Boroecia maxima ( Brady & Norman, 1896 )

Stępień, A., Błachowiak-Samołyk, K., Krawczuk, M. & Angel, M. V., 2018, A revision of the genus Boroecia Poulsen 1973 (Ostracoda, Halocypridae) with the descriptions of three new species, Zootaxa 4394 (3), pp. 301-346 : 321

2.3. Boroecia maxima ( Brady & Norman, 1896)

( Figures 7–9 )

Since Chavtur et al. (2015) have recently published a full and detailed description of this species, we are only providing a set of comparable drawings (of specimens collected in the Norwegian Sea at 65°N 20°W), and meristic data. Table 1 compiles length data for the juvenile instars from three localities, 65°N 20°W (sampled throughout a year), in the vicinity of Svalbard at 77° to 82.5°N, and over the Canadian Deep in the vicinity of 75°N 161°W. It was the dominant halocyprid species at all three localities; these length data are remarkably consistent. However, Chavtur et al. (2015) reported finding a few smaller specimens, which had lengths that are consistent with the sizes we provide for B. hopcrofti below. These length data show there are no significant size differences across quite a broad latitudinal range, nor were any suggestions of there being seasonal variations evident in the data from 65°N 20°W, although the data are insufficient for rigorous statistical evaluation.

Figures

FIGURE 7. Boroecia maxima male 3.20 mm (Exemplar specimen from the Norwegian Sea at 65°W 20°E): A. Carapace, lateral view; B. Carapace, ventral view; C. First antenna and frontal organ; D. Right second antenna; E. Second antenna, right hook appendage; F.Mandible; G.Mandible, toothed edge of basale; H. Mandible tooth-lists on caxale.Scales in mm.

FIGURE 8. Boroecia maxima male 3.20 mm (Exemplar specimen from the Norwegian Sea at 65°W 20°E): A. Maxilla; B. Fifth limb; C. Sixth limb; D. Caudal furca;E.Copulatory appendage. Scales in mm.

FIGURE 9. Boroecia maxima female 3.20 mm (Exemplar specimen from the Norwegian Sea at 65°W 20°E): A. Carapace, lateral view; B. Carapace, ventral view; C. First antenna and frontal organ; D. Right second antenna, E. End of first segment of the exopodite of the second antenna; F.Second antenna, right hook appendage; G. Fifth limb; H.Sixth limb.Scales in mm.