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Unpaired bone of the skull
The internasal is a dermal bone present in some vertebrates. When present, it is situated between the nasal bones, and forms a part of the dermatocranium
Internasal
Scales that surround the nostrils of snakes
In snakes, the internasal scales are those on top of the head between the scales that surround the nostrils. They are usually paired and situated just
Internasal_scales
Two bones in the bridge of the human nose
for a majority of people. The two nasal bones are joined at the midline internasal suture and make up the bridge of the nose. The outer surface is concavo-convex
Nasal_bone
Malformation of the face
location groups: internasal, nasal, nasalmaxillar and maxillar. The maxillar location can be subdivided in median and lateral clefts. Internasal dysplasia Nasal
Craniofacial_cleft
Intersection of the frontal bone and two nasal bones of the human skull
marks the midpoint at the intersection of the frontonasal suture with the internasal suture joining the nasal bones. It is visible on the face as a distinctly
Nasion
Rigid organs of the skeleton of vertebrates
process Mandibular notch Condyloid process Pterygoid fovea Nose Nasal bone Internasal suture Nasal foramina Inferior nasal concha Ethmoidal process Maxillary
Bone
Suture in the human skull
connecting the frontal bone and the two nasal bones. This suture meets the internasal suture at the nasion. It is crucial in the study of cranial development
Frontonasal_suture
Species of reptile endemic to the southeastern US
scale is higher than it is wide and contacts two internasal scales. There are 10–21 scales in the internasal-prefrontal region and 5–11 (usually 7–8) intersupraocular
Eastern diamondback rattlesnake
Eastern_diamondback_rattlesnake
Species of snake
the nostril in the adult. Its rostral scale is visible from above. The internasal scales are much narrowed anteriorly and subtriangular, with the anterior
Checkered_keelback
Species of snake
listed as determinants of each species: (1) Internasals present/absent. For bandy-bandys, the internasal scales are a pair of scales that occur between
Bandy-bandy
Species of reptile
taller than it is wide. In the internasal-prefrontal area there are 4–22 scales that include 2 large, triangular internasal scales that border the rostral
Timber_rattlesnake
Scales covering the skin of snakes
snout connecting the nasals on both sides of the head are scales called internasals. Between the two prenasals is a scale at the tip of the snout called
Snake_scale
Genus of crocodyliform from the Late Cretaceous period
These include the obliteration of all but the posterior portion of the internasal suture; a laterally facing rugose external articular fossa; the positioning
Kaprosuchus
Extinct genus of tetrapodomorphs
an internasal, an oval-shaped bone which lies at the intersection of the paired premaxillae and nasal bones at the top of the snout. Internasals are
Deltaherpeton
Family of venomous snakes
scales are much reduced in size, their nostrils are located dorsally (no internasal scales), and they give birth to live young (viviparity). The reduction
Elapidae
Fixed joints between bones held together by dense, fibrous tissue
of the bones are flush with each other as in a normal butt joint. Eg: Internasal suture. Limbous sutures – edges are bevelled so the plane of the suture
Fibrous_joint
Bony part of the nose, overlying the nasal bones
two small, oblong nasal bones, which meet at the midline to form the internasal suture. The nasal bridge extends from the nasal root, where the nose meets
Nasal_bridge
Genus of snakes
in contact, and posterior labials horizontally divided, by its divided internasal, upper labials 1–3 contacting the loreal, five lower labials contacting
Dieurostus
Species of snake
4th and 5th lower labial), as well as one preocular in contact with internasals, and three postoculars. Temporals are 2 + 3. The Oriental rat snake Ptyas
Indian_cobra
Extinct order of tetrapods
tetrapods, aside from a few bones in the skull, such as interfrontals, internasals and interparietals, that have developed in some temnospondyl taxa. The
Temnospondyli
Feature of the human face
The nasal bones in the upper part of the nose are joined by the midline internasal suture. They join with the septal cartilage at a junction known as the
Human_nose
Species of fish
madtom is similar to the tadpole madtom (N. gyrinus) except the it has one internasal pore while the tadpole madtom has two, and 16 to 18 anal rays while the
Ouachita_madtom
Species of snake
rostral a little broader than deep, visible from above; suture between the internasals shorter than that between the prefrontals; frontal as long as its distance
Oriental_rat_snake
Permian cartilaginous fish
large hemispherical nasal capsules. The nasal capsules are bridged by an internasal groove. Each capsule roof is shorter than the floor, suggesting that,
Dwykaselachus
Genus of cartilaginous fishes
tooth plate row, and is surrounded by sensory pores and papillae. The internasal flap possesses a deep "V" shaped notch. A single dorsal fin arises near
Aetobatus
Species of snake
The snout is broadly rounded. There is no canthus. A pair of small internasals is present, separated by small scales. The supraoculars are narrow. Other
Lachesis_muta
Species of non-venomous snake
as deep as it is wide, creating a triangular indentation between the internasal scales (rarely separating them). The top of the head is covered with nine
Smooth_snake
Genus of snakes
the genus Synophis have unusual scalation on the top of the head. The internasal scales are very small, and the prefrontal scales are fused into one large
Synophis
Species of snake
distinctive characteristics of this subspecies is that it has three or more internasal scales – something that it has in common with C. viridis. The color pattern
Great_Basin_rattlesnake
Species of snake
The supraoculars are large, 5-9 scales in a line between them. The internasals are usually not in contact with one another, separated by 2 small suprapostrostral
Ovophis_monticola
Set of scales near the tip of the snout of a reptile
frontal, towards the tip of the snout, which are also in contact with the internasals. Snake scales Scale (zoology) Wareham DC (2005). Elsevier's Dictionary
Prefrontal_scales
Species of snake
strongly enlarged, and preceded and followed by a distinct interval; internasal small, 1/2 or less than 1/2 the length of prefrontals; frontal long and
Psammophis_longifrons
but are present in elopomorphs where they are anteriorly fused to the internasal. Intermediate rostrals are similarly absent in many teleosts. The lateral
Rostral_bone
Extinct genus of fishes
the anterior margin while the rest of the bone surface was smooth. The internasal wall of the rostral plate connects the ventral, anterior, and dorsal walls
Asterolepis_(fish)
Species of snake
above more than half its length from the frontal. The suture between the internasals is as long as that between the prefrontals or a little shorter. The frontal
Banded_wolf_snake
Species of snake
(46 cm). Rostral scale nearly twice as broad as deep; suture between the internasals a little shorter than that between the prefrontals; frontal longer than
Sibynophis_subpunctatus
Species of fish
by the internasal distance (21.5–29.3% versus 15.6–23.3% of the head length, respectively). It is distinguishable from H. odoe by the internasal distance
Hepsetus_lineatus
Species of snake
twice as broad as deep, just visible from above; suture between the internasals shorter than that between the prefrontals; frontal longer than its distance
Sibynophis_collaris
Species of snake
characteristic features is the presence of three or more, usually four, internasal scales. Identification characteristics vary depending on which subspecies
Crotalus_viridis
Portion of the cranium that is composed of dermal bone
the facial series make up the snout. Premaxilla/Incisive Maxilla Nasal Internasal Medial rostral Intermediate rostral Lateral rostral (Septomaxilla) Tectals
Dermatocranium
Species of snake
postocular scales. 10–12 supralabial and 12–15 infralabial scales. Two internasal scales, typically in contact with each other. 11–14 cephalic scales. The
Trimeresurus_davidi
Species of snake
pointed with an enlarged rostral scale that extends upward between the internasal scales. Usually, four prefrontal scales are seen. At midbody are 27–37
Pituophis_melanoleucus
Species of snake
bent backwards on the upper surface of the snout; anterior frontals [= internasals] very small; posterior frontals [= prefrontals] longer than broad, much
Lycodon_aulicus
Species of snake from Guatemala
head is mostly blackish with irregular auburn-orange markings on the internasals, prefrontals, frontal, parietals, loreals, postoculars, temporals, and
Rhadinella_xerophila
Genus of snakes
(divided). The ventral count is around 180, and subcaudals around 40. Internasals and prefrontals are subequal in length, which is between 0.7 and 1.0 mm
Azemiops
Species of snake
terminal spine. The head scalation is distinctive in that there is only one internasal scale, no preocular scale, and one anterior temporal scale. The dorsal
Mud_snake
Species of snake
nearly as long as its distance from the frontal. Suture between the internasals half as long as the suture between the prefrontals. Frontal one and two
Atractaspis_leucomelas
Species of snake
distance from the nostril. The rostral scale is broader than deep, and the internasals are much shorter than the prefrontals. The frontal is nearly as long
Boiga_forsteni
Species of snake
rostral is 1.5 to 3.0 times as broad as it is long; the suture between the internasals is nearly as long as that between the prefrontals; the frontal is much
Xenochrophis_cerasogaster
Extinct genus of reptiles
fused nasal bone. The nasal further extends into the nares through an internasal bar. The premaxilla is only slightly longer than wide and followed by
Kosmodraco
Species of snake
The rostral scale is more broad than deep, and is visible from above. Internasal scales are as long as, or slightly shorter than, the prefrontal scales
Dendrelaphis_pictus
Species of snake
pupils, and the nostril is pierced in a single nasal scale, without internasals. Only one prefrontal, in contact with the rostral, is present. No loreal
Cameroon_racer
Species of snake
acutely pointed. The rostral has a lateral cleft. The suture between the internasals is shorter than that between the prefrontals and shorter than the upper
Lytorhynchus_paradoxus
Species of reptile
tan. The rostral is broader than high, barely visible from above. The internasals are slightly longer than broad and are shorter than the anterior prefrontals
Children's_python
Genus of snakes
than keeled. The Costa Rica water snake is characterised by having one internasal scale, one loreal scale that touches the eye, a preocular scale above
Hydromorphus
Genus of snakes
visible from above nearly half as long as its distance from the frontal. Internasals shorter than the prefrontals. Frontal as long as broad, as long as its
Macrelaps
Species of snake
was differentiated from the indigo snake (D. corais) by Rozel in having internasal scales that are longer than the prefrontal scales; the overall colour
Margarita_indigo_snake
Species of lizard
director. Lepidodactylus manni has smooth upper labials, no enlarged internasal scale, and a tail that is round in cross section. Lepidodactylus manni
Lepidodactylus_manni
Species of snake
nine large plates, symmetrically arranged on the crown of the head (two internasals, two prefrontals, one frontal, two supraoculars, two parietals): a character
Agkistrodon_laticinctus
Extinct genus of amphibians
the nasal, a short premaxillary lateral process on the maxilla, and an internasal process on frontals that are both narrow and similar to spines. The origins
Albanerpeton
Subspecies of snake
their mouths.[citation needed] The eastern worm snake has two prefrontal/internasal scales at the front of its head that are separated, unlike the midwestern
Eastern_worm_snake
Genus of snakes
There are usually 1-20 accessory scales (azygous) that separate the internasals and the prefrontals. A subocular ring is present with 8-12 ocular scales
Heterodon
Species of snake
than its distance from the end of the snout). The suture between the internasal scales is often as long as that between the prefrontal scales. Rather
Western_kukri
Species of lizard
keeled, flat, imbricate, and acute. There are 2 postnasal scales, 1–3 internasal scales, and 3 upper labial scales. All of the snout scales are flat and
Saba_least_gecko
Species of snake
rostral is slightly broader than high, barely visible from above. The internasals are shorter than the prefrontals. The frontal is almost twice as broad
Polemon_neuwiedi
Species of snake
large and has vertical pupil; the rostral is broader than deep with the internasal scales shorter than the prefrontal scales. The frontal scales are longer
Boiga_trigonata
Subspecies of snake
larger than the frontal. Prefrontals: Highly broad as well as long. Internasals: Touch the nostrils. Nasals: Divided along a vertical line on which the
Coelognathus helena monticollaris
Coelognathus_helena_monticollaris
Species of reptile
from 50 to 55. There are two postnasals and one to three (usually two) internasal scales. There are two to three (usually three) scales from the upper lip
Virgin_Islands_dwarf_sphaero
Extinct genus of fishes
lyre-shaped trajectory of the supraorbital canal, a fenestra ventralis, small internasal cavities, three coronoids in the lower jaw, an eyestalk and a slender
Styloichthys
Species of snake
Snout longer than eye; rostral broader than deep, visible from above; internasals as long as or shorter than the prae-frontals; frontal as long as or slightly
Boiga_dendrophila
Species of snake
scales on upper surface of head, small, each scale keeled posteriorly; internasals 5–10 times size of adjacent scales, separated by 3–4 scales; supraoculars
Protobothrops_mucrosquamatus
Species of snake
visible from above is as long as its distance from the frontal. The internasals are slightly broader than long, shorter than the prefrontals. The frontal
Micrelaps_boettgeri
Extinct genus of temnospondyls
skull is otherwise of normal Parotosuchus structure, but has a small internasal vacuity between the dorsal processes of the premaxillae. Lateral lines
Subcyclotosaurus
Species of snake
entire. Subcaudals paired and numbering 50-63 in males, 44-54 in females. Internasals large and usually touching. There are 9 or 10 supralabials, the first
Craspedocephalus_malabaricus
Species of snake
tip. Additionally, there are 18–39 heterogeneous small scales in the internasal to prefrontal regions, along with six scales around the eye and seven
Hypnale_zara
Species of snake
rostral by the first upper labial, which forms a suture with the internasal. Internasals slightly longer than broad, slightly longer than the prefrontals
Polemon_gracilis
Species of snake, dwarf sand boa
specimen has: an obtuse tail, and 4-9 scales between its eyes; and "3-4 post-internasal shields... 7-9 scales between [its] eyes... [and] 4-5 scales between nasals
Eryx_miliaris
Species of snake
rather small. Rostral much broader than long, just visible from above; internasals much shorter than the prefrontals; frontal as long as or a little shorter
Lycodon_jara
Subspecies of snake
markings. The rostral scale usually comes into contact with more than 2 internasal scales. Found in northwestern and north-central Arizona along both rims
Crotalus_oreganus_abyssus
Genus of snakes
nostrils are in a divided nasal which does not touch the rostral, the internasal forms a suture with the first upper labial. No loreal is present. The
Polemon_(snake)
Species of snake
rostral visible from above 1⁄2 as long as its distance from the frontal. Internasals shorter than prefrontals. Frontal 1+1⁄3 to 1+1⁄2 as long as broad, as
Aparallactus_modestus
Species of snake
on each temple. Its snout is obtuse. The rostral scale is small, the internasals are very small, and the prefrontals are as long as broad. The frontal
Thickhead_ground_snake
Extinct genus of ophthalmosaurid ichthyosaur
exposed and well preserved, but it is only slightly crushed near the internasal foramen. The nasal is overlain by the prefrontal, with a poorly defined
Thalassodraco
Species of snake
rostral is nearly twice as broad as deep, just visible from above. The internasals are a little broader than long, shorter than the prefrontals. The frontal
Micrelaps_muelleri
Species of snake
smooth, imbricate; supraocular scale narrow, rarely broken up. The internasals are contact or separated by one or two scales. There are 8 to 13 scales
Craspedocephalus_gramineus
Species of cartilaginous fish
whitish underparts, with well-demarkated dark markings around the cloaca, internasal flap and chin. It is found in temperate waters off southern Australia
Grey_skate
Species of snake
distance from the frontal or a little shorter; the suture between the internasals is usually nearly as long as that between the prefrontals. The frontal
Oligodon_arnensis
Species of reptile
eye very large. Head broader than neck. Rostral visible from above; internasals shorter than the prefrontals; frontal as long as its distance from the
Ptyas_korros
Genus of snakes
34-54 pairs. Snout pointed and upturned. Rostral as deep as broad. Two internasals and two prefrontals. Frontal as long as or slightly longer than its distance
Calloselasma
Type of snake scales
also described as being located along the edge of the crown between the internasals and the supraoculars. If these are large scales that contact each other
Canthal_scales
Species of lizard
absence of femoral pores; 8-10 lower labials, 10–13 upper labials, 2 internasal scales; 18-22 subdigital lamellae on its fourth toe of its hindlimb; and
Cyrtodactylus_badenensis
Extinct genus of reptiles
lacrimal bone is straight. The frontals are roughly triangular and have the 'internasal' foramen between them (not between the nasals). They have long posterior
Leninia
Extinct genus of tetrapodomorphs
other bones. The parasphenoid of the fish is both long and wide paired internasal pits resemble early dipnomorphs more than other stem-tetrapods. Towards
Tungsenia
Species of lizard
catbaensis. However, when compared to each other, G.catbaensis lacks internasal scales and the top of its head has a dark marbling pattern compared to
Goniurosaurus_catbaensis
Genus of snakes
nostril is pierced in a single nasal, which does not touch the rostral, the internasal forming a suture with the first upper labial. There is no loreal, and
Brachyophis
Genus of snakes
round pupil; the nostril is pierced in a minute nasal scale. No loreal, internasal, or temporal scales are present; the preocular can be present or absent;
Calamaria
Species of snake
above measuring one-third to two-fifths its distance from the frontal; internasals about half as long as the prefrontals; one pre- and two postoculars;
Bungarus_sindanus
Genus of snakes
pointed or upturned. The nostril is located between two nasals and an internasal. The frontal and supraocular scales are long. A loreal scale is present
Causus
Species of snake
appendage, not quite twice as long as the eye. There is no loreal; the internasals and prefrontals are in contact with the labials. The frontal is longer
Ahaetulla_perroteti
Subspecies of snake
dorsal surface of the head is distinctive. Instead of having a pair of internasals and a pair of prefrontals, as are found in most snakes including other
Midwestern_worm_snake
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INTERNASAL
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INTERNASAL
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