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Palaeontological Society of Japan Transactions and Proceedings of the Palaeontological Society of Japan New Series No. 87 Palaeontological Society of Japan September 30, 1972 Editor: Takashi HAMADA Associate editor: Yasuhide IWASAKI Officers for 1971 -1972 President: · Tokio SHIKAMA Councillors (* Executives): Kiyoshi ASANO*, Kiyotaka CHINZEI*, Takashi HAMADA*, Tetsuro HANAI*, Kotora HATAI, Itaru HAYAMI, Koichiro IcHIKAWA, Taro KANAYA, Kametoshi KANMERA, Tamio KOTAKA, Tatsuro MATSUMOTO*, Hiroshi OZAKI*, Tokio SHIKAMA *, Fuyuji TAKA!*, Yokichi TAKA YANAGI Secretaries: W ataru HASHIMOTO, Saburo KANNO Executive Committee General Affairs: Tetsuro HANAI, Naoaki AOKI Membership: Kiyotaka CHINZEI, Toshio KOIKE Finance: Fuyuji T AKAI, Hisayoshi !Go Planning : Hiroshi OZAKI, Kazuo ASAMA Publications Transactions : Takashi HAMADA, Y asuhide IwASAKI Special Papers: Tatsuro MATSUMOTO, Tomowo OzAWA " Fossils": Kiyoshi ASANO, Toshiaki TAKAYAMA All communications relating to this journal should be addressed to the PALAEONTOLOGICAL SOCIETY OF JAPAN c/o Business Center for Academic Societies, Japan Yayoi 2-4-16, Bunkyo-ku, Tokyo 113, Japan. Sole agent: University of Tokyo Press, Hongo, Tokyo Trans. Proc. Palaeont. Soc. Japan; N.S., No. 87, pp. 377-394, pl. 47, September 30, 1972 601. TWO SMALL DESMOCERATID AMMONITES FROM HOKKAIDO (STUDIES OF THE CRETACEOUS AMMONITES FROM HOKKAIDO AND SAGHALIEN-XXIV)* TATSURO MATSUMOTO!), TATSUO MURAMOT02> and AKITOSHI INOMN> ~l::.ffljitffti:-T:A.:c-e 7 :Af31.'H~~7 :..-'.:C-;1-1 ~ 2 f!fi: -t'O) 1 fi~~}]IJ!I!!)JJ3.!1E.;'f-O)r$-e / ~ =- 7 :..-'0) Mantelliceras japonicum 1\'.'17• t?:>iit L. t: "b 0)'"(', Wfr~Wfrm! C. VC:::.. :::.lr.ilcl!lXT .Qo :::.. hvinl<:f*~O)fE:Q~ 2 em JE.l?:>fO)'J''!!'t', JLI:l~v'ijWiWTrilfi~ "b t:,, mi»EEIB~Jl!:Q~y L. fh LV' .Qo ~~ilfilr.li~am77~f'I C. k C.?J:v'o ~~lifT U~v' < v~~'Li7~mltt,gl]".)lr.lJ.gU.) l?:>~'L.Q o ~-8- ~.~lii7'tJ: f) lJ!*-4ifl:: L. LV' .Q:Q~, fimf*~~i3"JICiJi! .Q C. 7':7. .:C -e 7 :A O)~!j't"C:· £> .Q o :!9J~fi-:l: .Q:::.. "'o ;:.0)~? tJ:!I;t~~~~ff-T'l'J!!O)tO)fi 7 :..-'.:C-;1-1 ~ 0))1fdl::'ii:'.J:v'ov'~:dJ::f.;J.fc.iE)J!i7' !?:> -t":tLf.:,HJ':t1( C. L. L~glib t?:>tL.Q o fl!!f1UC. Fol~iJ~-t'O)iJ1iJZ!~iLU~ .iE1i1iHciJi!tLf, Ji!Jif J:::r:i!!!m ~I%:Ji!.v't.:~~'LLv'.Qo ;::O)"bO)fitcfi!Ji0)7:A.:C-e7:Aill!:fJI.O) .;( /'/~-lr.li::.A:L, £>-:1: fJi! 9E'l:"tJ:v'1:.ffitJtr.\':~"b"" Lv'f.:O)'t'vitl:v'i7'ctiH~~tL.Qo r~ :<fs: ;~ Jl!~ • N :<fs: m t.it -t'0)21i~$~!1!!~0)-lj-/' I· =-7/':Q>t;:,f~l?:>~'Lt.:"bO)'t', Kitchinites (Neopuzosia) O)Wfr l'illC. l..Lilc!ll\1-t'.Qo 7"Y"Y7.i!E.f-'Hcli ;kJ!!O)"bO):Q~~ < ~nl?:>:tLLv'.Qi7~. U'LiiJil<:f*~O)jj[ f~;>7~fli7> 3 em ij!J.!t't'.:li;,.Q C. C. "biC, -t'O)~Q*~ICj!jj~tJ:Jfii;£>.Q:::.. C.:Q;~~'"(:"Ji;,.Qo -t'O) :*Jil<:~~li K. (N.) ishikawai 0)-t'~'LC.~f.C),i'.Q:Qt, JfO)~~O)iJjj;!~ii;T't'lr.~~.lOI?:>h, JiX: f*~'l:"liAJHi.lr.~tJ: .Qo :::.nlr.~iili L. L, '/"" 7 ~ 7 :..-'.:C-;1- 1 ~ 't'llftllii£~~0)~{7~ UHR~ hLv' .Qt~-fr C. O);f:DW:>7t:5(tfj·:Q,~'L.Q OYt". 7"v'"Y7!llil'-'HC.t;lt .Q llf:!Hi~~O) RJfiEiif:.lc '? ~­ r.G~~iL.t::Qt, ~litl'L.0~~13"J't'£>.Qo Jls:!llif-'[0)7 /'.:C-;1-1 r li, -%"i0)~0)~-fr~-~~"b -::>Lv'.Qnt, ;k~~. ~O)~ftffiC.<Ir.{±EJ:}O)~ft[fj, ~I=!O)j1~tJ:ciC.Bv'L, i.PtJ:fJO)M;n f1~~To *fll!li-t" :j L.f.:rJ11::~/iO)-J'ijffi~ff,T~{?IjC.7;1.fJ:~~1,Qo ~*;~f.!r;.mra,AJ1f:il:: for one of them, belonging to the sub­ Introduction family Desmoceratinae, is T. MATSU­ In this paper descriptions and remarks MOTO and T. MURAMOTO and that for are given on two small, peculiar ammo­ the other, belonging to the subfamily nite species which are assignable to the Puzosiinae, is T. MATSUMOTO and A. family Desmoceratidae. The authorship !NOMA. Before going further we thank Dr. Itaru HAYAMI, Miss Yuko WADA and * Received Jan. 23, 1972; read Jan. 20, 1972 at Chiba. Miss Seiko HAY AKA w A in their kind 1) Department of Geology, Kyushu Univer­ assistance in preparing the plates and sity, Fukuoka 812. typescript. For the study of the second 2) Yayoi, Mikasa, Hokkaido 068-22. species we thank the Japan Petroleum 3) Japan Petroleum Exploration Co., Ote­ Exploration Company and Professor Wa­ machi, Tokyo 100. taru HASHIMOTO for their kind support. 377 378 Tatsuro MATSUMOTO, Tatsuo MURAMOTO & Akitoshi !NOMA Systematic description from the Lower Cenomanian of Hokkai­ do. Its comparisons· and affinities with Family Desmoceratidae other genera are to be given after the description of the species. Subfamily Desmoceratinae* Several years ago when we were con­ Microdesmoceras tetragonum MATSU­ centrated in a field work to obtain fossils MOTO and MURAMOTO, sp. nov. from the Cenomanian of the Ikushum­ bets area, central Hokkaido, one of us Pl. 47, Figs. 1-4; Text-figs. 1-4 (T. MURAMOTO) was successful to find four small, peculiar ammonite specimens. Material.-Holotype, GK. H5653, from They show very distinctive characters of loc. Ik 1101, Kami-Katsurazawa, Ikushum­ one and the same species, which requires bets. Three paratypes, of which one a new genus in the Desmoceratinae. from loc. Ik 1101 and another from Ik 1051b are preserved in the MuRAMOTO Genus llficrodesmoceras MATSUMOTO Museum and the last from loc. Ik 1067bp and MURAMOTO, nov. is in Kyushu University (GK.) with re­ Type-species.-Microdesmoceras tetrago­ gister number H5650. The last one has num sp. nov., to be described below. been cut into two main parts and a few Generic diagnosis.-A small desmocera­ minute pieces (of the first whorl) to ex­ tid, with somewhat simplified pattern of amine the characters of the inner whorls. sutural elements, showing a broad and Specific characters.-The shell is small. trifid lateral lobe (L) and somewhat phyl­ The holotype, which is regarded as re­ loid terminals of saddles aligned on a presenting an adult stage, is 18 mm in descending line. Coiling of moderate involution; slight­ ly deviated from normal spire in the last whorl. The body-whorl and the c preceding part of the late, septate whorl characterized by somewhat tetragonal outline in cross-section. The surface of the shell nearly smooth, only with flexu­ ous weak lirae, which show a moderate­ ly projected ct~rve on the venter and another on the middle part of the flank. Gently sigmoid, periodic constrictions marked on the internal mould of late whorls, but not accompanied with a Text-fig. 1. Microdesmoceras tetragonum perceptible elevation on the surface of sp. nov. Diagrammatic sketch of the halo­ the shell. type in two lateral and an apertural views Remarks.-This genus is at present (above). A part of the !irate surface (left) represented by only a single species and constriction on the internal mould (center) are shown. The external part of * The authorship of the description under the second last suture (below) exposed at subfamily Desmoceratinae is Tatsuro MATsu­ s. u.s. =umbilical seam; u.sh. =umbilical MOTO and Tatsuo MURAMOTO. shoulder. · (T. MAT. delin.) 601. Two small desmocemtid ammonites 379 E c U2 U3 U4= 5 U.Jh. t.!.S', Text-fig. 2. Microdesmoceras tetragonum sp. nov. Diagrammatic sketch of a para· Text-fig. 3. Microdesmoceras tetragonum type, from Joe. Ik 1101, in lateral and sp. nov. Diagrammatic sketch of a para­ apertural views (above) and the suture type, from Joe. Ik 105lb, in lateral and exposed at s. (T. MAT. delin.) apertural views (above) and the external part of the last suture exposed at s. (T. MAT. delin.) diameter. The involution is moderate and the umbilicus is of moderate width, about 34(±1) percent of the shell diame­ flank and then recurved at the ventro­ ter. The mode of coiling of the adult lateral part passing to a moderate ven­ whorl, as seen in the holotype, is slightly tral projection. The lateral and the deviated from the normal spire, i.e. ventral projections are rounded. The slightly scaphitoid. outline of the apertural margin is not The body-whorl occupies about three precisely known. quarters of the last volution. It is· nearly There are three or four constrictions as high as broad and approximately per whorl in the late growth-stages. tetragonal in cross-section, having flat They are roughly sigmoid on the flank and parallel flanks, a broadly arched but not so much projected as the lirae venter and vertical umbilical walls. The on the venter. They are impressed only preceding septate part of at least a half on the internal mould and the corn~s­ volution has also flat and parallel flanks ponding elevations on the test are but is somewhat broader than high. Still hardly discernible. The constrictions of inner whorls are much broader than high the body-whorl is very faint on the and rounded to reniform in cross-section. flanks but better marked on the venter. They are more evolute than the outer Generally speaking the suture is of whorls. The above mentioned change of desmoceratid type, but is particular in shell-form with growth may be illus· its more simple pattern as compared trated by a cross-section (Text-fig. 4). with those of the nearly contemporary The surface of the shell looks nearly Desmoceras (Pseudouhligella) and Puzosia.
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