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The broad-headed skink, P. laticeps, is similar, and may be difficult to distinguish from P. fasciatus. The former species usually lacks the two enlarged postlabial scales characteristic of P. fasciatus. [7] [8] Adult male broad-headed skinks, with their large size and swollen red head, are readily distinguished from P. fasciatus. [9]
Together with the Great Plains skink it is the largest of the "Plestiodon skinks", growing from a total length of 15 cm (5.9 in) to nearly 33 cm (13 in). A male broad-headed skink, illustration from Holbrook's North American Herpetology, 1842. The broad-headed skink gets its name from the wide jaws, giving the head a triangular appearance.
The coal skink mates in spring or early summer, laying a clutch of 8 or 9 eggs. Their eggs are typically around 10–11 mm in length. [5] Courting for this species usually involves the male's initial investigation and recognition of a potential female through pheromonal cues. [6]
The conspicuous coloring of species of Plestiodon is a survival trait: it attracts a predator's attention to the tail of the animal, which will break off when grabbed. A skink thus often manages to escape and hide under some rock, log, or fallen leaves while the predator still contemplates the wildly thrashing severed tail.
Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. [4] It ranges from species such as gibbons and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as chimpanzees and bonobos in which males' body sizes are larger than females' body sizes.
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The order Primates consists of 505 extant species belonging to 81 genera. This does not include hybrid species or extinct prehistoric species. Modern molecular studies indicate that the 81 genera can be grouped into 16 families; these families are divided between two named suborders and are grouped in those suborders into named clades, and some of these families are subdivided into named ...
The basic ranks are species and genus. When an organism is given a species name it is assigned to a genus, and the genus name is part of the species name. The species name is also called a binomial, that is, a two-term name. For example, the zoological name for the human species is Homo sapiens. This is usually italicized in print or underlined ...