Ricinulei


Also found in: Wikipedia.

Ricinulei

 

an order of the class Arachnida. The body, which reaches 1 cm in length, is divided into a cephalothorax and a wide, segmented abdomen. The abdomen ends in a small, tightly constricted section known as the postabdomen. The movable hood of the cephalothorax folds over small two-jointed chelicerae. A six-legged larva hatches from the egg (as in ticks). There are about 15 species, distributed in western Africa and South America.

Mentioned in ?
References in periodicals archive ?
Catalogue of the Smaller Arachnid Orders of the World: Amblypygi, Uropygi, Schizomida, Palpigradi, Ricinulei and Solifugae.
Entre los 129 capitulos que versan sobre la sistematica de Arthropoda, tres se refieren a taxones afines al grupo de artropodos: "Pentastomida", "Onychophora" y "Tardigrada"; en tanto que 126 resenan los taxones caracteristicos de Arthropoda, asi los grupos de Chelicerata se incluyen en 14 capitulos relativos a "Xiphosura", "Pycnogonida", "Palpigradi", "Schizomida", "Uropygi", "Amblypygi", "Solifugae", "Ricinulei", "Araneae" "Scorpiones", "Pseudoscorpionida", "Opiliones", "Acari" y "Oribatei (Acari)"; y en cuatro capitulos de Myriapoda se discuten "Symphyla", "Pauropoda", "Geophilomorpha" y "Diplopoda".
The male genital system of the New World Ricinulei (Arachnida): Ultrasctructure of spermatozoa and spermiogenesis with special emphasis on its phylogenetic implications.
A few species of the first true spiders, the Ricinulei, survive today as ``living fossils'' in tropical forests.
Ultrastructure of tarsal sensilla and other integument structures of two Pseudocellus species (Ricinulei, Arachnida).
Ricinulei is the second least diverse order of Arachnida, comprising 89 extant (including the two new species herein described) and 22 fossil species.
Only three of the ten Ricinulei specimens were dried because of their rarity in museum collections.
Several arachnid orders have pore-like chemosensory organs on the tarsus, including Amblypygi (Weygoldt 2000), Araneae (Foelix 1996), and Ricinulei (Talarico et al.
On Two Orders of Arachnida: Opiliones, Especially the Suborder Cyphophthalmi, and Ricinulei, Namely the Family Cryptostemmatoidae.
Ricinulei.--Fossil ricinuleids were revised by Selden (1992).
The extant Ricinulei are usually considered to lack eyes although they bear more or less distinct light spots on the cuticle that may be associated with light reception.
Ricinulei is one of the rarest arachnid orders, comprising 63 living species known to date.