CORAL BONUS: Geographic Variants Within Clownfishes – Saddleback & Skunk Complexes – (Part 6c)
24 Dec, 2014
Genetics | Hybrids | Species Part 1| 2 | 3 | 4 | 5 | 6a | 6b | 6c | 6d | 6e | 7 | 8 | Index
Geographic Variants Within the 30 Current Species of Clownfishes – The Saddleback and Skunk Complexes
Considering the prior observations of Anemonefish enthusiasts, and surveying the observed geographic variants of Anemonefishes by Matt Pedersen
Amphiprion latezonatus – Kylie Waldon suggested that there was a color difference between Latezonatus found on the mainland vs. those at Lord Howe Island. Looking at her illustrations, it actually appears that she simply did not understand the differences between juvenile and adult coloration in the species.
Amphiprion polymnus – there are at least three distinct forms of Saddleback Clownfish in the trade, and it should be noted that host-induced melanism is well documented in this species.
#1. The classic brown form, with a true white saddle, is the type I grew up with and is well documented from the Philippines, and probably occurs in other locations as well.
#2. A second black form, often erroneously imported as “Black Percula” from certain exporters, also comes from the Philippines. Some suppliers suggest this form is specifically found in Cebu. Barros documents this form also occurring in Lembeh Straits, Indonesia and further digging revealed documentation in Bali and Sulawesi. This Black form has a complete and narrower white midstripe vs. a wide saddle-shaped mark. The Black Saddleback Clownfish also has a white caudal peduncle stripe and bright yellow pectoral fins in juveniles. Breeding with this form has proven it to breed true, strongly suggesting this is a genetically-based variation of the species and not host-driven melanism.
#3. A third form, that with a black body and yellow chest and again the classic saddle-shaped midstripe, is found in Papua New Guinea. It is quite possible that this form might also be found in the Solomon Islands, although that is speculation only at this time. This form is currently one of the most desirable forms, but also one of the most infrequently seen.
#4. Here Yuri Barros and I may disagree; Barros believes that the form of A. polymnus found in Thailand represents a unique subpopulation of A. polymnus. To me, these simply look like melanistic individuals of the first, brown group. Still, it does seem that only dark-colored individuals show up in Thai diving photos; brown forms do not seem to be present. Whether this is host-driven melanism or a distinct genetic population (or both) is up for debate.
Amphiprion sebae – when seen side by side with A. clarkii, there is no confusing these two species, yet the misidentifications continue to this day. The true A. sebae is found in the Indian Ocean, with populations reaching eastward into Bali where it can even be seen side by side with it’s relative A. polymnus, and even the erroneously-called “Sebae” representatives of A. clarkii.
The true Sebae Anemonefish appears to be a pretty uniform species with no geographic variants that I can personally recognize and pin down. There is mild variation within the coloration of this species – some individuals may show black centers on the caudal fin, particularly as juveniles. Typically A. sebae exhibits yellow lower fins (see examples #1, #2, #3), although in some specimens the yellow on the lower portions of the body and caudal peduncle may be replaced with black, purported to be a host-induced melanism (such as this specimen in Java).
The Skunk Complex
Amphiprion akallopisos – With occurrences spread throughout the Indian Ocean, including far flung locales like the Seychelles and the Comoros off Africa’s east coast, it is surprising that there are no known geographic variations of A. akallopisos at this time. It is almost impossible, however, to visually differentiate this species from the look-alike Amphiprion pacificus.
Amphiprion leucokranos – this “species” (hybrid) can show “variation” but this isn’t geographic in nature. Instead, I believe the variation is due to the genetic reshuffling that occurs due to its hybrid origin. Its known range of occurrence is limited to where the parental species, A. sandaracinos and the Black-footed forms of A. chrysopterus, reside; basically the Solomon Islands and the New Guinae land mass (PNG and Indonesian Papua). Gainsford has documented a full range of phenotypes with fish leaning towards A. chrysopterus but many more leaning towards the A. sandaracinos parent (see this example of A. x leucokranos and A. sandaracinos cohabitating in Papua, Indonesia). With wild-sourced Whitebonnets, one should expect some variation between individuals (see also Part II of this series), and variation is well documented now within the captive-bred offspring of these fish (see examples from ORA). A recent report of this “species” occurring in Java proved inaccurate; the fish were simply collected in Papua, and then brought to Java for exportation.
Amphiprion nigripes – the Blackfooted, Black Foot, Rose, or Rose Skunk Clownfish does show some variation in coloration, but these variations are not suspected geographic in nature since the fish hails from the Maldives. References also suggest occurrences in Sri Lanka and other islands off the coast of India, but currently I can find no photographic evidence to support that.
Amphiprion pacificus – there are no known variations within this species at this time, and given a presumably small geographic range (Fiji, Tonga, Samoa, Wallis Island) no biogeographical variation would be expected.
Amphiprion perideraion – the Pink Skunk Clown does show some variation in coloration; whether these variations are tied to geography is a matter requiring further investigation.
It does appear that specimens of A. perideraion with more orange-based coloration are found in Fiji and Vanuatu; these are commonly referred to as “Sunkist” and apparently these variations do breed true to form. There has been suggestions that both more typical “pink” and the more desirable “orange” forms are both found in Fiji (and I’ve received both forms sold to me as originating from Vanuatu). While nothing has been firmly established, at this time, suggestions of habitat location may be linked to color forms. This suggestion also causes me to speculate; could different habitats offer different hosts, and then, could the coloration be in any way tied to host anemone species? The nature of coloration and possible variation in of A. perideraion coloration is an area open for further investigation.
In addition to the Sunkist type color variants, a “magenta” form has been shown off by a retailer at one time; I openly speculated as to whether the fish had been dyed (a practice common with some freshwater fish) although a wild photo from the Coral Sea shows a very magenta individual living side by side with more normally colored forms. Could there be genetic mutations behind the various “shades” of A. perideriaon? It’s certainly worth investigation.
It has been noted that some forms of Pink Skunks have orange bars on the top and bottom of the caudal fin; this has at times been suggested as a trait of a male, but I cannot confirm nor deny that statement.
Amphiprion sandaracinos – I am not aware of any geographic variations within this species at this time; for that matter I’m unaware of any variations within the Orange Skunk Clownfish. Individuals from the Solomon Islands or New Guinea region may show aberrant patterning, but this is likely due to the ongoing hybridization of this species with A. chrysopterus. Presumably such aberrant individuals are specimens with low-level remnants of mixed DNA from past hybridization and subsequent back crossing to the A. sandaracinos parent.
Amphiprion thiellei – since so few specimens have been found in the first place, it is difficult to say whether there would be any geographic variation. Barros documents wild photos from three recurring locations; Cebu Island and Balicasag/Bohol Island in the Philippines, but also reports an occurrence from Menjangan Island to the northwest of Bali Island in Indonesia. Barros also points to a couple online images showing A. theillei residing with A. ocellaris; an interesting observation given the suspected ocellaris parentage proposed by some (being A. ocellaris X A. sandaracinos). Given the very small geographic footprint, combined with the highly suspected hybrid origin, most likely the variations we may see in patterning or coloration are due to the suspected hybrid nature of the species.
Continue to the next segment; Geographic Variants of Clownfishes in the Tomato Species Complex
Genetics | Hybrids | Species Part 1| 2 | 3 | 4 | 5 | 6a | 6b | 6c | 6d | 6e | 7 | 8 | Index
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