Conus comatosaeformis    (Yokoyama, 1928)

 

 

 

 

 

 

Conus comatosaeformis Yokoyama (2)

Plate 10, figures 7-8

 

Conus comatosaeformis Yokoyama, 1928, Imp. Geol. Survey Japan Kept. 101, p. 29. pl. 1, fig. 10.

Yokoyama, 1929, Imp. Geol. Survey Japan Kept. 104, p. 12, pl. 7, fig. 7.

Nomura, 1935, Tohoku Imp. Univ. Sci. Repts., 2d ser., v. 18, no. 2, p. 110.

Conus (Asprella) comatosaeformis. Hatai and Nisiyama, 1952, Tohoku Imp. Univ. Sci. Repts., 2d ser., spec. v. 3, p. 192.

 

Nomura suggested that this species might prove to be a synonym of C. aculeiformis but this is doutbful.

The shell of this species is very thin, which alone would distinguish them, and moreover the shell is not as slender anteriorly as C. aculeiformis. Unfortunately the spiral sculpture on the only specimen found is nearly obliterated.

 

Conus smirna Bartsch and Rehder (1943, p. 87), a living Hawaiian species, compares favorably with this species in shape and in the almost paper thinness of the shell. Bartsch and Rehder stated that no similar species was known to them. It was obtained from 257-312 fathoms.

 

Distribution: Miocene or Pliocene, (Shinzato tuff member) Okinawa; Pliocene, (Byoritzu beds) Formosa, (Konomine formation) Japan.

 

Localities: Shinzato tuff member, 17633 (figured).

 

Comparative bathymetric data: The type of C. smirma, presumably a close relative of this species, was obtained off Hawaii from between 257 and 312 fathoms.

 

Conus comatosaeformis YOKOYAMA, 1928 (XXXII. 29, n. sp.). (1)

Lower Byoritz; South of Kwan in San, Taikei Gai, Shinchik.

Plate 87 fig. 10

 

Asprella australis comatosaeformis (YOKOYAMA),

an ancestor of Asprella australis , the HOLTEN's species (1803), fide KURODA verbally

 

 

 

 

 

Bibliografia

 

·         (1) - PALAEONTOLOGICAL SOCIETY OF JAPAN SPECIAL PAPERS NUMBER 6 Matajiro YOKOYAMA'S “TERTIARY · FOSSILS FROM VARIOUS LOCALITIES IN JAPAN” Part IV.

·         (2) - Tertiary and Quaternary Gastropoda of Okinawa By F. STEARNS Mac NEIL - GEOLOGICAL SURVEY PROFESSIONAL PAPER 339 “A comparison of the late Miocene, Pliocene, and Pleistocene Gastropoda of Okinawa with  related faunas of East Asia together with a resume of the geologic setting of the fossiliferous deposits

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