Contoura globosa, 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 : 566-568

Contoura globosa gen. et sp. nov.

( Figs. 379 , 380 )

Typematerial. Holotype (intact ♀, MNHN-IU-2009-5056 ) , paratypes (10 intact ♀♀, MNHN-IU-2014-21416), and dissected paratypes (2 ♀♀, figured) from Aplidium antillense (Gravier, 1955) (MNHN-IT-2008-170 = MNHN A1/ APL.B/166), St. François, S Grande Terre, Guadeloupe, Monniot coll., 25 December 1980.

Additional material. 12 ♀♀ (MNHN-IU-2018- 1911) from A. antillense, St. François , Guadeloupe.

Etymology. The specific name is derived from the Latin glob (=a ball), referring the spherical body of the adult female of the new species.

Descriptionoffemale. Body ( Fig. 379A, B ) swollen with almost spherical brood pouch; body length 3.03 mm in dissected specimen. Prosome obscurely divided by 4 constrictions or wrinkles demarcating cephalosome and metasome; cephalosome small, narrower than anterior pedigerous somites. Fourthpedigerous somite (brood pouch) extremely expanded, spherical, 2.02×1.89 mm. Urosome ( Fig. 379C ) rudimentary, very small, 2- segmented: first urosomite short, notarticulated from prosome, with traces of 2 or 3 suture lines on surface; second urosomite narrowing posteriorly. Caudal rami completely fused to anal somite, wider than long and narrowing distally, unarmed but ornamented with minute setules on surfaces.

Rostrum ( Fig. 379D, E ) large, 135×85 μm, tapering, bluntly tipped, with minute spinules on ventral surface. Antennule ( Fig. 379F ) 71×83 μm, shortand broad, leaf-like, with 3 partial sutures (or constrictions) along posterior surface, armed distally with 5 or 6 small setae, ornamented with minute spinules on all surfaces. Antenna ( Fig. 379G ) stout, 3-segmented; coxa very short; basis 66×54 μm, unarmed; unsegmentedendopod much narrowerthan proximal segments, 50×31 μm; armed with 1 smallseta distally plus small terminal claw.

Labrum ( Fig. 379H ) broad, bilobate at each posterolateral corner, outer posterolateral lobe fringed with fine spinules along distal margin; ornamented with patch of minute spinules in mid ventral surface. Mandible ( Fig. 379I ) with coxal gnathobase broadening out towards oblique medial margin; margin serrate, with protruded proximal, pectinate part: palp reduced and unsegmented, with small, outer knob (vestige of exopod) in middle, bearing 1 or 2 minute setae; distal half (endopodal region) narrowing, bearing 2 small subdistal setae on medial margin, 2 or 3 minute setae apically; with few small spinules on medial surface. Maxillule consisting of precoxa and palp: precoxa ( Fig. 380A ) with patch of minute setules proximally and bearing 3 strong, spiniform teeth on mediodistal arthrite: palp ( Fig. 380B ) distally bilobed; outer lobe (exopod) with 2 smallsetae apically and 3 small spinules subdistally; inner lobe (basis+endopod) broad, with 1 large seta subdistally on medial margin and 4 tubercles apically, 3 outer tubercles each tipped with 1 small seta. Maxilla ( Fig. 380C ) 4- segmented, consistingof syncoxa, basis, and 2-segmented endopod; syncoxawith 1 seta medially; basis drawn out to massive, curved claw bearing 1 seta proximally and 2 rows of denticles along distal part of convex proximal margin; endopod small, with broad seta on first segment and 1 broad and 2 small setae on second. Maxilliped ( Fig. 380D ) represented by small lobe tipped with 1 seta

Leg 1 ( Fig. 380E ) as broad plate bearing blunt outer distal lobe (exopod) and ornamented with minute spinules scatteredonventral surface.Leg 2 ( Fig.380F ) assmalllobe tipped with 3 minute, nipple-like processes (rudimentary setae) and ornamented with several minute spinules. Legs 3 and 4 absent. Leg 5 ( Fig. 380G ) represented by pair of conical, highly sclerotized processes.

Male. Unknown.

Remarks. The host of the new species, Aplidium antillense , is distributed in the western Atlantic from Georgia ( United States of America) in the north to Brazil in the south ( Sanamyan & Gleason, 2009; Da Rocha et al., 2012).

Figures

FIGURE 379. Contoura globosa gen. et sp. nov., female. A, habitus, dorsal; B, habitus, right; C, urosome, ventral; D, cephalic region, ventral; E, rostrum; F, antennule; G, antenna; H, labrum, dorsal; I, mandible. Scale bars: A, B, 0.5 mm; C–E, H, 0.05 mm; F. G, I, 0.02 mm.

FIGURE 380. Contoura globosa gen. et sp. nov., female. A, precoxa of maxillule; B, palp of maxillule; C, maxilla; D, maxilliped; E, leg 1; F, leg 2; G, leg 5 pair. Scale bars: A–F, 0.02 mm; G, 0.05 mm.