Tomocerus minor, copyright Francisco Welter-Schultes. Belongs within: Collembola. The Tomoceridae are a group of elongate springtails in which the third abdominal segment is longer than the fourth (Womersley 1939). Characters (from Womersley 1939): Postantennal organ absent. Abdominal segment 3 longer than 4, all tergites free. With or without scales, if present then these with longitudinal… Continue reading Tomoceridae


Campodea staphylinus, copyright Michel Vuijlsteke. Belongs within: Diplura. The Campodeoidea are a group of diplurans with filiform cerci and lacking abdominal spiracles (Ferguson 1990). Characters (from Ferguson 1990): Trichobothria present, beginning on antennal segment 3; mandible with lacinia mobilis (prostheca); maxilla without palpus, lacinia without pectens; urosternite 1 without styli, with one pair of subcoxal… Continue reading Campodeoidea


Heterojapyx novaezelandae, copyright Bugman-NZ.Belongs within: Panhexapoda. Contains: Campodeoidea, Japygidae. The Diplura are a cosmopolitan group of slender-bodied, wingless, blind hexapods that are mostly found in damp soil under logs and stones (Condé & Pagés 1991). Characters (from Condé & Pagés 1991): Small to large, narrow-bodied hexapods, mostly unpigmented; eyes absent; antennae moniliform, with intrinsic muscles… Continue reading Diplura


Metajapyx suterraneus, copyright Christopher C. Wirth. Belongs within: Diplura. The Japygidae are a group of diplurans with forcipate cerci and trichobothria on segments 4–6 of the antennae (Condé & Pagés 1991). Characters (from Condé & Pagés 1991): Trichobothria present on segments 4–6 of antenna; mandible without prostheca; labial palps present; four pairs of thoracic spiracles;… Continue reading Japygidae

Platybunus: the Wide-Eyed Harvestmen of Europe

The western Palaearctic region (that is, Europe and the immediately adjacent parts of Asia and northern Africa) is home to a diverse and distinctive fauna of harvestmen. Among the various genera unique to this part of the world are the forest- and mountain-dwellers of the genus Platybunus. Platybunus pinetorum, copyright Donald Hobern. Platybunus species are… Continue reading Platybunus: the Wide-Eyed Harvestmen of Europe


Rock bristletail Machiloides banksi, copyright Katja Schulz. Belongs within: Archaeognatha. The Meinertellidae are a group of bristletails found primarily in the Southern Hemisphere, characterised by very small abdominal sterna which only protrude slightly, if at all, between the coxites, no scales on the legs, scape and pedicel, and male terminalia with a very short penis… Continue reading Meinertellidae


Heterosquilla tricarinata, copyright Svamp. Belongs within: Eumalacostraca. Contains: Squillidae, Lysiosquillidae, Gonodactyloidea. The Hoplocarida, including the mantis shrimps and their fossil relatives, are a group of malacostracan crustaceans bearing a small carapace and at least four free thoracic segments, together with a large abdomen ending in a tail fan. <==Hoplocarida |  i. s.: Neogonodactylus RS10 |           |–N.… Continue reading Hoplocarida


Enoplocytia leachii, from here.Belongs within: Reptantia. Contains: Astacida, Homarida. The Astacidea are a clade of decapod crustaceans including the clawed lobsters and crayfish, with most modern representatives having well-developed chelae on the first pereiopods. Characters (from Amati et al. 2004): Cephalothorax subcylindrical; rostrum and abdomen well developed; frontal portion of carapace not fused with epistome;… Continue reading Astacidea


Potamon fluviatilis, copyright Fabio Liverani.Belongs within: Gecarcinucidae. Contains: Potamonautidae. The Potamoidea are a group of freshwater and semi-terrestrial crabs found in tropical and subtropical regions of the Old World. Members are characterised by males having the distal section of the second gonopods forming a closed tube. <==Potamoidea |–Sundathelphusidae H86 |    |–Perithelphusa borneensis (von Martens 1868) H86… Continue reading Potamoidea


Red swamp crayfish Procambarus clarkii, copyright Greg Peterson. Belongs within: Astacida. Procambarus is a North American genus of fairly generalised freshwater crayfish. <==Procambarus Ortmann 1905 H86 |–P. (Austrocambarus Hobbs 1972) H86 |    |–P. (A.) cubensis H86 |    |    |–P. c. cubensis H86 |    |    `–P. c. rivalis (Faxon 1912) H86 |    |–P. (A.) mirandai Villalobos 1954 H86 |    |–P. (A.) niveus Hobbs… Continue reading Procambarus