62


Journal of Paleontology 91(1):25–72


Remarks.—Because the paper by Grill and Kozur was published in January 1986 but the paper by Takemura in December 1986, the species name of P. wallacheri has priority. It is also considered the type species of this genus.


Genus Pseudodictyomitrella Grill and Kozur, 1986


Type species.—Pseudodictyomitrella spinosa Grill and Kozur, 1986.


Other species.—Parvicingula limana Cortese, 1993; Pseudo- dictyomitrella badouxi O’Dogherty, Goričan and Dumitrica in O’Dogherty et al., 2006; Pseudodictyomitrella escheri O’Dogherty, Goričan and Dumitrica in O’Dogherty et al., 2006; Pseudodictyomitrella renevieri O’Dogherty, Goričan and Dumitrica in O’Dogherty et al., 2006.


Remarks.—All species here included under Pseudodictyomi- trella have a conical shell with an acute cephalis tapering in an apical horn. For a detailed description of all these species the reader is referred to O’Dogherty et al., 2006.


Occurrence.—Lower Bajocian to upper Bathonian.


Pseudodictyomitrella limana (Cortese, 1993) Figure 6.45−6.48


1985 Parvicingula ? sp. Yamamoto et al., p. 36, pl. 6, fig. 5. 1993 Parvicingula limana Cortese; p. 177; pl. 4, figs. 5–7.


2003 Parvicingula cappa Cortese; Suzuki and Gawlick, p. 187, fig. 6.84 only.


2006 Pseudodictyomitrella limana;O’Dogherty et al., p. 440, pl. 5, fig. 18.


Pseudodictyomitrella renevieri O’Dogherty, Goričan, and Dumitrica in O’Dogherty et al., 2006 Figure 7.5−7.7


1998 Parvicingula ? sp. A1 Arakawa, pl. 10, fig. 454. 1998 Parvicingula ? sp. J0 Arakawa, pl. 10, fig. 462.


2006 Pseudodictyomitrella renevieri O’Dogherty, Goričan, and Dumitrica inO’Dogherty et al., p. 440, pl. 5, figs. 19−22.


Pseudodictyomitrella sp. cf. P. renevieri O’Dogherty, Goričan, and Dumitrica in O’Dogherty et al., 2006 Figure 7.8


Remarks.—The specimen has a pointed cephalis but supposedly due to preservation it lacks the apical horn.


Genus Xitomitra new genus Type species.—Stichomitra tairai Aita, 1987.


Other species.—Stichomitra annibill Kocher, 1981 (syn. Stichomitra? matsuokai Hull, 1997).


Diagnosis.—Shell conical with four or more segments and a large distal aperture. Very large cephalis, imperforate and usually bear- ing a small apical horn. Subsequent segments increasing gradually in height, with well-defined external strictures. All segments cov- ered by a regular pattern of polygonal (mostly hexagonal) pore frames. Distalmost segments may bear thick nodes.


Etymology.—Arbitrary combination of letters (ICZN, Art. 11.3) plus mitra (from Latin, meaning cap); feminine gender.


Remarks.—Xitomitra n. gen. differs from other genera included in this family by having a more lobate outline with well-marked strictures. It differs from Parvimitrella n. gen. by having a thick, wider and pointed cephalic region (see pl. 3, fig. 8a of Aita, 1987).


Occurrence.—Middle Bathonian to lower Callovian.


Xitomitra annibill (Kocher, 1981) Figure 6.51−6.54


1981 Stichomitra annibill Kocher, p. 96, pl. 16, figs. 24−26.


1989 Gen 2 sp. B Hattori and Sakamoto, ? pl. 14, fig. E.


1996 Stichomitra tairai Aita; Marcucci and Prela, pl. 2, fig. 14.


1997 Stichomitra (?) matsuokai Hull, p. 164, pl. 49, figs. 2−3, 13−14, 19−20.


2003 non Stichomitra annibill; Suzuki and Gawlick, figs. 6.35−6.36. [= X. tairai]


2005 Stichomitra annibill; Šmuc and Goričan, pl. 4, fig. 24.


2006 Stichomitra annibill;O’Dogherty et al., p. 442, pl. 5, figs. 1−3.


2006 non Stichomitra annibill; Auer et al., fig. 6.37. [= X. tairai]


2008 non Stichomitra annibill; Auer et al., fig. 9.66. [= X. tairai]


2009 non Stichomitra annibill; Suzuki and Gawlick, fig. 5.16. [= X. tairai]


Remarks.—Xitomitra annibill differs from Xitomitra tairai by having a smaller cephalis and a four-segmented shell. Further- more, the shell does not have the outer characteristic layer of ornametation as developed in the Japanese species.


Xitomitra tairai (Aita, 1987) Figure 6.35−6.38


1987 Stichomitra (?) tairai Aita, p. 72, pl. 3, figs. 7a−9; pl. 10, figs. 3−4.


1989 Stichomitra (?) sp. cf. S. tairai;Okada et al., pl. 32, fig. 12.


1996 non Stichomitra tairai; Marcucci and Prela, pl. 2, fig. 14. [= X. annibill]


2002 Stichomitra (?) tairai; Bragin et al., fig. 6.19.


2002 Stichomitra (?) sp. aff. S. (?) takanoensis Aita; Bragin et al., fig. 6.20.


2003 Stichomitra annibill Kocher; Suzuki and Gawlick, figs. 6.35−6.36.


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