Contouraelliptica, Kim & Boxshall, 2020
publication ID |
https://doi.org/ 10.11646/megataxa.4.1.1 |
DOI |
https://doi.org/10.5281/zenodo.6422151 |
persistent identifier |
https://treatment.plazi.org/id/03C487CB-ED66-380C-FCEF-FA9DFE38FB63 |
treatment provided by |
Plazi |
scientific name |
Contouraelliptica |
status |
gen. et sp. nov. |
Contouraelliptica gen. etsp. nov.
( Fig. 381 View FIGURE 381 )
Type material. Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21417 ) from a colonial ascidian of Aplidium sp., Porto Belo, Santa Catarina, Brazil, da Rocha coll., 02 March 1987.
Etymology. The specific name refers to the elliptical shaped body of the adult female of the new species.
Descriptionoffemale. Body ( Fig. 381A View FIGURE 381 ) fusiform, with rudimentary free urosome; body length 2.98 mm. Cephalosome weakly defined from anterior part of prosome by indistinct dorsal suture line; greatest dorsoventral depth of prosome 1.38 mm near posterior third. Prosome-urosome boundary not defined, with fifth pedigerous and genital somites incorporated into swollen prosome. Freeurosome ( Fig. 381B View FIGURE 381 ) extremely reduced, wider than long, unsegmented, and distally incised. Leg 5 and gonopore positioned ventrodistally on prosomeurosome complex ( Fig. 381B View FIGURE 381 ). Caudal rami and caudal setae absent.
Rostrum ( Fig. 381C View FIGURE 381 ) longerthanwide (147×83 μm), widest at 40% of length, tapering distally towards blunt apex. Antennule ( Fig. 381D View FIGURE 381 ) lobate, wider than long (78×95), subcircular, bearing 3 or 4 wrinkles on posterior surface; armed with 2 small setae proximally on anterior margin and 2 setae at apex; ornamented with minute setules (or spinules) along anterior surface. Antenna ( Fig. 381E View FIGURE 381 ) narrow, probably 3-segmented; coxa and basis unarmed; endopod missing in holotype.
Labrum ( Fig. 381F View FIGURE 381 ) broad with large paired ventrolateral tubercles; tubercles digitiform distally and curved medially; ornamented with spinules; posterior margin straight and smooth. Mandible ( Fig. 381G View FIGURE 381 ) consisting of coxa and reduced palp: coxal gnathobase similar to that of C. globosa gen. et sp. nov., with serrate medial margin: palp tapering, unsegmented, bearing 3 smallsetae (or tubercles) mediodistally. Maxillule ( Fig. 381H View FIGURE 381 ) similartothatof C. globosa gen. etsp. nov., with 3 large spiniform teeth on precoxal arthrite; outer lobe of palp tipped with 1 minute setule; inner lobe with 1 large seta mediodistally and 5 apically pointed tubercles. Maxilla ( Fig. 381I View FIGURE 381 ) 4-segmented; syncoxawith 2 small setae medially; basis with 1 seta and drawn out to large claw bearing 4 teeth distally on convex proximal margin; endopod with 1 small seta on first segment and 2 very unequal setae on second. Maxilliped ( Fig. 381J View FIGURE 381 ) as small lobe tipped with 2 equal, plumose setae.
Leg 1 ( Fig. 381K View FIGURE 381 ) plate-like, unarmed and unornamented, distally bilobed, with weak inner lobe (endopod).Legs 2–4 absent.Leg 5 ( Fig. 381B View FIGURE 381 ) represented by 2 pairs of conical, sclerotized processes.
Male. Unknown.
Remarks. Contouraelliptica gen. etsp. nov. iseasily distinguished from its only congener, the type species C. globosa gen. et sp. nov., by the markedly different body form of the female. Other differences include, the unsegmented urosome (vs. 2-segmented urosome in C. globosa gen. et sp. nov.), the labrum is specialized and bears paired ventrolateral tubercles (vs. these tubercles lacking in C. globosa gen. et sp. nov.), the syncoxa of the maxilla bears a single seta (vs. 2 setae), and the maxilliped is armed with 2 setae (vs. 1 seta).
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.
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