Notodelphyopsis Schellenberg, 1922

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 : 79

Genus Notodelphyopsis Schellenberg, 1922

Diagnosis. Female body with internal brood pouch extending from anterior margin of fourth pedigerous somite backwards and incorporating fused fifth pedigerous somite. Free urosome 4-segmented in female consisting of genital double-somite and 3 free abdominal somites. Urosome 6-segmented in male. Rostrum well-developed, variable in form. Female antennule typically elongate and comprising 7 or 8 expressed segments, but with maximum of 10 segments ( Fig. 30 ); segmental fusion pattern for 7-segmented antennule: I-II, III-XI, XII-XIV, XV-XVI, XVII-XX, XXI-XXIII, XXIV-XXVIII. Male antennule typically 9- or 10-segmented; non-geniculate; segmental fusion pattern of 10-segmented antennule I-II, III-XI, XII, XIII, XIV, XV-XVI, XVII, XVIII-XX, XXI-XXIII, XXIV-XXVIII. Antenna typically consisting of coxa, basis, first endopodal segment with or without inner seta, and compound distal segment (representing fused second and third ancestral segments) bearing terminal claw; some species with allobasis (comprising basis plus first endopodal segment fused); exopod represented by 2 setae.

Mandible with well developed coxal gnathobase and biramous palp armed with 1 seta on basis, 5 setae on exopod, and 2-segmented endopod typically with 2 and 8 (rarely 10)setaeonfirstandsecond segments, respectively. Maxillule with 9 setae on arthrite, 1 on coxal endite, 2 on epipodite, and 3 or 4 onmedial margin of basis; exopod unsegmented with 4 setae distally; endopod 2-segmented or unsegmented, armed with total of 5 or 6 setae. Maxilla 5-segmented with 9 setaeonsyncoxa (enditic formula 3, 1, 2, 3); basiswith 3 setae (including 1 claw-like element); 3-segmented endopod with setal formula 1 1, 3. Maxilliped 3-segmented; first segment typically armed with 9 setae; secondsegment unarmed and typically with bulbous swelling distally; third segment with 2 or 3 setae. Legs 1–4 biramous with 3-segmented rami; armature formula typically:

	Coxa	Basis Exopod Endopod
Leg 1	0-1	1-I	I-0/1; I-1; III, I, 40-1; 0-1; 1, 2, 3
Legs 2 & 30-0/ 11-0	30-0/ 11-0	11-0	I-0/1; I-1; III, I, 50-1; 0-2; 1, 2, 3
Leg 4	0-0/1	1-0	I-0/1; I-1; II/III, I, 50-1; 0-2; 1, 2, 2

Leg 5 consisting of 2 papillae each bearing single setal element; inner, exopodal papilla rarely expressed as small free segment.

Typespecies. Notodelphyopsisfalcifera Schellenberg, 1922, by original monotypy.

Remarks. The original diagnosis of Notodelphyopsis was remarkably brief: “antennule 8-segmented, long and slender, proximal segments not swollen. Limbs short. Other characters like Paranotodelphys .” Currently these two genera are distinguished from each other by the segmentation of the free urosome which is 5- segmented in female Paranotodelphys and 4-segmented in Notodelphyopsis . The genus Notodelphyopsis currently comprises the type species, plus N. perplexa Illg, 1958 and two species originally described as species of Paranotodelphys and here transferred to Notodelphyopsis as N. illgi ( Marchenkov & Boxshall, 2003) comb. nov. and N. unguifer (Kim & Moon, 2010) comb. nov. (see above).

Figures

FIGURE 30. Schematic comparison of antennular segmentation patterns in selected notodelphyid taxa. Roman numerals mark ancestral segments, Arabic numerals indicate number of setae on each segment/compound segment. ae = aesthetasc. Supernumerary setae are identified by reference to the observed maximum setal number known within the Copepoda (see Boxshall & Huys, 1998). Supernumerary setae are present on segments III–XI, XII–XIV, XV–XVI, XXIV and XXV of Paranotodelphys polycarpae, on segments III–XI, XII, XV–XVI, XXI–XXIII, XXIV, XXV and XXVI–XXVIII of P. saccata, and on segments XVII–XX, XXI–XXIII, XXIV, and XXV of Doropygopsis novemsetifera.