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 Socotradelphys unipedata gen. et sp. nov. ( Fig. 443 ) Typematerial . Holotype (intact ♀ , MNHN-IU-2009- 5058 ) , paratype (intact ♀ , MNHN-IU-2014-21468), anddissectedparatype ( ♀ , figured) from Didemnum sp. (MNHN-IT-2008-3381 = MNHNA 2/DID.C/581), Socotra Island , Yemen , Monniot coll., September 1996 . Etymology . The specific name refers to the presence of only a single pair of legs in the new species. Descriptionoffemale . Body ( Fig. 443A ) maggotshaped, graduallybroadeningposteriorly, consistingof unsegmented prosome and small, rudimentary urosome, with thin, soft epidermis. Bodylength 2.12 mm; body width 0.65 mm across widest region in posterior 20% of body. Body surface ornamented with sparsely scattered, fine spinules. Cephalosome ( Fig. 443B ) with pair of swollen, lateral processes; processes bulbous, gradually broadening distally, directed ventro-medially, extending to level of tip of labrum. Urosome ( Fig. 443C ) indistinctly 2-segmented, positionedondorsal surfaceof prosome near posterior end; first somite obscure, fused with prosome; second wider than long (77×94 μm), bilobed posteriorly, with deep posteromedian incision in rear margin; ornamented with scattered spinules. Caudal rami small, lobate, 19×14 μm, indistinctly articulated from abdomen, unarmed but ornamented with several spinules. Rostrum and antennules absent. Antenna ( Fig. 443D ) extremely small, 2-segmented, positioned between base of labrum and ventrolateral lateral processes ( Fig. 443B ); secondsegment subdivided by lateral constriction, tipped withsmall claw. Labrum ( Fig. 443B ) large, longerthan wide, tapering towards rounded apex. Mouth visible beneath labrum ( Fig. 443B ). Mouthparts absent. Leg 1 represented by paired globular lobes positioned close to each other on mid-ventral surface, posterior to apex of labrum ( Fig. 443B ). Legs 2–5 absent. Male . Unknown.