Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata)
Author
Kim, Il-Hoi
0000-0002-7332-0043
Korea Institute of Coastal Ecology, Inc., 802 - ho, 302 - dong, 397 Seokcheon-ro, Ojeong-gu, Bucheon, Gyeonggi-do 14449, Republic of Korea ® ihkim @ gwnu. ac. kr; https: // orcid. org / 0000 - 0002 - 7332 - 0043
ihkim@gwnu.ac.kr
Author
Boxshall, Geoff A.
0000-0002-7332-0043
Korea Institute of Coastal Ecology, Inc., 802 - ho, 302 - dong, 397 Seokcheon-ro, Ojeong-gu, Bucheon, Gyeonggi-do 14449, Republic of Korea ® ihkim @ gwnu. ac. kr; https: // orcid. org / 0000 - 0002 - 7332 - 0043
ihkim@gwnu.ac.kr
text
Megataxa
2020
2020-12-24
4
1
1
6
http://zoobank.org/3fdd970e-62f1-4f67-8cce-10870bdb3c01
journal article
54097
10.11646/megataxa.4.1.1
7c9bc39d-9910-46f1-9558-c0647b9cbbdb
2703-3090
4591138
Janstockia clavelinae
sp. nov.
(
Figs. 415
,
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
) vermiform, elongate, cylindrical; consistingof cephalosome, long metasome and short abdomen; body length 6.65 mm. Cephalosome (
Fig. 415B, C
) 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
): 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
). Abdomen (
Fig. 415D
) 157×173 μm, unsegmented, bilobed posteriorly, defined from metasome by dorsal suture line, but lacking any suture line ventrally (
Fig. 415E
). Caudal rami not defined; 6 small caudal setae present on apex of each posterior margin lobe (
Fig. 415E
).
Rostrum (
Fig. 415F
) small and tapering, with narrower apical part. Antennule (
Fig. 415G
) 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
) 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
) small, semicircular. Mandible (
Fig. 416B
) as elongate lobe bearing 3 setae distally. Maxillule (
Fig. 416C
) 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
) 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
) 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
) 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
) 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.