Cromyatractus elegans n. sp. Dogel, in Petrushevskaya, 1969b, p. 138
(Fig. 4, 2)
[In Russian. Translated by J.P.C.]
|Description and dimensions :Very elegant representative of the genus, with 4 lattice ellipsoidal shells. Longitudinal axis of the internal ellipsoid: 20µm, of the second shell: 55µm, of the third shell 140µm, of the cortical shell 160µm. Small axis of the cortical shell 150µm. The ellipsoid shell is, thus, slightly elongated. Polar spines round, smooth, without sides, of a length of 60µm, and with a basis as broad as 12µm. Third shell robust, with regularly distributed pores of 9-10µm diameter, shaped as 6-sided funnels. On the sides of the funnels there are small delicate spines that give at a distance of 15µm some tangential apophyses that are anastomosed in a fine superficial network shaped as a spider web.
Remarks: [[Described by Petrushevskaya after the papers left by Dogel.]
Repository: Holotype on slide n°1066. Marine Dept., Zoological Institute, Acad. of Sc., St Petersburg, Russia
Type locality: North Western Pacific Ocean, Expedition "Vityaz" 1961 [55°43'N-164°41'E, plankton]
Original stratigraphic range: Recent.
Etymology: From the Latin "elegans" = elegant.
Subsequent descriptions: YES
Cromyatractus elegans Dogel
Dumitrica, 1973a, p. 834
(Pl. 20, fig. 8)
|- ? Amphisphaera elegantula Lucchese, 1927, p.86, pl.1, fig.19
- Ellipsoxiphium palliatum Haecker, 1908b, pl.85, fig.587
- Cromyatractus elegans Dogel, in Petrushevskaya, 1969b, p.138, fig.4(2)
|Revised description and dimensions :The shell is ellipsoidal and consists of three or four lattice-shells, two spherical medullary, and one or two ellipsoidal cortical. The former and the latter lie rather closely together, but a larger space separates these two groups. The outer medullary shell has circular pores and is connected to the cortical shell by two strong polar spines and four or more thin bars located approximately in the equatorial plane. The former penetrate the cortical shell forming two unequal conical polar spines, whereas the latter do not. Slender by-spines arise here and there from the outer medullary shell without reaching the cortical shell with their distal ends. The latter is ellipsoidal, thick-walled, and has circular or subcircular pores hexagonally framed by high crests. Short spines arise from each corner of the hexagons, and between them a thin-walled additional shell may lie. In the studied material this shell is either absent, or quite incomplete.
Diameter of the inner medullary shell is 15µm; of the outer medullary shell, 40µm, and of the equatorial diameter of the cortical shell, 130µm. Polar diameter is 145µm.
Repository: Dumitrica's collection.
Type locality: Eastern Mediterranean Sea, Hellenic Trench, D.S.D.P. Lag 13-128-11, CC [35°42,58N-22°28,10E, 4640m]
Original stratigraphic range: Pleistocene.
Subsequent descriptions: ?
Literature cited: - Dumitrica, P. (1973a). Cretaceous and Quaternary Radiolaria in deep sea sediments from the [northeast] Atlantic Ocean and Mediterranean Sea. Initial Reports of the Deep Sea Drilling Project. W. B. F. Ryan, K. J. Hsu et al. Washington, D.C., U. S. Government Printing Office. 13: 829-901.
- Haecker, V. (1908b). Tiefsee-Radiolarien. Allgemeiner Teil. Form und Formbildung bei den Radiolarien. Wissenschaftliche Ergebnisse Deutschen Tiefsee Expedition auf dem Dampfer "Valdivia", 1898-1899. 14: 477-706.
- Lucchese, C. (1927). Radiolari miocenici di Salsomaggiore. Giornale di Geologia, Bologna 2, 2:80-116.
- Petrushevskaya, M. G. (1969b). Radiolyarii Spumellaria i Nassellaria v donnykh osadkakh kak indikatory gydrologycheskikh uslovii (Spumellarian and Nassellarian radiolarians in bottom sediments as indicators of hydrological conditions). Osnovnye Problemy micropaleontologii i organogennovo osadkonakopleniya v okeanakh i moryakh (Basic problems of micropaleontology and the accumulation of organogenic sediments in oceans and seas). A. P. Jouse. Moscow, USSR, Izdatelstvo Nauka, Akademiya Nauk SSSR, Okeanografitcheskaya Komissiya: 127-151.