Ricinulei facts for kids

Quick facts for kids Ricinulei Temporal range: Late Carboniferous–Recent PreЄ Є O S D C P T J K Pg N
Cryptocellus goodnighti
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Ricinulei Thorell, 1876
Family:	Ricinoididae Ewing, 1929
Exant genera
Cryptocellus Pseudocellus Ricinoides For fossil genera, see text

Ricinulei is a small order of arachnids. Like most arachnids, they are predatory, eating small arthropods. They occur today in west-central Africa (Ricinoides) and the Americas (Cryptocellus and Pseudocellus) as far north as Texas. As of 2021, 91 extant species of ricinuleids have been described worldwide, all in the single family Ricinoididae. In older works they are sometimes referred to as Podogona. Due to their obscurity they do not have a proper common name, though in academic literature they are occasionally referred to as hooded tickspiders.

In addition to the three living genera, there are fossil species from the upper Carboniferous of Euramerica and the Cretaceous Burmese amber.

Description

The most important general account of ricinuleid anatomy remains the 1904 monograph by Hans Jacob Hansen and William Sørensen. Useful further studies can be found in, e.g., the work of Pittard and Mitchell, Gerald Legg and L. van der Hammen.

Ricinoides atewa nymph from Ghana

Body

Ricinulei are typically about 5 to 10 millimetres (0.2 to 0.4 in) long. The largest of ever existed Ricinulei was the Late Carboniferous Curculioides bohemondi with a body length of 21.77 mm (0.857 in). The cuticle (or exoskeleton) of both the legs and body is remarkably thick. Their most notable feature is a "hood" (or cucullus) which can be raised and lowered over the head. When lowered, it covers the mouth and the chelicerae. Living ricinuleids have no eyes, although two pairs of lateral eyes can be seen in fossils and even living species retain light-sensitive areas of cuticle in this position.

The heavy-bodied abdomen (or opisthosoma) exhibits a narrow pedicel, or waist, where it attaches to the prosoma. Curiously, there is a complex coupling mechanism between the prosoma and opisthosoma. The front margin of the opisthosoma tucks into a corresponding fold at the back of the carapace. The abdomen is divided dorsally into a series of large plates or tergites, each of which is subdivided into a median and lateral plate.

Male Ricinoides karschii from Campo Reserve, Cameroon

Appendages

The mouthparts, or chelicerae, are composed of 2 segments forming a fixed and a moveable digit. Sensory organs are also found associated with the mouthparts; presumably for tasting the food. The chelicerae can be retracted and at rest they are normally hidden beneath the cucullus.

Ricinuleid pedipalps are complex appendages. They are typically used to manipulate food items, but also bear many sensory structures and are used as 'short range' sensory organs. The pedipalps end in pincers that are small relative to their bodies, when compared to those of the related orders of scorpions and pseudoscorpions. Similar pincers on the pedipalps have now been found in the extinct order Trigonotarbida (see Relationships).

As in many harvestmen, the second pair of legs is longest in ricinuleids and these limbs are used to feel ahead of the animal, almost like antennae. If the pedipalps are 'short range' sensory organs, the second pair of legs are the corresponding 'long range' ones. Sensilla on the tarsi at the ends of legs I and II (which are used more frequently to sense the surroundings) differ from those of legs III and IV. In male ricinuleids, the third pair of legs are uniquely modified to form sex organs. The shape of these organs is very important for taxonomy and can be used to tell males of different species apart.

Internal anatomy

An older summary of ricinuleid internal anatomy was published by Jacques Millot. The midgut has been described, while the excretory system consists of Malpighian tubules and a pair of coxal glands. Gas exchange takes place through trachea, and opens through a single pair of spiracles on the prosoma. At least one Brazilian species appears to have a plastron, which may help it prevent getting wet and allow it to continue to breathe, even if inundated with water.

Biology

Male Pseudocellus pearsei from Grutas Tzabnah, Yucatán, Mexico

Ricinuleids inhabit the leaf litter of rainforest floors, as well as caves, where they search for prey with their elongate sensory second leg pair. Ricinulei feed on other small invertebrates, although details of their natural prey are sparse. Relatively little is known about their courtship and mating habits, but males have been observed using their modified third pair of legs to transfer a spermatophore to the female. The eggs are carried under the mother's hood, until the young hatch into six-legged larva, which later molt into their eight-legged adult forms. The six-legged larva is a feature they share with Acari (see Relationships). Despite the scarce number of studies about the biology of this group, recent studies have reported nocturnal habits, as well as novel behaviors for this group, which include interactions between individuals different than mating. Ricinuleids are often found in large congregations, the exact purpose of which is unknown.

Fossil record

Ricinulei are unique among arachnids in that the first one to be discovered was a fossil, described in 1837 by the noted English geologist William Buckland; albeit misinterpreted as a beetle. Further fossil species were added in subsequent years by, among others, Samuel Hubbard Scudder, Reginald Innes Pocock and Alexander Petrunkevitch.

Fifteen of the twenty species of fossil ricinuleids discovered so far originate from the late Carboniferous (Pennsylvanian) Coal Measures of Europe and North America. They were revised in detail in 1992 by Paul Selden, who placed them in a separate suborder, Palaeoricinulei. The fossils are divided into four families: Curculioididae, Poliocheridae, Primoricinuleidae and Sigillaricinuleidae. The poliocherids are more like modern ricinuleids in having an opisthosoma with a series of three large, divided tergites. Curculioidids, by contrast, have an opisthosoma without obvious tergites, but with a single median sulcus; a dividing line running down the middle of the back. This superficially resembles the elytra of a beetle and explains why Buckland originally misidentified the first fossil species. Five species: ?Poliochera cretacea, Primoricinuleus pugio, Hirsutisoma acutiformis, H. bruckschi, H. grimaldii and H. dentata, are known from the Cenomanian (~ 99 million years old) Burmese amber of Myanmar; Curculioides bohemondi, the largest of all Ricinulei, was a member of the Curculioididae. Monooculricinuleus incisus and M. semiglobosus from Burmese amber were originally described as members of Ricinulei, but they might belong to Opiliones instead.

Some Carboniferous genera of Palaeoricinulei exceed modern Ricinulei in size, with bodies 24 millimetres (0.94 in) in length, and many appear to have borne eyes, unlike modern representatives which are completely blind. It is likely they had a surface dwelling ecology unlike that of modern Ricinulei. The fossil genera from the Cretaceous Burmese amber are referred to the extinct order Primoricinulei, and are thought to have had a different ecology than modern species as tree-dwelling predators that crawled on bark.

Genera

As of September 2022^[update], the World Ricinulei Catalog accepts the following eleven genera:

See also

In Spanish: Ricinulei para niños