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Indian Fossil Monocotyledons: Current Status, Recent Developments and Future Directions The Palaeobotanist 57(2008) : 141-164 0031-0174/2008 $2.00 Indian fossil monocotyledons: Current Status, Recent Developments and Future Directions S.D. BONDE Agharkar Research Institute, G.G. Agarkar Road, Pune 411 004, India. Email: [email protected] (Received 03 August, 2006; revised version accepted 17 April, 2008) ABSTRACT Bonde SD 2008. Indian fossil monocotyledons: Current Status, Recent Developments and Future Directions. The Palaeobotanist 57(1-2) : 141-164. The megafossil records of monocotyledons assigned to Upper Cretaceous (Maastrichtian) onward from India have been reviewed along with their possible resemblances with the extant members to have a meaningful taxonomic and phylogenetic relationship. The early record of angiosperm megafossils assigned to the dicotyledons is from the Lower Cretaceous horizon of Rajmahal Hills, Bihar (now Jharkhand). A thorough search for the monocotyledons is yet to be made from these beds. The Deccan Intertrappean beds which belong to Maastrichtian (Upper Cretaceous) - Palaeocene age, are very rich in angiosperms comprising both dicotyledons and monocotyledons preserved especially in the form of permineralizations. The later epochs or series, however, are rich in compressions and impressions. The monocotyledonous flora is dominated mainly by palms (Family-Arecaceae) followed by the families of Scitamineae, Poaceae, Cyperaceae and Araceae. In order to understand the early monocotyledonous diversification future work is to be concentrated in the Rajmahal Intertrappeans and contemporary horizons belonging to the Lower Cretaceous Period. Thorough search for entire herbaceous elements, woody juvenile and arborescent members (palms, pandans, aroids, liliales, grasses, Cyperaceae, etc.), reconstructions of entire plants based upon organic occurrences and associations in addition to the isolated reproductive and vegetative organs of taxonomic significance is to be given priority. In depth knowledge of morphology and anatomy of comparable extant flora is required for their phylogenetic assessments. Key-words—Morpho-taxonomy, Monocotyledons, Megafossils, India. Hkkjrh; thok’e ,dcht i=h% orZeku n’kk] vfHkuo izxfr ,oa Hkkoh fn’kk;sa ,l-Mh- cksaMs lkjka'k Hkkjr ls izkIr ,dcht i=h ds LFkwy thok’e vfHkys[kksa dh Åijh fØVsf'k;l ¼ekLVªhf'k;u½ ls vkxs fu/kkZfjr fon~;eku lnL;ksa ls mudh laHkkfor le:irk lfgr lkFkZd oxhZdj.kkRed ,oa tkfro‘fRr; laca/kRo dh leh{kk dh xbZ gSA n~fochth dks fu/kkZfjr vko~rchth LFkwy thok’eksa dk igys dk vfHkys[k jktegy igkM+h] fcgkj ¼vc >kj[kaM½ ds fuEu fØVsf'k;l f{kfrt ls gSA bu laLrjksa ls ,dcht i=h gsrq laiw.kZ [kkst vHkh gksuh gSA ekLVªhf'k;u ¼Åijh fØVsf'k;l½&iqjkuwbu ;qx dh nDdu var%Vªkuhu laLrjsa fo’ks"kr% [kfud :i esa ifjjf{kr n~fochth ,oa ,dchth i=h nksuksa lfUufgr vko‘rchth izpqj gSaA fQj Hkh] ckn dk ;qx ;k Js.kh] laihMk’e ,oa eqnzk’e izpqj gSaA ,dcht i=he; ouLifrtkr eq[;r% rkM+ ¼,jSdslh&ifjokj½ ds vuqorhZ lkbVkfejslh] iks,lh] lkbiszlh rFkk ,jslh n~okjk fu;af=r gSA izkjafHkd ,dcht i=he; fofo/k:i.k dks le>us gsrq jktegy varjVªksfi;u rFkk fuEu fØVsf'k;l vof/k dh ledkfyd laLrj&fLFkfr;ksa ij 'kks/kdk;Z ij /;ku nsus dh t:jr gSA dkcZfud izkfIr;ksa ,oa laxq.ku foyx iqumZRiknh ds vykok rFkk oxhZdj.k lkFkZdrk ds ouLifr vaxksa ij vk/kkfjr lewps 'kkdh; rRoksa dk"Bh; cky ,oa o`{kle lnL;ksa ¼rkM+] izSaMUl] ?kqbZ;k¡] fyfy,sYl] ?kkl] lkbizslh bR;kfn½] lwqph ouLifr dh iqulZajpuk gsrq c`gr [kkst dks izkFkfedrk nsus dh t:jr gSA rqyuh; fon~;eku isM+&ikS/ks dh vkd`fr foKku ,oa 'kjhj dh laiw.kZ tkudkjh muds tkfro`Rrh; fu/kkZj.k ds fy, vko’;d gSaA laDsÿr&'kCn—vkd`fr&okfxZdh] ,dcht i=h] LFkwy thok’e] HkkjrA Challenges in Indian Palaeobiology: Current Status, Recent Development and Future Directions © Birbal Sahni Institute of Palaeobotany, India Editors: N.C. Mehrotra & Mukund Sharma Publisher: Birbal Sahni Institute of Palaeobotany, Lucknow 142 THE PALAEOBOTANIST INTRODUCTION Diversity of Monocotyledons Following megafloral elements have been listed from monograph on Revision of Fossil Monocotyledons from different geological horizons in India. They have been A India was published posthumously in the name of Birbal arranged in alphabetical order of family, name of the genus, Sahni in 1964. Although Daghlian (1981) reviewed the world species, authority, year of publication, organ of the plant body, record of fossil monocotyledons, it hardly represented the affinity or resemblance with the extant and / or extinct members Indian material. The fossil record of monocotyledons has been wherever possible, locality, horizon and age. The question reviewed here in view of the huge amount of published work mark (?) indicates the need for reassessment for the affinity of and the recent morpho-anatomical investigations on extant the fossil. plants. Angiosperms comprise a dominant plant group Agavaceae throughout the world today having 2,58,650 species distributed Dracaena- wood (Ambwani, 1982, 1999). Axis. Neyveli, District in 490 families. Of these, the monocotyledons constitute 59,300 South Arcot, Tamil Nadu. Miocene. species assigned to 112 families comprising about 25% of the Neyvelia awasthii Reddy (1995). Axis comparable to Dracaena angiosperms (Thorne, 2002). Plants in the past, as today, lived Vand. ex L. Neyveli, District South Arcot, Tamil Nadu. in various habitats. However, those growing in or near the Miocene. areas of sedimentary depositions had a chance of preservation. The megafossil record of monocotyledons is very meagre in Amaryllidaceae comparison to the number of extant members. The fossil record Crinum eocenum Patil & Upadhye (1990). Pseudostem may be scanty because majority of them are herbaceous in comparable to Crinum asiaticum L. (?). Mohgaonkalan, nature and do not get readily fossilized like those of the woody District Chhindwara, Madhya Pradesh. Deccan plants. They are described as permineralizations, impressions Intertrappeans. Upper Cretaceous (Maastrichtian). and compressions assigned to the families Agavaceae, Alismataceae, Amaryllidaceae, Aponogetonaceae, Araceae, Araceae Arecaceae (Palmae), Bromeliaceae, Butomaceae, Cannaceae, Rhizocaulities palaeocenicus (=Rhizocaulon palaeocenicum Centrolepidaceae, Ceratophyllaceae, Commelinaceae, Mehrotra, 2000) Mehrotra (2003). Rhizome comparable Cyclanthaceae, Cymodoceaceae, Cyperaceae, Dioscoreaceae, to Aglaonema Schott. (?). It appears to be a rhizome of Dracenaceae, Heliconiaceae, Hydrocharitaceae, Juncaceae, Zingiberaceae. Buruai Colliery near Jowai, District Jaintia Juncaginaceae, Lemnaceae, Liliaceae, Marantaceae, Hills, Meghalaya. Upper Palaeocene. Musaceae, Najadaceae, Orchidaceae, Pandanaceae, Poaceae Rhodospathodendron tomlinsonii Bonde (2000). Aerial viny (Gramineae), Pontederiaceae, Potamogetonaceae, stem comparable to Rhodospatha Poepp. & Endl. Restionaceae, Smilacaceae, Sparganiaceae, Stemonaceae, Nawargaon, District Wardha, Maharashtra. Deccan Strelitziaceae, Taccaceae, Typhaceae, Xyridaceae, Intertrappeans. Upper Cretaceous (Maastrichtian). Zingiberaceae and Zosteriaceae (Collinson et al., 1993). Viracarpon elongatum Sahni (1944) (= Shuklanthus superbum Propalmophyllum liasinum Lignier (1895), Verma, 1958; Chitaley & Patil, 1971); (= V. chitaleyi Patil, Alismaphyllum victor-masoni (Ward) Berry (1911), 1972; Bande & Awasthi, 1986). Infructescence. Takli near Sanmiguelia lewisii Brown (1956), and Acaciaephyllum Nagpur, Maharashtra; Mohgaonkalan, District spatulatum Fontaine (Doyle, 1973; Hickey & Doyle, 1977) are Chhindwara, Madhya Pradesh. Deccan Intertrappeans. the pre-Cretaceous records from the world. Angiospermous Upper Cretaceous (Maastrichtian). record prior to Maastrichtian from India is meagre and is known V. hexaspermum Sahni (1934) (= V. sahnii Chitaley et al., 1969; only from the Rajmahal Intertrappeans. However, many of them Bande & Awasthi, 1986), Chitaley (1954, 1958), Nambudiri belong to the dicotyledons (Vishnu Mittre, 1956; Tripathi & & Tidwell, 1978), Mahabale (1979). Infructescence Tiwari, 1991; Tiwari & Tripathi, 1995; Sharma, 1997; Banerji, comparable to Mulberry like fruits of Moraceae, Araceae 2000). The succeeding Deccan Intertrappean flora of the (Monstera deliciosa Liebm., Amorphophyllus Blume ex Maastrichtian (Upper Cretaceous) age, however, is very rich Decne. and related genera) (?). The affinities have also in monocotyledonous remains, along with the dicotyledons been suggested with families Cyclanthaceae and in comparison to the other Cretaceous or Early Tertiary floras. Pandanaceae. Takli near Nagpur, Maharashtra; Mahurzari, The monocotyledonous flora is dominated by palms (Family– District Nagpur, Maharashtra; Mohgaonkalan, District Arecaceae) followed by Poaceae, Araceae, Musaceae, Liliaceae, Chhindwara, Madhya Pradesh. Deccan Intertrappeans. Cyperaceae, Agavaceae, Pandanaceae and others. It also Upper Cretaceous (Maastrichtian). shows the sudden dominance of angiosperms. BONDE—INDIAN FOSSIL MONOCOTYLEDONS 143 Arecaceae (Palmae) P. feistmantelii Rao & Achutan (1969). Comparable to Stems Mauritia- like palms (?). Mohgaonkalan, District Palmoxylon anjarii Guleria (2005). Viri, South of Anjar, Chhindwara, Madhya Pradesh. Deccan Intertrappeans. Kachchh. Anjar Formation. Upper Maastrichtian to Upper Cretaceous (Maastrichtian). Danian. P. fibrosum Menon (1965a). Mohgaonkalan, District P. arcotense Ramanujam (1953). Comparable to Livistona R. Chhindwara, Madhya Pradesh. Deccan Intertrappeans. Br. (?). Tiruchhitambalam, Pondicherry. Tertiary (?). Upper Cretaceous (Maastrichtian). P. arviensis Ambwani (1981). Nawargaon, District Wardha, P. ghoshii Bera & Banerjee (1990, 2001).
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