Prodoroixys antarctica, 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 : 507-510

publication ID	https://doi.org/ 10.11646/megataxa.4.1.1
DOI	https://doi.org/10.5281/zenodo.5699915
persistent identifier	https://treatment.plazi.org/id/03C487CB-EEAB-3BC8-FF4D-FCDFFEC4FE8E
treatment provided by	Plazi
scientific name	Prodoroixys antarctica
status	gen. et sp. nov.

Treatment

Prodoroixys antarctica gen. et sp. nov.

( Figs. 336 View FIGURE 336 , 337 View FIGURE 337 )

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21384 ) , paratypes (5 intact ♀♀, MNHN-IU-2014-21385), and dissected paratypes (2 ♀♀, figured) from Synoicum salivum Monniot F. & Gaill, 1978 (MNHN-IT-2008-8621 = MNHNA 1/ SYN /28), Kerguelen Islands, MD 04 DR106 (49°00’18″S, 67°30’42’’E), “Marion Dufresne”, depth 206 m, Boury-Esnault coll., 01 March 1975.

Additional material. 13 ♀♀ (MNHN-IU-2018- 1906) and 1 dissected ♀ from Synoicum sp., Kerguelen Islands, MD 04 DR 106; 17 ♀♀ (MNHN-IU-2018- 1907) from Aplidium sp., Kerguelen Islands, MD 03 Pr 61; 14 ♀♀ (MNHN-IU-2018-1908) from Synoicum sp., Kerguelen Islands. MD 04 DR 106.

Etymology. The specific name of the new species refers to its distribution in the Antarctic.

Descriptionoffemale. Body ( Fig. 336A View FIGURE 336 ) similarto typical Doroixys , 1.09 mmlong. Prosome 0.89 mmlong, relatively narrow; dorsal cephalicshielddistinctly defined, with acutely pointed posterolateral horn-like process on each side. Metasome unsegmented, distinctly longerthan wide, graduallybroadeningposteriorly; fifthpedigerous somite completely fused with fourth. Freeurosome ( Fig. 336B View FIGURE 336 ) 5-segmented: genital somite distinctly longer and wider than abdominal somites. Surface of abdominal somites densely ornamented with setules. Caudal ramus ( Fig. 336C View FIGURE 336 ) about 2.3 timeslongerthan wide (68×30 μm) and as long as anal somite; ornamented with numerous setules: armed with 6 setae, 2 proximal setae positioned at 46% and 60% of ramus length; 4 distal setae blunt at tip; all caudal setae shorter than ramus width.

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

Rostrum ( Fig. 336D View FIGURE 336 ) 100×74 μm, tapering, setulose distally, slightly constricted at proximal third; apex rounded. Antennule ( Fig. 336E View FIGURE 336 ) 154 μm long, 9- segmented; third segment with traces of 2 articulations; armatureformula 2, 17, 5, 3+aesthetasc, 3, 2+aesthetasc, 2, 2+aesthetasc, and 7+aesthetasc; setae crowded, all naked. Antenna ( Fig. 336F View FIGURE 336 ) 4-segmented; proximal 3 segments shortand unarmed, terminal (secondendopodal) segment longest, 2.5 times longerthan wide (45×18 μm); armed with 10 setae (arranged as 1, 1, 3, 2, and 3) plusterminal claw less than half length of segment.

Labrum ( Fig. 336G View FIGURE 336 ) with denselysetulose posterior marginand posteromedial lobe. Mandible ( Fig. 336I View FIGURE 336 ) with 6 acute teeth and 2 small setae on coxal gnathobase: basiswith 1 seta medially: exopodwith 5 setae, shortest outer seta about 0.6 times as long as adjacent distal seta: endopod 2-segmented; first segment with 1 seta; second segment with 6 or 7 setae, third medial seta (indicated by arrowhead in Fig. 336I View FIGURE 336 ) present or absent. Paragnath ( Fig. 336H View FIGURE 336 ) lobate, bearing small tooth apically and setules on medial surface. Maxillule ( Fig. 336J View FIGURE 336 ) armedwith 9 or 10 setae on arthrite (small seta indicated by arrowhead present or absent), 1 each on coxal endite and epipodite, 2 on basis, 4 on exopod and 3 on endopod; setae on exopod and endopod subequal in length. Maxilla ( Fig. 337A View FIGURE 337 ) 5- segmented; syncoxa with 3, 1, 2, and 3 setae on first to fourth endites, respectively; basis with slender claw plus 2 unequal setae; endopod with 1, 1, and 3 setae on first to third segments, respectively. Maxilliped ( Fig. 337B, C View FIGURE 337 ) unsegmented elongate lobe, bearing 6 to 9 setae (3 to 6 medial and 2 or 3 apical).

Legs 1–3 ( Fig. 337 View FIGURE 337 D-F) with 3-segmented rami. Leg 4 ( Fig. 337G View FIGURE 337 ) with 3-segmented exopod and 2-segmented endopod. Endopods shorter than exopods; endopods of legs 3 and 4 small, less than half length of exopod. Inner coxal seta present only on leg 1. Inner distal spine on basis of leg 1 bilaterally serrate, 20 μm long. All setae on rami of legs 2–4 bluntly tipped. First and second exopodal segments of legs 3 and 4 lacking inner seta. Second endopodal segment of leg 3 and first endopodal segment of leg 4 lacking inner seta. Number of inner setae on second endopodal segment of leg 2 variable, 1 or 2 (usually 1, indicated by arrowhead in Fig. 337E View FIGURE 337 ). Number of setae on second endopodalsegment of leg 4 ( Fig. 337G, H View FIGURE 337 ) also variable, 2 to 4 (usually 3). Armature formula for legs 1–4 as follows:

Leg 5 ( Fig. 336B View FIGURE 336 ) located posteroventrally on somite and represented by outer protopodal papilla tipped with 1 seta and inner exopodal lobe tipped with 1 seta and 1 minute setule.

Male. Unknown.

Remarks. The armature of the second endopodal segment of the mandible, the arthrite of the maxillule, the maxilliped, and the endopods of legs 2 and 4 of the new species are variable, and are not robust taxonomic characters.