N81

Lamprocyrtis nigriniae (Caulet)

Conarachnium ? sp. Nigrini, 1968, p. 56, pl. 1, fig. 5a (partim.)

?Conarachnium? sp. Nigrini, 1968, p. 56, pl. 1, fig. 5b (partim.)

Conarachnium nigriniae Caulet, 1971, p. 3, pl. 3, figs. 1-4, pl. 4, figs. 1-4

Lamprocyrtis haysi Kling, 1973, p. 639, pl. 5, figs. 15-16, pl. 15, figs. 1-3

DESCRIPTION

"Two-segmented forms with hemispherical to cylindrical [three-lobed] cephalis, commonly open, with irregularly arranged circular to elliptical pores and a three-bladed apical spine and usually one or more accessory spines. Collar stricture indistinct. Thorax inflated conical, thin-walled, smooth, with subcircular (rarely elliptical to irregular) pores generally aligned in longitudinal and transverse rows (rarely irregularly arranged) and gradually increasing in size distally. Thorax terminates, sometimes slightly constricted, with an irregular row of small teeth; a weak peristome is seldom developed." (from Kling, 1973).

See also Nigrini (1968) and Caulet (1971).

DIMENSIONS

"maximum width 80-90 microns; length from top of cephalis 100-150 microns; thoracic pores 2-20 microns." (from Kling, 1973).

The thoracic breadth given by both Nigrini (1968) and Caulet (1971) is greater than that found by Kling for North Pacific specimens. For this reason Kling only tentatively included the specimen figured by Nigrini (1968) on pl. 1, fig. 5b.

REMARKS

1. For generic definition see Kling (1973).

Plate 25, figure 7

N82

RECENT DISTRIBUTION

1. Nigrini, 1968, text-fig. 6 (Conarachnium ? sp); "Few along the coast of Central and South America, and to the west in the region of the North Equatorial Current; most abundant in the northernmost sample in the study area; rare or absent in all other samples examined."

2. Caulet, 1971 (Conarachnium nigriniae); western Mediterranean (37 degrees 30.6 minutes N, 0 minutes 28.1minutes W).

3. Kling, 1973 (Lamprocyrtis haysi); DSDP Sites 173 (37 degrees 57.71 minutes N, 125minutes 27.12 minutes W), 174 (44 minutes 53.38 minutes N, 126 degrees 20.80 minutes W) and 175 (44 degrees 50.2 minutes N, 125 degrees 14.5 minutes W) in the Axoprunum angelinum and Artostrobium miralestense Zones of Kling.

4. Molina-Cruz, 1975, Code N5 (Lamprocyrtis haysi); used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent N5 at each station.