Species Of Spider Crab Research Articles

Spider crabs of the family Majidae (Crustacea: Brachyura) from the Philippine Islands

Summary The Philippine cruise of the U.S. Fisheries Steamer Albatross 1907–10 collected 61 species of spider crabs from the Philippine Islands bringing the total number of species known from the area to 71; 28 new species were described by Rathbun and the present report records 19 species not previously known from the area; included are nine widespread Indo-west Pacific forms, four previously known from Japan and four Indian Ocean species. Hyastenus sebae White is renamed H. whitei and the former name is applied to H. oryx A. Milne Edwards. Hyastenus tuberculosus Rathbun is confirmed as a synonym of H. convexus Miers, Platymaia remifera Rathbun is reduced to synonomy with P. wyvillethomsoni Miers and Chorilia sphenocarcinoides Rathbun is transferred to the genus Sphenocarcinus. The majority of species (51) occur around the central and southern islands of the archipelago and most of these (35 speciesl occur at varying depths on the continental shelf. Twelve species occur intertidally and 21 species are kno...

THE BIOLOGY OF MANX SPIDER CRABS

The biology of the fourteen species of spider crabs occurring in the Isle of Man area was investigated, particular attention being given to their distribution, food, moulting cycle and breeding. The distribution of a species is related to the type of bottom deposit, and members of a genus have complementary distributions. There is a variable degree of diet selection and food availability is an important factor in determining distribution. The moult of puberty, which in all cases is the terminal eedysis, is well defined in all species. There are two patterns of breeding, one continuous throughout the year, the other with a single annual hatching. With few exceptions the relative growth of the chelae is allometric, exhibiting marked sexual dimorphism.

THE LARVAL DEVELOPMENT OF BRITISH COLUMBIA BRACHYURA: II. MAJIDAE, SUBFAMILY OREGONIINAE

The larval stages of two species of spider crabs from British Columbia are described from eggs hatched in the laboratory. Both Oregonia gracilis Dana and Hyas lyratus Dana were found to have two zoeal stages before the megalopal.