Doroixys manadoensis, 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 : 463-466

Doroixys manadoensis sp. nov.

( Figs. 306 , 307 )

	Coxa	Basis	Exopod	Endopod
Leg 1	0-0	1-I	I-1; I-1; I+2, 1, 3	0-1; 0-1; 1, 2, 3
Leg 2	0-0	1-0	1-0; 1-0; 3, 1, 5	0-0; 0-0; 1, 2, 2
Leg 3	0-0	1-0	1-0; 1-0; 3, 1, 5	0-0; 0-0; 1, 2, 1
Leg 4	0-0	1-0	1-0; 1-0; 3, 1, 4	0-0; 0

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21359 ) , paratypes (4 intact ♀♀, MNHN-IU-2014-21360), and dissected paratypes (2 ♀♀, figured) from Aplidium lineatum Monniot F. & Monniot C., 1996 (type MNHN-IT-2008-469 = MNHNA 1/ APL.B/311), CRRFOCDN1447 -I, Manado 25, northern tip of Sulawesi, Manado, Indonesia (11°45.10’N, 124°58.87’E), depth 33 m.

Etymology. The specific name refers to the type locality of the new species.

Descriptionoffemale. Body ( Fig. 306A ) stout, 1.39 mm long; prosome 1.09 mm long. Dorsalcephalic shield bearingpaired hook-like, taperingprocesses ( Fig. 306K )at posterolateral corners. Metasome unsegmented, but with dorsal folds in integument, indistinctly delimiting first and second pedigerous somites; third and fourth pedigerous somites fused, without trace of suture between them. Region of fourth pedigerous somite expanded forming almost spherical brood pouch. Free urosome ( Fig. 306B ) 5-segmented; genital and 4 abdominal somites 55×152, 48×120, 45×98, 34×86, and 54×90 μm, respectively. Caudalramus ( Fig. 306C ) about 2.4 timeslongerthan wide (68×28 μm), distal 20% of ramus pale and thinwalled, rounded distally: armed with 6 smallsetae and ornamented with scattered setules; outer and dorsal setae positioned at 56 and 63% of ramus length, respectively.

	Coxa	Basis	Exopod	Endopod
Leg 1	0-0	1-I	I-1; I-1; 2, 2, 3	0-1; 0-1; 1, 2, 3
Leg 2	0-0	1-0	1-1; 1-0; 3, 1, 5	0-0; 0-0; 0, 2, 3
Leg 3	0-0	1-0	1-0; 1-0; 3, 1, 5	0-0; 0-0; 0, 2, 1
Leg 4	0-0	1-0	1-0; 1-0; 2, 1, 5	0-0; 0, 2, 1

Rostrum ( Fig. 306D ) 95×61 μm, tapering towards blunt apex. Antennule ( Fig. 306E ) 144 μm long, 8- segmented but with articulation between 2 terminal segments incomplete; armatureformula 2, 14, 4, 3+aesthetasc, 2, 2+aesthetasc, 4, and 7+aesthetasc; all setae naked and aesthetascs short. Antenna ( Fig. 306F ) stout, 4-segmented; proximal 3 segments unarmed; basis shorter than first endopodal segment; compound distal endopodal segment 3 times longer than wide (51×17 μm) and about as long as first endopodal segment: armed with 5 smallsetae (arranged as 1, 2, and 2) plusterminal claw about half as long as distal endopodal segment.

Labrum with setulose free posterior margin and broad, setulose posteromedian lobe. Mandible ( Fig. 306H ) similar to that of D. uncinata , but second endopodal segment bearing 1 small, pinnate seta in mid-dorsal surface and outer subdistal seta relatively larger than that of D. uncinata . Maxillule ( Fig. 306I ) similartothatof D. uncinata , but 2 medial setae on endopod distinctly shorter than outer seta. Maxilla ( Fig. 306J ) 4-segmented; syncoxa with 4, 2, and 2 setae on first to third endites, respectively; basis with strong claw plus 1 seta; endopod small with 1 and 3 setae on first and second segments, respectively. Maxilliped ( Fig. 307A, B ) unsegmented, armedwith 5 or 6 setae and ornamented with patch of spinules on outer surface.

Legs 1–3 ( Fig. 307 C-E) with 3-segmented rami. Leg 4 ( Fig. 307F ) with 3-segmented exopod and 2-segmented endopod: compound distal endopodal segment of leg 4 about 3 times longer than first endopodal segment and retaining vestige of articulation in middle. Inner coxal seta absent in all swimming legs. Outer seta on basis pinnate in leg 1, but naked in legs 2–4. Inner distal spine on basis of leg 1 small, 15 μm long. Setae on leg 1 pinnate, except 3 naked setae on third exopodal segment (1 distal and 2 outer setae). All setae on legs 2–4 naked and most bluntly tipped. Three setae on tip of endopod of legs 3 and 4 very unequal in length, outermost seta shortest. Armature formula for legs 1–4 as follows:

Leg 5 ( Fig. 307G ) consistingof elongate, digitiform outer protopodal process tipped with 1 seta and tapering exopod not articulated from protopod, armed with 1 seta on outer margin and with several microspinules distally.

Male. Unknown.

Remarks. This species appears most closely related to D. ooishiae sp. nov. because only these two species have an inner seta on the first exopodal segment of leg 2. Themost salient differences between these twospecies are in the number of setae on the second endopodal segment of the mandible (6 in D. manadoensis sp. nov. vs. 5 in D. ooishiae sp. nov.), in the armature of the third endopodal segment of leg 3 (armed with 3 setae in D. manadoensis sp. nov. vs. 4 setaein D. ooishiae sp. nov.), and in the form of the rostrum (gradually narrowing distally in D. manadoensis sp. nov. compared to abruptly narrowing in distal half in D. ooishiae sp. nov.)

Figures

FIGURE 306. Doroixys manadoensis sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, left caudal ramus, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, posterolateral process of cephalic shield. Scale bars: A, 0.5 mm; B, 0.05 mm; C–K, 0.02 mm.

FIGURE 307. Doroixys manadoensis sp. nov., female. A, B, maxillipeds; C, leg 1; D, leg 2; E, leg 3; F, leg 4; G, leg 5. Scale bars: A, B, G, 0.02 mm; C–F, 0.05 mm.