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Phormospyris stabilis stabilis Goll, 1976

Description - Add description

Benson, 1966, p. 332-334; pl. 23, figs. 6-8:

Desmospyris anthocyrtoides (Bütschli) Haeckel

Petalospyris anthocyrtoides Bütschli, 1882a, Zeitschr. f. wiss. Zool., vol. 36, pp. 533, 539, Pl. 32, fig. 19; 1882b, Pl. 29, fig. 7.
?[sic.] Dictyocephalus obtusus E., Bütschli, 1882a, Zeitschr. f. wiss. Zool., vol. 36, pp. 535, 539, Pl. 33, fig. 20.
Dictyocephalus? obtusus Ehrbg., Bütschli, 1882b, Klassen und Ordnungen des Thier-Reichs, vol. 1, pt. 3, Pl. 31, fig. 10.
Desmospyris anthocyrtoides Haeckel, 1887, Challenger Rept ., Zool., vol. 18, p. 1090.

Test consisting of a smooth bilocular cephalis separated by a constriction from a smooth, straight-sided thorax whose mouth in fully developed specimens is completely closed by a rounded lattice. Pores of lateral portions of cephalis circular, small, about one- half to two times the width of the intervening bars; pores on either side of the sagittal ring, paired, slightly larger. Pores of the thorax unequal, with circular or subcircular to irregular shapes, about the same size as or larger than the sagittal pores of the cephalis. Sagittal ring asymmetrical, three-bladed with one blade projecting inward in the sagittal plane and two blades projecting laterally outward. Generally six collar pores present, the cardinal, cervical, and jugular pores, the last covered by an indistinct dorsal sagittal cephalic lobe. Apical and vertical spines present but indistinct, represented by short, thin, conical spines or thorns. In several specimens the primary and secondary lateral bars extend as and are collinear with short, thin, conical spines that arise from the collar stricture; the dorsal bar extends for a distance of one to two pores as a rib in the thoracic wall; it does not terminate in a free spine.

Measurements; based on 30 specimens from stations 92 and 93: sagittal height of cephalis 36-50 µm, maximum breadth 62-111 µm; length of thorax (includes incompletely developed thorax) 27-62 µm, maximum breadth 57-95 µm; length of apical spine 0-6 µm.

Remarks. There is no doubt that this species is identical with a species tentatively identified as Dictyocephalus obtusus Ehrenberg by Bütschli (1882a, p. 539, Pl. 33, fig. 20; 1882b, Pl. 31, fig. 10) from the Eocene or Oligocene of Barbados. The writer interprets Petaloapyris anthocyrtoides Bütschi (1882a, p. 539, Pl. 32, fig. 19; 1882b, Pl. 29, fig. 7) as an incompletely developed form of D. obtusus. The former has page priority over the latter; therefore, it becomes the nominal species, although the latter was first described by Ehrenberg (1844, p. 877; 1856, Pl. 22, fig. 40) but conforms to the Gulf species only in the sense of Bütschli.

Distribution. This species is rare but cosmopolitan in the Gulf, occurring as far north as station 192. It is absent at stations 64, 90, 99, 130, 184, 191, 194, and all those to the north. Its distribution is similar to that of Patagospyris? sp. and Rhodospyris sp., i.e., an offshore species.
Benson 1966











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