Hexatrygonidae, a new family of stingrays (Myliobatiformes: Batoidea) from South Africa, with comments on the classification of Batoid fishes
- Heemstra, Phillip C, Smith, Margaret Mary
- Authors: Heemstra, Phillip C , Smith, Margaret Mary
- Date: 1980
- Subjects: Hexatrygonidae , Hexatrygon bickelli , Stingrays -- South Africa -- Classification , Rajiformes -- South Africa -- Classification
- Language: English
- Type: Text
- Identifier: vital:14996 , http://hdl.handle.net/10962/d1019701 , ISBN 0-86810-038-2 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 43
- Description: A new species of stingray, Hexatrygon bickelli Heemstra and Smith, is described from a specimen washed up on a beach at Port Elizabeth on the south coast of South Africa. This new species differs from all other batoid fishes in having six gill arches and a peculiar hypertrophied snout that appears to be a well-developed electroreceptive organ, and in the configuration of its spiracles. Other characters that separate H. bickelli from previously known rays (myliobatiforms) are its small simple brain (other rays have a very large complex brain) and the absence of supraorbital crests on the cranium. In addition, all myliobatiforms are neritic (with none having been recorded below 200 m), and H. bickelli is.presumed to live in moderately deep water (400 to 1000 m). The classification of batoid fishes is reviewed, and Hexatrygon is placed in a new family and suborder of the Myliobatiformes. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1980
- Authors: Heemstra, Phillip C , Smith, Margaret Mary
- Date: 1980
- Subjects: Hexatrygonidae , Hexatrygon bickelli , Stingrays -- South Africa -- Classification , Rajiformes -- South Africa -- Classification
- Language: English
- Type: Text
- Identifier: vital:14996 , http://hdl.handle.net/10962/d1019701 , ISBN 0-86810-038-2 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 43
- Description: A new species of stingray, Hexatrygon bickelli Heemstra and Smith, is described from a specimen washed up on a beach at Port Elizabeth on the south coast of South Africa. This new species differs from all other batoid fishes in having six gill arches and a peculiar hypertrophied snout that appears to be a well-developed electroreceptive organ, and in the configuration of its spiracles. Other characters that separate H. bickelli from previously known rays (myliobatiforms) are its small simple brain (other rays have a very large complex brain) and the absence of supraorbital crests on the cranium. In addition, all myliobatiforms are neritic (with none having been recorded below 200 m), and H. bickelli is.presumed to live in moderately deep water (400 to 1000 m). The classification of batoid fishes is reviewed, and Hexatrygon is placed in a new family and suborder of the Myliobatiformes. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1980
A review of the squirrelfishes of the subfamily Holocentrinae from the Western Indian Ocean and Red Sea
- Randall, John E, 1924-, Heemstra, Phillip C
- Authors: Randall, John E, 1924- , Heemstra, Phillip C
- Date: 1985
- Subjects: Squirrelfishes -- Indian Ocean , Squirrelfishes -- Red Sea
- Language: English
- Type: Text
- Identifier: vital:15019 , http://hdl.handle.net/10962/d1019798 , ISBN 0-86810-116-8 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 49
- Description: Two genera of Squirrelfishes of the subfamily Holocentrinae are found in the Indo-Pacific region: Neoniphon (Flammeo of recent authors) and Sargocentron (Adioryx of most recent authors). A total of 19 species of these two genera occur in the Indian Ocean west of the southern tip of India: Neoniphon argenteus, N. aurolineatus (Flammeo scythrops Jordan & Evermann and Holocentrus anjouanae Fourmanoir are junior synonyms), N. opercularis, N. aurolineatus, Sargocentron caudimaculatum, S. diadema, S. ittodai (first records for the Red Sea and western Indian Ocean), S. macrosquamis (recently described from the Red Sea and Amirante Group, Seychelles, the range here extended to Kenya, Mozambique, Mauritius, and the Chagos Archipelago), S. melanospilos (usually misidentified as cornutum which is known only from the Indo-Malayan region), S. microstoma (known in the region only from Maldive Islands and Astove Island), S. praslin (usually not distinguished by authors from S. rubrum; Holocentrum marginatum Cuvier is a synonym), S. punctatissimum (has priority over lacteoguttatum due to selection by first revisor, Bleeker, 1873), S. rubrum, S. seychellense (an insular western Indian Ocean species), S. spiniferum (Holocentrum melanotopte- rus Bleeker is a junior synonym), S. tiere (Holocentrum elongatum Steindachner is a junior synonym), S. tiereoides (a new western Indian Ocean record), S. violaceum, and a new species, S. inaequalis (closely allied to macrosquamis Go- lani, 1984, differing in variable Spination of preopercle, modally one fewer pectoral ray, fewer average number of lateral-line scales and a more elongate body). S. inaequalis is described from a total of 7 specimens from the Chagos Archipelago, Seychelles and Comoro Islands. S. melanospilos is recorded for the first time from the Red Sea where it appears to be subspecifically distinct from populations elsewhere in the Indo-Pacific region (no subspecific name proposed). Holocentrum macropus Gunther, allegedly collected at Mauritius, is a misidentification of the Atlantic Holocentrus ascensionis (Osbeck). A lectotype is selected for S. microstoma. Neotypes are designated for S. praslin and S. rubrum. Colour photographs of fresh specimens of all of the species except S. macrosquamis are presented. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1985
- Authors: Randall, John E, 1924- , Heemstra, Phillip C
- Date: 1985
- Subjects: Squirrelfishes -- Indian Ocean , Squirrelfishes -- Red Sea
- Language: English
- Type: Text
- Identifier: vital:15019 , http://hdl.handle.net/10962/d1019798 , ISBN 0-86810-116-8 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 49
- Description: Two genera of Squirrelfishes of the subfamily Holocentrinae are found in the Indo-Pacific region: Neoniphon (Flammeo of recent authors) and Sargocentron (Adioryx of most recent authors). A total of 19 species of these two genera occur in the Indian Ocean west of the southern tip of India: Neoniphon argenteus, N. aurolineatus (Flammeo scythrops Jordan & Evermann and Holocentrus anjouanae Fourmanoir are junior synonyms), N. opercularis, N. aurolineatus, Sargocentron caudimaculatum, S. diadema, S. ittodai (first records for the Red Sea and western Indian Ocean), S. macrosquamis (recently described from the Red Sea and Amirante Group, Seychelles, the range here extended to Kenya, Mozambique, Mauritius, and the Chagos Archipelago), S. melanospilos (usually misidentified as cornutum which is known only from the Indo-Malayan region), S. microstoma (known in the region only from Maldive Islands and Astove Island), S. praslin (usually not distinguished by authors from S. rubrum; Holocentrum marginatum Cuvier is a synonym), S. punctatissimum (has priority over lacteoguttatum due to selection by first revisor, Bleeker, 1873), S. rubrum, S. seychellense (an insular western Indian Ocean species), S. spiniferum (Holocentrum melanotopte- rus Bleeker is a junior synonym), S. tiere (Holocentrum elongatum Steindachner is a junior synonym), S. tiereoides (a new western Indian Ocean record), S. violaceum, and a new species, S. inaequalis (closely allied to macrosquamis Go- lani, 1984, differing in variable Spination of preopercle, modally one fewer pectoral ray, fewer average number of lateral-line scales and a more elongate body). S. inaequalis is described from a total of 7 specimens from the Chagos Archipelago, Seychelles and Comoro Islands. S. melanospilos is recorded for the first time from the Red Sea where it appears to be subspecifically distinct from populations elsewhere in the Indo-Pacific region (no subspecific name proposed). Holocentrum macropus Gunther, allegedly collected at Mauritius, is a misidentification of the Atlantic Holocentrus ascensionis (Osbeck). A lectotype is selected for S. microstoma. Neotypes are designated for S. praslin and S. rubrum. Colour photographs of fresh specimens of all of the species except S. macrosquamis are presented. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1985
- «
- ‹
- 1
- ›
- »