region triangularly infuscate, antennae and legs reddish yellow. The length
is 2.3 mm.
Casey. Two species are at present recognized in this genus. They are confined to the Pacific coast of
North America where they are very common in decaying seaweed. T. geniculata Mäklin is the most abundant staphylinid in decaying seaweed. It is entirely black and about 2.5 mm
long. T. pallidipes Casey is 3
mm long and has testaceous legs. The genus is separated from Atheta by the completely unmargined middle
coxal cavities which can be observed only by lifting the coxae. Although T. geniculata can be found in almost every
clump of decaying seaweed, its developmental stages and ecology remain a
combination of 5-segmented tarsi and 4-segmented maxillary palpi
characterizes this tribe. Members of this tribe are not characteristic of the
marine habitat but two species belonging to separate genera have beep
reported: Chilodera with
parallel abdomen, very finely sparsely pubescent body and Oxypoda with abdomen tapered to apex and
very densely pubescent.
Cameron. This genus was described in 1944 to accommodate the single species C. faulklandica Cameron from the Falkland
Islands found in seaweed. The head and abdomen are black with the pronotum
and elytra dark reddish brown. It is narrow, parallel sided, 3 mm long.
Mannerheim. This is a large genus with several hundred described species. The
species are usually teardrop shaped with the pronotum widest at base and the body
very densely covered with short pubescence. The species are often closely
allied and difficult to separate. One species, O.
tarda Sharp has been recorded from a salt marsh in England.
tribe differs from Oxypodini largely in that
the maxillary palpi are 5-segmented and the labial palpi 4-segmented. In each
case the penultimate segment is subulate and the terminal segment is a minute
appendage of it.
Aleochara Gravenhorst. Larvae of this large genus are ectoparasites on the pupae of flies within the fly puparium. It is a large genus of general distribution. Five species have been reported from seaweed in Great Britain by Fowler (1888), one, A. maritima Casey, from the east coast of North America and two from the Pacific coast of North America. A. sulcicollis Mannerheim is one of the most common staphylinids in seaweed in California. It is black with coarse sculpturing. A. arenaria Casey is less common. The elytra are pale and finely sculptured. Both species are to be found in carrion on the beach as well as seaweed. Host species of flies are not recorded for them.