Bairdia crosskeiana Brady, 1866

Maddocks, Rosalie F., 2013, New and poorly known species of Neonesidea (Bairdiidae, Ostracoda, Crustacea) from French Frigate Shoals, the Hawaiian Islands, Zootaxa 3608 (6), pp. 457-510 : 464

Bairdia crosskeiana Brady, 1866

History: B. crosskeiana was originally described by Brady (1866) from the eastern Mediterranean. Brady (1880, 1890) later reported it from several Pacific islands, but the provenance of the illustrated specimens was not documented ( Fig. 4 ). Chapman (1910) listed it at Funafuti but did not illustrate it.

Holden (1967) considered Brady's (1880) report from Hawaii to be a misidentification. He illustrated Hawaiian specimens for comparative purposes and mentioned some distinctive details but did not propose a new name for them. Holden (1976) included B. crosskeiana of Brady (1880, not 1866) and of Holden (1967) in the synonymy for his identification of Neonesidea gierloffi at Midway and the Hawaiian Islands. This identification was probably erroneous ( Fig. 4 ).

Titterton et al. (2001) selected and illustrated a lectotype for B. crosskeiana . Their synonymy excluded the subsequent reports by Brady (1880, 1890), and they commented (p. 33) that, "For the moment, it is considered doubtful whether this species occurs in the Pacific Ocean." They mentioned that slides bearing this name in the Brady Collection from Pacific locations include specimens identifiable as Neonesidea woodwardiana (Brady, 1880) , N. schulzi sensu lato (Hartmann, 1974), and perhaps N. schulzi ifalikensis Maddocks, 1969 . Unfortunately, their synonymy also included Bairdia crosskeiana Brady of Holden (1967)—which contradicts Holden's evaluation, their exclusion of Brady (1880), and their stated doubt concerning the validity of Pacific records! Their remarks (p. 33) added to the muddle by stating that the Hawaiian material of B. crosskeiana is similar to N. ritugerda except "higher and more elongate," although Holden's statements and drawings clearly show the opposite. They did not mention Holden (1976).

Conclusions: The true Neonesidea crosskeiana (Brady, 1866) lives in the eastern Mediterranean, and reports from the Pacific Ocean are considered dubious. Its soft parts are unknown.

The records from Hawaii (Brady 1880, Holden 1967) and Midway (Holden 1976) belong to three different, unidentified species. Figure 4 shows their size relationships. Other records from the Pacific require re-evaluation.

Figures

FIGURE 4. L – H scatter plot for Pacific records of Bairdia crosskeiana of Brady (1880) and similar species.