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943. Decapod Crustaceans from the Eocene Manda Group 1255

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943. Decapod Crustaceans from the Eocene Manda Group 1255 943. Decapod crustaceans from the Eocene Manda Group 1255 Figure 5.1，3, Portunites kattachiensis sp. nov.1,carapace, X 2.0, dorsal view, Noda collection (5927). 3’ carapace, holotype (KMNH IVP 300,016), X2.8, dorsal view. 2, 4-6. Branchioplax pentagonalis (Yo- koyama, 1911)comb. nov. 2, carapace and left cheliped, Noda collection (5927)，X 1.2, dorsal view. 4’ carapace and left cheliped, KMNH IVP 300,018, X 1.5, dorsal view. 5,left and right chelipeds, thoracic sterna and abdomen (plaster cast), KMNH IVP 300,019, x 1.5, ventral view, 6，carapace, ESN 80005，x2.0, dorsal view. 1256 Hiroaki Karasawa intestinal lobe is small. Gently raised he- described this species on the basis of a single patic regions are well differentiated. The broken specimen obtained from a depth of epibranchial lobes are gently swollen and 484 feet of a shaft at the Miike Coalfield. At arched anteriorly. The meso- and metabran- that time, he considered the species to be most chial lobes are also gently swollen. The closely allied to Xanthilites bowerbankii Bell, orbitofrontal margin occupies 0.6-0.7 of the 1858 from the Eocene of the Isle of Sheppey, carapace width. The frontal margin is England. Examination of a recently ob- straight, divided medially by a V-shaped tained well-preserved carapace, remaining notch, and finely granulated, and a shallow associated chelipeds, thoracic sterna and a sinus separates it from an obscure inner fragmentary abdomen indicate that this orbital angle. The upper orbital margin is species should be transferred from Xanthilites wide and pierced by two shallow notches Bell, 1858 to Branchioplax Rathbun, 1916. laterally. Gently arched anterolateral mar- B. pentagonalis closely resembles B. washin- gins are 0.4 of the width ； there are five teeth gtoniana Rathbun, 1916 from the Eocene of including the postorbital tooth ； the 1st tooth Alaska (Rathbun, 1926 ； Tucker and Feld- is small and triangular in outline ； the 2nd is mann, 1989), but differs in having a longer the largest and broadly triangular in outline ； carapace and a finely granulated frontal the 3rd-5th are forwardly directed and acute- margin which is separated from an obscure ly triangular in outline, and the 5th is smal- inner orbital angle by a shallow sinus. A lest. Gently convex posterolateral margins longer carapace and five anterolateral teeth are 1.2 times as long as the anterolateral readily distinguish B. pentagonalis from B. margins and the posterior angle is broadly concinna Quayle and Collins, 1981 from the rounded into a slightly convex posterior Eocene Barton Clay of England. B. margin. pentagonalis differs from B. sulcata Miiller Abdomen of male : The 7th somite is tri- and Collins, 1991 from the Late Eocene angular in outline. The 6th, longest, is wider Szepvolgy Formation of Hungary by having than long, with straight, parallel lateral mar- well defined dorsal regions of the carapace. gins. The 5th and 4th somites are also wider Repository.—YM^U IVP 300, 017-300, than long and their lateral margins taper 019; ESN80005 ； Noda collection (5927). anteriorly. The 3rd somite is narrow. The 2nd and 1st somites are not preserved. Discussion Sternites 1 to 3 are missing and the 4th is broken ； sternites 5 and 6 are wider than 1 he Middle Eocene decapod fauna from long ； the 7th is narrower than the Dreceding the Manda Group is represented by five two and the 8th is reduced in size. species ； four species, Callianassa muratai The finely granulated chelipeds are stronglv Nagao, 1932, C elongatodigitata Nagao, heterochelate, the major being rather more 1941, Ranidina teshimai Fujiyama and Ta- than half as long as the minor cheliped. The keda, 1980, and Portunites hexagonalis slender dactylus is gently curved ventrally and Nagao, 1941 have been described from the there seem to be four teeth diminishing in size Late Eocene Poronai Formation of Hok- distally on the occludent margin. The iixed kaido. Except for Portunites, decapods of finger is as long as the dactylus and possesses the Manda Group have nothing in common a longitudinal shallow groove on the with those of the Poronai Formation. In ventrolateral surface. The palm is longer addition, the raninids are represented by than the dactylus. different genera. The pereiopods are ovate in cross section. Both Eucalliax and Raninoides have living Discussion.—Yokoyama (1911) originally species, while Prohomola, Portunites and 943. Decapod crustaceans from the Eocene Manda Group 1257 Branchioplax are restricted to the Palaeogene. 1830 Collegit, Nods, Observationibus et Adum- Whereas the fossil species of Eucalliax and brationious lllustravit. i-xvn, i-xxxi, ix-xvi + 243 Prohomola are endemic, those of Raninoides, p., pis A-J, L-Q, 1-� . Lugduni-Batavorum, Leiden. Portunites and Branchioplax are recorded Jenkins, R.J.F., 1977 : A new fossil homolid crab from the Palaeogene of North America, Cen- (Decapoda, Brachyura), Middle Tertiary, south- tral America, Senegal, England and Hungary eastern Australia. Trans. Roy. Soc. South Aus- (Rathbun, 1926 ； van Straelen, 1933 ； Remy tralia, vol. 101，p. 1-10. and Tessier, 1954 ； Quayle and Collins, 1981； Latreille, P.A., 1825 : Entomologie, ou histoire Mliller and Collins, 1991). Accordingly, the naturelle des crustaces, des arachnides et des insects. Genre de Crustaces Encyclopedie Meth- occurrences of Raninoides, Portunites and odique, Histoire Naturelle, vol.10, 832 p. Paris. Branchioplax show that the decapod fauna Manning, R.B. and Felder, D.L., 1991:Revision of from the Middle Eocene Manda Group is the American Callianassidae (Crustacea : related to the western and central Tethyan Decapoda: Thalassinidea). Proc. Biol. Soc. realms. Washington, vol. 104, no. 4, p. 764-792. Matsusnita, H.’ 1949 : A summary of the Palaeogene stratigraphy of northern Kyushu. Mem. Fac. References cited Sci. Kyushu Univ., ser. D, vol.2, p. 91-107. Milne Edwards, H.,1837: Histoire naturelle des Bell,T.,1858 : A monograph of the fossil malacos- crustaces, comprenant Vanatomie, la physiologie tracous Crustacea of Great Britain. Part I, et la classification de ces animaux. vol.2, 532 p. Crustacea of the London Clay. 44 p.,11 pis. Paris. Palaeontographical Society, London. ,1852 : De la famille des ocypodides ,1863 : A monograph of the fossil malacos- (Ocypodidae). Second Memoire. Observations tracous Crustacea of Great Britain. Part II, sur les affinites zoologiques et la classification Crustacea of the Gault and Greens and. 40 p., naturelle des Crustaces. Ann. Sci. Nat., ser. 3 11 pis. Palaeontographical Society, London. (ZooL), vol.18, p. 128-166, pis. 3, 4. Paris. Biffar, T.A., 1970 : Three new species of callianassid Mizuno, A., 1962 : Paleogene and Lower Neogene shrimp (Decapoda, Thalassinidea) from the west- biochronology of West Japan. Part II. Jour. ern Atlantic. Proc. Biol Soc. Washington, vol. Geol. Soc. Japan, vol.68, p. 687—693. {in 83, no. 3, p. 35-49. Japanese with English abstract) Bishop, G.A., 1983: Two new species of crabs, ,1963: Paleogene and Lower Neogene DIO- Notopocorystes (Eucorystes) eichhorni and chronology of West Japan. Part III. Jour. Geol. Zygastrocarcinus griesi (Decapoda : Brachyura) Soc. Japan, vol.69, p. 38-50. (in Japanese with from the Bearpaw Shale (Campanian) of North- English abstract). Central America. Jour. Paleont., vol.57, no. 5, ,1964 : Paleogene and Early Neogene molluscan p. 900-911. faunae in West Japan. Rep. Geol. Surv. Japan, ,and Brannen, N.A., 1992 : Homolopsis pikeae, no. 204, p. 72 p. new species (Decapoda), a crab from the ,1992 : Reexamination of the biostratigraphic Cretaceous of Texas. Jour. Crustacean Biol., vol. divisions, Mizuno, 1962-'63, for the Paleogene in 12, no. 2, p. 317-323. western Kyushu, based on current age determina- Fujiyama, I. and Takeda, M.,1980 : A fossil raninid tion data. Geol Soc. Japan, Abstracts with crab from the Poronai Formation, Hokkaido, Programs, 99th Ann. Meet., p. 179. (in Japanese) Japan. Professor Saburo Kanno Memorial Mliller, P. and Collins, J.S.H.,1991:Late Eocene Volume, p. 339-342, pis. 39, 40. Tsukuba. coral associated decapods (Crustacea) from Hun- Guinot, D. and Forges, B.R. de, (in press) : Crustacea gary. Contr. Tert. Qua tern. Geol., vol.28, nos. 2, decapoda : La famillie des Homolidae de Haan, 3, 47-92, 8 pis. 1839. In, A. Crosnier, ed., Resultats des Nagao, T.,1926 : Palaeogene stratigraphy of Kyu- Campagnes MUSORSTOM, Mem. Mus. natn. shu, Japan. Part 6. Japan. Jour. Geol. Geogr., no. Hist nat” Paris. 452, p. 596-601. (in Japanese) Haan, W. de., 1833-1850: Crustacea. In, von ,1928 : Palaeogene fossils of the Island of Kyu- Siebold, P.F., Fauna Japonica sive Descriptio shu, Japan. I. Sci. Rep., Tohoku Imp. Univ., ser. A nimalium, quae in Itinere per Japoniam, Jussu 2，vol.9, no. 3，p. 97-128, pis. 17-22. et A uspicus Superiosum, qui Summum in India ,1932 : Two Tertiary and one Cretaceous Crus- Batava Imperium Tenent, Suscepto, Annis 1823- tacea from Hokkaido, Japan. Jour. Fac. Sci., 1258 Hiroaki Karasawa Hokkaido Univ., ser. 4, vol.2, no.1,p. 15-22, pi. Straelen, V. van, 1933 : Sur des crustaces decapodes 4. cenozoiques du Venezuela, Bull. Musee royal ,1941:On some fossil Crustacea from Japan. d'Hist. nat. Belgique. vol.9, no.10, p. 1-14. Jour. Fac. Set, Hokkaido Univ., ser. 4, vol.6, Tomita, S., Ishibashi., T. and Hara, M.,1992 : A brief nos.1,2, p. 86-100, pi.26. note on the Paleogene of the Miike Coalfield in Ozaki, M. and Hamasaki, S.,1991:Fission track the Omuta district, Middle Kyushu, Japan. Sci. ages of the Paleogene strata in the northern part Rep., Dep. Earth Planet. Sci., Kyushu Univ., vol. of Fukuoka Prefecture, Southwest Japan. Jour. 17, no. 2, p. 25-43, pis 2-18. (in Japanese with Geol. Soc. Japan, vol.97, no. 3, p. 251-254. (in English abstract) Japanese) Tucker, A.B.
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