Belongs within: Neuropterida. The Megaloptera, alderflies and dobsonflies, are a group of long-winged insects with aquatic predatory larvae. Recent species are divided between the families Sialidae and Corydalidae; Corydalidae have three ocelli and simple tarsi whereas Sialidae lack ocelli and have the fourth tarsal segment prominently bilobed. Males of some Corydalidae have the mandibles enormously… Continue reading Megaloptera


Belongs within: Myrmeleontiformia.Contains: Cymothales, Protoplectrini, Myrmeleontini, Distoleontini, Periclystina, Dendroleontina. The Myrmeleontidae, ant-lions, are a group of lacewings found in arid and semi-arid regions, best known for the conical pits built by the larvae of many species. The larva lies buried in the base of its pit, feeding on any insects that fall in. Most myrmeleontids… Continue reading Myrmeleontidae


Belongs within: Eumalacostraca.Contains: Squillidae, Gonodactyloidea, Lysiosquillidae. 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. They differ from other living crustaceans in being active, rapacious hunters (Schram… Continue reading Hoplocarida


Belongs within: Podogennonta. The Diosaccinae: worldwide sediment dwellers Published 16 May 2021 The harpacticoid copepods have been featured on this site a reasonable number of times now. These tiny crustaceans are among the most numerous animals in the world, both in terms of numbers of individuals and (in certain habitats) numbers of species. And among… Continue reading Diosaccinae

Categorised as Copepoda


Belongs within: Palaeocopida. The Youngiellacea are a group of very small ostracods known from the Upper Devonian and Carboniferous periods (Benson et al. 1961). Characters (from Benson et al. 1961): Carapace minute, suboblong, with straight taxodont hinge bearing vertical teeth and sockets. Surface smooth, reticulate or ridged. <==Youngielloidea [Youngiellacea] | i. s.: Schweyerina Zaspelova 1952BB61… Continue reading Youngielloidea


Belongs within: Clavatulidae. Eosurcula: a brief explosion Published 24 April 2024 The Claiborne Formation is an extensive accumulation of clays and sandstones extending across the southeastern USA, with outcrops in Arkansas, Illinois, Kentucky and Texas. It formed during the middle Eocene, over a series of rapid marine transgressions followed by slower regressions (Eargle 1968). The… Continue reading Eosurcula


Belongs within: Megachilini. Hackeriapis is an Australasian genus of relatively small resin bees, most of which (excepting some larger species) have strong transverse grooves on the second and third metasomal tergites (Michener 1965). Resinous confusion Published 12 February 2024 Australia (like most other parts of the world) is home to a wide diversity of solitary… Continue reading Hackeriapis


Belongs within: Lycosinae. The genus Lycosa has been used in the past for a diverse array of relatively large wolf spiders that construct silken burrows. It is now known to be polyphyletic in its earlier circumscriptions; the genus as currently recognised is most diverse in the western Palaearctic, but remains poorly defined and many species… Continue reading Lycosa


Belongs within: Opisthokonta.Contains: Volborthellida, Porifera, Rangeomorpha, Frondomorpha, Erniettomorpha, Eumetazoa. The Metazoa, animals, are generally multicellular and phagotrophic organisms with collagenous connective tissue uniting two dissimilar epithelia (Adl et al. 2012), though some of these features have been lost in derived parasitic forms such as Myxozoa. Relationships of the major subdivisions of animals remain contentious; classic… Continue reading Metazoa


Belongs within: Lytoceratida. The Gaudryceratidae are a lineage of ammonites known from the Barremian to the Maastrichtian of the Cretaceous (Wright et al. 1996). Characters (from Wright et al. 1996): Whorl section typically rounded or elliptical, sometimes depressed; shell ornamented with lirae or fine riblets, occasionally smooth, and with constrictions; suture with symmetrically bifid saddles… Continue reading Gaudryceratidae