Notodelphys steinitzi Stock, 1967
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publication ID |
https://doi.org/ 10.11646/megataxa.4.1.1 |
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DOI |
https://doi.org/10.5281/zenodo.5661641 |
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persistent identifier |
https://treatment.plazi.org/id/03C487CB-EF75-3A1D-FF4D-FAFFFD72FA8A |
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treatment provided by |
Plazi |
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scientific name |
Notodelphys steinitzi Stock, 1967 |
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Notodelphys steinitzi Stock, 1967
( Figs. 21–23 View FIGURE 21 View FIGURE 22 View FIGURE 23 )
Material examined. 12 ♀♀, 2 ♂♂ (MNHN-IU-2018- 1774) and dissected 1 ♀, 1 ♂ (figured) from Ascidia fictile Monniot C., 1997 , Madagascar, Plante coll.; 1 ♀, 1 ♂ (MNHN-IU-2018-1775) from A. fictile, MUA 20, Nosy Be, Madagascar, Laboute coll.; 3 ♀♀, 3 ♂♂ (MNHN-IU-2018-1776) from A. fictile, MUA 20, Nosy Be, Madagascar, Laboute coll.
Supplementary description of female. Body ( Fig. 21A View FIGURE 21 ) dorsoventrally depressed, 1.62 mm long. First pedigerous somite narrower than other prosomal somites: tergites of second and third pedigerous somites with angular posterolateral corners. Brood pouch wider than long, slightly narrowing distally, with weakly convex lateral margins. Freeurosome ( Fig. 21B View FIGURE 21 ) consistingof genitalsomiteand 4 abdominalsomites, 45×125, 67×127, 58×127, 51×127, and 45×127 μm, repectively; lateral margins of abdomen parallel. Caudal ramus about 1.7 times as long as wide (91×55 μm), rectangular, surface covered by dense ornamentation of transparent scales and thin setules; armed with 6 pinnate setae, all located distally.
Rostrum ( Fig. 21C View FIGURE 21 ) tapering, longerthanwide, with truncate, slightly concave distal margin bearing spinulose lobe. Antennule ( Fig. 21D View FIGURE 21 ) slender, longerthan cephalosome, 15-segmented; armatureformula 3, 6, 12, 6, 4, 2, 2, 2, 1, 1+aesthetasc, 1, 1, 2, 2, and 7+aesthetasc; most of setae on proximal 5 segments pinnate, other setae on distal segments naked (as figured). Antenna ( Fig. 21E View FIGURE 21 ) slender, with short, obscure coxa; basiswith long pinnate seta and short naked setae representing exopod; first endopodal segment slightly shorter than basis, with 1 seta subdistally on inner margin and fine spinules on outer margin; compound distal endopodal segment elongate, about 7.6 times as long as wide (174×23 μm), ornamented with longitudinal row of minute spinules along outer margin: armed with small terminal claw and 11 setae (grouped as 1, 1, 3, 1, 2, and 3), distal 3 of which claw-like, pointed at tip.
Labrum ( Fig. 21F View FIGURE 21 ) narrowing distally, setulose along posterior margin, with indistinct posteromedian lobe bearing fine spinules. Mandible ( Fig. 21G View FIGURE 21 ) with 5 teeth (distal 2 acutely pointed) and 2 proximal setae on coxal gnathobase; basiswith 1 setaonmedial margin; exopod 2-segmented with 1 and 4 setae on first and second segments, respectively, distalmost seta distinctly longer than others; endopod with 2 and 9 setae on first and second segments, respectively; first endopodal segment ornamented with spinules on medial margin. Maxillule ( Fig. 21H View FIGURE 21 ) armedwith 10 setaeon arthrite, 1 setaon coxal endite, 2 setaeon epipodite, and 3 setae (proximal one smaller) on medial margin of basis; exopod with 4 setae, all apparently united at base; endopod incompletely 2-segmented and armed with 1 and 4 setae on first and second segments, respectively, 3 distal setae longer and naked. Maxilla ( Fig. 22A View FIGURE 22 ) 5-segmented; syncoxawith 9 enditic setae, arranged as 3, 1, 2, and 3; basis with long, strongly arched claw plus 2 setae; endopod with 1, 1, and 3 setaeon firsttothird segments, respectively. Maxilliped ( Fig. 22B View FIGURE 22 ) 3-segmented and armed with 9, 1, and 3 setae on first to third segments, respectively.
Legs 1–4 biramous with 3-segmented rami ( Fig. 22 View FIGURE 22 C–E). Inner seta on coxa and outer seta on basis pinnate in legs 1–3 but naked in leg 4 ( Fig. 22E View FIGURE 22 ). Number of armature elements as usual for genus, but exopod of leg 4 armed only with setiform elements. Inner distal spine on basis of leg 1 straight, narrow, and as long as first endopodal segment.
Leg 5 ( Fig. 22F View FIGURE 22 ) 2-segmented; protopod broad but short, with smooth, tapering outer distal process tipped with 1 naked seta; exopod about 1.2 times longer than wide (22×19 μm), distinctly shorter than outer distal process of protopod, with narrow base, convex outer margin, and armed with shorter inner margin seta and longer distal seta, both setae naked.
Supplementarydescriptionofmale. Body ( Fig. 23A View FIGURE 23 ) narrowerthan female, 916 μm long. Tergites of second to fourth pedigerous somites with rounded posterolateral corners. Urosome ( Fig. 23B View FIGURE 23 ) 6-segmented: fifth pedigerous somite free, 132 μm wide; genital and 4 abdominalsomites 64×121, 45×112, 38×105, 35×100, and 36×97 μm, respectively. First abdominal somite ornamented with transverse row of spinules in middle of ventral surface. Caudal ramus about 1.7 times as long as wide (73×42 μm), armed and ornamented as in female.
Rostrum asin female. Antennule ( Fig. 23C View FIGURE 23 ) 11- segmented, segmental fusion pattern: I-II, III-V, VI-XI, XII, XIII, XIV, XV-XVII, XVIII, XIX-XX, XXI-XXIII, XXIV-XXVIII: geniculate between ninth ( XIX-XX) and tenth ( XXI-XXIII) segments; armature 3, 5, 12, 2, 2, 2, 5, 2, 2+aesthetasc, 2+aesthetasc, and 10+aesthetasc; nearly all setae naked. Antenna, mouthparts, and legs 1–4 as in female.
Leg 5 ( Fig. 23D View FIGURE 23 ) represented by 1 seta on posterolateral corner of fifth pedigerous somite and free exopodal segment, 18×16 μm, shaped as in female. Leg 6 ( Fig. 56D View FIGURE 56 ) represented by 2 equal, naked setae and 1 minute, inner spinule on posterior margin of genital operculum.
Remarks. Stock (1967) described this species as an associate of Phallusia nigra Savigny, 1816 (as Ascidia nigra ) collected on the Red Sea coast in the Dahlak Archipelagoandinthe Sheikh Said Channel near Massawa, Ethiopia. Most of the features given in his description are confirmed from our specimens except the plumosity of some of the setae on certain appendages. The dense covering of transparent scales on the caudal rami was overlooked by Stock (1967). Ascidia fictile is a new host record for this copepod and its discovery in Madagascan waters represents a significant extension of its known range along the Indian Ocean coast of East Africa.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.