
Never let it be said I won't willingly go to great lengths to keep my readers happy. Case in point, a few weeks ago, Christopher Taylor--Kiwi, "working taxonomist," aficionado of well-groomed facial hair, and author of the blog
Catalog of Organisms--commented on
one of my That's a Moray Monday posts where I put forward that I don’t like to feature images of preserved (or pickled) specimens (such as the one pictured at the top of this post) from museum collections. To which Christopher responded:
Despite your prejudices, can I put in a request for a post about pickled specimens in jars of formalin? It might be interesting to see a "we don't know as much about morays as we think we do" post. Even as a working taxonomist, it always amazes me to consider just how many organisms - from trees to toads to ticks to tapeworms - we know from specimens floating in jars and absolutely f***-all else.
Ask and you shall receive, Christopher. Mind you, it took a wee bit of time to pose your question and a few others to an arbitrary (though distinguished) cadre of museum colleagues:
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Karsten Hartel, Curatorial Associate and Manager of Ichthyology Collections for the Museum of Comparative Zoology, Harvard University;
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David Smith, eel specialist with the Division of Fishes, Smithsonian Institution; and,
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Dave Catania, Senior Collection Manager, Ichthyology, at the California Academy of Sciences.
My sincere appreciation at the start to all of these busy scientists for taking time from their daily workload to answer my questions. Mr. Catania was happy to provide some feedback, but referred me to the Academy's legendary John McCosker, as he has published extensively on the systematics of Muraenids. Unfortunately, Dr. McCosker was out of town for July and I wanted to get a post in before too long. What I'm most happy to report is that every one of the museum scientists I contacted replied to my rather unusual query within just a few days. In addition to providing great info, they affirmed warm feelings of science camaraderie while also validating that others share my general geekery about all things moray.
Holy Holotype, BatmanI asked Karsten Hartel if the MCZ has one of the more extensive collections of moray holotype specimens (the actual specimen of an organism that's used when the species was formally described.) He explained that in total, the MCZ's moray collection is not that large (material applied to about 35 names). He noted however that the Smithsonian, by comparison, has 102 type specimens. This was confirmed by the Smithsonian's David Smith who said that the august DC institution probably does indeed have the largest collection of morays in the world (in fact, the Smithsonian has the largest collection of preserved fishes in the world). Cal. Academy's Dave Catania reported back that the Academy has 15 Muraenid holotypes. He suspects that the Academy of Natural Sciences in Philadelphia has somewhat more moray holotype specimens.
A Question of NumbersAs far as how many species have been identified, things get a little fuzzy. Karsten noted that if you go to the
California Academy of Sciences database (it lists all of the known names ever applied to fishes) and search on Muraenidae (the fish family that includes morays) you will get 533 species names that have been applied to the family at one time or another. However, he explains that we now know that there are almost 200 valid species (Nelson's Fishes of the World says 185) and that is largely because ichthyologists were able to examine the actual specimens used to describe each taxon.
The Smithsonian's eel specialist, David Smith, says no one is really sure precisely how many species of morays there are worldwide. The figure of 200, he said, is almost certainly too low, "We are continually finding new species of morays," reports Smith. "Some species are very widely distributed, while others inhabit only small, restricted areas. One species is known only from Walters Shoals, a submerged reef south of Madagascar. Another is restricted to the Red Sea, and another to the Indian Ocean off South Africa. With the advent of DNA testing, we are sure to find even more species."
Today's Special: Pickled MorayGetting right to Christopher's primary question of what we know about morays solely from pickled museum specimens, the answer appears to be "quite a lot." The Smithsonian's David Smith responded, "Actually, much of what we know about morays comes from these preserved collections. We can gain information on where each species lives geographically, the ecological habitat, and the variation in characters both within an area and between one place and another." Smith goes on to explain that these preserved specimens also provide information on comparative anatomy, and this in turn can enable us to determine evolutionary relationships.
So with all these one-of-a-kind moray specimens filling up shelf space in museum collections, they must get picked apart and probed a lot, right? "Nope," says MCZ's Karsten Hartel. "Primary type specimens are almost never dissected in order to keep them intact as possible for future generation of scientists," he said. "The non-type parts of the MCZ collections offer a wider opportunity to study all aspects of eel biology from molecular to biodiversity. But by using x-rays or scans, some internal anatomy can be obtained. This, Karsten notes, is very important in eels where the number of vertebrae is incredibly important to understand what is a species and what is not.
Classify Now? Classify Later?I was curious (as a non working taxonomist) as to the process from collection of specimens in the field to ultimate identification and storage in museum collections. Is this a speedy process or, like a lot of scientific enterprises, does lack of capacity mean that some collected and potentially novel species can sit for quite some time before undergoing classification. In other words, is it possible that our museum collections have new moray species just waiting to be taxonomically defined. David Smith with the Smithsonian was first to weigh-in, "I not only suspect, but I know for a certainty, that many new species of moray eels currently reside in museum collections, some right here at the Smithsonian. With more DNA sampling, those numbers are bound to increase," he said. Harvard's Collection Manager, Hartel, agreed, "I'm sure there are new species out there but I'm not an eel specialist."
I asked if one could quantify an "average time" (if there is indeed such a thing) it might take to ascribe taxonomic description and identity to a collected moray specimen. Do most specimens that are collected by museums sit in bottles on shelves for quite some time before a researcher gets around to writing a monograph or some such taxonomic description? Karsten responded that it's, "Almost impossible to average. He described that the turnaround time depends on current knowledge of the group. "If its a poorly known group that has not been looked at in years, it might require a full review of the group by borrowing material from around the world, visiting museums around the world," he explained. "This can literally take years!"
"On the other hand," he coninued, "if a new very distinctive species is found, then things could move very fast especially with new electronic journals like
Zootaxa as was witnessed for the moray species
Gymnothorax baranesi. That specimen sat on the shelf since 2002, but once the study was finished and the paper accepted in Nov. 2007 it was published by January 2008."
Smithsonian's David Smith concurred, "There really is no average time between the discovery of a new species and its published description. It depends on the situation." Smith explains, "A scientist may find the new species in the field and describe it shortly after returning to his (her) home base, if he is working on that particular group. Or it may be collected as part of an expedition and sit on a shelf until someone comes along and finds it, recognizes it, and publishes on it. It also depends on how much time a scientist has, how many other tasks compete for his time, etc. It is probably more common for a specimen to sit on a shelf for a while than to be published immediately. There are a lot more specimens in museums than there are scientists to study them. Some groups have no one studying them."
So the message here is clear: We need more moray taxonomists! Hear that, Christopher? For the good of the scientific enterprise, you need to start considering a way to disseminate those taxonomically inclined genes of yours. Take one for the team and get those genes in circulation! Either that or we all need to step up the message that taxonomy and classification is an
exciting and living branch of the natural sciences and
NOT the dry "stamp collecting" for which it often gets the unfair rap.
The Science Behind The Specimens A final query I put to my museum contacts was to describe some of the current or recent scientific research in which museum moray specimens have proven vital. Karsten Hartel was first to respond that, "During my tenure, MCZ material (and other museums) has been very important for scientists who have studied eels. One example is the two volume (adults and leptocephali) work on the
eels of the western North Atlantic or the Fishes of the Atlantic Ocean regional series." He also provided
a link to the volume that describes species from the Western Central Pacific.
Both Karsten and Cal Academy's Dave Catania both pointed out that museum specimens are proving crucial in compiling online, searchable databases for fish species. Karsten mentioned that, "information on the holdings of major museums are being assemble into searchable databases (see the
Global Biodiversity Information Facility) which is becoming more and more important for understanding diversity, especially in difficult to identify species where access to museum specimens is a necessity." Catania mentioned that
FishBase is another searchable site that is assisting scientists in better understanding fish diversity and biogeography.
Dave Smith with the Smithsonian reminds us that while we have compiled new understandings of morays, a lot of scientific work remains to be done. To this point, he adds, "Very little is known about the anatomy and the biology of morays. Only a couple of species have ever had their osteology (structure of the bones and skeleton) described, and we know very little about their ecology, behavior, and reproduction, except in the most general sense. So, there is much more to learn about morays."
So there you have it, Christopher. Seems we have mapped just the tip of the iceberg in so far as understanding moray species. It's exciting to think that there’s still plenty of work and understanding yet to accomplish. Which to me at least is incredibly encouraging to think that future generations of marine biologists, taxonomists, and museum curatorial personnel can take-up the challenge.