Bairdoppilata hirsuta ( Brady, 1880 )

Maddocks, Rosalie F., 2022, Taxonomic applications of the esophageal flapper valve in Bairdoppilata and Glyptobairdia (Bairdiidae, Ostracoda), with comments on anatomy, ontogeny, and geography, Zootaxa 5175 (3), pp. 301-342 : 321-322

Bairdoppilata hirsuta ( Brady, 1880)

( Figure 11 )

1880 Bairdia hirsuta Brady , n. sp.: 51, pl. 4, figs. 4, 5.

1976 Bairdia hirsuta Brady. —Puri & Hulings, p. 265, pl. 4, figs. 4, 5.

Not 1969 Bairdoppilata ( Bairdoppilata ?) hirsuta (Brady) .—Maddocks, p. 79, fig. 43A–I, pl. 2, figs. 1, 2.

Not 1973 Bairdoppilata hirsuta (Brady) .—Maddocks, p. 42, figs. 5B–G, 6A–E [= B. hirsutella , n. sp., see below].

Not 2009 Bairdoppilata ? hirsuta (Brady) .—Maddocks et al., Checklist, p. 888.

Material Examined: None.

Taxonomic Remarks: The species is firmly identified only from the type locality. The lectotype selected by Puri & Hulings (1976) is a somewhat nondescript RV from Challenger Station 300, near Juan Fernandez Island in the Southeast Pacific (33 o 44’0”S, 78 o 10’0” W, depth 1375 fathoms). They reported the dimensions as: RVL 1.46 mm, RVH 0.90 mm (see Fig. 11 ). Supplemental bairdoppilatan dentition was not mentioned and is not visible in their illustration. The calcified inner lamella (infold) of the lectotype is somewhat narrow, and it may be an instar. The soft parts are unknown. Redescription of a larger, preferably living population from this locality will be needed to recognize this species, and all records of B. hirsuta at other localities require re-examination .

Specimens from Eltanin station 25, in the East Pacific were identified as B. hirsuta by Maddocks (1973), but that identification is dubious. For clarity of communication, a new name, B. hirsutella Maddocks , n. sp., is proposed below for that Eltanin population.

Maddocks (1969) described and illustrated two adult females as B. (B.?) hirsuta (specimen 468F, USNM 121353 ; specimen 469F, USNM 121355 ; both from the Gulf of Mexico, 28 o 15’N, 87 o 02’W, depth 1000 m). Their dimensions agree well with the population described from Eltanin station 25 ( Fig. 12 ), but without males a firm identification is difficult .

Maddocks (1969) also reported subfossil valves from numerous Albatross and Anton Bruun stations, but those identifications are even less plausible. Brandão (2008) demonstrated that the diversity of bairdioids has been severely underestimated in the Southern Ocean and in deeper water.

Figures

FIGURE 11. Bairdoppilata hirsutella Maddocks, n. sp. H:L scatter plot for 4 specimens from Eltanin station 25: Holotype specimen 634M (USNM 139891), and paratype specimens 635F (USNM 139892), 636W, and 689J (USNM 139894).Also plotted here are specimen 468F (SUM 121353), which was collected in the Gulf of Mexico and is of uncertain species identity, and the Lectotype RV of Bairdia hirsuta Brady.

FIGURE 12. Bairdoppilata hirsutella Maddocks, n. sp. A–C, molting juvenile specimen 689J, USNM 139894, instar A–1: A, LV interior in reflected light, with narrow infold, broad but weakly calcified inner lamella, and vestibules partly filled with fluid; B, LV interior in reflected light, with AMS, showing striated, hummocky texture of inner chitinous lining, as sensilla and cuticle are being withdrawn from older valve; C, anterior margin of RV interior in reflected light, showing narrow (normal) infold. D–K, holotype adult male specimen 634M, USNM 139891: D–E, LV and RV interiors in reflected light, with broad calcified inner lamella, shallow vestibules separated ventrally, prominent selvage and fringes; F, RV interior, posterodorsal edge with denticles of supplemental dentition; G, LV interior, posterodorsal edge with locules of supplemental dentition beneath dorsal overhang; H–I, RV and LV exteriors in transmitted light, with broad (normal) inner lamellae, fairly deep vestibules, NPC, sensilla, and AMS; J–K, RV and LV exteriors in reflected light, showing smooth surface and sensilla; RV caudal process is damaged. L–M, adult female specimen 635F, USNM 139892: RV and LV exteriors in transmitted light, with AMS and sensilla. Scale bar = 50 µm.