Janstockia clavelinae, 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: 614

publication ID

http://doi.org/ 10.11646/megataxa.4.1.1



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scientific name

Janstockia clavelinae

sp. nov.

Janstockia clavelinae   sp. nov.

( Figs. 415 View FIGURE 415 , 416 View FIGURE 416 )

Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21441) anddissectedparatype (♀, figured) from Clavelina fecunda (Sluiter, 1904)   , AURACEA 1995, south of Matemo, Ibo, Mozambique, depth 15 m, Monniot coll., 17 November 1995.

Etymology. The new species is named after Clavelina   , the generic name of the type host.

Descriptionoffemale. Body ( Fig. 415A View FIGURE 415 ) vermiform, elongate, cylindrical; consistingof cephalosome, long metasome and short abdomen; body length 6.65 mm. Cephalosome ( Fig. 415B, C View FIGURE 415 ) defined but not articulated from metasome; width 0.66 mm, length 0.47 mm, with paired expanded ventral folds covered with ornamentation of minutesetules. Metasomewithweaklateralconstriction between first pedigerous somite and remaining part ( Fig. 415B View FIGURE 415 ): distances between 4 leg pairs 0.32, 1.14, and 2.42 mm, respectively and distance from leg 4 to posterior margin of abdomen 2.21 mm. Fifth pedigerous and genital somites incorporated into metasome; copulatory pore present on posteroventral surface ( Fig. 415E View FIGURE 415 ). Abdomen ( Fig. 415D View FIGURE 415 ) 157×173 μm, unsegmented, bilobed posteriorly, defined from metasome by dorsal suture line, but lacking any suture line ventrally ( Fig. 415E View FIGURE 415 ). Caudal rami not defined; 6 small caudal setae present on apex of each posterior margin lobe ( Fig. 415E View FIGURE 415 ).

Rostrum ( Fig. 415F View FIGURE 415 ) small and tapering, with narrower apical part. Antennule ( Fig. 415G View FIGURE 415 ) strongly tapering, indistinctly 3-segmented, ornamented with setules on first and second segments; first segment longer than remaining part; armature formula 0, 2+aesthetasc, and 9+2 aesthetascs. Antenna ( Fig. 416A View FIGURE 416 ) stout, 3- segmented; first segment (coxa) very broad and short, unarmed; secondsegment (basis) widerthan long, unarmed; terminal segment (endopod) produced into distal claw, armed with 4 small setae near middle.

Labrum ( Fig. 415H View FIGURE 415 ) small, semicircular. Mandible ( Fig. 416B View FIGURE 416 ) as elongate lobe bearing 3 setae distally. Maxillule ( Fig. 416C View FIGURE 416 ) broad, distally bilobed, and armed with 5 broad, plumose setae (1 on narrow outer lobe and 4 on broad inner lobe). Maxilla absent. Maxilliped (third mouthpart) ( Fig. 416D View FIGURE 416 ) 2-segmented, unarmed, covered with setules; proximal segment tapering; distal segment with tapering distal tip.

Legs 1–4 wider than long, biramous with obscurely segmented protopods and unsegmented rami; coxa unarmed, but basis with pinnate outer seta. Leg 1 ( Fig. 416E View FIGURE 416 ) with patches of fine spinules on ventral surface of coxa and inner ventrodistal surface of basis; exopod with claw-like process and 8 small setae; endopod smaller than exopodwith 6 smallsetae. Leg 2 ( Fig. 416F View FIGURE 416 ) withrow of fine spinules on ventral surface of coxa; basis smooth; exopod with strong, claw-like process and 8 small setae; endopod with 9 small setae. Leg 3 shaped and armed as in leg 2. Leg 4 also shaped as leg 2, except bearing 7 setae on both rami.

Leg 5 ( Fig. 415E View FIGURE 415 ) represented by pair of small setae on ventral surface of metasome.

Male. Unknown.

Remarks. Two species are currently known in the genus Janstockia   : J. phallusiella   from the Suez Canal and Red Sea ( Boxshall & Marchenkov, 2005; Kim I.H. et al., 2016), and J. truncata Kim I.H. & Moon, 2011   from Korea (Kim I.H. & Moon, 2011). In these two species, the trunk bears a pair of lateral wing-like expansions on the first pedigerous somite (such wing-like expansions are absentin J. clavelinae   sp. nov.), the basis of leg 1 bears a broad inner distal seta which is absent in J. clavelinae   sp. nov., the mandible is armed with 7 setae compared with 3 setae in J. clavelinae   sp. nov., the maxillule is armed with 6 or 7 setae (cf. 5 setaein J. clavelinae   sp. nov.) and some of these setae expanded and globular (cf. all setae attenuated in J. clavelinae   sp. nov.). These differences allow J. clavelinae   sp. nov. to be readily differentiated from its two congeners.