Paranotodelphys molgulae, 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 : 76-79

publication ID

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

DOI

https://doi.org/10.5281/zenodo.5661659

persistent identifier

https://treatment.plazi.org/id/03C487CB-EF1A-3A7B-FCEF-FEB6FF2BF871

treatment provided by

Plazi

scientific name

Paranotodelphys molgulae
status

sp. nov.

Paranotodelphys molgulae sp. nov.

( Figs. 49 View FIGURE 49 , 50 View FIGURE 50 )

Type material. Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21230 ) from Molgula pyriformis Herdman, 1881 (MNHN-IT-2008-5729 = MNHNS3/ MOL.A/149), Cruise 721 of HERO, Tierra del Fuego, Argentina (54°34’S, 064°10’W), depth 73 m, January 1952. GoogleMaps

Etymology. The new species takes its name from the generic name of the type host.

Descriptionoffemale. Body ( Fig. 49A View FIGURE 49 ) stocky, similar in form to Doropygus species. Body length 3.29 mm. Second and third pedigerous somites each with well developed dorsal tergite. Brood pouch sub-globular and incorporating fifth pedigerous somite. Free urosome ( Fig. 49B View FIGURE 49 )5-segmented:genitalsomiteand 4 abdominalsomites 200×406. 224×352, 230×321, 188×267, and 170×261 μm, respectively.Anal somite gradually narrowing posteriorly. Caudal rami divergent and slender; each ramus ( Fig. 49C View FIGURE 49 ) graduallynarrowing distally, about 5.4 times longerthan wide (295×55 μm); armed with 6 setae, all setae naked and much shorter than ramus; outer lateral seta (seta II) located at 28% of ramus length; subdistal seta (seta VII) located at 83% of ramus length.

Rostrum ( Fig. 49D View FIGURE 49 ) evenly tapering, about 1.4 times longerthan wide (164×115 μm), well defined basally, and with pointed apex. Antennule ( Fig. 49E View FIGURE 49 ) distinctly narrowing distally and 10-segmented; proximal 2 segments much broader than distal segments; armature formula 3, 16, 6, 4+aesthetasc, 1, 3, 2+aesthetasc, 1, 2+aesthetasc, and 7+aesthetasc; 2 setae on first segment and 4 setae on second segment pinnate and much larger than other setae (as figured). Antenna ( Fig. 49F View FIGURE 49 ) 3- segmented; coxa short and unarmed; allobasis with 2 equally long, weakly pinnate setae (both setae as long as freeendopodal segment) representing exopod and 1 small seta on inner margin derived from incorporated first endopodal segment; free endopod 1-segmented, about 4.4 times as long as wide (61×14 μm); armed with terminal clawplus 11 smallsetae (arranged as 1, 1, 3, 1, 2, and 3), all setae attenuated at tip, terminal claw about twice as long as segment.

Labrum ( Fig. 49G View FIGURE 49 ) with setulose posterior margin and broad posteromedian lobe ornamented with setules and spinules. Mandible ( Fig. 49H View FIGURE 49 ) with 5 teethand 2 small setae on coxal gnathobase, proximal tooth minutely bifurcate; basiswith 1 setaonmedial margin; exopod 2-segmented with 2 and 3 setae on first and second segments, respectively, all 5 setae about equal in length; endopod with 4 and 10 setae on first and second segments, respectively. Paragnath ( Fig. 49I View FIGURE 49 ) with dense setules on medial surface, lacking denticle or lobe. Maxillule ( Fig. 50A View FIGURE 50 ) with 9 setaeon arthrite; coxa indistinctly defined, with 1 setaon endite and 2 unequal setae on epipodite, smaller distal seta ( Fig. 50B View FIGURE 50 ) characteristically constricted in middle; basiswith 3 setae (2 smallproximal and 1 long distal) onmedial margin; exopodwith 4 setae distally; endopod indistinctly 2-segmented with 2 setae medially on first segment and 4 setae on second segment. Maxilla ( Fig. 50C View FIGURE 50 ) 5-segmented; syncoxawith 4 (including minute seta), 1, 2, and 3 setae on first to fourth endites, respectively; basis with claw bearing spinules along concave margin, plus 2 setae; endopodwith 1, 1, and 3 setae on first to third segments, respectively. Maxilliped ( Fig. 50D View FIGURE 50 ) incompletely 3-segmentedwith 9, 0, and 2 setae on first to third segments, respectively; 2 distal segments small; second segment ornamented with dense setules on all surfaces.

Legs 1–4 with 3-segmented rami ( Fig. 50 View FIGURE 50 E–G). Inner seta on coxa of all swimming legs pinnate and distinct. Outer seta on basis of all legs small and naked. Inner distal spine on basis of leg 1 finely spinulose, 75 μm long, as long as first endopodal segment. Exopod of legs 2–4 bearing setiform elements (not spines) on outer margin. Inner seta on first exopodal segment of leg 4 small. Armature formula for legs 1–4 as follows:

Coxa Basis Exopod Endopod
Leg 1 0-1 1-I I-1; I-1; III, I, 40-1; 0-1; 1, 2, 3
Legs 2 & 30-1 1-0 1-1: 1-1; 3, 2, 40-1; 0-2; 1, 2, 3
Leg 4 0-1 1-0 1-1; 1-1; 2, 2, 40-1; 0-2; 1, 2, 2

Leg 5 ( Fig. 49H View FIGURE 49 ) represented by 2 lobes (small outer and larger inner), each tipped with 1 naked seta.

Male. Unknown.

Remarks. Three species of Paranotodelphys are known to have an allobasis plus a 1-segmented free endopod in the antenna as in the new species ( P. furcifera , P. saccata , and P. polycarpae sp. nov.). However, these three congeners can be readily differentiated from the new species because all have 3 setae on the third maxillipedal segment in contrast to only 2 in the new species. All described species of Paranotodelphys have 2 or 3, and 7 to 9 setae on the first and second endopodal segments of the mandible, respectively, except P. longicaudata in which the setation of the mandibularendopod isunknown. Therefore, the possession of 4 and 10 setae, respectively, on these segments in the new species is a unique armature configuration within Paranotodelphys . As an additional diagnostic feature, the new species has setiform elements rather than spines, on the outer margin of the exopod of legs 2–4.

Kingdom

Animalia

Phylum

Arthropoda

SubPhylum

Tunicata

Class

Maxillopoda

Order

Cyclopoida

Family

Notodelphyidae

Genus

Paranotodelphys

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