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Model Of A Cephalaspis, an Early Devonian European Fish Stock Photo
RMC1R4H0–Model Of A Cephalaspis, an Early Devonian European Fish
Ancient fossil of jawless fish Cephalaspis in sand Stock Photo
RF2WMTYDH–Ancient fossil of jawless fish Cephalaspis in sand
Ateleaspis tesselata, white background. Stock Photo
RF2A14FYX–Ateleaspis tesselata, white background.
Old Nineteenth century illustration. Cephalaspis, an extinct genus of agnate fish of the class Osteostraci, were protected by armor. They were detritivore fish from the Devonian period in Western Europe. Old 19th century engraved illustration from El Mundo Ilustrado 1879 Stock Photo
RM2EA6CJF–Old Nineteenth century illustration. Cephalaspis, an extinct genus of agnate fish of the class Osteostraci, were protected by armor. They were detritivore fish from the Devonian period in Western Europe. Old 19th century engraved illustration from El Mundo Ilustrado 1879
Three kinds of armored fish from the Devonian Period, including Coccosteus (1), Pterichthys (2) and Cephalaspis (3). Illustration from Louis Figuier's The World Before the Deluge, 1867 American edition. Stock Photo
RMG14W9B–Three kinds of armored fish from the Devonian Period, including Coccosteus (1), Pterichthys (2) and Cephalaspis (3). Illustration from Louis Figuier's The World Before the Deluge, 1867 American edition.
Fossil of Cephalaspis lyelli ('Head Shield') A Species of Palaeozoic Armoured Jawless Fish Stock Photo
RMCMNXP9–Fossil of Cephalaspis lyelli ('Head Shield') A Species of Palaeozoic Armoured Jawless Fish
Catalogue of the fossil fishes in the British Museum (Natural History) .. . m and proportions of the anterior shield havealready been determined by Lankester (fig. 25), and the fossils underdiscussion are quite similar to those previously studied. The absenceof posteriorly prolonged cornua is distinctly shown; there is thewell-defined high posterior ridge behind the postorbital valley,*and the usual three layers entering into the constitution of the shielare readily distinguishable. There is also no trace of sensorycanals. 186 OSTEOSTRACI. The superficial ornamentation is not very satisfactori Stock Photo
RM2AJJWJ6–Catalogue of the fossil fishes in the British Museum (Natural History) .. . m and proportions of the anterior shield havealready been determined by Lankester (fig. 25), and the fossils underdiscussion are quite similar to those previously studied. The absenceof posteriorly prolonged cornua is distinctly shown; there is thewell-defined high posterior ridge behind the postorbital valley,*and the usual three layers entering into the constitution of the shielare readily distinguishable. There is also no trace of sensorycanals. 186 OSTEOSTRACI. The superficial ornamentation is not very satisfactori
Fish with large round mouth. Stock Photo
RMFJYRKR–Fish with large round mouth.
. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 56 IOWA GEOLOGICAL SURVEY. Fig. 3. Fig. 3. Ateleaspis tesselata Tract. Silurian (Downtonian) of Scotland, restored outline showing tail in profile, x k (after Traquair). Diagrammatic by complete skeletons in which the dermal covering consists merely of small shagreen tubercles, sometimes beautifully orna- mented, or of minute hollow spines. Another interesting form of great systematic importance is Ateleaspis (Fig. 3), which is regarded by Dr. Traquair as annectant between Heterostraci and the next higher order, Osteostraci Stock Photo
RMPF9KET–. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 56 IOWA GEOLOGICAL SURVEY. Fig. 3. Fig. 3. Ateleaspis tesselata Tract. Silurian (Downtonian) of Scotland, restored outline showing tail in profile, x k (after Traquair). Diagrammatic by complete skeletons in which the dermal covering consists merely of small shagreen tubercles, sometimes beautifully orna- mented, or of minute hollow spines. Another interesting form of great systematic importance is Ateleaspis (Fig. 3), which is regarded by Dr. Traquair as annectant between Heterostraci and the next higher order, Osteostraci
. Systematische Übersicht der erloschenen und der lebenden Familien der Wirbeltiere. (Die erloschenen Familien und Gattungen sind durch einen * bezeichnet. Von jeder Familie ist nur je eine Gattung als Beispiel genannt, auch wenn diese Familie eine größere Zahl von Gattungen umfaßt.) I. Klasse: Rundmäuler (Cyclostomata). Myxinidae: Myxine. Petromyzodontidae : Petromyzon. II. Klasse: Fische (Pisces). I. Unterklasse: Anaspida. *Lasanüdae: *Lasanius. *Birkeniidae: *Birkenia. *PteroIepidae: *Pterolepis. II. Unterklasse: Osteostraci. *Coelolepidae: *TheIodus. *Cephalaspidae: *Cephalaspis. "Tre Stock Photo
RMMCNPTN–. Systematische Übersicht der erloschenen und der lebenden Familien der Wirbeltiere. (Die erloschenen Familien und Gattungen sind durch einen * bezeichnet. Von jeder Familie ist nur je eine Gattung als Beispiel genannt, auch wenn diese Familie eine größere Zahl von Gattungen umfaßt.) I. Klasse: Rundmäuler (Cyclostomata). Myxinidae: Myxine. Petromyzodontidae : Petromyzon. II. Klasse: Fische (Pisces). I. Unterklasse: Anaspida. *Lasanüdae: *Lasanius. *Birkeniidae: *Birkenia. *PteroIepidae: *Pterolepis. II. Unterklasse: Osteostraci. *Coelolepidae: *TheIodus. *Cephalaspidae: *Cephalaspis. "Tre
Ateleaspis tesselata swimming on the sandy bottom. Stock Photo
RF2A14FYM–Ateleaspis tesselata swimming on the sandy bottom.
Armored Fishes, Illustration Stock Photo
RMHRJR3A–Armored Fishes, Illustration
Hemicyclaspis is an ostracoderm from the Early Devonian of England. Stock Photo
RFHG64XG–Hemicyclaspis is an ostracoderm from the Early Devonian of England.
. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. nct). The Aspidocephalt (also called Osteostraci)have bone-corpuscles in the shields, and theshield of the back is of one piece, withoutlateral line-channels or sense-organs. The orderincludes four families, Atcleaspidce (extinct),Ccphalaspidce (extinct), Thyestidce (extinct), Class Arthrodires.— Another group of ex-tinct mailed fishes is known as Arthrodira(ipOpov, joint; Sup-f), neck). In this groupjaws are developed, but of peculiar chara Stock Photo
RM2AG13CW–. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. nct). The Aspidocephalt (also called Osteostraci)have bone-corpuscles in the shields, and theshield of the back is of one piece, withoutlateral line-channels or sense-organs. The orderincludes four families, Atcleaspidce (extinct),Ccphalaspidce (extinct), Thyestidce (extinct), Class Arthrodires.— Another group of ex-tinct mailed fishes is known as Arthrodira(ipOpov, joint; Sup-f), neck). In this groupjaws are developed, but of peculiar chara
Cephalaspis, Illustration Stock Photo
RF2BEH5AA–Cephalaspis, Illustration
Cephalaspis lyelli jawless fish from the Early Devonian of Scotland Stock Photo
RFHG64X5–Cephalaspis lyelli jawless fish from the Early Devonian of Scotland
Catalogue of the fossil fishes in the British Museum (Natural History) .. . Similar specimen, with rostrum relatively shorter and moreacutely pointed. Purchased, 1888. P. 5971. Fragment with rostrum. Purchased, 1889. P. 5480. Imperfect impression of inner aspect of shield, with theinferior rim. Purchased, 1888. P. 5971 a. Fragment showing part of the hinder border of theshield. Purchased, 1889. P. 5974. Fragmentary squamation, probably of this species. Thescales are ornamented with very fine tubercles often fusedin series. Purchased, 1889. 192 OSTEOSTRACI. Cephalaspis dawsoni, Lankester. 1S70. Stock Photo
RM2AJJW9T–Catalogue of the fossil fishes in the British Museum (Natural History) .. . Similar specimen, with rostrum relatively shorter and moreacutely pointed. Purchased, 1888. P. 5971. Fragment with rostrum. Purchased, 1889. P. 5480. Imperfect impression of inner aspect of shield, with theinferior rim. Purchased, 1888. P. 5971 a. Fragment showing part of the hinder border of theshield. Purchased, 1889. P. 5974. Fragmentary squamation, probably of this species. Thescales are ornamented with very fine tubercles often fusedin series. Purchased, 1889. 192 OSTEOSTRACI. Cephalaspis dawsoni, Lankester. 1S70.
Cephalaspis, Illustration Stock Photo
RF2BEH5AN–Cephalaspis, Illustration
. The Cambridge natural history. Zoology. 528 FISHES hinder part invested by a rhombic squamation, the Osteostraci are distinguished by the presence of bone as a histological component of the dermal hard parts ; by the position of the orbits, which, instead of being marginal in position, are close together on the dorsal aspect of the carapace; and by the possession of a median dorsal fin. Fam. 1. Ateleaspidae.^—The general shape of the body is much the same as in the Coelolepidae, but the exoskeleton con- sists of numerous polygonal tuberculated plates in front of the postero-lateral lobes, an Stock Photo
RMRDKF66–. The Cambridge natural history. Zoology. 528 FISHES hinder part invested by a rhombic squamation, the Osteostraci are distinguished by the presence of bone as a histological component of the dermal hard parts ; by the position of the orbits, which, instead of being marginal in position, are close together on the dorsal aspect of the carapace; and by the possession of a median dorsal fin. Fam. 1. Ateleaspidae.^—The general shape of the body is much the same as in the Coelolepidae, but the exoskeleton con- sists of numerous polygonal tuberculated plates in front of the postero-lateral lobes, an
Cephalaspis, Illustration Stock Photo
RF2BEH5AE–Cephalaspis, Illustration
. The Cambridge natural history. Zoology. OSTRACODERMI OSTEOSTRACI 529 numerous primitively distinct polygonal plates (Fig. 319, A). Between the orbits there is a separately calcified but fixed plate, which bears a hollow prominence, probably for the reception of a parietal organ. In some genera certain of the anterior dorsal and ventral scales of the trunk fuse into a continuous plate. Internally to the postero-lateral cornua the middle layer of the shield is prolonged backwards into a pair of singular flap- like lobes, which have been variously interpreted as corresponding to the lateral lob Stock Photo
RMRDKF5Y–. The Cambridge natural history. Zoology. OSTRACODERMI OSTEOSTRACI 529 numerous primitively distinct polygonal plates (Fig. 319, A). Between the orbits there is a separately calcified but fixed plate, which bears a hollow prominence, probably for the reception of a parietal organ. In some genera certain of the anterior dorsal and ventral scales of the trunk fuse into a continuous plate. Internally to the postero-lateral cornua the middle layer of the shield is prolonged backwards into a pair of singular flap- like lobes, which have been variously interpreted as corresponding to the lateral lob
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 340 Mr. C. T. Re^an on the Placodermi. Tlie close relationship of the Coccosteidie and Asterolepidai jiad been generally recognized until they were so widely and unnecessarily separated by Cope, a proceeding which has found more support than it deserved^ and I have no hesitation in uniting the groups of which these families are represen- tative, together with the Osteostraci, in a single order of leleostomi. It has b:'en stated that the bones of the skull of the Coccosteidaj c Stock Photo
RMRMMJ09–. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 340 Mr. C. T. Re^an on the Placodermi. Tlie close relationship of the Coccosteidie and Asterolepidai jiad been generally recognized until they were so widely and unnecessarily separated by Cope, a proceeding which has found more support than it deserved^ and I have no hesitation in uniting the groups of which these families are represen- tative, together with the Osteostraci, in a single order of leleostomi. It has b:'en stated that the bones of the skull of the Coccosteidaj c
. Chordate morphology. Morphology (Animals); Chordata. the bone. In Drepanaspis these canals are represented partly by grooves and partly by canals. In most Osteostraci, ex- cept Tremataspis and closely related genera, the reticular canals are indicated by interareal grooves, and the sensory lines by short canal segments as well as grooves. The pattern of sensory lines as seen in Tremataspis can be taken as representative of this group. The supraorbital line is reduced to a small segment behind the eye. The infraor- bital canal is separated by a gap from the main or ventral lateral lines. Ther Stock Photo
RMRJ71J8–. Chordate morphology. Morphology (Animals); Chordata. the bone. In Drepanaspis these canals are represented partly by grooves and partly by canals. In most Osteostraci, ex- cept Tremataspis and closely related genera, the reticular canals are indicated by interareal grooves, and the sensory lines by short canal segments as well as grooves. The pattern of sensory lines as seen in Tremataspis can be taken as representative of this group. The supraorbital line is reduced to a small segment behind the eye. The infraor- bital canal is separated by a gap from the main or ventral lateral lines. Ther
. Annual report. New York State Museum; Science; Science. DEVONIC FISHES OF THE NEW YORK FORMATIONS 3 I Orders ANASF»IDA and OSXEOSXRACI Neither of these orders is represented in the fossiliferous horizons of New York State. A single species belonging to Euphanerops longaevus Woodward is known from the Upper Devonic of Scaumenac bay, Quebec, and the Osteostraci are represented by four species of Cepha- laspis [text fig. 5], two from the Lower and two from the Upper Devonic of British America,. It has been claimed by Professor William Patten that the genus Cephalaspis is provided with a "f Stock Photo
RMRMAHCX–. Annual report. New York State Museum; Science; Science. DEVONIC FISHES OF THE NEW YORK FORMATIONS 3 I Orders ANASF»IDA and OSXEOSXRACI Neither of these orders is represented in the fossiliferous horizons of New York State. A single species belonging to Euphanerops longaevus Woodward is known from the Upper Devonic of Scaumenac bay, Quebec, and the Osteostraci are represented by four species of Cepha- laspis [text fig. 5], two from the Lower and two from the Upper Devonic of British America,. It has been claimed by Professor William Patten that the genus Cephalaspis is provided with a "f
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. GNA THOSTOMES. 225 ORDER II. ASPIDOCEPHALI (OSTEOSTRACI). Head covered by a large, simple, arcuate shield much like the cephalothorax of Limtdus in outline, with ' orbits ' near its centre. Tail covered with rhomboid scales of varying size. No paired appendages known. Cephalaspis, Devonian. Auchenaspis, upper Silurian. ORDER III. ANTIARCHA. Head and trunk covered with large polygo- nal plates coated with enamel; tail with small scales, ' orbits' dorsal, close together, a single pair of appendages ('pectoral fins'), covered w Stock Photo
RMRDT09M–. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. GNA THOSTOMES. 225 ORDER II. ASPIDOCEPHALI (OSTEOSTRACI). Head covered by a large, simple, arcuate shield much like the cephalothorax of Limtdus in outline, with ' orbits ' near its centre. Tail covered with rhomboid scales of varying size. No paired appendages known. Cephalaspis, Devonian. Auchenaspis, upper Silurian. ORDER III. ANTIARCHA. Head and trunk covered with large polygo- nal plates coated with enamel; tail with small scales, ' orbits' dorsal, close together, a single pair of appendages ('pectoral fins'), covered w
. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. ADAPTATION DES OSTRACODERMES VIE BENTHIQUE DÃPRESSIFORME EUPHOTHIQUE. Vertébrés craniotes. Poissons agnathostomes.. FIG. I. " Cephalaspis Lyelli, L. Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â CephalaspidÅ. Glammis, Forfarshire (Ecosse). â Vue dorsale. â Longueur : o"'20, environ. D'après E. Ray Lankester (Pateontographical Society, 1870, XXIII, Pl. VIII, fig. 0- â monlrcr les Yeux cenlraux fonctionnels, Adaptation à la Vie benlliique déprcsslforme e Stock Photo
RMRGPX85–. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. ADAPTATION DES OSTRACODERMES VIE BENTHIQUE DÃPRESSIFORME EUPHOTHIQUE. Vertébrés craniotes. Poissons agnathostomes.. FIG. I. " Cephalaspis Lyelli, L. Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â CephalaspidÅ. Glammis, Forfarshire (Ecosse). â Vue dorsale. â Longueur : o"'20, environ. D'après E. Ray Lankester (Pateontographical Society, 1870, XXIII, Pl. VIII, fig. 0- â monlrcr les Yeux cenlraux fonctionnels, Adaptation à la Vie benlliique déprcsslforme e
. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. FiG. Cephalaspis Lyelli, L, Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â Cephalaspida;. Arbroath, Forfarshire (Ecosse). â Profil gauche. â Longueur : o"20, environ. D'après E. Ray Lanliester (Pateontographical Society, 1870, XXIII, Pl. XI, fig. i). Pour montrer la Queue dans le prolongement direct de l'axe longitudinal du corps, ou Gépliyrocorque Mtérocerque Adaptation à la "Vie benlliique. Ateleaspis tessellata, R. H. Traquair, ,899. - Silurien supà Stock Photo
RMRGPX7G–. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. FiG. Cephalaspis Lyelli, L, Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â Cephalaspida;. Arbroath, Forfarshire (Ecosse). â Profil gauche. â Longueur : o"20, environ. D'après E. Ray Lanliester (Pateontographical Society, 1870, XXIII, Pl. XI, fig. i). Pour montrer la Queue dans le prolongement direct de l'axe longitudinal du corps, ou Gépliyrocorque Mtérocerque Adaptation à la "Vie benlliique. Ateleaspis tessellata, R. H. Traquair, ,899. - Silurien supÃ
. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. FIG. I. " Cephalaspis Lyelli, L. Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â CephalaspidÅ. Glammis, Forfarshire (Ecosse). â Vue dorsale. â Longueur : o"'20, environ. D'après E. Ray Lankester (Pateontographical Society, 1870, XXIII, Pl. VIII, fig. 0- â monlrcr les Yeux cenlraux fonctionnels, Adaptation à la Vie benlliique déprcsslforme euphotlque.. FiG. Cephalaspis Lyelli, L, Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â Cephala Stock Photo
RMRGPX7T–. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. FIG. I. " Cephalaspis Lyelli, L. Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â CephalaspidÅ. Glammis, Forfarshire (Ecosse). â Vue dorsale. â Longueur : o"'20, environ. D'après E. Ray Lankester (Pateontographical Society, 1870, XXIII, Pl. VIII, fig. 0- â monlrcr les Yeux cenlraux fonctionnels, Adaptation à la Vie benlliique déprcsslforme euphotlque.. FiG. Cephalaspis Lyelli, L, Agassiz, i835. â Dévonien inférieur. Ostracodermes. â Osteostraci. â Cephala
. Die stämme der wirbeltiere. Evolution; Paleontology; Vertebrates. Systematische Übersicht der erloschenen und der lebenden Familien der Wirbeltiere. (Die erloschenen Familien und Gattungen sind durch einen * bezeichnet. Von jeder Familie ist nur je eine Gattung als Beispiel genannt, auch wenn diese Familie eine größere Zahl von Gattungen umfaßt.) I. Klasse: Rundmäuler (Cyclostomata). Myxinidae: Myxine. Petromyzodontidae : Petromyzon. II. Klasse: Fische (Pisces). I. Unterklasse: Anaspida. *Lasanüdae: *Lasanius. *Birkeniidae: *Birkenia. *PteroIepidae: *Pterolepis. II. Unterklasse: Osteostraci. Stock Photo
RMRCFPAJ–. Die stämme der wirbeltiere. Evolution; Paleontology; Vertebrates. Systematische Übersicht der erloschenen und der lebenden Familien der Wirbeltiere. (Die erloschenen Familien und Gattungen sind durch einen * bezeichnet. Von jeder Familie ist nur je eine Gattung als Beispiel genannt, auch wenn diese Familie eine größere Zahl von Gattungen umfaßt.) I. Klasse: Rundmäuler (Cyclostomata). Myxinidae: Myxine. Petromyzodontidae : Petromyzon. II. Klasse: Fische (Pisces). I. Unterklasse: Anaspida. *Lasanüdae: *Lasanius. *Birkeniidae: *Birkenia. *PteroIepidae: *Pterolepis. II. Unterklasse: Osteostraci.
. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 56 IOWA GEOLOGICAL SURVEY. Fig. 3. Fig. 3. Ateleaspis tesselata Tract. Silurian (Downtonian) of Scotland, restored outline showing tail in profile, x k (after Traquair). Diagrammatic by complete skeletons in which the dermal covering consists merely of small shagreen tubercles, sometimes beautifully orna- mented, or of minute hollow spines. Another interesting form of great systematic importance is Ateleaspis (Fig. 3), which is regarded by Dr. Traquair as annectant between Heterostraci and the next higher order, Osteostraci Stock Photo
RMRCTB5E–. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 56 IOWA GEOLOGICAL SURVEY. Fig. 3. Fig. 3. Ateleaspis tesselata Tract. Silurian (Downtonian) of Scotland, restored outline showing tail in profile, x k (after Traquair). Diagrammatic by complete skeletons in which the dermal covering consists merely of small shagreen tubercles, sometimes beautifully orna- mented, or of minute hollow spines. Another interesting form of great systematic importance is Ateleaspis (Fig. 3), which is regarded by Dr. Traquair as annectant between Heterostraci and the next higher order, Osteostraci
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