Antonietto et al.—Ostracoda from the Lower Jurassic Moenave Formation
carapace size ratios in comparison to S. globosa. Other than that, some morphological characters attributed to Suchonellina by Molostovskaya (1990) seem to be observable in specimens of the present work: (1) in dorsal view, it is hinted that their hinge displays an arrangement of two marginal, enlarged protuber- ances separated by a sulcus in the right valve, and (2) the frontal view indicates a shifting upward of the right valve along the overlapping in the ventral margin. Darwinula maanshanensis Hou in Hou et al. (2002) (nom. nov. for the homonym D. longovata Wei in Wei, Li, and Jiang, 1983) also displays the aforementioned morphological characters and is herein syno-
nymized with S. globosa. Specimens of ‘S. globosa’ were mis- figured by Dadlez and Kopik (1963) as Notocythere media excelsa Will, 1953, and vice versa. Specimens identified as A-2 juveniles of D. sarytirmenensis Sharapova in Mandelstam, 1947 (misspelled as ‘Darwinula sarytirmensis’) by Kieztke and Lucas (1995) are actually adult individuals of S. globosa, based on the presence of a posterior brood pouch, clearly apparent in dorsal view. Synonymy with the present species is tentative for: (1) Darwinula (102) of Christensen (1962), because it is a similar, but slightly smaller, species; and (2) Darwinula spp. of Sohn and Chatterjee (1979) and (3) D. liulingchuanensis Zhong, 1964 of Wei et al. (1983), due to poor preservation of specimens affecting general layout observations. The size ratios between instars of S. globosa is like that found between ontogenetic stages of D. stevensoni and Vestalenula sp. by Smith and Kamiya (2008). However, Smith et al. (2006) noted that adult males of V. cornelia Smith, Kamiya, and Horne, 2006 are also similar in size ratios to A-1 juveniles. Therefore the present authors, while figuring some of the instars of S. globosa, attributed a doubtful identification to specimens identified as A-1 juveniles.
Suchonellina stricta (Jones, 1894) Figure 5.14–5.19
1894
1964 1977 1983
Darwinula globosa (Duff, 1842) var. stricta Jones, p. 164, pl. 9, fig. 5.
?1963 Darwinula liassica; Dadlez and Kopik, p. 138, pl. 1, fig. 8.
Darwinula stricta Jones, 1894; Anderson, p. 136, pl. 15, figs. 129–132.
Darwinula cf. liassica (Brodie, 1843); Ye et al., p. 263, pl. 21, fig. 3a, b.
?1989a Gerdalia sp.; Kietzke, p. 186, fig. 4F. 1991 1999 2002
Darwinula xinpingensis Jiang; Wei et al., p. 176, pl. 54, fig. 6D, R.
Gerdalia sp.; Kietzke and Lucas, p. 193, fig. 3A. Gerdalia sp.; Swain, p. 168, pl. 17, figs. 43, 44.
Darwinula xinpingensis; Hou et al., p. 773, pl. 310, figs. 7, 8.
655 Lectotype.—BMNH I 6089, designated by Anderson (1964).
Occurrence.—Rhaetian, Upper Triassic, Penarth Group, Pylle hill, Bristol, Bristol County, England, UK(type locality); also at Glamorgan, Gloucestershire, Shropshire, and Warwickshire counties (Jones, 1894; Anderson, 1964). Rhaetian, Upper Triassic, Inner Moray Firth Basin, Linksfield, Elgin, Moray- shire, Scotland, UK (Jones, 1894). Upper Triassic, Baijizu Formation, Yunnan, China (Ye et al., 1977). Uppermost Trias- sic, Shezi Formation, Yunnan, China (Wei et al., 1983). Carnian, Upper Triassic, Tecovas Formation, Texas, USA (Kieztke and Lucas, 1991). In the present work, extended to the Hettangian, Lower Jurassic, Whitmore Point Member, Moenave Formation, Arizona and Utah, USA.
Materials.—Carapaces: UMNH.IP 5299 (adult; 0.91mm L, 0.41mm H, 0.30mm W), UMNH.IP 5300 (adult; 0.84mm L, 0.38mm H, 0.31mm W). Valves: UMNH.IP 5298 (incomplete A-2 juvenile?, left; 0.34mm H, 0.13mm W).
Remarks.—For a discussion on the generic placement of this species in Suchonellina, see the Remarks section under S. glo- bosa (above). The diagnosis of S. stricta follows Jones (1894) and Anderson (1964). The original proposal of the species, however, is from Brodie (1843), although the species was not formally described or illustrated in that monograph. Due to major morphological similarity between the type specimens of S. stricta and Darwinula xinpingensis Jiang in Wei et al. (1983), these are herein synonymized, as also are specimens of D. cf. D. liassica of Ye et al. (1977). Synonymy with the present species is tentative for: (1) D. liassica of Dadlez and Kopik (1963), because no size measurements for the illustrated speci-
mens were given; and (2) Gerdalia sp. of Kietzke (1989a), also figured by Swain (1999), for having a very similar, but not equal, general layout.
Superfamily Darwinuloidoidea Molostovskaya, 1979 Family Darwinuloididae Molostovskaya, 1979
Genus Whipplella Holland, 1934 Type species.—Whipplella cuneiformis Holland, 1934.
Whipplella? sp. 1 Figure 5.20–5.22
?2006 Cypridoidea indet.; Schudack, p. 428, fig. 2H.
Occurrence.—Hettangian, Lower Jurassic, Whitmore Point Member, Moenave Formation, Arizona and Utah, USA.
Figure 5. Ostracodes of the Whitmore Point Member, Moenave Formation, Hettangian, Lower Jurassic, Utah and Arizona, USA: (1–13) Suchonellina globosa (Jones, 1862): (1, 3, 4, 5) adult carapace (UMNH.IP 5293): (1) right lateral view; (3) dorsal view; (4) ventral view; (5) frontal view; (2) adult carapace (UMNH. IP 5303), left lateral view; (6, 8, 9) adult left valve (UMNH.IP 5296): (6) dorsal view; (8) internal view; (9) detail of the anterior inner lamella; (7) adult right valve (UMNH.IP 5297), dorsal view; (10) A-1? juvenile carapace (UMNH.IP 5301), right lateral view; (11) A-2 juvenile carapace (UMNH.IP 5292), right lateral view; (12) A-3 juvenile carapace (UMNH.IP 5302), right lateral view; (13) A-4 juvenile carapace (UMNH.IP 5304), right lateral view; (14–18) Suchonellina stricta (Jones, 1894): (14, 16, 17) adult carapace (UMNH.IP 5299): (14) right lateral view; (16) dorsal view; (17) frontal view; (15) adult carapace (UMNH.IP 5300), left lateral view; (18) A-2? right valve (UMNH.IP 5298), internal view; (19–22) Whipplella? sp. 1 (UMNH.IP 5294), right valve: (19) lateral view; (20) internal view; (21) dorsal view; (22) detail of the anterior inner lamella; (23–25) Whipplella? sp. 2 (UMNH.IP 5295), right valve: (23) lateral view; (24) internal view; (25) dorsal view. Scale bar = 100 μm.
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