Scottoecia, Angel, 2012

Angel, Martin V., 2012, Scottoecia-a new genus of halocyprid ostracod, with the description of Scottoecia arabica nov. sp. and the redescription of Bathyconchoecia darcythompsoni (Scott, 1909), Zootaxa 3254 (1), pp. 32-54 : 33-34

Genus Scottoecia gen. nov.

Classification

Class Ostracoda Latreille, 1802

Subclass Myodocopa Sars, 1866

Order Halocyprida Dana, 1853

Suborder Halocypridina Dana, 1853

Family Halocyprididae Dana, 1853

Subfamily Euconchoecinae

Genera Euconchoecia , Bathyconchoecia , Scottoecia

Synonymy. 1909 Euconchoecia d’arcy-thompsoni Scott: 128–129, pl. IV, figs 1–12.

part 1968 Bathyconchoecia ─ Deevey: 539–570.

part 1969a Bathyconchoecia ─ Poulsen:135–143. part 1969b Bathyconchoecia ─ Poulsen: 26–36.

part 1970 Bathyconchoecia ─ Angel: 181–199.

1973 Bathyconchoecia lacunosa ─ James : 436–440, figs 1,2.

part 1972 Bathyconchoecia ─ Poulsen: 450–452.

Etymology. The name is derived from “Scott” in honour of Thomas Scott who described the first species, and “- oecia” from the Greek word “Ɩκοσ ” meaning house, from which the terms ecology and economy have been derived; this ending has become standard for many halocyprid genera.

Type species. Scottoecia arabica nov. sp.

Composition. The new genus includes five species, all previously classified as Bathyconchoecia species :

Bathyconchoecia darcythompsoni ( Scott, 1909) .

Bathyconchoecia foveolata Deevey, 1968 .

Bathyconchoecia crosnieri Poulsen, 1969b .

Bathyconchoecia subrufa Angel, 1970 .

Bathyconchoecia lacunosa sensu James, 1973 .

Differential diagnosis. Large Euconchoeciinae species (♀ 2.9–6.6 mm, ♂ 2.6–6.25 mm) with carapaces often ornamented with overall sculpturing of a faint scaly pattern, sometimes with pits, and beneath the incisure on the anterior margin the scalar pattern may become aligned to form striae that initially run parallel to the carapace margin but then curve ventrally to intercept the ventral margin obliquely. The carapace glands on each valve are quite large and open symmetrically just below the posterior dorsal corner within a sinus that in some species is located on the tip of a small tubercle. The rostra are long and the incisure is broad and open. The posterior margin of the carapace is either smooth or lined with blunt denticles. In common with Bathyconchoecia species , there is no frontal organ. The structures of the mandibular basale and coxale are characteristic, as illustrated in figures 3F and 6B (see also Deevey 1975, fig. 7f for B. foveolata ) and are quite distinct from those of all other halocyprids. In males the dorsal seta on the terminal segment of the sixth limb is exceptionally long and is much longer than the other two terminal setae ( Figs 2B and 5I ), (see also Deevey 1968 fig. 12C for B. foveolata ; Angel 1970 fig. 1G for B. subrufa ; Poulsen 1969a, fig. 4q for B. crosnieri , contrast with Deevey 1968, fig. 2e for B. paulula ). The copulatory appendage is banana-shaped with oblique muscles only at the base.

Figures

FIGURE 2. Scottoecia arabica n. sp. Male (Holotype Charles Darwin Station 54002#1 200–250 m). A. Fifth limb; B. Sixth limb; C. Sixth limb dorsal terminal seta enlarged; D. Detail of armature on sixth limb dorsal terminal seta; E. Copulatory appendage; F. Detail of end of copulatory appendage; G. Caudal furca. Scales in mm.

FIGURE 5. Scottoecia darcythompsoni Male (Discovery Station 10109#8 1120–1130 m) A. Carapace lateral view; B. Carapace lateral view; C. Posterior dorsal corner of right carapace showing the opening of the carapace gland; D First antenna; E. Right second antenna; F. Detail of hook appendage on the endopodite of the right second antenna; G. Detail of the left hook appendage; H. Fifth limb; I. Sixth limb; J. Copulatory appendage. Scales in mm.