Monnioticopa minuta Kim &amp; Boxshall 2021, gen. et sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Cyclopoida
Enteropsidae
Monnioticopa
Monnioticopa minuta

description: <i>Monnioticopa minuta</i> gen. et sp. nov. (Figs. 167, 168) <b>Type material.</b> Holotype ♀ (MNHN-IU-2014-21576) and paratype ♀ (dissected, MNHN-IU-2014-21482) from <i>iẚssçclẚnum badẚum</i> Monniot F. &amp; Monniot C., 1996 (MNHN-IT-2008-4913); Papua New Guinea, N tip of Normanby I., pinnacle W of Observation Point, CRCHO 516, (09°44.59´S, 150°43.01´E), depth 36 m, CRRF coll., 16 January 2002. <b>Etymology.</b> The name of the new species refers to its relatively small body. <b>Description of female.</b> Body (Fig. 167A, B) relatively small; body length 636 μm; maximum width 192 μm (across third pedigerous somite). Cephalic shield short, more than twice as wide as long (74×164 μm), with indis- tinct posterodorsal margin. Trunk unsegmented with 3 faint transverse sclerotization bands between 4 anterior pedigerous somites; second to fourth pedigerous somites bearing weak tergal folds dorsolaterally, but without ventral interpodal protrusions; fifth pedigerous somite narrower than anterior part of trunk. Genitoabdomen (Fig. 167C) 4-segmented; 3 free abdominal somites 25×58, 22×50, and 28×47 μm, respectively, ornamented with many rows of minute spinules on ventral surface. Anal somite with 3 transverse rows of minute spinules on lateral surfaces; anal prominence distinct, with longitudinal row of minute spinules on each lobe. Caudal ramus (Fig. 167D) nearly rectangular, nearly twice as long as wide (37×19 μm); ornamented with transverse rows of minute spinules on ventral surface; armed with 1 dorsal seta (25 μm long) at 65% of ramus length, and 4 wart-like, rudimentary setae subdistally on dorsal margin. Rostrum (Fig. 167F) small, semicircular, bearing pairs of sensilla subdistally and proximally. Antennule (Fig. 167F) 51 μm long, incompletely 2-segmented; proximal segment armed with 1 seta on anterior margin; distal seg- ment narrower and slightly shorter than proximal segment, armed with 8 setae grouped as 3, 1, and distal 4. Antenna (Fig. 167G) elongate, about 42 μm long, digitiform, 3-segmented; distal segment broader than proximal segments, with minute spinules on apical surface. Labrum (Fig. 167E) unornamented; lacking palps. Mandible (Fig. 167H) unsegmented, tipped with powerful claw 25 μm long. Maxillule (Fig. 167I) bilobed; larger inner lobe tipped with spinulose seta and densely pigmented area along medial side; smaller outer lobe tipped with 1 thin, naked seta. Maxilla (Fig. 167J, K) bilobate, with longer inner lobe (endite of syncoxa) tipped with 1 seta; shorter outer lobe with 3 unequal setae (2 distal and 1 subdistal). Maxilliped absent. Legs 1-4 each consisting of 2-segmented protopod, 2-segmented exopod, and unsegmented endopod; basis with small outer seta. Legs 1, 2, and 4 same in form and armature; distal exopodal segment tipped with small claw and circular element (Fig. 168A). Exopod of leg 3 (Fig. 168B) with large spiniform process on laterodistal margin. Endopods of legs 1-4 with 2 unequal, naked setae distally; laterodistal seta about 1.5 times longer than mediodistal seta. Mediodistal seta as long as or slightly longer than endopodal segment. Leg 5 (Fig. 168C) lamellate, as long as wide (100×100 μm), narrowed proximally; armed with 2 small setae on distal margin. <b>Male.</b> Unknown. <b>Remarks.</b> <i>Mçnnẚçtẚcçpa mẚnuta</i> <b>gen. et sp. nov.</b> is distinguishable from the type species of the genus by the following features: (1) the caudal rami are 1.95 times longer than wide (vs. 1.47 times in the type species); (2) the proximal segment of the antennule is armed with 1 seta (vs. 2 setae in the type species); (3) the coxa of the swimming legs is not expanded (vs. expanded, disc-shaped); (4) the basis of swimming legs 1-4 is armed with an outer seta (vs. unarmed in the type species); and (5) leg 5 narrows proximally (vs. not narrowed).
description: Published as part of <i>Kim, Il-Hoi &amp; Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, pp. 1-286 in Zootaxa 1</i> on pages 254-256, DOI: 10.11646/zootaxa.4978.1.1, http://zenodo.org/record/4820443