Monnioticopa prima, Kim & Boxshall, 2021

Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, Zootaxa 1, pp. 1-286 : 251-254

publication ID	https://doi.org/ 10.11646/zootaxa.4978.1.1
publication LSID	lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93
DOI	https://doi.org/10.5281/zenodo.10530971
persistent identifier	https://treatment.plazi.org/id/3729879B-FF1F-FF0A-FA93-F983D4F01E4B
treatment provided by	Plazi
scientific name	Monnioticopa prima
status	gen. et sp. nov.

Treatment

Monnioticopa prima gen. et sp. nov.

( Figs. 165 View FIG , 166 View FIG )

Type material. Holotype ♀ (MNHN-IU-2014-21574), 2 ♀♀ paratypes (MNHN-IU-2014-21575), and 2 ♀♀ para- types (dissected, MNHN-IU-2014-21481) from Cystçdytes sp. (MNHN-IT-2008-2621 = MNHN A3 View Materials / CYS/135 ); The Philippines, OCDN 5119 -X, (09°31.02´N, 123°40.83´E), depth 10 m, CRRF coll., 15 April 1997. GoogleMaps

Etymology. The name is derived from the Latin prẚm (=first), indicating that it is first described species in the genus.

Description of female. Body ( Fig. 165A, B View FIG ) eruciform, stout; body length 916 μm; maximum width 364 μm (across third pedigerous somite). Cephalosome short, twice as wide as long (113×236 μm), not articulated from trunk, but defined by lateral constrictions. Trunk gradually broadening posteriorly; first to fourth pedigerous somites defined from one another by lateral constrictions and wrinkles; each somite with small, weak dorsolateral tergal folds ( Fig. 165A View FIG ), but lacking ventral interpodal protrusions. Fifth pedigerous somite completely fused with fourth. Genitoabdomen directed dorsally, indistinctly segmented dorsally, but distinctly 4-segmented ventrally.Anal somite ( Fig. 165C View FIG ) ornamented with 2 to 4 transverse rows of minute spinules on lateral surfaces and patch of minute spinules on each side of anal prominence; anal prominence large, bilobed, with patch of minute spinules near apex of lobes. Caudal ramus ( Fig. 165C View FIG ) rectangular, about 1.5 times longer than wide (44×30 μm), with rounded mediodistal protrusion, and ornamented with numerous minute spinules on surfaces of distal two-thirds of ramus; armed with 1 prominent dorsal seta (17 μm long) at 70% of ramus length and 3 minute, spinule-like setae on distal margin. Egg sac ( Fig. 165D View FIG ) 396×189 μm, fusiform; each egg about 100 μm in diameter.

Rostrum ( Fig. 165E View FIG ) well-developed, semicircular, unornamented. Antennule ( Fig. 165F View FIG ) 79 μm long, narrow, 2-segmented; proximal segment armed with 2 small setae; distal segment slightly longer than proximal segment, armed with 8 setae (4 on anterior margin and 4 on apex), 2 of distal setae distinctly larger than other setae, longest 20 μm long. Antenna ( Fig. 165G View FIG ) 65×13 μm, elongate, digitiform, 3-segmented, unarmed, but ornamented with few minute granules on 2 distal segments; lengths of first to third segments 25, 21, and 19 μm, respectively; third segment blunt with rounded apex.

Labrum ( Fig. 165H View FIG ) simple, subcircular, lacking palp, unornamented. Mandible ( Fig. 165I View FIG ) as massive claw, 37×24 μm, tapering, sclerotized, slightly curved, with subcircular unsclerotized region proximally. Maxillule ( Fig. 165J View FIG ) bilobed; larger inner lobe tipped with broad, spinulose seta; small outer lobe tipped with small, naked seta. Maxilla ( Fig. 165K, L View FIG ) bilobate; longer inner lobe (endite of syncoxa) tipped with 1 broad, naked seta; shorter outer lobe armed with 3 broad, naked setae (2 distal and 1 subdistal) of unequal sizes. Maxilliped absent.

Legs 1-4 ( Fig. 166 View FIG A-D) each consisting of unarmed 2-segmented protopod and unsegmented rami; coxa expanded, plate-like; basis with patches of minute spinules on medial side of anterior surface. Exopods shorter than endopods, tipped with 1 claw-like element and circular membranous element. Exopod of leg 3 armed with 1 elongate, acute spine originating in middle of lateral margin and extending to apex of ramus; exopod of leg 4 with small notch in middle of lateral margin. Endopods armed with 2 naked setae distally and with unsclerotized region at proximal third of medial side. Sizes of endopods 38×19, 57×27, 64×31, and 67×33 μm, respectively, in legs 1-4. Lengths of laterodistal and mediodistal setae of endopods 62 and 44, 59 and 40, 72 and 50, and 77 and 57 μm, re- spectively, in legs 1-4.

Leg 5 ( Fig. 165M View FIG ) lamellate, subcircular, 134×138 μm, with 2 minute vestigial setae; separated by distance of 100 μm.

Male. Unknown.

Remarks. The two dissected paratypes revealed no noticeable variation, except in the ornamentation of the anal somite, with 2 transverse rows of minute spinules on lateral surfaces in one specimen, but 4 rows of spinules in another.