A New and Ontogenetically Younger Specimen of<i>Numataphocoena yamashitai</i>from the Upper Part of the Horokaoshirarika Formation (Lower Pliocene), Numata, Hokkaido, Japan

Tanaka, Yoshihiro

doi:10.2517/2015pr026

Cited by 6 publications

(1 citation statement)

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“…and some Mysticeti indet. materials from the early Pliocene (about 4.5-3.5 Ma) possibly be cetaceans of the same age [25][26][27][28][29]. From the same area, there are some late Miocene Mysticeti reports: type specimen of Miobalaenoptera numataensis (6.5-6.8 Ma) and a referred specimen Herpetocetus sp.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

A new member of fossil balaenid (Mysticeti, Cetacea) from the early Pliocene of Hokkaido, Japan

Tanaka

Furusawa²,

Kimura

2020

R. Soc. open sci.

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The family Balaenidae includes two genus and four extant species. Extinct balaenids are known for at least four genus and 10 species. The oldest known record of members of the Balaenidae is known from the early Miocene, but still need more early members of the family to provide better phylogenetic hypotheses. FCCP 1049 from the lower part of the Chippubetsu Formation, Fukagawa Group (3.5–5.2 Ma, Zanclean, early Pliocene) was preliminary described and identified as Balaenula sp. by Furusawa and Kimura in 1982. Later works discussed that FCCP 1049 is different from the genus, and is placed in different clade from Balaenula astensis . The result of our phylogenetic analysis places FCCP 1049 basal to Balaenella brachyrhynus , and is again separated from B. astensis. In this study, FCCP 1049 is re-described and named as Archaeobalaena dosanko gen. et sp. nov. Archaeobalaena dosanko is distinguishable from other balaenids by having a deep promontorial groove of the pars cochlearis of the periotic. Archaeobalaena dosanko can be differentiated from other balaenids, except Morenocetus parvus by having a slender zygomatic process, and posteriorly oriented postorbital process in dorsal view. Archaeobalaena dosanko adds detailed skull, periotic and bulla morphologies for the earlier balaenids.

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Section: Systematic Palaeontologymentioning

confidence: 99%