Doropygus monniotorum Kim & Boxshall 2020, sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Copepoda
Cyclopoida
Notodelphyidae
Doropygus
Doropygus monniotorum

description: Doropygus monniotorum sp. nov.
(Fig. 239, 240)
Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21320), paratypes (3 intact ♀♀, MNHN-IU-2014-21321), and dissectedparatypes (2 ♀♀, figured) from Hartmeyeria bouilloni Monniot C. & Monniot F., 1976 (Syntype MNHN-IT-2008-4551 = MNHNS 2/ HAR /2), MRAC-ULB (Musée Royal de l’Afrique Centrale et Université Libre de Bruxelles) Stn 338, Inhaca I., Mozambique (26°03’S, 32°54’E), 07 August 1969.
Additionalmaterial. 3 ♀♀ (MNHN-IU-2018-1867) from Polycarpa arenosa Monniot C. & Monniot F., 1976, Inhaca Is., Mozambique, 07 August 1969.
Etymology. The new species is named after Drs. Claude and Françoise Monniot, who collected the type specimens of this species.
Descriptionoffemale. Body (Fig. 239A) narrow, laterally compressed. Bodylength of ovigerous female 3.27 mm in dissected specimen: prosome 2.32 mm long. Dorsal cephalic shield distinctly defined. Articulations between pedigerous somites indistinct. Brood pouch (fourth pedigeroussomite) about 1.7 timeslongerthan wide, strongly tapering posteriorly in lateral view. Free urosome (Fig. 239B) slender, cylindrical, 5-segmented: genitalsomite190×282μm;4 abdominalsomites223×257, 223×236, 140×205, and 159×260 μm, respectively. Anal somite with broad and deep posteromedial incision. Caudal rami divergent, elongate; each ramus (Fig. 239C) somewhat variable in length, about 6.0 times longer than wide (418×70 μm) in figured specimen (only 5.0 times longer than wide in another dissected specimen) and 2.6 timeslongerthan anal somite; armedwith 6 rudimentary setae; 2 proximal setae located at 23 and 57% of ramus length.
Rostrum (Fig. 239D) longerthan wide, weakly tapering towards rounded apex. Antennule (Fig. 239E) about370μmlong,9-segmented;firstandsecondsegments distinctly broader than distal segments; articulations between three distal segments incomplete; armature formula 3, 17, 6, 5, 3, 2+aesthetasc, 2, 2+aesthetasc, and 7+aesthetasc; 2 setae on first segment pinnate and larger than other setae, all othersetae naked.Antenna (Fig. 239F) moderately slender, 4-segmented; coxa unarmed; basis 147×69 μm, with 2 small setae; first endopodal segment 90×58 μm, not expanded, with 1 small seta; compound distal endopodal segment about 3.3 times longer than wide (127×38 μm); armed with 7 setae plus terminal claw 74 μm long, 0.58 times as long as segment.
Labrum (Fig. 239G) asin D. pulex. Mandible (Fig. 239H) different from D. pulex in having distalmost seta on exopodal segment distinctly shorter, about 0.7 times as long as other 3 proximal setae, and in second endopodal segment bearing 9 setae. Paragnath (Fig. 239I) with semicircular lobule at outer distal corner and setulose medial margin. Maxillule (Fig. 239J), maxilla (Fig. 240A), and maxilliped (Fig. 240B) as in D. pulex.
Leg 1 (Fig. 240C) with 3-segmented rami, armed as in D. pulex. Legs 2–4 with 3-segmented exopods and 2- segmented endopods (Fig. 240D, E); endopod longerthan exopod in legs 2 and 3, but similar in length to exopod in leg 4. Inner coxal seta and inner setae on endopod of leg 4 well-developed, all pinnate. Armature formula for legs 1–4 asin D. pulex.
Leg 5 (Fig. 240F) slender: protopod notarticulated at base, with 1 small outer seta subdistally and row of minute spinules at inner distal corner; free exopodal segment 3.9 times longerthan wide (164×42 μm); armed distally with 2 setae of different thickness and length and ornamented with 3 oblique rows of minute spinules on dorsomedial surface.
Male. Unknown.
Remarks. Doropygus monniotorum sp. nov. belongs to the D. pulex complex. Differences from D. pulex are: (1) the brood pouch invariably tapers more strongly; (2) the caudal ramus is more elongate (more than 5.0 times longer than wide), and is more than twice as long as the anal somite; (3) the setae on the antennule are better developed and the 2 large setaeon first segment are pinnate; (4) the terminal claw of the antenna is 0.58 times as long as the compound distal endopodal segment; (5) the distalmost (fourth) seta on the mandibular exopod is about 0.7 times as long as the other 3 setae; and (6) the exopod of leg 5 is more slender (3.9 times longer than wide).
description: Published as part of 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), pp. 1-6 in Megataxa 4 (1) on pages 361-364, DOI: 10.11646/megataxa.4.1.1, http://zenodo.org/record/4591138