Enterocola sedentarius, Kim & Boxshall, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.4978.1.1 |
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publication LSID |
lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93 |
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DOI |
https://doi.org/10.5281/zenodo.5047151 |
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persistent identifier |
https://treatment.plazi.org/id/3729879B-FF07-FF15-FA93-FF10D5781ACB |
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treatment provided by |
Plazi |
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scientific name |
Enterocola sedentarius |
| status |
sp. nov. |
Enterocola sedentarius sp. nov.
( Figs. 148 View FIG , 149 View FIG )
Type material. Holotype ♀ (MNHN-IU-2014-21558) and 1 ♀ paratype (dissected, MNHN-IU-2014-21475) from eypçdẚstçma deerratum (Sluiter, 1895); Papua New Guinea, CRRF coll.
Etymology. The name of the new species reflects its sedentary body form.
Description of female. Body ( Fig. 148 View FIG A-C) small, curved dorsally, appearing posteriorly truncated sedentary in lateral view ( Fig. 148C View FIG ). Body length 522 μm; maximum width 230 μm (across second pedigerous somite). Cephalic shield distinct from first pedigerous somite, 133×161 μm. Trunk obscurely segmented ( Fig. 148C View FIG ), but somites distinctly defined by deep lateral constrictions. First to fourth pedigerous somites each with well-developed tergite dorsally; tergite of first pedigerous somite simple, but those of second to fourth pedigerous somites forming paired posterolateral tergal folds ( Fig. 148A View FIG ). First to fourth pedigerous somites each with single mid-ventral interpodal protrusion ( Fig. 148B View FIG ). Genitoabdomen ( Fig. 148D View FIG ) unsegmented, much wider than long in lateral view; anal prominence large ( Fig. 148D View FIG ). Caudal rami ( Fig. 148E View FIG ) originating close to each other, directed ventrally, arising on ventral margin of genitoabdomen ( Fig. 148D View FIG ) but not articulated at base, about 1.8 times longer than wide (25×14 μm); armed with 2 or 3 minute setae. Egg sac containing 5 or 6 eggs; each egg 145 μm in diameter.
Rostrum absent. Antennule ( Fig. 148G View FIG ) 40×25 μm, unsegmented, but distinctly divisible into broad proximal part and short, narrow distal part; proximal part armed with 4 setae distally and 1 small tubercle subdistally; distal part occupying 20% length of antennule, armed with 3 setae on distal margin. Antenna ( Fig. 148H View FIG ) incompletely 2- segmented, about 2.1 times longer than wide; proximal segment unarmed; distal segment armed with 6 large setae, lengths of setae I-VI (medial to lateral) increasing 19, 32, 34, 36, 48, and 61 μm, respectively; setae IV-VI longer than width of segment at tip.
Labrum ( Fig. 148I View FIG ) broad with convex lateral margins, ornamented with patches of minute spinules on ventral surface; palp spinulose, curved laterally, with narrow proximal quarter and moderately expanded distal three-quarters. Mandible spinulose, narrower than labral palp. Precoxa ( Fig. 148J View FIG ) of maxillule with bifurcate apex, and endite bearing slender, spinulose spine and more than 10 thin spinules; palp ( Fig. 148K View FIG ) armed with 6 subequal spinulose spines along convex distal margin. Maxilla ( Fig. 148L View FIG ) 2-segmented; proximal segment bearing 1 smooth tubercle proximally on medial margin and mediodistal endite tipped with spinulose element; distal segment smooth, tapering, with 1 tubercle on anterior surface and 1 seta on posterior surface. Maxilliped absent.
Legs 1-4 each consisting of 2-segmented protopod (coxa and basis) and unsegmented rami ( Fig. 149A, B View FIG ); basis with outer seta. Exopods with proximal patch of spinules on lateral margin. Endopods less than twice as long as wide, 31×21, 31×20, 31×18, and 25×15 μm, respectively, in legs 1-4. Distal setae on endopods distinctly longer than endopodal segments. Laterodistal and mediodistal setae 67 and 59, 71 and 56, 42 and 42, and 40 and 33 μm, respectively, in legs 1-4. Laterodistal setae distinctly longer than mediodistal setae in legs 1, 2, and 4, but equal in length in leg 3.
Leg 5 ( Fig. 149C View FIG ) more than twice as wide as long (63×150 μm); armed with 2 minute setae on distal margin; separated by distance of 87 μm.
Male. Unknown.
Remarks. The posteriorly-truncated body, with its ventrally directed abdomen, is an extraordinary body form for the genus bnterçcçla, and serves to characterize bK sedentarẚus sp. nov. In addition, about half of known congeneric species have a laterodistal seta on the endopod of leg 1 that is as long as or longer than the endopodal segment, but in none of these is the laterodistal seta more than twice as long as the endopodal segment as in b. sedentarẚus sp. nov.
The caudal rami of b. sedentarẚus sp. nov. are armed with 2 or 3 setae. Although the setae are minute, this feature is remarkable because caudal rami of bnterçcçla species that are known to be setiferous, i.e. b. ẚanthẚnus, b. latẚceps, and b. setẚcaudus sp. nov., only ever have a single caudal seta. The antennules of b. sedentarẚus sp. nov. are armed with 7 setae ( Table 6 View TABLE 6 ). This setation is shared with three known species, b. sydnẚẚ, b. setẚcaudus sp. nov., and b. australẚs sp. nov. but none of these species shares the ventrally-directed abdomen that is diagnostic for b. sedentarẚus 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.