Added 13 March 2004.
If you read any books or literature on reptiles, amphibians or invertebrates, sooner or later you're going to come up against words that you may only have heard in biology at school, if at all. Words like rostral, mental (nothing to do with the brain or the intelligence), distal, caudal and scute abound, particularly when telling you how to identify one species from another.
This isn't some devious plan by writers or herpetologists to preserve some sort of "in-crowd" or make themselves feel above you. Rather it is a shorthand way of passing on information. Every area of human knowledge has its own special words, and herpetology is no exception. These words are actually fairly easily understood once you've picked up the meaning. Note that some of them can be used as both nouns (eg, "The Fire Salamander is a caudate") and adjectives (eg, "the caudate circulatory system").
This list is by no means complete yet, but will be updated on a regular basis. It is not intended to be exhaustive but to help the reader understand some of the terms more commonly used on these pages, particularly species guides.
saurian |
lizard |
chelonian |
an animal that is a tortoise, turtle or terrapin; adjective relating to such an animal |
anuran |
frog or toad |
caudate |
newt or salamander |
urodele |
newt or salamander |
ophid |
snake or serpent |
crocodilian |
relating to alligator, crocodile, caiman or gharial |
diurnal |
active by day |
crepuscular |
active by twilight |
nocturnal |
active by night |
arboreal |
pertaining to trees: hence an arboreal species is a tree-dwelling species |
terrestrial |
ground-dwelling |
fossorial |
burrowing or living below ground |
riparian |
living by streams or rivers |
saxicolous |
dwelling among rocks |
aestivate |
to reduce bodily activity during period of hot and/or dry/arid weather, usually in a place offering some protection from excessive heat or dryness; similar to, but not as intense as, hibernation (noun = aestivation) |
hibernate |
to drastically reduce bodily activity during prolonged cold weather (usually winter), usually by entering a period of dormancy in a shelter (noun = hibernation) |
anterior |
frontal, at the front |
posterior |
rear, at the rear |
dorsal |
top, on top: in a four-legged creature such as a lizard, salamander or cat, it refers to the creature's back, as opposed to its underbelly |
ventral |
bottom, underneath: the opposite of dorsal. Thus, a lizard's ventral surfaces are the undersides of its limbs, its throat and its belly. |
caudal |
tail, or pertaining to the tail |
cranial |
head, or pertaining to the head |
distal |
the part of something furthest from its point of attachment: thus the distal part of a toe is the opposite end to where it joins the foot |
gular |
throat, pertaining to the throat |
anal |
relating to the anus |
osteoderm |
in crocodiles and some lizards, a bony plate directly attached below the skin to a scale above - a sort of armour plating |
orbital |
eye socket |
cloaca |
in amphibians, reptiles and birds, the anal opening that serves for both excreting and reproduction. Beavers also have a cloaca rather than the mammalian arrangement of a separate anus and reproductive opening. |
axilla |
armpit |
collar |
in some lizards, for instance, lacertids, a sort of fringe of scales between the head and neck |
xiphisternal rods/xiphisterna |
paired longitudinal structures extending posteriorly from the main body of the sternum; crucial components of the abdominal skeleton, supporting the pectoral girdle and aiding in respiration |
rostral |
single scale on the end of the upper jaw |
postnasals |
one scale on either side of the upper jaw behind the rostral |
supralabial |
scale on the upper jaw above the lip and touching it |
infralabial |
scale on the lower jaw below the lip and touching it |
opercular |
scale over the ear |
tubercle |
a sort of raised and pointed scale: in lizards, usually found only on geckos |
mental |
1. pertaining to thought or mind, eg mental processes: 2. pertaining to the chin, eg mental scale, mental gland (the latter in salamanders): 3. a scale on the chin (usually when related to lizards or snakes) |
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