Socotradelphys unipedata, 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 : 653

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.

Figures

FIGURE 443. Socotradelphys unipedata gen. et sp. nov., female.A, habitus, dorsal; B, cephalic region, ventral; C, urosome; D, antenna. Scale bars: A, 0.2 mm; B, 0.1 mm; C, 0.05 mm; D, 0.01 mm.