surface of the new species.
Descriptionoffemale. Body ( Fig. 353A, B View FIGURE 353 ) very similar in form to Loboixys sibogae sp. nov., 1.39 mm long. Prosome 5-segmented: dorsal cephalic shield bearing paired minute horn-like processes posterolaterally ( Fig. 353D View FIGURE 353 ); surface of dorsal cephalic shield and anterior 3 pedigerous somites covered with numerous fine setules. Fourth pedigerous somite forming almost spherical brood pouch, about 970 μm long, longer than anterior part of prosome. Free urosome ( Fig. 353C View FIGURE 353 ) inserted into anterior ventral surface of brood pouch, 5-segmented: genital somite 58×182 μm; 4 abdominal somites covered with fine setules, 56×156, 51×138, 38×125, and 62×124 μm, respectively. Caudal rami broad, about 1.7 times longer than wide (93×56 μm) and 1.5 times longerthan anal somite, covered with fine setules, tapering with straight lateral margin and continuously curved inner and distal margins: armed only with 3 small distal setae.
Rostrum ( Fig. 353E View FIGURE 353 ) aslongas wide, nearly semicircular, with slight lateral constriction proximally; setulose in distal third. Antennule ( Fig. 353F View FIGURE 353 ) strongly tapering, setulose, about 120 μmlong, 5-segmented; first and second segments much wider than distal segments; armature formula 1, 5, 2, 2, and 3; setae indistinguishable from setules. Antenna ( Fig. 353G View FIGURE 353 ) 3-segmented; coxa and basis unarmed; slender endopod 4.1 times longer than wide (73×18 μm), slightly shorter than basis: armed with 6 setae (grouped as 1, 2, and 3) plus small terminal claw, aboutone-thirdaslongas endopod.
Labrum ( Fig. 353H View FIGURE 353 ) broadly inflated distally, setulose and soft. Mandible ( Fig. 353I View FIGURE 353 ) with medially broadened coxal gnathobase bearing 5 acute teeth and 1 seta: basiswith 1 setaonmedial margin: exopodwith 5 subequal setae; endopod with 1 seta on first segment and 4 setaeon second. Maxillule ( Fig. 353J View FIGURE 353 ) with 8 setae on arthrite, 1 each on epipodite and basis, 4 on exopod and 3 on endopod; coxal endite absent. Maxilla ( Fig. 354A View FIGURE 354 ) 4-segmented; syncoxa with 4, 2, and 2 on first to third endites, respectively; basis with small claw plus 2 unequal setae; endopod with 1 and 3 setae on first and second segments, respectively; setaon first endopodal segment and one setaon second thick. Maxilliped ( Fig. 354B View FIGURE 354 ) unsegmented, but constricted in middle, armed with 6 setae and ornamented with 4 rows of setules.
Legs 1–4 ( Fig. 354 View FIGURE 354 C-F) biramous with 2-segmented protopods. Inner coxal seta absent in all legs. Leg 1 with innerdistal setaon basis. Exopod 2-segmented in leg 1 and incompletely 3-segmented inlegs 2–4. Endopod 3- segmented inleg 2 and 2-segmented inlegs 1, 3, and 4. Both rami of legs 1–4 ornamented with setules in addition to setae. Setaeon all swimming legs short. First exopodal segment of legs 2–4 lacking inner seta. Outer seta on basis and 3 inner setae on exopod of leg 1 weakly pinnate; all other setae on legs 1–4 naked. Armature formula for legs 1–4 as follows:
| Coxa | Basis | Exopod | Endopod | |
|---|---|---|---|---|
| Leg 1 | 0-0 | 1-I | 1-1; 1, 1, 5 | 0-1; 1, 2, 4 |
| Leg 2 | 0-0 | 1-0 | 1-0; 1-1; 3, 1, 5 | 0-1; 0-1; 1, 2, 3 |
| Leg 3 | 0-0 | 1-0 | 1-0; 1-1; 3, 1, 5 | 0-1; 1, 2, 4 |
| Leg 4 | 0-0 | 1-0 | 1-0; 1-1; 2, 1, 5 | 0-1; 1, 2, 3 |
Leg 5 ( Fig. 354G View FIGURE 354 ) bilobed; outer (protopodal) lobe digitiform, and tipped with 1 seta; inner (exopodal) lobe broad, bearing 1 smallseta distally and acutely pointed, hook-like process mediodistally.
Male. Unknown.
Remarks. Leg 5 of Loboixys pilosa sp. nov. consists of an elongate outer lobe bearing the protopodal seta and an inner lobe representing the exopod, which carries a hook-like distal process. This form of leg 5 is the most distinctive feature of L. pilosa sp. nov., because it is unique within the genus. Other diagnostic features of the new species include: the presence of a claw plus 2 setae on the basis of the maxilla, and the endopods of legs 2 and 3 are armed with 8 setae each (compared to at most 7 setae as in L. ryukyuensis and L. sibogae sp. nov.).
Within the genus only two species, L. pilosa sp. nov. and L. capillosus ( Ho & Kim, 2009) comb. nov. have a claw on the basis of the maxilla, but these two species can be easily separated because L. capillosus has a different form of leg 5 and has fewer setae on the rami of legs 2– 4.
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