TABLE 1. Measurements in mm of OMNH-QV4816 skull and periotic. For skull and mandible, distances are either horizontal or vertical.

Skull Measure
(mm)
Preserved length of skull 537
Bizygomatic width 1170
Bicondylar width 195
Preserved frontal length 352
Preserved frontal width 565
Posterior process of periotic maximum mediolateral length 226
Posterior process of periotic maximum anteroposterior length 26

 

TABLE 2. Records of Balaenoptera edeni and B. brydei with molecular data and/or morphological specimens around Japan, and in the Seto Inland Sea including the Osaka Bay. These data are taken from Marine Mammal Stranding Database of the National Museum of Nature and Science (www.kahaku.go.jp/research/db/zoology/marmam/drift/index.php) and IDs in this table are the ones in the database.

  Identification Age or date Locality Specimen Reference ID and specimen number
1 B. edeni 8000 to 4400 years before Osaka City Fossil skull This study OMNH-QV4816
2 B. edeni 11 Nov 1995 Shimotsu Port, Wakayama City, Wakayama Prefecture Skeleton Oishi et al 2009 1794, WMNH 1998-ver-3
3 B. edeni 22 Oct 2001 3.6 km southwest to Inge Island, Awaji City, Hyogo Prefecture DNA sample   3006
4 B. edeni 27 Aug 1978 8 km off Aki Town, Ooita Prefecture Skull at Kisuki City Museum   498
5 B. edeni 17 Jan 2007 Hitachinaka Port, Hitachinaka City, Ibaraki Prefecture DNA sample   5253
6 B. edeni 12 May 1994 Imouto Island OgasawaraVillage, Tokyo DNA sample   1678
7 B. edeni 21 Jun 2000 Off Daio Cape, Shima City, Mie Prefecture DNA sample   2638
8 B. edeni 27 Dec 2002 Fukumitsu, Ooda City, Shimane Prefecture DNA sample, Skeleton at Shimane AQUAS Aquarium   3455
9 B. edeni 20 Aug 1998 Tsunoshima, Shimonoseki City, Yamaguchi Prefecture DNA sample   2235
10 B. edeni 8 Nov 1994 Nase, Kitaura Town, Miyazaki Prefecture Skeleton at Kitaura Town   1707
11 B. edeni 31 Jan 2002 Fukue Island, Gotou City, Nagasaki Prefecture DNA sample   3107
12 B. edeni 7 Jun 2006 Takado Beach, Amakusa City, Kumamoto Prefecture Skull at Kumamoto City Museum   5068
13 B. edeni 24 May 2004 Marushima Port, Minamata City, Kumamoto Prefecture DNA, Skeleton   4128, NSMT-M 33622
1 B. brydei 5 Oct 2002 Natori City, Miyagi Prefecture DNA sample, Skeleton   3392, NSMT-M33072
2 B. brydei 15 May 2007 Nakasode, Sodegaura City, Chiba Prefecture DNA sample, Skeleton   5400
3 B. brydei 1953 No record Skeleton   NSMT-M03538

 

TABLE 3. Measurements in mm of Balaenoptera spp. skulls, distances are either horizontal or vertical. Having high alisphenoid is a diagnositic feature for B. edeni.

Scientific name Specimen
number
Bizygomatic width Zygomatic process maximum height Zygomatic process maximum length Alisphenoid maximum height Alisphenoid maximum length Occipital condyle width
B. edeni OMNH-QV4816 120.0 24.5 50.0 6.5 9.0 24.0
B. edeni NSMT-M33622 77.0 23.5 30.0 4.0 8.5 20.0
B. brydei NSMT-M33072 86.5 26.5 30.0 1.0 5.0 19.0
B. brydei NSMT-M03538 140.0 26.0 50.5 1.5 10.0 23.0
B. omurai NSMT-M32505 143.5 37.5 55.5 1.5 3.0 20.5
B. omurai NSMT-M32992 88.5 26.0 28.5 1.5 3.0 18.0
B. acutorostrata NSMT-M52713 117.5 40.5 42.0 3.0 9.0 21.0
B. acutorostrata NSMT-M42450 88.0 28.0 30.5 1.5 6.0 18.0
B. acutorostrata OMNH M3400 62.0 24.0 23.0 1.5 6.5 15.5