Doropygus breviuncinatus, Kim & Boxshall, 2020

Kim, Il-Hoi & Boxshall, Geoff A., 2020, Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata), Megataxa 4 (1), pp. 1-6 : 374

publication ID

https://doi.org/ 10.11646/megataxa.4.1.1

DOI

https://doi.org/10.5281/zenodo.5699861

persistent identifier

https://treatment.plazi.org/id/03C487CB-EE24-3B40-FF4D-FD03FBEBF8AD

treatment provided by

Plazi

scientific name

Doropygus breviuncinatus
status

sp. nov.

Doropygus breviuncinatus sp. nov.

( Figs. 247 View FIGURE 247 , 248 View FIGURE 248 )

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21325 ) anddissectedparatype (♀, figured) from Herdmania momus (Savigny, 1816) , Mont Dore, New Caledonia, Monniot coll.

Etymology. The specific name is derived from Latin brevi (=short) and uncinat (=hooked) and alludes to the short terminal claw of the antenna.

Coxa Basis Exopod Endopod
Leg 1 0-1 Legs 2 & 30-1 Leg 4 0-1 1-I 0-0 0-0 I-1; I-1; III, I, 4 1-1; 1-1; 3, 1, 5 1-1; 1-1; 2, 1, 5 0-1; 0-1; 1, 2, 3 0-1; 1, 3, 4 0-1; 1, 3, 3

Descriptionoffemale. Body ( Fig. 247A View FIGURE 247 ) narrow, similar in form to D. humilis . Body length 2.75 mm: prosome 2.10 mm long. Dorsalcephalic shield welldefined; metasome indistinctly segmented. Fourth pedigerous somite forming brood pouch, about 1.4 times longer than wide in lateral view, slightly shorter than anterior prosome. Freeurosome ( Fig. 247B View FIGURE 247 ) 5-segmented, cylindrical: genitalsomite 123×314 μm; 4 abdominal somites 205×282, 173×266, 155×244, and 109×216 μm, respectively. Anal somite broadened posteriorly, with deep posteromedian incision. Caudal ramus ( Fig. 247C View FIGURE 247 ) graduallynarrowing distally, about 4.2 timeslongerthan wide (284×68 μm) and 2.6 times longer than anal somite; armed with 6 very small setae; all setae less than half width of ramus at base; 2 proximal setae positioned at 27 and 62% of ramus length.

Rostrum ( Fig. 247D View FIGURE 247 ) consistingof broad proximal third (173 μm wide) and narrower tapering distal twothirds (103 μm wide). Antennule 9-segmented ( Fig. 247E View FIGURE 247 ); 2 proximal segments much broader than distal segments; setae highly entangled, generally of mediumlength, several setae sparsely pinnate. Antenna ( Fig. 247F View FIGURE 247 ) slender, 4-segmented; coxashortand unarmed; basis 120×45 μm, subdistally bearing small knob (exopod) tipped with minute vestigial seta; first endopodal segment 93×47 μm, unarmed, ornamented with patch of minute spinules near middle; compound distal endopodal segment elongate, about 4.4 times longer than wide (128×29 μm); armed with several small setae (distal 3 positioned at base of terminal claw, blunt at tip, subequal in length) plus slightly curved terminal claw ( Fig. 247G View FIGURE 247 ) with blunt tip, 55 μm long, 0.43 times as long as segment; claw ornamented with hyaline membranous fringe along concave margin and on tip.

Labrum ( Fig. 247H View FIGURE 247 ) withsemicircularposteromedian lobe; posteriormargin setulose. Mandible ( Fig. 247I View FIGURE 247 ) with 4 teeth on coxal gnathobase; palp asin D. humilis except exopod bearing 4 large setae only. Paragnath ( Fig. 247J View FIGURE 247 ) with distinct outer subdistal lobule; apical region smooth, without spinules or denticles. Maxillule ( Fig. 247K View FIGURE 247 ) as in D. humilis . Maxilla ( Fig. 247L View FIGURE 247 ) distal syncoxal endite with only 2 setae as in D. humilis . Maxilliped ( Fig. 248A View FIGURE 248 ) incompletely 2-segmented, armedwith 9 and 2 setaeon firstandsecondsegments, respectively.

Leg 1 ( Fig. 248B View FIGURE 248 ) similartothatof D. humilis but inner distal spine on basis shorter, 42 μm long, and spinulose along distal half. Legs 2–4 lacking outer seta on basis ( Fig. 248C, D View FIGURE 248 ); outer setae on second and third exopodal segments unilaterally pinnate along outer margin. Inner coxal seta of leg 4 sparsely pinnate and extending slightly beyond distal border of first endopodal segment. Third exopodal segment of legs 2–4 shorter than wide. Armature formula for legs 1–4 as follows:

Leg 5 ( Fig. 248E View FIGURE 248 ) extending slightly beyond ventrodistal border of genital somite. Protopod as in D. humilis ; exopodal segment about 2.7 times longerthan wide (111×41 μm) with wavymedial margin; armeddistally with 2 setae of 70 μm and 38 μm in length and ornamented with 3 rows of minute spinules on medial surface.

Male. Unknown.

Remarks. Doropygus breviuncinatus sp. nov. resembles D. humilis and D. parahumilis sp. nov. in having a membranous hyaline fringe on the terminal claw of the antenna, but can be readily distinguished from the latter two species by: the proportional length of the caudal ramus of D. breviuncinatus sp. nov. is longer than that of D. humilis , but shorter than that of D. parahumilis sp. nov. In addition, the terminal claw of the antenna of D. breviuncinatus sp. nov. is short (55 μm long) and truncate, in contrast to those of its two congeners, which narrow distally and are more than 70 μm long. Finally, the basis of legs 2–4 of D. breviuncinatus sp. nov. lacks an outer seta which is present, although small, in both of the other two congeneric species. Other differences are summarised in Table 9 View TABLE 9 .

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