Ricinulei

Template:Short description Template:Automatic taxobox 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) from Brazil to southern Texas, where they inhabit either leaf-litter or caves. As of 2022, 103 extant species of ricinuleids have been described worldwide, all in the single family Ricinoididae.<ref>Template:Cite journal</ref> 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, Ricinulei has a fossil-record spanning over 300 million years, including fossils from the Late Carboniferous of Euramerica and the Cretaceous Burmese amber.

Anatomy and physiology

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

File:Ricinulei from Fernandez & Giribet, nymph of Ricinoides atewa (2015) (cropped).jpg

Ricinoides atewa nymph from Ghana

Body

Ricinulei are typically about Template:Convert long. The largest Ricinulei known to ever exist was the Late Carboniferous Curculioides bohemondi with a body length of Template:Cvt.<ref name=Whalen2021>Niall Whalen, Paul Selden. "A new, giant ricinuleid (Arachnida, Ricinulei), from the Pennsylvanian of Illinois, and the identification of a new, ontogenetically stable, diagnostic character". Journal of Paleontology, Volume 95, Issue 3, May 2021, pp. 601 - 612 DOI: https://doi.org/10.1017/jpa.2020.104</ref> The cuticle (or exoskeleton) of both the legs and body is remarkably thick.<ref>Template:Cite journal</ref> 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 advantages of this unusual system are not well understood, and since the genital opening is located on the pedicel (another rather unusual feature) the animals have to 'unlock' themselves in order to mate. The abdomen is divided dorsally into a series of large plates or tergites, each of which is subdivided into a median and lateral plate.

File:Ricinulei from Fernandez & Giribet, male Ricinoides karschii from Campo Reserve, Cameroon (2015) (cropped).jpg

Male Ricinoides karschii from Campo Reserve, Cameroon

Appendages

The mouthparts, or chelicerae, are composed of two segments forming a fixed and a moveable digit. Sensory organs are also found associated with the mouthparts;<ref>Template:Cite journal</ref> 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.<ref>Template:Cite journal</ref> 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.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> In male ricinuleids, the third pair of legs are uniquely modified to form copulatory organs. The shape of these organs is very important for taxonomy and can be used to tell males of different species apart.<ref>Template:Cite journal</ref>

Internal anatomy

An older summary of ricinuleid internal anatomy was published by Jacques Millot.<ref>Template:Cite journal</ref> The midgut has been described,<ref>Template:Cite journal</ref> while the excretory system consists of Malpighian tubules and a pair of coxal glands. Female ricinuleids have spermathecae,<ref>Template:Cite journal</ref> presumably to store sperm. The male genitalia, sperm cells and sperm production have also been intensively studied.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Gas exchange takes place through trachea, and opens through a single pair of spiracles on the prosoma.<ref>Template:Cite book</ref> 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.<ref>Template:Cite journal</ref>

Distribution

Of the three living genera, Ricinoides inhabits tropical West Africa from The Gambia and Senegal, eastwards to the Congo and Gabon,<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Pseudocellus inhabits North and Central America from Panama to Southern Texas, as well as the Caribbean (including Cuba), while Cryptocellus ranges from Rondônia in western Brazil northwards to Honduras in Central America.<ref>Template:Cite journal</ref>

Behavior and life history

File:Ricinulei from Fernandez & Giribet, male Pseudocellus pearsei from Grutas Tzabnah, Yucatán, Mexico (2015) (cropped).jpg

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.<ref>Template:Cite journal</ref> Ricinulei feed on other small invertebrates, although details of their natural prey are sparse.<ref>Template:Cite journal</ref> Relatively little is known about their courtship and mating habits,<ref>Template:Cite journal</ref> 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.<ref>Template:Cite journal</ref> Ricinuleids are often found in large congregations, the exact purpose of which is unknown.<ref>Template:Cite journal</ref>

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;<ref>Template:Cite book</ref> 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,<ref>Template:Cite journal</ref> 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;<ref>Template:Cite book</ref><ref>Template:Cite book</ref><ref name=BzA10Ricinulei>Template:Cite book</ref><ref name=":0">Template:Cite journal</ref> Curculioides bohemondi, the largest of all Ricinulei, was a member of the Curculioididae.<ref name=Whalen2021/> Monooculricinuleus incisus and M. semiglobosus from Burmese amber were originally described as members of Ricinulei, but they might belong to Opiliones instead.<ref>Template:Cite journal</ref>

Some Carboniferous genera of Palaeoricinulei exceed modern Ricinulei in size, with bodies Template:Convert in length, and many appear to have had eyes, unlike modern representatives which are completely blind. It is likely they had a surface dwelling ecology, unlike that of modern Ricinulei.<ref>Template:Cite journal</ref> 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.<ref name=":0" />

Genera

Template:As of, the World Ricinulei Catalog accepts the following genera:<ref name="NMBE">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

• Ricinoididae Ewing, 1929 (103+ species)
  • Cryptocellus Westwood, 1874
  • Pseudocellus Platnick, 1980
  • Ricinoides Ewing, 1929
• † Curculioididae Cockerell, 1916 (12 species, Carboniferous)
  • † Amarixys Selden, 1992
  • † Curculioides Buckland, 1837
• † Hirsutisomidae Wunderlich, 2017 (4 species, Burmese amber)
  • † Hirsutisoma Wunderlich, 2017
• † Poliocheridae Scudder, 1884 (5 species, Carboniferous, ?Burmese amber)
  • † Poliochera Scudder, 1884
  • † Terpsicroton Selden, 1992
• † Primoricinuleidae Wunderlich, 2015 (1 species, Burmese amber)
  • † Primoricinuleus Wunderlich, 2015
• † Sigillaricinuleidae _{Wunderlich, 2022} (1 species, Burmese amber)
  • † Sigillaricinuleus Wunderlich, 2022

Relationships

Early work

In 1665, Robert Hooke described a large crab-like mite he observed with a microscope, he published a description of it in his book; Micrographia.<ref>Template:Cite book</ref> The first living ricinuleid described using Linnaean taxonomy was from West Africa by Félix Édouard Guérin-Méneville in 1838,<ref>Template:Cite journal</ref> i.e. one year after the first fossil. This was followed by a second living example collected by Henry Walter Bates in Brazil and described by John Obadiah Westwood in 1874,<ref>Template:Cite book</ref> and a third from Sierra Leone by Tamerlan Thorell in 1892.<ref>Template:Cite journal</ref> In these early studies ricinuleids were thought to be unusual harvestmen (Opiliones), and in his 1892 paper Thorell introduced the name "Ricinulei" for these animals as a suborder of the harvestman. Ricinuleids were subsequently recognized as an arachnid order in their own right in the 1904 monograph by Hansen & Soerensen. These authors recognised a group called "{{#invoke:Lang|lang}}", comprising spiders, whip spiders, whip scorpions and ricinuleids, which they defined as having a rather narrow join between the prosoma and opisthosoma and a small 'tail end' to the opisthosoma.

Ricinuleids and mites

Morphological studies of arachnid relationships have largely concluded that ricinuleids are most closely related to Acari (mites and ticks) though more recent phylogenomic studies refute this.<ref name="ReferenceA">Template:Cite journal</ref><ref>Template:Cite journal</ref> L. van der Hammen placed ricinuleids in a group called "Cryptognomae",<ref>Template:Cite journal</ref> together with the anactinotrichid mites only. Peter Weygoldt and Hannes Paulus referred to ricinuleids and all mites as "Acarinomorpha".<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> Jeffrey Shultz used the name "Acaromorpha".<ref>Template:Cite journal</ref><ref name="Shultz2007">Template:Cite journal</ref> This hypothesis recognizes that both ricinuleids and mites hatch with a larval stage with only six legs, rather than the usual eight seen in arachnids. The additional pair of legs appears later during development. Some authors have also suggested that the gnathosoma, a separate part of the body bearing the mouthparts, is also a unique character for ricinuleids and mites,<ref>Template:Cite book</ref> but this feature is rather complex and difficult to interpret and other authors would restrict the presence of a gnathosoma sensu stricto to mites only.

Ricinuleids and trigonotarbids

In 1892, Ferdinand Karsch suggested that ricinuleids were the last living descendants of the extinct arachnid order Trigonotarbida.<ref>Template:Cite journal</ref> This hypothesis was widely overlooked, but was reintroduced by Jason Dunlop in 1996.<ref>Template:Cite journal</ref> Characteristics shared by ricinuleids and trigonotarbids include the division of the tergites on the opisthososma into median and lateral plates and the presence of an unusual 'locking mechanism' between the two halves of the body. A further study subsequently recognised that the tip of the pedipalp in both ricinuleids and trigonotarbids ends in a similar small claw.<ref>Template:Cite journal</ref> Ricinuleids as sister group of trigonotarbids was also recovered in the 2002 study by Gonzalo Giribet and colleagues.<ref name="Giribet">Template:Cite journal</ref>

Phylogenomic studies

Recent phylogenomic studies have recovered different relationships than those previously suggested. An analysis in early 2019 suggested the sister group of the ricinuleids may be Xiphosura, the arthropod order containing horseshoe crabs.<ref name="ReferenceA"/> In response to this work, a more recent study placed Ricinulei and Opiliones as sister taxa.<ref>Template:Cite journal</ref>

Further reading

• Template:Cite journal

External links

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