Campodelphys hirsutus, 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 : 591

Campodelphys hirsutus gen. et sp. nov.

( Figs. 396 , 397 )

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21429 ) , paratype (intact ♀, MNHN-IU-2014-21430), and dissected paratypes (2 ♀♀, figured) from Apliodiopsis tubeferus Monniot C., Monniot F., Griffiths & Schleyer, 2001, ATIMO VATAE TA 12, Rocher de l’Albatros, south coast of Madagascar (25°28 Ś, 44°58 É), depth 10-12 m, MNHN coll., 18 May 2010.

	Protopod	Exopod	Endopod
Leg 1	0-0	1-0; 6	0-1; 6
Leg 2	0-0	1-0; 10	0-1; 7
Leg 3	0-0	1-0; 9	0-1; 8
Leg 4	0-0	1-0; 10	0-1; 7
Leg 5	absent.

Etymology. The specific name refers to the hirsute body (from Latin hirsut meaning “hairy”).

Descriptionoffemale. Body ( Fig. 396A ) caterpillarlike, elongate, cylindrical; body surface densely covered with fine setules. Body length 1.18 mm; maximum body width 0.20 mm; length to width ratio about 6.0. Prosome 5-segmented with weak articulations between somites; anterior part of prosome from rostrum to level of insertion of leg 4 occupying about half of total prosome length. Cephalosome ( Fig. 396B ) with paired, bluntly rounded tubercles posterolaterally on ventral surface ( Fig. 396E ). Freeurosome ( Fig. 396C ) small, curved ventrally, 5- segmented, consistingof genitalsomiteand 4 abdominal somites. Caudal rami ( Fig. 396D ) small, nearly as long as anal somite, narrowing distally, about 1.5 times longer than wide (31×21 μm), incompletely articulated from anal somite: caudal setae hardly discernible from setules, but 4 distal setae distinguishable from setular ornamentation.

Rostrum ( Fig. 396F ) large, longerthanwide, with parallel lateralmargins and rounded distal margin; densely covered with setules. Antennule ( Fig. 396G ) short and broad, aslongas wide, incompletely 3-segmented; most setae not distinguishable from setules, but 3 setae on first segment distinct. Antenna ( Fig. 396H ) stout, consisting of unarmed coxa and basis, and unsegmented endopod bearing terminal claw; basis broadened proximally, with protruding proximal outer margin; endopod twice as long as wide (30×15 μm): armed with 3 smallsetae distally plusterminal claw, about 0.7 times as long as endopod.

Labrum ( Fig. 396I ) setulose, linguiform, longer than wide, gradually narrowing towards rounded distal margin. Mandible ( Fig. 396J ) consistingof coxa and palp: coxal gnathobase simple, with slightly concave, pectinate medial margin: palp clearly segmented; basis unarmed; exopod with 4 setae and endopod with 1 and 3 setae on first and segments, respectively; all setae naked. Maxillule ( Fig. 396K ) lobate, armed with 1 large subdistal seta and 5 small distal setae. Maxilla ( Fig. 396L ) lobate, bearing 4 setae (proximalmost seta larger than distal 3). Maxilliped ( Fig. 396M ) small, incompletely 2-segmented; armed with 1 seta on second segment.

Legs 1–4 ( Fig. 397 A-D) broad and short, each with narrow intercoxal plate: all legs consisting of unsegmented protopod and 2-segmented rami; both rami stout, subequalin length. Legs separated from one another along metasome by equal gaps. Protopods unarmed, lacking seta, but usually ornamented with scatteredsetules on ventral surface. First exopodal segment of legs 1–4 bearing robust, dentiform outgrowth at outer distal corner. All setae on rami bluntly tipped, club-shaped, outer setae short, medial setae longer. Armature formula for legs 1–4 as follows:

Male. Unknown.

Remarks. Five outstanding features serve to differentiate Campodelphys hirsutus gen. et sp. nov. from its congeners described below: (1) the prosome is segmented (although the segmentation is weak it contrasts withthe unsegmentedconditioninthecongenericspecies); (2) the mandibular basis is unarmed (cf. 1 seta present on the basis); (3) the second endopodal segment of the mandible is armed with 3 setae (cf. 4 setae in congeners); (4) the maxilla is armed with 4 setae (cf. 6 or 7 setae in congeners); and (5) the basis of leg 1 lacks an inner distal seta (this seta is present in its congeners).

Figures

FIGURE 396. Campodelphys hirsutus sp. nov., female. A, habitus, right; B, anterior part of prosome, dorsal; C, urosome, right; D, caudal rami, dorsal; E, cephalosome, ventral; F, rostrum; G, antennule; H, antenna; I, labrum; J, mandible; K, maxillule; L, maxilla; M, maxilliped. Scale bars: A, B, 0.1 mm; C, E, F, 0.05 mm; D, G–I, 0.02 mm; J–M, 0.01 mm.

FIGURE 397. Campodelphys hirsutus sp. nov., female. A, leg 1; B, leg 2; C, leg 3; D, leg 4. Scale bars: 0.01 mm.