Acanthodian,onychodontid and osteolepidid fish from the middle-upper Taemas Limestone (Early Devonian), Lake Burrinjuck,New South Wales

A meagre ischnacanthid acanthodian fauna, known from fragmentary dentigerous jawbones from Lake Burrinjuck, Yass district, New South Wales, consists of three taxa: Taemasacanthus narrengullenensis, Taemasacanthus cooradigbeensis and an indeterminate ischnacanthid. The fossils are from three Early Devonian (Emsian) units at Taemas: the Bloomfield Limestone Member, the Currajong Limestone Member and the Warroo Limestone Member, which constitute the middle-upper parts of the Taemas Limestone (Murrumbidgee Group); and from Unit 6 of the ‘Upper Reef formation’ at Wee Jasper. Whereas ischnacanthid acanthodian remains are increasingly rarer in the higher levels of the Taemas Limestone, remains of onychodontid and osteolepidid fishes are relatively abundant; Onychodus yassensis sp. nov., Onychodus sp. and isolated osteolepidid teeth are locally common.     

Lower Devonian ischnacanthid fish (Gnathostomata: Acanthodii) from the Taemas Limestone,Lake Burrinjuck,New South Wales

Dentigerous jawbones of ischnacanthid acanthodians from the Lower Devonian Currajong Limestone Member and the lower part of the Bloomfield Limestone Member of the Taemas Limestone (Murrumbidgee Group: early Emsian) in the Murrumbidgee valley at Good Hope, Taemas district, and the Goodradigbee valley at Wee Jasper are described. Three taxa of Taemasacanthus are recognized: T. sp. cf. erroli Long, 1986; T. narrengullenensis sp. nov. and T. cooradigbeensis sp. nov. Fragmentary fin spine remains and scales are also described.     

Acanthodian fish remains from the Lower Devonian Cavan Bluff Limestone (Murrumbidgee Group), Taemas district,New South Wales

A well-preserved acanthodian fish fauna from the Lower Devonian (early Emsian) Cavan Bluff Limestone (Murrumbidgee Group), Taemas, Yass district, New South Wales, consists of dentigerous jawbones, fin spines and scales. Four taxa belonging to the Order Ischnacanthida are recognized including Taemasacanthus erroli Long, 1986 and newly described genera and species Cavanacanthus warrooensis gen. et sp. nov., Cambaracanthus goodhopensis gen. et sp. nov. and Taemasacanthus porca sp. nov. An amended diagnosis is provided for T. erroli. The jawbone of C. warrooensis gen. et sp. nov. is of moderate size and bears a single row of teeth with a circular parabasal section. The jawbone extends in an anterior direction beyond the foremost tooth. C. goodhopensis gen. et sp. nov. is a small to moderate sized jawbone bearing two teeth rows separated by a longitudinal ridge. The teeth of the mesial tooth row, the main tooth row, are circular in parabasal section. The lateral tooth row is weakly developed, bearing one or two incipient teeth. T. porca sp. nov. is represented by a small curved jawbone (mesially concave) bearing two teeth rows separated by a prominent longitudinal ridge. The teeth of both tooth rows have a circular parabasal section. The anterior extension of this ridge beyond the foremost tooth represents approximately one quarter the length of the jawbone. These fishes inhabited a Lower Devonian carbonate platform consisting of patch reefs built upon a muddy substrate on a low energy shallow marine shelf which was subjected to frequent storm surges.     

Book reviews

Ian McLean, White Aborigines. Identity Politics in Australian Art, Cambridge: Cambridge University Press, 1998. x + 204 pp., 9 b. & w. illus. ISBN 0–521–58416–7. £40.00.

Ákos Moravánszky, Competing Visions. Aesthetic Invention and Social Imagination in Central European Architecture, 1867–1918, Cambridge, Mass. & London: MIT Press, 1998. xvi + 508 pp., 32 col. and 312 b. & w. illus. ISBN 0–262–13334–2. £29.95.

Andrew Piersenné, Explaining Our World, London and New York: E. & F. N. Spon, 1999. xii + 252 pp., 50 b. & w. illus. ISBN 0–419–21940–4. £45–00.

Simone Abram, Jacqueline Waldren and Donald V. L. Macleod (eds.), Tourists and Tourism: Identifying with People and Places, Oxford and New York: Berg, 1997. xii + 245 pp., 4 figs. ISBN 1–85973–905–9. £14.99.

Martin Cooper (ed.), Laser Cleaning in Conservation: An Introduction, Oxford: Butterworth‐Heinemann, 1998. xii + 98 pp, 43 col. and 11 b. & w. illus. ISBN 0–7506–3117–1. £40.00.

Jon Lang, Madhavi Desai and Miki Desai, Architecture and Independence. The Search for Identity—India 1880 to 1980, Delhi: Oxford University Press, 1997. xxii + 347 pp., c. 750 b. & w. illus. and figs. ISBN 0–19–563900–6. £20.00.     

Illegal fishing and Australian security

The security impact of illegal fishing is not well understood. Where illegal fishing is recognised as a security problem, the focus has been on fish as a natural resource, the depletion of which can have impacts on food security, individual livelihoods, and the economic survival of states relying on illegal fishing. We argue that a focus on fish as a natural resource obscures the other security challenges the crime of illegal fishing poses to Australia. As this paper explains, illegal fishing overlaps with drug, human, weapon and other contraband trafficking and smuggling; irregular maritime arrivals; and maritime piracy. In addition, like other easily transported, high value resources, illegal fish can fund insurgencies and other types of political violence. Understanding illegal fishing as a security challenge will improve Australia’s national security policy. First, it acknowledges fish as a vital natural resource, implicated in economic, ecological, and human security; second, it analyses how illegal fishing interlinks with other maritime crimes; third, it challenges the effectiveness of monitoring and enforcement of illegal fishing; fourth, it presents an opportunity for effective regional cooperation; and finally it highlights the benefits of regional cooperation in responding to illegal fishing.     

New data on the structure of the Early Devonian lungfish,Dipnorhynchus

A skull of a young specimen of Dipnorhynchus sussmilchi (Etheridge Jr), from the base of the Bloomfield Limestone Member (mid-Emsian, probably perbonus Zone) at Taemas, has both sides of the skull roof preserved, but the cheeks are missing. The posterior end of the endocranium, up to its dorsal extremity, provides new data on the endolymphatic sacs, and the attachment of the epaxial muscles. The endolymphatic region is compared with that of Chirodipterus australis. The palate is not fully formed and the marginal ridges are not fully developed. The fine structures around the dermopalatines and the pterygoids are preserved, indicating the manner in which the plates grew. The position of the parasphenoid is clearly outlined against the pterygoids, and confirms the view that this primitive genus of dipnoans did not have the pterygoids divided by the parasphenoid. All these features provide new information and comparison with Dipterus valenciennesi, the next oldest genus on which the same regions are preserved. In addition, a new mandible from a horizon low in the Cavan Bluff Formation is well preserved and provides information on the external bones of Dipnorhynchus.