Browsing by Author "Batten, Roger Lyman."
Now showing 1 - 11 of 11
Results Per Page
Sort Options
Item Early Triassic gastropods from the Sinbad member of the Moenkopi Formation, San Rafael Swell, Utah. American Museum novitates ; no. 2864(New York, N.Y. : American Museum of Natural History, 1986) Batten, Roger Lyman.; Stokes, William Lee, 1915-"The Sinbad gastropod fauna is important because it is the most diverse early Triassic fauna known, with 16 genera and 26 species, 22 of which are new. It is not a typical offshore marine fauna like those found in the post-Scythian. It consists of enormous numbers of embryonic shells and small-size species in coquinal limestones. Pelecypods are equally abundant but are poorly preserved and show even less diversity. Ammonoids, important as index fossils, are present but rare. Sponges, echinoderms, algae, and conodonts are also represented by scattered individuals. All other rocks of Scythian age have yielded just a few species representing conservative, long ranging genera such as Worthenia, Coelostylina, Naticopsis, or Omphaloptychia also found in the Sinbad. In addition, the Sinbad fauna contains the trochids Boutillieria, Natiria, and Chartronella; the neritids Vernelia and Neritaria; the loxonematids Zygopleura, Kittliconcha, and Anoptychia; the cerithid Promathilda; the subulitid Strobeus, and the opisthobranch Cylindrobullina. Sedimentary evidence suggests that the Sinbad fauna was distributed in a subtidal lagoonal environment in an arid climate"--P. [1].Item Pennsylvanian (Morrowan) gastropods from the Magdelena Formation of the Hueco Mountains, Texas. American Museum novitates ; no. 3122(New York : American Museum of Natural History, 1995) Batten, Roger Lyman."The Hueco Mountain Magdalena gastropod fauna is important because it is the only known, diverse Pennsylvanian marine fauna occurring in limestones within the continental United States. This faunal element has some ecological continuity with the Permian sequences above it and is unique in having four terrestrial species not previously known to occur in marine sequences. A mixture of land and marine snails has never been observed before in the Paleozoic fossil record. The most common faunal elements in addition to the gastropods include hexactinellid sponges, crinoids, and several types of Foraminifera indicating an offshore environment, and this formation is, in fact, near the eastern margin of the Paleozoic Orogrande basin. The fauna is silicified so that recovery of all ontogenetic stages was possible along with many statistically significant population samples. The following are new species: Apachella powwowensis, Ferganospira acteonina, Borestus magdalenensis, Borestus texanus, Glyptospira quadriserrata, Trachydomia turbonitella, and Stegocoelia (Donaldospira) nodosa"--P. [1].Item Permian Gastropoda of the southwestern United States. 2, Pleurotomariacea : Portlockiellidae, Phymatopleuridae, and Eotomariidae. Bulletin of the AMNH ; v. 114, article 2(New York : [American Museum of Natural History], 1958) Batten, Roger Lyman.; Cooper, G. Arthur (Gustav Arthur), 1902-; Newell, Norman Dennis, 1909-; Knight, J. Brookes (James Brookes), 1888-1960."The development of a mass etching program for the recovery of silicified fossils from Permian limestone of west Texas has resulted in the accumulation of a large number of fossil gastropods and has made possible the present systematic study of the pleurotomarian gastropods. Most of the collections used herein were made by, or under the direction of, G. Arthur Cooper, Norman D. Newell, and J. Brookes Knight. These collections were obtained from the Wolfcamp, Leonard, and Word formations of the Glass Mountains of Texas and from the Hueco, Bone Spring, and Cherry Canyon formations of the Sierra Diablo and Guadalupe Mountain region. Comments on stratigraphy are made for the orientation of the reader. Little original stratigraphic work has been done, except to verify or corroborate correlations based on other fossil groups. A few of the paleoecological relationships are discussed, with particular emphasis on molluscan assemblages in the Glass Mountains. An instance is cited of a relationship between a Heliospongia and Glyptotomaria (Glyptotomaria) marginata. Statistical methods used include those based on univariate analysis and on allometric growth line comparisons. This latter type of analysis is based on the relative growth line, as estimated by the reduced major axis. Discrimination was based, in part, on a comparison of slope and position differences of the relative growth line between samples. Studies of the logarithmic spiral show that it can be useful in the study of pleurotomarians and may be treated statistically. The value of the logarithmic spiral formula as a discriminatory character must be weighed against the time and labor required in its derivation. Gross measurements of the spiral, such as the use of suture ratios, tend to reduce expenditure of time, but they also reduce accuracy. Some of the directional and non-directional variations within species and genera are noted. This study attempts to show some aspects of pleurotomarian speciation during the Permian. These are particularly well illustrated in the genus Tapinotomaria. Studies of population structure made it possible to understand some of the changes thought to be responsible for most speciation in the families studied. Emphasis is placed on ontogenetic growth characters. The bulk of this paper is devoted to an analysis and description of the rich and heretofore unknown Permian pleurotomarian faunules. The general increase in knowledge about Permian representatives of the superfamily Pleurotomariacea is briefly discussed. Two families, Portlockiellidae and Phymatopleuridae, are diagnosed and discussed. The family Eotomariidae Wenz, 1938, is redefined and expanded. Thirteen genera are discussed herein: Lamellospira and Lacunospira are new; Eirlysia, Tapinotomaria, Discotomaria, Callitomaria, and Shwedagonia are discussed for the first time (see Batten, 1956). Tapinotomaria and Shwedagonia have been discussed at some length because of their interesting evolutionary developments. Five previously described genera are also included, Euconospira, Spiroscala, and Glyptotomaria are redefined; Phymatopleura and Paragoniozona are discussed. A total of 32 species are included, 28 of which are new and named"--P. 159.Item Permian Gastropoda of the southwestern United States. 7. Pleurotomariacea : Eotomariidae, Lophospiriidae, Gosseletinidae. American Museum novitates ; ; no. 2958.(New York, N.Y. : American Museum of Natural History, 1989) Batten, Roger Lyman.Item Permian gastropods and chitons from Perak, Malaysia. Part 1, Chitons, bellerophontids, euomphalids and pleurotomarians. Bulletin of the AMNH ; v. 147, article 1(New York : [American Museum of Natural History], 1972) Batten, Roger Lyman."One of the richest Permian gastropod faunas of Asia was found during intensive field work conducted by the Geological Survey of Malaysia. Discovered in the H.S. Lee Mine no. 8 near Kampar, Perak, it rivals any known Permian fauna with the exception of the Permian of west Texas. Twenty-eight species of bellerophontids and pleurotomarians are herein described, including one new genus, Ambozone, one new subgenus, Glabrocingulam (Stenozone), and 11 new species. The dominant pleurotomarian family is the Eotomariidae which is also the most diverse group in other Permian faunas. The fauna resembles those described from other regions of Southeast Asia, but includes genera hitherto known only from the Sosio beds of Sicily and the Permian of west Texas. The Malaysian fauna is important because it gives a much more complete picture of the Tethyan gastropods of eastern Asia and because of important new species which greatly enlarges our understanding of Upper Paleozoic gastropod phylogeny. The fauna also aids in demonstrating the existence of marine seaways from Sosio, Sicily eastward to Texas and possibly South America"--P. 5.Item Permian gastropods from Perak, Malaysia. Part 2, The trochids, patellids and neritids. American Museum novitates ; no. 2685(New York, N.Y. : American Museum of Natural History, 1979) Batten, Roger Lyman."This is a continuation of a study of Permian gastropods from the misellina claudiae zone from the H.S. Lee Mine no. 8 near Kampar, Perak, Malaysia. The fauna constitutes one of the richest, most diverse known in the Permian, providing a critical base in the eastern Tethys. New species of Sallya Yochelson, 1956, and Dichostasia Yochelson, 1956, record their presence for the first time outside of the west Texas region. One species of patellids is recorded, 10 species of trochids, four new, and nine species of neritids, three new, are described. Most of the neritids are similar to morphotypes found from Djebel Tebaga east to Mongolia. Key characters in Trachydomia imbricata, new species, suggest an ancestral relationship to Neritopsis. Wall ultrastructure is reported and discussed for Trachyspira delphinuloides Gemmellaro, 1889, and for the Recent Neritopsis radula Linné, 1758"--P. [1].Item Permian gastropods from Perak, Malaysia. Part 3, The murchisoniids, cerithiids, loxonematids, and subulitids. American Museum novitates ; no. 2829(New York : American Museum of Natural History, 1985) Batten, Roger Lyman."This is the final part of a study of Permian gastropods from the Misellina claudiae zone from the H. S. Lee Mine No. 8, near Kampar, Perak, Malaysia. The fauna constitutes one of the richest and most diverse known in the Permian-91 species of 52 genera. Included in this portion of the study are analyses of species of the murchisoniids, loxonematids, cerithiids, subulitids, nerineids, pyramidellids, and trochids. This study now provides the best documented Permian gastropod fauna of the Eastern Hemisphere. There are 33 new species of a total of 41 and 4 new genera described herein. The genera belong to the Murchisoniidae, Loxonematacea (incertae sedis), Procerithiidae, and the Nerineidae; the latter two families are important Mesozoic groups reported for the first time in the Paleozoic. The presence of these and other dominant post-Triassic families and the presence of Paleozoic groups in the Triassic serve as additional evidence that a catastrophic event did not affect gastropods at the end of the Permian as it might have in nonmolluscan groups. Of interest is the recognition of a number of species which have very similar morphologies to species from the North American Pennsylvanian, particularly among Retispira, Naticopsis, Trachidomia, Worthenia, Orthonema, and Pseudozygopleura. The presence of an unusually large number of siphonate species (18) in the fauna may indicate the beginning of the exploitation of infauna habitats, perhaps in response to the origin of predation"--P. [1].Item The Scissurellidae : are they neotenously derived fissurellids? (Archeogastropoda). American Museum novitates ; no. 2567(New York, Ny.Y. : American Museum of Natural History, 1975) Batten, Roger Lyman."Comparative anatomical studies have been made of the families Scissurellidae, Pleurotomariidae, and Fissurellidae. Shared primitive characters such as paired organs and shared derived characters like epipodial tentacles, indicate that the Scissurellidae should be removed from the Pleurotomariacea, despite nearly identical external morphology, and placed in the Fissurellacea. The only available pleurotomariaceans when the scissurellids appeared in early Cenozoic time are the haliotids and the Pleurotomariidae. Neither family has as many shared characters as the scissurellids and the fissurellids. A study of the ultrastructure of the scissurellids further justifies this decision. Ultrastructure normally is quite conservative in major taxa. The pleurotomarians have a complex prismatic-nacreous wall, whereas the scissurellids have a simple prismatic-'type-2 crossed-lamellar' wall. This latter wall type is found in the embryonic stage only of the fissurellids; in adults the wall is crossed-lamellar-crossed-lamellar. The early embryonic stages of the fissurellids are similar or nearly identical with all growth stages in the scissurellids. This observation suggests that the scissurellids might have been neotenously derived from the fissurellids. The scissurellids are remarkably convergent on several genera of the Upper Paleozoic Eotomariidae and the Triassic Temnotropidae in external morphology"--P. [1].Item Shell structure of the Galapagos Rift limpet Neomphalus fretterae McLean 1981, with notes on muscle scars and insertions. American Museum novitates ; no. 2776(New York, N.Y. : American Museum of Natural History, 1984) Batten, Roger Lyman."The principal shell layers of Neomphalus fretterae McLean, 1981, are an inner concentric crossed-lamellar and an outer complex crossed-lamellar layer. The protoconch is unusual in being composed of four layers rather than one or two as in most other gastropods. The narrow, high-angled crossed-lamellae of the inner principal layer are nearly identical with those of advanced mesogastropods, rather than the broader, low-angled archeogastropod crossed-lamellae. This, along with shell shape, ornament, and the presence of a muscle platform suggests a closer relationship with the mesogastropod limpets than with the archeogastropods. Muscle attachment is by direct muscle fiber insertion, forming tubules in the shell, and also by myo-adhesive epithelial cells which may form a myostracal layer. Based on the multiple layers found in the protoconch, I speculate on the possibility that the larval stage may have remained planktonic for an extended period"--P. [1].Item Shell ultrastructure of the Atlantidae (Heteropoda, Mesogastropoda) Oxygyrus and Protatlanta, with comments on Atlanta inclinata. Bulletin of the AMNH ; v. 157, article 4(New York : American Museum of Natural History, 1976) Batten, Roger Lyman.; Dumont, Michael P."The purpose of the present study is to describe and interpret the wall ultrastructure of three atlantid heteropod species for phylogenetic and taxonomic analysis; they are Oxygyrus keraudreni, Protatlanta souleyeti, and Atlanta inclinata found in shallow waters of subtropic and tropic oceanic regions. Whereas most other members of predominantly thick-shelled, benthic mesogastropod families have three or more calcified crossed-lamellar layers termed here 'normal,' the exceedingly thin-walled planktonic atlantids have highly modified, crossed-lamellar layers termed here 'Type-2.' This 'Type-2' structure was perhaps derived from the normal mesogastropod type structure as a result of thinness of the wall, as this structure has been observed in unrelated thin-shelled taxa, such as pteropods (opisthobranchs), scissurellids (archaeogastropods), and early embryonic stages of fissurellids (archaeogastropods). An important variation is that both the first-order lamellae and the second-order rods may be rigid 'Type-2,' sigmoidal, or curved so that a layer may resemble helical structure. A new type of prismatic layer, asymmetric prismatic, is described and distinguished from simple prismatic, apertural prismatic, and myostracal structure. Variations of ultrastructure within samples of Oxygyrus keraudreni from the same population were found to have variant patterns identical with those of distant populations. Ornamented and unornamented embryonic Protatlanta souleyeti were found within populations in about the same ratio. The wall structure among Oxygyrus keraudreni, Protatlanta souleyeti, and Atlanta inclinata is distinct, with variations that can be used to distinguish each species. Embryonic variations of ultrastructure are characterized by changing thickness of wall structure during growth, whereas adult variations of ultrastructure are characterized by morphologic changes within a specific wall unit type. A study of heteropod material from plankton tows and bottom dredges failed to establish any recognizable difference in alteration of ultrastructure by selective solution in deep sea sediments. Both types of samples displayed about the same degree of alteration, implying that factors either biological or chemical are operating on individuals even during their life cycle"--P. 267.Item The ultrastructure of five common Pennsylvanian pleurotomarian gastropod species of eastern United States. American Museum novitates ; no. 2501(New York, N.Y. : American Museum of Natural History, 1972) Batten, Roger Lyman."The shell ultrastructure of five pleurotomarian gastropod species from the Pennsylvanian is described and and variation discussed; in addition, some observations are made of three bellerophontid species. Two thin outer shell layers previously unknown are analyzed. The outermost of these is fibrous and about 10 [microns] thick; it appears to be the only one that is actually involved in the topographic expression of growth. The two principal layers of the species studied are an outer complex prismatic layer and a thicker inner nacreous layer. There is an innermost complex prismatic unit which is variable in development and may be absent in some species. Several types of pallial myostracum are present in all species examined. The importance of shell structure in elucidating the origin and phylogeny of molluscan groups is briefly discussed. Most variation of ultrastructure appears to occur within or between species and is quite conservative between larger taxonomic units"--P. [1].