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Wikipedia / Dipodoidea

Dipodoidea is a superfamily of rodents, also known as dipodoids, found across the Northern Hemisphere. This superfamily includes over 50 species among the 16 genera in 3 families. They include the jerboas (family Dipodidae), jumping mice (family Zapodidae), and birch mice (family Sminthidae). Different species are found in grassland, deserts, and forests. They are all capable of saltation (jumping while in a bipedal stance), a feature that is most highly evolved in the desert-dwelling jerboas.

Taxonomy

Formerly, Dipodoidea contained only a single large family, Dipodidae, which contained jerboas, jumping mice, and birch mice as subfamilies. However, phylogenetic evidence found all three to be distinct families from one another, and thus they were split into three different families within Dipodoidea.

Characteristics

Dipodoids are small to medium-sized rodents, ranging from in body length, excluding the tail. They are all adapted for jumping, although to varying degrees. The jerboas have very long hind legs which, in most species, include cannon bones. They move either by jumping, or by walking on their hind legs. The jumping mice have long feet, but lack the extreme adaptations of the jerboas, so that they move by crawling or making short hops, rather than long leaps. Both jerboas and jumping mice have long tails to aid their balance. Birch mice have shorter tails and feet, but they, too, move by jumping.

Most dipodoids are omnivorous, with a diet consisting of seeds and insects. Some species of jerboa, however, such as Allactaga sibirica, are almost entirely insectivorous. Like other rodents, they have gnawing incisors separated from the grinding cheek teeth by a gap, or diastema. The dental formula for dipodids is: Jerboas and birch mice make their nests in burrows, which, in the case of jerboas, may be complex, with side-chambers for storage of food. In contrast, while jumping mice sometimes co-opt the burrows of other species, they do not dig their own, and generally nest in thick vegetation. Most species hibernate for at least half the year, surviving on fat that they build up in the weeks prior to going to sleep.

Dipodoids give birth to litters of between two and seven young after a gestation period of between 17 and 42 days. They breed once or twice a year, depending on the species.

Classification

Extant species

Superfamily Dipodoidea

Family Sminthidae

Genus Sicista, birch mice

Family Zapodidae, jumping mice

Genus Eozapus

Genus Napaeozapus

Genus Zapus

Family Dipodidae, jerboas

Subfamily Allactaginae

Genus Allactaga

Subgenus Allactaga

Subgenus Orientallactaga

Subgenus Paralactaga

incertae sedis

Genus Scarturus

Genus Allactodipus

Genus Pygeretmus, fat-tailed jerboas

Subfamily Cardiocraniinae

Genus Cardiocranius

Genus Salpingotulus

Genus Salpingotus, pygmy jerboas

Subgenus Anguistodontus

Subgenus Prosalpingotus

Subgenus Salpingotus

Subfamily Dipodinae

Tribe Dipodini

Genus Dipus

Genus Eremodipus

Genus Jaculus

Genus Stylodipus, three-toed jerboas

Tribe Paradipodini

Genus Paradipus

Subfamily Euchoreutinae

Genus Euchoreutes, long-eared jerboa

Fossil genera

Dipodoidea has a well-documented fossil record dating back to the Eocene. These fossil species are definitively known:

Family †Simimyidae

Primisminthus from the middle Eocene of China could be the oldest member of the group, while Banyuesminthus, also from the middle Eocene of China, could represent a sister group to the rest of the Dipodoidea.

References