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Pailsus rossignolii sp. nov.

Holotype: An adult specimen (no. 364) of 105 cm total length lodged at Museum Zoologicum Bogoriense, Balai Penelitian dan Pengembangan Zoologi Puslitbang Biologi LIPI, Jl. Raya Bogor Jakarta Km 46, Cibinong 16911, Indonesia.Pailsus rossignolii sp. nov. from Merauke, Irian Jaya.

The animal has 54 single subcaudal scales. The locality of collection is given as "New Guinea", but to date the species is only known from the south of the Island in the general region of Merauke Lat 8 30' Long 140 20' and areas a short distance west of here along the coast.

Diagnosis: For many years this species has apparently been misidentified and confused with the King Brown Snake (Cannia australis) and possibly snakes of the genus Pseudonaja. It is not known if the species is sympatric with either. All species are relatively large, nondescript in appearance and smooth-scaled species of brownish dorsal coloration. There are few if any prominent markings.

The species seems to be most like Pailsus pailsei, from which it can be separated definitively by the following:-

    1. Distribution This species is known only from the island of New Guinea, Pailsus pailsei is known only from Australia and possibly Groote Eylandt, immediately adjacent to the Northern Territory Coast (refer to Hoser 1999b, for details on the Groote Eylandt and West Australian reports).
    2. The two species can be separated by DNA analysis.
    3. The subcaudal count for P. rossignolii observed is substantially less than for P. pailsei, (under 60 in P. rossignolii (see later this paper) versus 69 in the only two definitively known P. pailsei) but until a greater number of specimens are checked, the differences observed so far may not remain consistent. We have an unconfirmed report of a third Australian Pailsus from near Wyndham, WA having 75 single subcaudals (Richard West, pers. comm), further indicating that Australian and New Guinea specimens can be separated by their subcaudal counts, (49-58 for New Guinea animals known versus 69-75 for Australian animals known).

It is also likely that P. rossignolii sp. nov. and P. pailsei can be separated by colouration. Specimens of P. rossignolii seen appear to be slightly darker in colouration. However the samples of both species inspected to date are small and later examinations of further specimens may find these traits as being unreliable indicators for separating the species.

Pailsus rossignolii (and P. pailsei) are separated from Cannia australis by the following characters:

    1. A more slender and gracile build, particularly around the head and neck, which is nowhere near as broad.
    2. A smaller adult size,
    3. A smaller less broad and/or distinct head.
    4. The body mass differences between the genera are substantial. To date Cannia is known to regularly exceed 2.5 metres, more than double the length known for Pailsus. Noting the more thick-set nature of Cannia, this would translate as a mass difference between the genera of a vast magnitude.
    5. Pailsus rossignolii (and P. pailsei) can be reliably be separated from Cannia australis from northern Australia and north-western Queensland (where both genera occur) by the lack of paired subcaudals (under 10) when compared with local Cannia australis (over 10). If C. australis do in fact occur on the island of New Guinea, then one would expect specimens to have similar subcaudal patterns in terms of paired versus single. (Refer to Hoser (1998) for a comparison between Australian Pailsus and Australian Cannia subcaudal scale counts).

References in the literature to some Cannia australis having no paired subcaudals (e.g. Cogger 1992, Wilson and Knowles 1988) may in fact be erroneously referring to snakes of the genus Pailsus and this possibility should be investigated.

Worrell (1972) and Hoser (1989) do not give Cannia australis as ever having all single subcaudals. Further investigation of all specimens in Australia lodged in Museums currently classified as Cannia australis is required to help clarify taxonomy of C. australis, Pailsus rossignolii, Pailsus pailsei and similar species. To conduct such a survey was beyond the means of this author with regards to time constraints and other commitments.

Pailsus rossignolii can be separated from Pseudonaja by the following:

    1. A typical lack of paired subcaudals versus all or mainly divided in Pseudonaja,
    2. The lack of orange or brown ventral markings,
    3. It's whitish coloured rostral.

Suggestions made that Pailsus rossignolii or any other Pailsus species may be a "hybrid" between Cannia australis and a Pseudonaja must be dismissed on the following grounds:

    1. There is no evidence of any such hybridisation occurring.
    2. All hybrid Australasian snakes seen by this author, including Acanthophis hawkei X A. lancasteri, Morelia spilota X Morelia amethistina and Morelia spilota X Liasis fuscus have always had scalation intermediate between the parents. This is not the case for Pailsus rossignolii. From the data presented in this paper and Hoser (1998), it is evident that it is in fact Cannia australis (definitely not a hybrid snake) that appears to have what could be termed scalation intermediate between Pseudonaja and Pailsus, at least with reference to the number of paired or single subcaudals.
    3. Pailsus and Cannia are sympatric in the Mount Isa Area of Queensland demonstrating that they are specifically distinct and do not cross-breed in the wild state.

Habitat of type locality: New Guinea has diverse habitats. However the species is only known from drier habitats such as Savannah woodlands, like that around the Merauke area in Irian Jaya, which to date is where most specimens of this species have been collected.

Merauke is known for it's concentration of "Australian-type" herpetofauna not found elsewhere in New Guinea, or with restricted distribution on the Island.

Further information of relevance to this description and discussion: A search of live and preserved collections in Europe and Asia revealed a number of specimens of this species that had been incorrectly identified as King Brown Snakes ("Cannia australis"). These included animals held by Wolfgang Schneyer from Mannheim and Henning Schulz from Berlin, Bend Weizel in Germany, and Julio Mara in Italy (refer to Mara (2000), Weitzel (2000a, 2000b, 2000c), Yuwono (2000)). Duplicitous e-mails from the previous and/or other people are not cited at the end of this paper.

The same search revealed no specimens that this author was able to identify as King Brown Snakes (Cannia australis) and/or identifiable as the species described by Gray in 1842 from Port Essington in the Northern Territory identifiable as coming from New Guinea.

The specimens in captivity in Europe had in the main been shipped by dealer Leo Jaya from Jakarta. All had been labelled as "King Brown Snakes", and all ranged from .8 to 1.1 metre in total adult length. None came anywhere near the two metres or more attributed to adult C. australis from northern Australia (Yuwono 2000, personal communication).

All specimens of P. rossignollii had all subcaudals single (range being 49-58) (N=3, exact no.s 49, 54, 58). The snakes are believed to have been sourced from Merauke, Irian Jaya, where they are understood to be reasonably common.

It is likely that there are no King Brown Snakes (C. australis) in New Guinea and all records for this species on that island should be treated as doubtful, pending further investigations. Also see the comments on this below.

Worrell (1972) refers to a doubtful record for C. australis from Dutch New Guinea. That may in fact be for P. rossignolii sp. nov. The material in O'Shea (1996) dealing with King Brown Snakes clearly relies at least in part, on information based on Australian specimens. On that basis its relevance to the new species described herein is ignored.

Some of the taxonomic arrangements proposed by Wells and Wellington (1983, 1985a and 1985b) have been shunned by many herpetologists for a variety of reasons.

However their arrangements in terms of adopting the genus name Cannia has merit and should be used by herpetologists, as opposed to the use of Pseudechis for "King Brown Snakes" as seen in publications such as Cogger (1983, 1992), Greer (1997), Longmore (1986), Shea, Shine and Covacevich (1993), Wilson and Knowles (1998).

Following publication of a description of Pailsus pailsei by this author in 1998, a number of e-mails were received from David Williams and Mark O'Shea stating that they were (as a pair) also looking at "King Brown Snakes" from New Guinea. Williams noted that included in his samples were snakes attributable to the new species or so he thought.

Sometime after this Williams and Starkey (1999) published an extensive online paper where they alleged that Pailsus pailsei was not a valid species and went on to allege the species described by Hoser (1998) was in fact just an aberrant C. australis. There were other related posts and publications, including Williams (1998a, 1998b, 1999a, 1999b) as well as Fry (1998a, 1998b, 1998c, 1998d). An undertaking by Williams to publish further material in a "peer reviewed journal" did not appear to materialize.

Hoser (1999a) published a response to the Williams and Starkey paper re-affirming why Pailsus is distinct from C. australis. The position outlined in that paper appears to have been generally accepted by Australian herpetologists.

In the absence of further relevant papers from Starkey, Williams or O'Shea on New Guinea "King Brown" snakes within a reasonable time frame, this description has been published in order that the hitherto undescribed form (described above) is validly named.

Potential Misinformation and confusion: For last quarter of the 20th century, export of reptiles from Australia has been illegal. Many snakes sent out of the country illegally were labelled as being from "New Guinea" or "Dutch New Guinea" so that the recipients could claim to have received the snakes legally. Among the animals labelled as such may have been King Brown Snakes (Cannia australis) from Australia. Such snakes may still exist in European or American collections.

(By way of example in 1993 this author saw "New Guinea" Collett's Snakes (Paracedechis colletti) for sale in the USA labelled as coming from New Guinea. Those snakes are in fact an Australian endemic).

This author doubts that any "genuine" C. australis in collections outside of Australia are in fact sourced from New Guinea. In the absence of any such specimens from New Guinea it is recommended that the species (C. australis) be formally removed from lists of fauna from the Island and remain so unless and until specimens are found and properly identified along with accurate locality data.

Captivity: As for the genus. Refer to Hoser (1998). Specimens have been kept alive in Europe for some years. A detailed account of their husbandry is beyond the scope of this paper.

However some specimens do display considerable agitation and aggression as illustrated in the following account of a captive male by Bernd Weitzel

This thing just doesn't stay on a hook, bites in every direction and even tries to bite you when walking past the cage. It then bites into the glass, the mouth trying to get a hold of something and that's for minutes.

Such behavior is extremely unusual for Cannia, which are usually of more even disposition. When photographing an old P. pailsei in Australia, the snake also tried to bite the hook, indicating that highly-strung behavior may be typical for the genus.

Conservation and Research: To date there is no information available as to what these snakes feed on in the wild. This causes problems in terms of assessing potential conservation risks for the species.

There are also believed to be more live snakes of this species in captivity than dead specimens in museums, although neither are in sizeable numbers or even numbers enough for meaningful research. To rectify the situation, this author has called on holders of these snakes to lodge the bodies in public museums at time of death. P. pailsei lays eggs and it is assumed that P. rossignolii does likewise. None have been bred in captivity to the knowledge of this author.

P. rossignolii is not believed to be threatened in the wild, however in view of risks posed by feral pests such as Cane Toads (Bufo marinus) as well as other unseen threats in the form of diseases, which may or may not be introduced by humans, this author calls for self-sustaining captive populations to be set-up in politically stable areas, such as Western Europe and North America, so as to insure against possible calamity in the wild.

Etymology: The snake described above is named after Fred Rossignoli of Ringwood, Victoria, as tribute to his work involving Australian reptiles, in particular through his educational lectures at schools and other educational institutions.

Common Name: The newly described snake is herein called "Pailsus" in recognition of the comments made by Sutherland (1999) and for want of alternatives.

Straun Sutherland wrote in the Medical Journal of Australia that he would prefer the name "King Brown" not be used in connection with Cannia australis or P. pailsei due to the fact that their venoms have closer affinities to those of the black snakes (Pseudechis) and are not neutralised by Psedonaja (Brown snake) anti-venoms.

Sutherland then stated he preferred the alternative name for "King Brown" snakes, namely "Mulga Snake" as this would remove potential confusion between these snakes and Pseudonaja. The proposal may have merit within Australia and could be adopted for Australian Cannia. However it is a fact that most Australian's identify Cannia as "King Brown" rather than "Mulga" snakes.

Snakes of the genus Pailsus are now known to occur in both Australia and New Guinea, where the name "Mulga" is meaningless and where at the present time, there is serious doubt that any Cannia do in fact occur on the island. Therefore the name Pailsus is in fact a more appropriate common name to be used for these snakes both within Australia and New Guinea, bearing in mind that there is as yet, no established common name.

Based on Sutherland's published comments, which I regard as valid, I now prefer to use the name "Pailsus" as a common name to describe snakes of this relatively newly identified genus rather than my originally proposed "False King Brown Snake".



Originally published in Litteratura Serpentium Volume 20, Number 6, pp. 178-186, in December 2000.
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