N27

Carpocanarium papillosum (Ehrenberg) group

Eucyrtidium papillosum Ehrenberg, 1972a, p. 310; 1872b, pl. 7, fig. 10

Dictyocephalus papillosus (Ehrenberg), Haeckel, 1887, p. 1307; Riedel, 1958, p. 236, pl. 3, fig. 10, text-fig. 8

Dictyocryphalus papillosus (Ehrenberg), Nigrini, 1967, p. 63, pl. 6, fig. 6.

Carpocanium calycothes Stohr, 1880, p. 96, pl. 3, fig. 8.

Dictyocephalus bergontianus Carnevale, 1908, p. 32, pl. 4, fig. 20.

DESCRIPTION

"The designation 'Carpocanarium spp.' is used for forms with hemispherical cephalis, distinct collar stricture, ovate thorax with rather few, rather large pores and occasionally three short spine-like wings in its proximal half, and a poreless subcylindrical peristome which in some specimens is irregularly terminated to give the impression of a corona of teeth. These forms include the type species of Carpocanarium Haeckel (Carpocanium calycothes Stohr), and are not closely related to the type species of Dictyocryphalus (Cornutella obtusa Ehrenberg, 1844a, p. 77; 1854b, pl. 22, fig. 40), to which genus the best-known member of this group of species (Eucyrtidium papillosum Ehrenberg) has recently been assigned." (from Riedel and Sanfilippo, 1971).

Description of D. papillosus from Riedel, 1958:

"Cephalis approximately hemispherical, with small subcircular pores in a hyaline shell-wall, set off from thorax by a pronounced change in contour. Many specimens have a small, inconspicuous lateral tubule projecting slightly from the cephalis near its junction with the thorax, and a short, acute apical horn. Thorax ovate, usually with a rough surface, and with a conspicuous subcylindrical or flared peristome surrounding the mouth which is approximately one-half to two-thirds as broad as the thorax. Thoracic pores subcircular to circular, usually of different sizes and without regular arrangement, separated by rather wide and often thick intervening bars. In the upper part of the thoracic wall are three, usually conspicuous longitudinal ribs, which in many specimens terminate in three short, solid, triangular lateral wings at or about the level at which the thorax reaches its maximum breadth."

DIMENSIONS "Length of cephalis 18-25 microns, of thorax (including peristome) 60-90 microns. maximum breadth of thorax 58-70 microns." (from Riedel, 1958).

Plate 21, figure 3

N28

REMARKS

1. For further synonymy see Nigrini (1967); for further taxonomic discussion see Riedel and Sanfilippo (1971); for further morphology see Riedel (1958).

RECENT DISTRIBUTION

1. Nigrini, 1967, fig. 33; "Indian Ocean occurrences - D. papillosus is very sparsely distributed in both low and middle latitudes, never forming more than 1 percent of the described population."

2. Molina-Cruz, 1975, Code N8 [Dictyocryphallus papillosus (Ehrenberg)]; used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent N8 at each station.