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Pearly Nautilus

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Range: to .

The Nautilida is an order of mostly coiled cephalopods, derived from the in the Devonian. Today the order is represented by the modern pearly and its close relative, ; the only two known living genera of shelled cephalopods. However during the late and for much of the this had been a large and diverse group with families and superfamilies.

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Although in Devonian times the shells of nautilids were varied in shape, ranging from through to tightly coiled and , later on the loosely coiled and cyrtoconic shells became rare or disappeared altogether except in the superfamily . Nautiloids thenceforth conformed to the standard , , and involute conch shape (the modern pearly nautilus displays the tightly coiled involute form).

Explains Teichert (1988):

The Nautilida exhibit an infinite variety in degrees of coiling (with no deviations from the planispiral model), whorl cross sections, and surface ornamentations, but no overall trends in any of these features. Sutures were straight or only weakly undulating in almost all genera, with the exception of a few that developed in the among the Trigonoceratidae, in the Late in the Clydonautilidae, Gonionautilidae, and Siberionautilidae, and during the Late and Early among the Hercoglossidae and Aturiidae, all of which have sutures similar to those of certain Upper Devonian genera. Characteristically, are and anywhere from subventral to subdorsal in position. Only few forms have marginal siphuncles, with those of the Late Paleozoic Aipocerataceae and of Triassic being ventral and that of Early Tertiary being dorsal in position.

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Modern nautilids (and it can be assumed many extinct types too) live at some depth but can rise to shallower waters. They feed on fish and invertebrates. There are 38 arms which form a circle around the head. The eyes are small and primitive, and functions rather like a pinhole camera. Above the head and the arms is a leathery, protective hood, that acts like an to protect the animal when it withdraws inside its shell. They produce only a few large and well-developed offspring at a time. Development time inside the egg of more than a year in the Recent Nautilus. It takes three or four years to reach maturity. The adults can spawn several times and may live up to 20 years.

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The early nautilid (Barrande), Early Devonian, Czechoslovakia. A, Dorsal view; B, lateral view; C, longitudinal section of siphuncle (After Barrande, 1865, from Teichert, 1967, from Teichert 1988).

The Nautilida are generally thought to be derived from the , through the Rutoceratidae. Teichert (1988) suggested that the best candidates would be the Acleistoceratidae and the Brevicoceratidae, both of which have curved or coiled shells and septal necks, characteristic of early rutoceratid and ptenoceratid nautilids. Dzik (1984) previously proposed the alternative oncocerid Lechritrochoceratidae.

Earlier ideas include evolution from straight-shelled ("") cephalopods which became progressively more and more coiled (Schindewolf, 1942), or from already coiled Silurian (Barrandeoceratidae Flower & Kummel 1950)

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The oldest of the nautilidae, (Kummel), of New Zealand. A, Ventral view B. Lateral view. Height about 7 cm (after Kummel 1953).

The Nautilida have a rich and complex evolutionary history. The details of and remain obscure, but the general pattern is clear. This , the last of the major groups of to evolve, are also the most successful. The following account is by Teichert (1988):

From modest beginnings in the Lower Devonian (Teichert et al., 1979), the number of genera increased from 1 or 2 in the to at least a dozen in the and about 22 in the Middle Devonian. After a decline in the Late Devonian, with only 3 genera recorded, the order rose to great prominence in the Carboniferous, when some 75 genera and subgenera in some 16 families are known (Shimanskiy, 1967, with additions). After the Carboniferous we witness a steady decline of the order to about 55 genera in 10 or 12 families in the , and about 35 genera in 8 families in the Triassic. Interestingly, the nautilids were much less affected by the great wave of extinctions at the end of the Permian than the contemporary : 3 families and at least 4 possibly 8 genera of nautilids passed from the Permian into the Triassic. Beginning in the Triassic, morphological differentiation of the order declined to a severe setback in the Late Triassic, when, just as today, only one genus, (above), survived (Kummel, 1953). This was followed by a slight recovery in the Late and, especially, Cretaceous with 24 genera (Shimanskiy, 1975; Whetstone and Teichert, 1978), and a final decline during the , at the end of which the order is reduced to a single genus Nautilus.
Interestingly, the nautilids were not affected by the wave of extinctions at the Cretaceous - Tertiary boundary which wiped out their close relatives, the ammonoids; three families and at least five genera of nautilids crossed this boundary and the and saw a resurgence of nautilids, with several new genera added, most of which were of worldwide distribution (Miller, 1949; Kummel, 1956; Shimanskiy, 1979).

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The Nautilida contains five superfamilies, four are late Paleozoic, of which three extend into the Triassic, one is Jurassic to Recent. They are the:





The older and longer established --aceae endings are retained as they more clearly indicate superfamily rank than does the now more ambiguous --oidea ending which in invertebrate science had been an indication of subclass or superorder.


Shimanskiy (1962) divided the Nautilida into 34 families (later (1979) reduced to 30) and 184 genera, whilst Kummel in the Treatise (1964) recognized 24 families and 165 genera. Both agree that the Nautilida is the largest order of the (sensu lato) .

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Nautilida [Lateradulata, Nautilacea, Nautilina]
   |--+-- K64
   |  `--Aipocerataceae [Solenochilaceae, Solenochilida] K64
   |       |-- H99
   |       |-- H99
   |       `--Scyphoceratidae K64
   |            |--Scyphoceras Ruzhentsev & Shimanskiy 1954 K64
   |            |    `--*S. dionysi Ruzhentsev & Shimanskiy 1954 K64
   |            |--Dentoceras Ruzhentsev & Shimanskiy 1954 [Dentoceratidae] K64
   |            |    `--*D. magnum Ruzhentsev & Shimanskiy 1954 K64
   |            |--Mariceras Ruzhentsev & Shimanskiy 1954 K64
   |            |    `--*M. ferum Ruzhentsev & Shimanskiy 1954 K64
   |            `--Venatoroceras Ruzhentsev & Shimanskiy 1954 K64
   |                 `--*V. verae Ruzhentsev & Shimanskiy 1954 K64
   `--+-- K64
      `--Trigonocerataceae [Centrocerataceae, Centroceratida, Centroceratina] K64
           |-- K64
           |-- K64
           `--+--Permoceras Miller & Collinson 1953 [Permoceratidae] K64
              |    `--*P. bitauniense (Haniel 1915) [=Nautilus (Aganides) bitauniensis] K64
              |--+-- K64
              |  `--Syringonautilidae [Clymenonautilinae, Syringonautilinae] K64
              |       |--Clymenonautilus Hyatt in Zittel 1900 [=Clymenionautilus (l. c.)] K64
              |       |    `--*C. ehrlichi (Mojsisovics 1873) [=Nautilus ehrlichi] K64
              |       |--Syringonautilus Mojsisovics 1902 K64
              |       |    `--*S. lilianus (Mojsisovics 1882) [=Nautilus lilianus] K64
              |       |--Juvavionautilus Mojsisovics 1902 K64
              |       |    `--*J. heterophyllus (Hauer 1849) [=Nautilus heterophyllus] K64
              |       |--Oxynautilus Mojsisovics 1902 K64
              |       |    `--*O. acutus (Hauer 1846) [=Nautilus acutus] K64
              |       `--Syringoceras Hyatt 1894 K64
              |            |--*S. granulosostriatum (Klipstein 1843) [=Ammonites granulosostriatus] K64
              |            `--S. credneri K64
              `--Grypoceratidae [Domatoceratidae, Grypoceratinae, Gryponautilidae] K64
                   |--Gryponautilus Mojsisovics 1902 K64
                   |    `--*G. galeatus (Mojsisovics 1873) [=Nautilus galeatus] K64
                   |--Menuthionautilus Collignon 1933 K64
                   |    `--*M. kieslingeri (Collignon 1933) [=Nautilus (*Menuthionautilus) kieslingeri] K64
                   |--Paradomatoceras Delépine 1937 K64
                   |    `--*P. applanatum Delépine 1937 K64
                   |--Parastenopoceras Ruzhentsev & Shimanskiy 1954 K64
                   |    `--*P. khvorovae Ruzhentsev & Shimanskiy 1954 K64
                   |--Plummeroceras Kummel 1953 K64
                   |    `--*P. plummeri (Kummel 1953) [=Grypoceras (*Plummeroceras) plummeri] K64
                   |--Pselioceras Hyatt 1884 K64
                   |    `--*P. ophioneum (Waagen 1879) [=Nautilus ophioneus] K64
                   |--Titanoceras Hyatt 1884 K64
                   |    `--*T. ponderosum (Meek 1872) [=Nautilus ponderosus] K64
                   |--Virgaloceras Schindewolf 1954 K64
                   |    `--*V. noduliferum (Reed 1944) [=Gastrioceras noduliferum] K64
                   |--Stearoceras Hyatt 1893 (see below for synonymy) K64
                   |    |--*S. gibbosum (Hyatt 1891) [=Endolobus gibbosus] K64
                   |    |--S. hesperium Miller & Youngquist 1949 P68
                   |    `--S. simplex K64
                   |--Domatoceras Hyatt 1891 (see below for synonymy) K64
                   |    |--*D. umbilicatum Hyatt 1891 K64
                   |    |--D. kleihegei K64
                   |    |--D. northropi Miller & Unklesbay 1942 P68
                   |    `--D. moorei K64
                   |--Grypoceras Hyatt 1883 K64
                   |    |--*G. mesodicum (Quenstedt 1845) [=Nautilus mesodicus] K64
                   |    |--G. brahmanicum K64
                   |    |--G. hexagonalis K64
                   |    |--G. milleri K64
                   |    `--G. obtusum K64
                   |--Stenopoceras Hyatt 1893 K64
                   |    |--*S. dumblei (Hyatt 1891) [=Phacoceras dumblei] K64
                   |    |--S. abundum K64
                   |    |--S. cooperi K64
                   |    |--S. inexpectans Miller 1945 P68
                   |    |--S. smithi K64
                   |    `--S. whitei Miller & Youngquist 1949 P68
                   `--Epidomatoceras Turner 1954 H99
                        |--*E. planotergatum (M’Coy 1844) (see below for synonymy) H99
                        |--E. aemelum Shimansky 1967 H99
                        |--E. cricki (Foord 1891) H99
                        |--E. doohylense (Foord 1900) [=Coelonautilus doohylensis, Pseudometacoceras doohylensis] H99
                        |--E. flemingi Turner 1965 H99
                        |--E. gradus (Foord 1891) [=Coelonautilus gradus, Stroboceras gradus] H99
                        |--E. maccoyi Turner 1954 H99
                        |--E. neilsoni Turner 1965 H99
                        |--E. subsulcatum (Phillips 1836) H99
                        `--E. vivum Shimansky 1967 H99

Domatoceras Hyatt 1891 [incl. Penascoceras Ruzhentsev & Shimanskiy 1954, Permodomatoceras Ruzhentsev & Shimanskiy 1954, Pseudometacoceras Miller, Dunbar & Condra 1933, Stenodomatoceras Ruzhentsev & Shimanskiy 1954] K64

*Epidomatoceras planotergatum (M’Coy 1844) [=Nautilus (Discites) planotergatus, Coelonautilus planotergatus, Domatoceras planotergatus, Epidomatoceras planotergatus, Pseudometacoceras planotergatus] H99

Stearoceras Hyatt 1893 [incl. Neodomatoceras Ruzhentsev & Shimanskiy 1954, Parapenascoceras Ruzhentsev & Shimanskiy 1954] K64

* Type species of generic name indicated

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[H99] Histon, K. 1999. A revision of A. H. Foord’s monograph of Irish Carboniferous nautiloid cephalopods (1897-1901). Part 2. Monograph of the Palaeontographical Society 153: 63-129.

[K64] Kummel, B. 1964. Nautiloidea – Nautilida. In Treatise on Invertebrate Paleontology pt. K. Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea (R. C. Moore, ed.) pp. K383-K457. The Geological Society of America and the University of Kansas Press.

[P68] Purnell, L. R. 1968. Catalog of the Type Specimens of Invertebrate Fossils. Part I: Paleozoic Cephalopoda. United States National Museum Bulletin 262: 1-198.

Teichert, C. 1988. Main features of cephalopod evolution. In The Mollusca vol. 12. Paleontology and Neontology of Cephalopods (M. R. Clarke & E. R. Trueman, eds.) Academic Press.

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