Mottle brown Columbus crab found washed ashore. Port Alfred, Eastern Cape (2024). Also referred to as Gulfweed crab or flotsam crab. Conspicuous eyes in wide orbits at the corners of the wide front edge of the carapace. First pair of pereiopods - or walking legs - with a symmetrical pair of chelae - or claws… Continue reading Columbus crab (Planes minutus)
Category: Arthropods
Small goose barnacle (Lepas pectinata)
Small goose barnacles attached on a ram's horn squid shell washed on the beach. Port Alfred, Eastern Cape (2024). White small stalked barnacle with a light-brown always short peduncle. Body shelled with thick striated plates. Scutum round and broad, with a ridge so forward that it appears not to have one. Tergum triangular and pointy.… Continue reading Small goose barnacle (Lepas pectinata)
Goose barnacle (Lepas anserifera)
Close-up of goose barnacles attached on the sole of a shoe washed ashore. Port Alfred, Eastern Cape (2024). Off-white stalked barnacle. Shelled body flat, triangular in shape and compressed, wide at bottom and narrowing to a point.Shell plates (5) calcareous, not overlapping and with no gaps in between, with orange edges, covered with radiating ridges… Continue reading Goose barnacle (Lepas anserifera)
Beach hopper (Talorchestia capensis)
Blurry close-up of a beach hopper on a tuft of algae. Doringbaai, Western Cape (2020). Body off-white. First pair of antennae much shorter than second. Last three pairs of legs are elongated and splayed to the sides to support the animal upright.Second pair of legs bear large nippers in males. Between 10 and 20 mm.… Continue reading Beach hopper (Talorchestia capensis)
Marine springtail (Anurida maritima)
Springtail cruising on a rock surface. Doringbaai, Western Cape (2020) - iNaturalist Minute, mauve-coloured, six-legged, wingless creatures, covered in short waxy hairs. About 2-3 mm. During high tides, shelters in air pockets under rocks and shells, or in crevices. Emerges during low tide to scavenge, sometimes congregating around dead or dying animals. Often seen floating… Continue reading Marine springtail (Anurida maritima)
Tuberculate crab (Plagusia squamosa)
Composite image of the dorsal and underside view of a juvenile tuberculate crab recorded from the samples I processed during my PhD. Port Edward, KwaZulu-Natal (2022) - iNaturalist Also referred to as the scaly rock crab. Formerly considered a subspecies of Plagusia depressa (as Plagusia depress subsp. tuberculata). Similar to the Cape rock crab, except… Continue reading Tuberculate crab (Plagusia squamosa)
Pebble crab (Leucisca squalina)
Above and underside view of Leucisca squalina taken using a Leica microscope. Port Edward, KwaZulu-Natal (2022) - iNaturalist Carapace is light brown, sub-circular, broader than long, with a smooth dorsal surface and a moderately bi-lobed narrow front. Eyes hidden beneath the front. Chelipeds about half as long as carapace. Legs not granulated. Male abdomen with… Continue reading Pebble crab (Leucisca squalina)
Yellow-banded hermit crab (Clibanarius virescens)
Specimen of yellow-banded hermit crab peaking out of a scaly dogwhelk (Nucella squamosa) shell and trying to flip himself. Port Alfred, Eastern Cape (2024). Body olive-green. Nippers about equal in size, spotted with yellow. Fingers yellow with black tips. Walking legs banded with yellow. Between 10 and 20 mm. Abundant hermit crab in mid-to-high shore… Continue reading Yellow-banded hermit crab (Clibanarius virescens)
Sand shrimp (Palaemon pacificus)
Sand shrimp caught in a rock pool. Port Alfred, Eastern Cape (2022). Transparent, with vertical bars across the body. Opaque when preserved. Front legs with slender nippers and yellow spots at the joints. Rostrum well developed, toothed and almost saw-like. Between 25 mm. Lives in intertidal pools and shallow areas with a sandy bottom. Scavenges… Continue reading Sand shrimp (Palaemon pacificus)
Blue-eyed hermit crab (Calcinus laevimanus)
Both hermit crabs live in the shells of Lunella coronata (formerly Turbo coronatus). Port St Johns, Wild Coast, Eastern Cape (2021) - iNaturalist Also called left-handed hermit crab. Nippers dark brown with white fingers, that of the left side greatly enlarged to block the shell opening when the crab withdraws. Eyes blue, eyestalks and first… Continue reading Blue-eyed hermit crab (Calcinus laevimanus)
