N75

Lamprocyclas maritalis maritalis Haeckel

Lamprocyclas maritalis Haeckel, 1887, p. 1390, pl. 74, figs. 13, 14

Lamprocyclas maritalis maritalis Haeckel, Nigrini, 1967, p. 74, pl. 7, fig. 5

DESCRIPTION

"Shell campanulate, usually thick-walled, and generally with a rather rough surface. Cephalis elongate, trilocular, the 2 secondary lobes beneath and somewhat lateral to the larger primary lobe. Pores numerous, subcircular; apical horn stout, 3-bladed, 2 or 3 times cephalic length. Primary lateral and dorsal spines continue as ribs in the thoracic wall for about half its length; rarely, these project from the thorax, forming small wings. Collar stricture not pronounced.

"Thorax cupola-shaped (conical above, inflated below) with hexagonally framed circular to subcircular pores, arranged in longitudinal rows and increasing slightly in size distally; 9-11 across the widest part of the segment.

"Lumbar stricture distinct and marked internally by a septal ring. Abdomen cylindrical, inflated. Pores hexagonally framed, circular to subcircular, arranged in longitudinal rows; larger than thoracic pores, 9-10 on a half-equator, 3-5 in a vertical series.

"Peristome well differentiated, poresless, sometimes with up to 12 triangular lamellar teeth arising from its lower edge, but often teeth are rudimentary or absent. Subterminal teeth, on the abdomen just above the peristome, are conical or thorn-like, divergent, and usually better developed than terminal teeth." (from Nigrini, 1967).

DIMENSIONS

"Total length (excluding apical horn) 119-173 microns. Length of cephalis 27-36 microns; of thorax 45-63 microns; of abdomen (excluding peristome) 45-72 microns. Maximum breadth of thorax 81-90 microns; of abdomen 100-128 microns." (from Nigrini, 1967).

"Total length, excluding apical horn: 136 +/- 21 microns; maximum width 87 +/- 10 microns; thorax length 43 +/- 9 microns; abdomen length 63 +/- 19 microns; based on measurements of 10 specimens." (from Sachs, 1973).

REMARKS

1. For a more complete synonymy see Nigrini, 1967.

Plate 25, figure 4

N76

2. "Distinctions between L. maritalis maritalis and L. maritalis polypora might seem rather artificial, but they form a useful division insofar as there seems to be a correlation of the two forms with latitude. Both subspecies are found in low and middle latitudes, but in middle latitudes L. maritalis maritalis is fairly abundant and L. maritalis polypora is rare, and in low latitudes both subspecies are rather rare but L. maritalis polypora is relatively more abundant." (from Nigrini, 1967).

3. The specimens illustrated by Sachs (1973, pl. 2.6, fig. d, e) as L. maritalis maritalis are really Lamprocyrtis (?) hannai. His counts may have included both species.

RECENT DISTRIBUTION

1. Nigrini, 1967, fig. 39; "Indian Ocean occurences - L. maritalis maritalis is very sparsely distributed in low latitudes, but is fairly abundant (3% to 9% of the described populations) south of 35 degrees S."

2. Nigrini, 1970, fig. 33; belongs to a tropical assemblage derived by recurrent group analysis of North Pacific sediments, but the species does range as far north as 40-45 degrees N right across the Pacific.

3. Lozano, 1974, Fig. IV-2; "Maximum abundance of 3 percent of the total radiolarian fauna in core RC12-292. Never found under surface waters colder than 10 degrees C and present in percentages greater than 1.0 only under waters with February temperatures greater than 16 degrees C."

4. Molina-Cruz, 1975, Code N17; not used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent N17 at each station.