Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata) Author Kim, Il-Hoi 0000-0002-7332-0043 Korea Institute of Coastal Ecology, Inc., 802 - ho, 302 - dong, 397 Seokcheon-ro, Ojeong-gu, Bucheon, Gyeonggi-do 14449, Republic of Korea ® ihkim @ gwnu. ac. kr; https: // orcid. org / 0000 - 0002 - 7332 - 0043 ihkim@gwnu.ac.kr Author Boxshall, Geoff A. 0000-0002-7332-0043 Korea Institute of Coastal Ecology, Inc., 802 - ho, 302 - dong, 397 Seokcheon-ro, Ojeong-gu, Bucheon, Gyeonggi-do 14449, Republic of Korea ® ihkim @ gwnu. ac. kr; https: // orcid. org / 0000 - 0002 - 7332 - 0043 ihkim@gwnu.ac.kr text Megataxa 2020 2020-12-24 4 1 1 6 http://zoobank.org/3fdd970e-62f1-4f67-8cce-10870bdb3c01 journal article 54097 10.11646/megataxa.4.1.1 7c9bc39d-9910-46f1-9558-c0647b9cbbdb 2703-3090 4591138 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	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).