Pseudopoulpus crassispinosus, Dumitrica & Zügel, 2003

Dumitrica, Paulian & Zügel, Peter, 2003, Lower Tithonian mono- and dicyrtid Nassellaria (Radiolaria) from the Solnhofen area (southern Germany), Geodiversitas 25 (1), pp. 5-72 : 32-33

Pseudopoulpus crassispinosus n. sp. ( Fig. 18 A-D, I)

HOLOTYPE. — Photo No. 33758, 33760; stub Mue 22/8; Musée de Géologie, Lausanne, No. 74392 ( Fig. 18A, B ). ETYMOLOGY. — From the Latin crassus: thick; and spinosus : spiny.

MATERIAL EXAMINED. — 10 specimens from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Total length 135-240 (av. 190), length of apical horn 35-90 (av. 60), of cephalis 75-120 (av. 95), of feet 55-90 (av. 75), of secondary horns 35-60 (av. 45); total width 120-200 (av. 155), width of cephalis 85-115 (av. 100).

DESCRIPTION

Cephalis globular with a distinctly visible dorsal lobe and with the ventral part inflate. Apical part of the cephalis with a stout apical horn and two or three stout secondary horns which are directed obliquely, shorter than the apical horn. Secondary horns generally aligned with primary lateral spines and, when three, also with the ventral spine. Feet short, straight or slightly curved outward, rapidly tapering. All feet and horns three-bladed, with additional long grooves on the blades. Ventral spine short, needle-shaped or pyramidal, well above the cephalic base. MB, D, V, and L with small spongy appendages, MB sometimes even completely wrapped up in a spongy tissue. Cephalic base slightly constricted, bordered by the collar ring formed of the arches Dl, Ll, and VL, exceptionally completely closed by a spongy tissue. Pores of cephalis pentagonally or hexagonally framed, with nodes at vertices giving the surface a knobby aspect.

REMARKS

The main differences between Pseudopoulpus crassispinosus n. sp. and the species described by Takemura (1986) are the same as for P. tenuihirsutus n. sp. P. crassispinosus n. sp. differs from P. tenuihirsutus n. sp. mainly by having three completely three-bladed horns on the apical part and robust feet with additional grooves developed on blades.

Figures

FIG. 18. — A-D, I, Pseudopoulpus crassispinosus n. sp.; A, B, holotype, left lateral and basal views showing a thick spongy tissue around median bar, ventral spine, and primary lateral spines; C, D, I, paratypes; C, right lateral view; I, same, basal view showing details of initial spicule and arches; D, basal view showing an exagerate overgrowth of spongy tissue covering completely the colar aperture; E, G, H, J, Pseudopoulpus tenuihirsutus n. sp.; E, J, paratype,partly broken specimen, ventro-apical view, and detail of the dorsal lobe with arches Al; G, holotype, dorsal view showing the slightly pronounced dorsal lobe; H, paratype with a large number of additional horns, left lateral view; F, Pseudopoulpus spinosus Kiessling, 1999, right lateral view showing a pronounced dorsal lobe. Abbreviations: A, apical spine; l, secondary lateral spine. Scale bars: 30 µm.