Comprehensive Description

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Description

Benson, 1966, p. 390-391; pl. 25, fig. 12:  Callimitra emmae Haeckel  Callimitra emmae Haeckel, 1887, Challenger Rept., Zool., vol. 18, p. 1218, Pl. 63, figs. 3, 4.   Cephalis helmet-shaped with a pointed apex, smooth, with unequal, subpolygonal to subrectangular pores; separated from the pyramidal thorax by a distinct contour change and indistinct collar stricture. Thorax developed between the three, straight, divergent, three-bladed dorsal and primary lateral feet and constructed of a delicate network of thin, secondary bars that originate from the feet and from two to three or more heavier but thin, primary bars that extend at approximate right angles to each foot from each of the two lower blades of the feet; the primary bars between adjacent feet intersect distally; the secondary bars are oriented predominantly in two directions--parallel to the primary bars and transversely; therefore, they separate small, unequal, predominantly triangular to trapezoidal pores. The basal margin of the thorax is convex downward between adjacent feet. A similar lattice consisting of primary and secondary bars, comprises three, large, planar keels, each of which is developed between one of the blades of the three-bladed apical horn and the upper blade of the basal feet. The keels are separated by equal angles; their lateral margins are convex outward with a curve similar to one side of a spherical triangle. The primary bars of their lattice originate from the blades of the apical horn and the outer blade of each foot as well as from thin ribs in the wall of the cephalis, two of which correspond to the apical-lateral arches, and one of which lies in the sagittal plane; the primary bars intersect distally. The secondary bars are approximately parallel to the primary bars and to the outer curved margin of each keel; therefore, they separate unequal, triangular, trapezoidal, and rhombic pores. Four large collar pores present; cardinal pores are of type A; a distinct collar ring occupies the base of the latticed cephalis. The apical bar is an internal, nearly centrally located columella. The vertical spine is a short thorn.   Measurements; based on two specimens from stations 81 and 115: height of cephalis 42-47 µm; length of thorax 86-87 µm; breadth of cephalis 52-58 µm, of thorax 181-221 µm; length of apical horn 75-76 µm, of basal feet 89-105 µm.   Distribution. This species is very rare in the Gulf. It is present at stations 34, 81, 93, 106, and 115. It is, therefore, an oceanic species with little affinity for Gulf waters.  Haeckel (1887, p. 1218) reported this species from the central Pacific at "Challenger" station 272. It is apparently a tropical species because it has not been reported from high latitudes.

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