Bathycalanus tumidus, Bradford-Grieve, Janet M., Blanco-Bercial, Leocadio & Boxshall, Geoffrey A., 2017
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publication ID |
https://doi.org/ 10.5281/zenodo.293480 |
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publication LSID |
lsid:zoobank.org:pub:BCDF8F6F-B8B4-4A9D-A8B8-7EDCEF1100BE |
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DOI |
https://doi.org/10.5281/zenodo.6029184 |
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persistent identifier |
https://treatment.plazi.org/id/03FC3969-BB11-FFD0-01BE-660AFDFA0518 |
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treatment provided by |
Plazi |
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scientific name |
Bathycalanus tumidus |
| status |
sp. nov. |
Bathycalanus tumidus n. sp.
( Figs 46 View FIGURE 46 , 67–70 View FIGURE 67 View FIGURE 68 View FIGURE 69 View FIGURE 70 )
Type locality. 29.5333o N, 137.233o E.
Material examined. Antipode IV, IKMT: Stn 52D, 0–1900 m, 1♀ (10.9 mm) holotype; Stn 53A, 0–2000 m, 2♀ (10.0, 10.5 mm) paratype; Stn 53D, 0–2500 m, 1♀ (10.2 mm). ANTXIV/1, MOC10, Stn 2, 2000–3000 m, 1♀ (9.5 mm) Co375.1.1, 1♀ (9.3 mm) Co375.1.3, paratype. MV 73-I, IKMT, Stn 53, 0–2000 m, 1♀ (10.4 mm).
Type specimens. Deposited in the collection of the Scripps Institution of Oceanography, California. Holotype female: PIC- 140409 - 0012-HT; Paratype series: PIC- 140409 -0013-PT. Deposited in the collection of the National Institute of Water and Atmospheric Research , Wellington: NIWA 85230 View Materials (Co375.1.3) 1 vial plus 1 slide.
Genetic material. Co375.1.1, Co375.1.3. GenBank numbers in Table 6.
Morphological description. Following description based on holotype specimen from Antipode IV Stn 52D. As for genus with following additional specific level features.
Female ( Fig. 67 View FIGURE 67 A–F). Total length 10.6 mm (mean = 10.11 mm, range = 9.3–10.9 mm, n = 7). Anterior margin of head, in dorsal view, produced into distinct short rounded projection located dorsal to base of rostrum and bearing pair of small stout divergent spine-like processes. In lateral view, posterolateral corners of pedigerous somite 5 symmetrical, rounded. Genital double-somite bulbous, symmetrical in dorsal view, slightly wider than long, widest width at approximately midlength, with small anteroventral genital operculum, seminal receptacles not observed.
Antennule ( Figs 67 View FIGURE 67 F, 68) lengths of antennule segments (µm) as follows. Measurements taken along posterior border of each segment but two (posterior (shortest) and anterior) measurements taken of ancestral segment I. I (327, 644); II– IV (478); V (268); VI (288); VII (673); VIII (384); IX (357); X–XI (587); XII (406); XIII (406); XIV (495); XV (618); XVI (692); XVII (766); XVIII (819); XIX (878); XX (951); XXI (998); XXII (760); XXIII (703); XXIV (782); XXV (772); XXVI (372); XXVII (-); XXVIII (-). Anterior and posterior borders of antennule ancestral segments XVI–XXI smooth.
Antenna ( Fig. 69 View FIGURE 69 A) exopod segment IV with short seta extending beyond distal border of segment VIII and bearing short setules.
Maxillule ( Fig. 69 View FIGURE 69 C) praecoxal arthrite with 15 setae including 4 on posterior surface and 2 small anterior surface setae; coxal endite with 1 seta, basal endites 1 and 2 with 2 and 4 setae respectively, basis and endopod segments 1 and 2 fused although demarcation between segments visible, segment 3 separate; endopod segments with 2 (subequal), 2 (subequal), 5+1 smaller anterior surface seta.
Maxilliped ( Fig. 69 View FIGURE 69 E) syncoxal endite 4 with large toothed seta extending half way along endopod segment 2.
Leg 1 ( Fig. 67 View FIGURE 67 G) exopod with articulation between exopod segments 2 and 3 well developed.
Male. Unknown.
Distribution. Bathycalanus tumidus n. sp. is an upper abyssopelagic species taken in the eastern and western North Pacific and the Atlantic off West Africa near the Cape Verde Islands where it was found at depths between 2000 and 3000 m ( Fig. 46 View FIGURE 46 , Table 1 View TABLE 1 ).
Species comparisons. This species is very like Ba. richardi except the genital double-somite is of a bulbous shape in dorsal view, widest at midlength and wider than long. The maxillule praecoxal arthrite has 4 posterior surface setae, unlike any other species of Bathycalanus ; the coxal endite has one relatively well-developed seta unlike most other known Bathycalanus except Ba. pustulosus n. sp.; and basal endite 2 has 4 setae whereas in Ba. pustulosus it has only 2 setae ( Table 10 View TABLE 10 ). The genetic distance data suggest that this species may represent an as yet unrecognised genus (see Tables 14–17).
Etymology. The species name is derived from the Latin adjective “ tumidus ” meaning swollen, referring to the shaped of the genital double-somite.
| NIWA |
National Institute of Water and Atmospheric Research |
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.