Tubipedia anisocladia, 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 : 580-582

Tubipedia anisocladia gen. et sp. nov.

( Figs. 389 , 390 )

Type material. Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21424 ) from an unknown host, AURACEA 1995 Stn P15, near the lighthouse , Ibo Island, Mozambique, depth 0-20 m, Monniot coll., 14 November 1995.

Etymology. The name of the new species is derived from the Greek anis (=unequal) and clad (=a branch), alluding to the extremely unequal sizes of the exopods and endopods of swimming legs.

Descriptionoffemale. Body ( Fig. 389A ) elongate, length 2.03 mm. Prosome curved dorsally, dorsoventrally depressed, gradually broadening posteriorly in dorsal and ventral view, unsegmented, but with several transverse wrinkles present dorsally. Cephalosome ( Fig. 389C ) small, free margins rounded in dorsal view. Legs 1 and 2 positionedanteriorly on metasome ( Fig. 389D ). Leg 3 positioned distant from leg 2, and leg 4 widely separated from leg 3 ( Fig. 389A ). Fused third and fourth pedigerous somites forming brood pouch. Free urosome ( Fig. 389B ) small, occupying 20% ofbodylength, 5-segmented, distinctly narrowing posteriorly. Genital somite short but broadest. Caudalramus ( Fig. 389E ) 1.5 timeslongerthan wide (60×40 μm), rounded distally; armedwith 5 small setae (1 lateral and 4 distal).

Rostrum ( Fig. 389F ) small, longerthanwide, with nearly parallel lateral margins and rounded distal margin. Antennule ( Fig. 389G ) small, 77 μmlong, 5-segmented; second segment subdivided by incomplete suture on one surface; armatureformula 2, 16, 3, 1, and 11+aesthetasc; allsetae naked.Antenna ( Fig. 389H )slender, 4-segmented, consistingof coxa, basis, and 2-segmented endopod; coxa and basis unarmed; first endopodal segment longer than basis and armed with 1 seta on inner margin; distal endopodal segment slightly longer than first, 3.4 times longerthanwide (27×8 μm); armedwith 4 setae (2 minute setae at middle of inner margin, 1 subdistal, and 1 distal) plus slender terminal claw, 0.6 times as long as segment.

Labrum missing. Mandible ( Fig. 389I ) coxa with 4 teeth on medial margin of gnathobase, proximal 2 blunt and positioned close to each other: palp consisting of basis, exopod and 2-segmented endopod; basis lacking seta; exopodwith 4 setae (proximalmost slightlylonger than other 3); endopod incompletely articulated from basis and incompletely 2-segmented with 4 setaeon first segment and 6 setae on second; medial margin of first endopodal segment projecting. Maxillule ( Fig. 389J ) bilobed; medial lobe (precoxal arthrite) with 1 naked and 4 plumose setae; outer lobe (palp) broader with 6 naked setae. Maxilla ( Fig. 389K ) short, broad, indistinctly 5- segmented; armedwith 3, 2, 1, 1, and 2 setaeonfirst to fifth segments, respectively. Maxilliped ( Fig. 389L ) lobate, bearing 7 naked setae and 1 broad, pinnate seta.

Legs 1–4 biramous ( Fig. 390 A-C), with endopods markedly smaller than exopods; protopod of leg 1 incompletely 2-segmented, but those of legs 2–4 unsegmented; first exopodal segment of all legs inflated. Leg 1 with large outer seta on basis; both rami 2- segmented. Legs 2–4 with 3-segmented exopods and 1- segmented endopods. Third exopodal segment of legs 2–4 tipped with small tube at tip. Leg 3 not differing from leg 2. Armature formula for legs 1–4 as follows:

	Protopod	Exopod	Endopod
Leg 1	1-0	1-0; 1, I, 3	0-0; 2
Legs 2 & 3 0-0		1-0; 0-0; 0	2
Leg 4	0-0	0-0; 0-0; 0	1

Leg 5 ( Fig. 389B ) represented by 2 small setae at posteroventral corners of prosome. Leg 6 absent.

Male. Unknown.

Remarks. Tubipedia anisocladia gen. et sp. nov. was collected together with Procampodelphys nodosus gen. et sp. nov. (see below) from the same host at the same locality.

Figures

FIGURE 389. Tubipedia anisocladia gen. et sp. nov., female. A, habitus, right; B, urosome, dorsal; C, anterior part of prosome, dorsal; D, same, right; E, right caudal ramus, dorsal; F, rostrum; G, antennule; H, antenna; I, mandible; J, maxillule; K, maxilla; L, maxilliped. Scale bars: A, 0.2 mm; B–D, 0.1 mm; E, 0.02 mm; F–L, 0.01 mm.

FIGURE 390. Tubipedia anisocladia gen. et sp. nov., female. A, leg 1; B, leg 2; C, leg 4. Scale bars: 0.02 mm.