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Kinoshita K.,Kobe University | Kiwata M.,Kobe University | Kuwano R.,Oita Marine Palace Aquarium Umitamago | Sato N.,Oita Marine Palace Aquarium Umitamago | And 4 more authors.
Theriogenology | Year: 2012

Concentrations of serum estradiol-17β and progesterone were monitored in six female walruses using an enzyme immunoassay. Progesterone concentrations increased from March to May in females aged 6 y or older, and subsequently declined (October). No significant elevation of estradiol-17β concentration was detected before an elevation of progesterone concentration. Vaginal smears from four females were examined with Papanicolaou staining. In all females, most epithelial cells were basophilic intermediate-superficial cells; no color change from basophilic to eosinophilic of the cells was detected. Meanwhile, the percentage of anucleate cells in vaginal smears reached its highest value before the elevation of progesterone concentration, followed by an increase in the percentage of leukocytes. We inferred that the change in populations of anucleate cells and leukocytes in vaginal smears reflected ovarian status and CL formation in female walruses. © 2012 Elsevier Inc..

Hoshino K.,Oita Marine Palace Aquarium UMITAMAGO | Hibino Y.,Mie University | Kimura S.,Mie University | Machida Y.,Kochi University | Machida Y.,Shikoku Institute of Natural History
Ichthyological Research | Year: 2011

The worm eels, Muraenichthys okamurai Machida and Ohta 1996 and M. borealis Machida and Shiogaki 1990, both from Japanese waters, have been distinguished by the difference in dentition on the upper jaw and palatal area, and regarded as valid species of Scolecenchelys. A detailed examination of the dentition of the type specimens and recently caught specimens revealed that the difference in the dentition described in the original descriptions is actually intraspecific variation. Apparently M. okamurai represents the juvenile of M. borealis, and the former is its junior subjective synonym. © 2011 The Ichthyological Society of Japan.

Hibino Y.,Mie University | Kimura S.,Mie University | Hoshino K.,Oita Marine Palace Aquarium UMITAMAGO | Hatooka K.,Osaka Museum of Natural History | Mccosker J.E.,California Academy of Sciences
Ichthyological Research | Year: 2012

The myrophine ophichthid fishes (worm eels) Muraenichthys aoki Jordan and Snyder 1901 and Murae-nichthys gymnotus Bleeker 1857 are redescribed as valid species of Scolecenchelys based on the types and non-type specimens collected from the Indo-Pacific. Because both species are similar to each other in having acute snouts, the posterior margin of the eye before the rictus, and their dorsal-fin origins located slightly posterior to a vertical line through the anus, Scolecenchelys aoki has usually been regarded as a junior synonym of Scolecenchelys gymnota. However, S. aoki is clearly distinguishable from S. gymnota by having a median groove on the ventral side of snout (absent in S. gymnota), uniserial maxillary teeth in smaller specimens (\200 mm TL; vs. biserial), three infraorbital sensory pores at postorbital area (vs. two), and more numerous vertebrae (56-65 in predorsal vs. 51-57; 53-58 in preanal vs. 47-52). Scolecenchelys aoki is restricted to Japanese waters and regarded as a senior synonym of Muraenichthys borealis Machida and Shiogaki 1990. Scolecenchelys gymnota is widely distributed in the Indo-Pacific, from South Africa and the Red Sea to Samoa, north to Okinawa, Japan. Sphagebranchus huysmani Weber 1913 and Muraenichthys fowleri Schultz 1943 are synonymized under S. gymnota. © The Ichthyological Society of Japan 2012.

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