Doropyguselongatus, 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 : 347-350

Doropyguselongatus sp. nov.

( Figs. 230 , 231 )

Typematerial. Holotype (intact ♀, MNHN-IU-2017- 2171 ) , paratypes (2 intact ♀♀, MNHN-IU-2014-21317), and dissectedparatype (♀, figured) from Pyura ocellata Monniot F., 2016 , N/O “Hermano Gines”, Stn CP 4386, French Guiana (05°38.4 Ń, 52°29.2 Ẃ), depth 46-47 m, MNHN - convention APA-973-1 coll., 05 August 2014.

Etymology. The specific name of the new species refers to the elongate prosome of the female.

Descriptionoffemale. Body ( Fig. 230A ) slightly bilaterally compressed, 2.64 mm long. Prosome elongate, curved ventrally; somites defined only by weak surface constrictions. Dorsalcephalic shield obscurely defined from first pedigerous somite. Brood pouch formed by fusion of third and fourth pedigerous somites, elongate, slightly curved ventrally and more than twice as long as wide in lateral view, with nearly parallel dorsal and ventral margins and almost truncate apex. Free urosome ( Fig. 230B ) slender, indistinctly 5-segmented, gradually narrowing posteriorly; genital and 4 weakly defined abdominalsomites 140×215, 152×173, 133×140, 72×118, and 88×115 μm, respectively. Caudalramus ( Fig. 230C ) about 2.9 times longer than wide (121×42 μm) and about 1.4 times longer than anal somite, narrowing distally: armed with 6 thin setae; 2 proximal setae positioned at 30 and 46% of ramus length; all setae naked and shorter than width of ramus at base.

Rostrum ( Fig. 230D ) weak, tapering, aslongas wide. Antennule ( Fig. 230E ) 250 μmlong, 9-segmented; first and second segments much broader than distal segments; armatureformula 3, 16+spine, 6, 4+aesthetasc, 4, 2+aesthetasc, 3, 2+aesthetasc, and 7+aesthetasc; setae generally long; 2 pinnate setae on each of first, second and fourth segments, and 1 on each of third, fifth and sixth segments; all other setae naked. Antenna ( Fig. 230F ) slender, 4-segmented; coxashortand unarmed; basiswith 3 small setae, 2 on tip of outer distal knob (representing exopod) and 1 on distal border; first endopodal segment unarmed; compound distal endopodal segment elongate, about 6.2 times longer than wide (130×21 μm); armed with 9 small setae plus small terminal claw, about onethirdaslongas segment.

Labrum ( Fig. 230G ) setulose oneitherside of smooth, semicircular posteromedian lobe. Mandible ( Fig. 230H ) with 5 sharpteeth oncoxal gnathobase; basis with 1 setaon medial margin; exopod unsegmented with 5 equal setae; endopod 2-segmented, incompletely articulated from basis, with 4 and 9 setae on first and second segments, respectively; both endopodal segments ornamented with patch of minute spinules at outer distal corner. Paragnath ( Fig. 230I ) as small lobe with setulose medial surface and sclerotized semicircular lobule subdistally on outer margin. Maxillule ( Fig. 230J ), maxilla ( Fig. 230K ) and maxilliped ( Fig. 231A ) asin D. martiniquensis sp. nov.

Leg 1 ( Fig. 231B ) biramous, with 3-segmented rami. Outer seta on basis broad proximally and flagellate distally. Inner distal spine on basis 53 μm long, extending to middle of second endopodal segment. Legs 2–4 ( Fig. 231 C-E) with 3-segmented exopods and 2-segmented endopods: exopod as long as endopod in legs 2 and 3, but longer than endopod in leg 4. Inner coxal seta about 1.4 times as long as endopod, extending beyond distal tip of endopod in legs 2 and 3; as long as endopod, but not extending beyond tip of endopod inleg 4. Outer seta on basis small. Inner setae on endopod shorter than in D. martiniquensis sp. nov. Armature formula for legs 1–4 as in D. martiniquensis sp. nov.

Leg 5 ( Fig. 231F ) 2-segmented: protopod similarto that of D. martiniquensis sp. nov.; free exopodal segment 4.2 times longer than wide (112×27 μm), armed and ornamented as in D. martiniquensis sp. nov., but slightly constricted in proximal quarter.

Male. Unknown.

Remarks. See the remarks section for the following species summarised in Table 8 .

Figures

FIGURE 230. Doropygus elongatus sp. nov., female. A, habitus, right; B, urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, paragnath; J, maxillule; K, maxilla. Scale bars: A, 0.5 mm; B, 0.1 mm; C–K, 0.05 mm.

FIGURE 231. Doropygus elongatus sp. nov., female. A, maxilliped; B, leg 1; C, leg 2; D, leg 3; E, leg 4; F, leg 5. Scale bars: 0.05 mm.