Contribution to the Taxonomy and Distribution of Six Shark Species (Chondrichthyes, Elasmobranchii) from the Gulf of Thailand

Abstract

A collection of nine shark specimens from six different species, obtained in 1993 from the Gulf of Thailand, was examined in this study. The sharks were determined, morphometrically and meristically analyzed, photographically documented, and compared with relevant literature. Additionally, further available material from the fish collections of the Zoological Museum Hamburg, the Senckenberg Naturmuseum Frankfurt, and the Muséum national d'Histoire naturelle, Paris, was examined by way of comparison. Contrary to most references, prominent dorsal ridges were detected in several specimens of Chiloscyllium griseum. Additionally, one of the specimens had a very unusual big ocellar blotch on the head which had not been reported for this genus before. For Paragaleus randalli, it could be proven that the teeth morphologically deviate strongly from those shown in literature due to having much larger cusps. Furthermore, the known distribution area of Paragaleus randalli could be extended considerably eastwards by about 2000 km. For a seventh species, Paragaleus tengi, differences between the actual morphology of upper lateral teeth and those drawn in the original description were detected.

Catch composition and aspects of the biology of sharks caught by Thai commercial fisheries in the Andaman Sea

“…These two species dominated the landings by number (46·3 and 18·8% respectively) and also contributed greatly to the total biomass of the landings (15·7 and 11·3% respectively). White () noted that C. hasseltii is very similar morphologically to the grey bamboo shark Chiloscyllium griseum Müller & Henle 1838, which is also considered to occur in Thai waters (Weigmann, ; Ebert et al, ). Thus, it should be considered that the C. hasseltii individuals recorded in this study may have contained some individuals of C. griseum .…”

Annotated checklist of the living sharks, batoids and chimaeras (Chondrichthyes) of the world, with a focus on biogeographical diversity

“…Annandale 1909 is a junior synonym of H. undulata ; westernmost confirmed record in the Indian Ocean off western Malaysia (Weigmann, 2011). Also reported off India (from the Gulf of Mannar)…”

Length-weight relationships of four sharks caught in the Northern Persian Gulf and Oman Sea

“…In the present study a new maximum total length (TL) was identified for C. dussumieri (114 cm TL); in previous studies from other parts of the world the maximum TL was reported as 101 cm by Cortés (), 75 cm by Weigmann (), and 100.7 cm by White (). For C. macloti the TL from the present samples was less than that reported in earlier studies (Assadi & Dehghani, ; Last & Stevens, ).…”

“…In the present study a new maximum total length (TL) was identified for C. dussumieri (114 cm TL); in previous studies from other parts of the world the maximum TL was reported as 101 cm by Cortés (2000), 75 cm by Weigmann (2012), and 100.7 cm by White (2012).…”