Fin whale at Cove Rock – one year later

Today marks the 1st anniversary of the death of the female Fin whale which stranded at Cove Rock. It was a very sad moment to walk onto the beach last year this time and see a majestic creature such as she was succumbing to the labours of being beached.

All that remains today are parts of the skull. This will hopefully still be collected by the museum.

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Adding another special Thorny Seahorse to the record ….

Mr Michael Vermaak kindly reminded the museum that he had submitted a photographic seahorse record for identification earlier in the year (January 2017). Reviewing the data this was noted and it had not been identified to the species level. SAIAB fish scientist in Grahamstown, Ofer Gon,  confirmed the seahorse to be the same as the recent find at the Orient Beach (see the post below)- Hippocampus histrix (Thorny Seahorse), though it may be a juvenile specimen.

Michael found the seahorse on the beach between the Nahoon River and Bonza Bay last December (2016). The is the first record from this stretch of beach and it is interesting to note two similair specimens in close location found in recent times, considering the last East London record for H. histrix was in 1991 (EL Harbour mouth). He is sincerely thanked for reporting this to the museum. Below is an illustration of the seahorse.

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Thorny Seahorse, Hippocampus histrix, found by Michael Vermaak of East London along the beach between Bonza Bay and the Nahoon River

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Thorny Seahorse found at the Orient Beach (East London)

Last Thursday (11 May 2017) it was reported to the museum that a seahorse had been found and released at the Orient Beach (East London). Shane Roach contacted the museum after listening to the radio programme called ‘Our World’ on WCFM 98.6 Mhz (every Thursday at 16h30). During the program museum scientist, Kevin Cole, reported on a number of unusual marine specimens which had washed up during a spell of very cold water. Shane shared a record of a brightly coloured seahorse which had been found by Roger Elliot on Saturday 6th May 2017. Sea temperatures had dropped below 11 degrees Celsius during the preceding week. The seahorse was identified as Hippocampus histrix, the Thorny Seahorse.

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Thorny Seahorse, Hippocampus histrix, found by Roger Elliot of East London

SAIAB (South African Institute of Aquatic Biodiversity) fish scientist, Ofer Gon, was contacted about the find. He detailed previous records lodged at SAIAB for the East London area. These are listed below:

SAIAB 1380 – Kaysers Beach, 01/May/1969

SAIAB 38532 – Haga-Haga, 01/April/1989

SAIAB 39242 – East London, Harbor mouth, 10/May/1991

Seahorses occur worldwide in tropical and temperate seas. The most common seahorse along our coast is Hippocampus kuda. See an earlier post on this (14th September 2011).

Their  bodies are armoured with dermal plates forming a tubular series of rings. They have a small mouth at the end of a snout. The body has no scales and there is a difference in size between males and females. The males can carry eggs which have been fertilised either on a concealed pouch or a fold of skin or the eggs can be exposed. Seahorses vary in size from 2-65 cm.

This was a special find for East London, considering the last one was in 1991 and Shane and Roger are thanked for revealing this marine species to the museum.

Reference: Coastal Fishes of southern Africa by Phil and Elaine Heemstra (SAIAB 2004).

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Winged robbers …… flies of a different sort

A large fly recently settled on a wall in Beacon Bay (EL) and was identified as one of the species of robber flies found in the region. With a wingspan of close to 25 mm, this species, Alcimus tristrigatus, was resting on a wall and may have been attracted to a body of water close by. When resting on the ground they can mimmick short-horned grasshoppers (a major prey item). The robber flies belong to the insect family called Asilidae and are generally recognisable by being  bristly and the top of the hairy head hollowed into a deep groove. Preying on other insects which are normally caught in flight, they are voracious and have powerful legs to subdue prey. Prey species include bees, wasps and grasshoppers.

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Robber fly (Alcimus tristrigatus)

 

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In the field with palaeontologist Dr Rob Gess

Museum scientist, Kevin Cole, recently spent time with Grahamstown palaeontologist, Dr Rob Gess. A field outing to road cutting close to Grahamstown proved to be an amazing meander back in time to the Devonian period (about 368 million years ago).

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Dr Rob Gess

Passion and dedication on the part of Rob has resulted in some wonderful finds for science. Many years ago he had the foresight to collect a lot of rock separated out mechanically for a road cutting. This rock later revealed interesting fossilised extinct fish species, young coelacanths and the worlds earliest evidence of a scorpion. The interpretation of some of the science can be seen on display at the Albany Museum in Grahamstown (see photo below).

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The display carries large colourful illustrations  ….. fish with armoured plated heads, lampreys (no bone in their bodies), spiny finned fishes (ancestors to sharks), lobed-finned fish, lung fish and fish with jointed armed appendages (see illustrations below).

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Back in the lab at Rob’s office in Grahamstown rock specimens were presented and one of the samples clearly showed the pincer of a late Devonian scorpion (360 million years old) and another sample the fossil tail with the sting of the scorpion. At that time South Africa was part of a giant landmass known as Gondwana (which later split up into Antarctica, South America, Madagascar, India and Australia). This find represents the earliest land living (terrestrial) animal on this ancient landmass. This new species was named Gondwanascorpio emzanziensis (see photo below).

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Beaked whale update …. identification of the True’s beaked whale from Winterstrand

The whale stranded last year (19th October 2016) has been positively identified as a True’s beaked whale (Mesoplodon mirus) after the skull was macerated.  This was also confirmed after the teeth were surgically removed for identification by museum scientist Kevin Cole.

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True’s beaked whale on the beach east of the seaside village of Winterstrand. Photo: Kevin Cole ELM

The whale was reported by members of the public to Siani Tinley of the East London Aquarium and a first investigation revealed a bloated specimen with innards expressed at the mouth. The first record for South Africa of the species was a stranding in 1959.

The unique marking of the whale was not visible as the skin had started to darken after the animal had died and been exposed to the sun for a period of time. The usual markings for the species is illustrated below.

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True’s beaked whale – Reference: Whales and dolphins of the southern African subregion by Peter Best (Cambridge University Press 2007)

There have been no authenticated sightings at sea in the southern African subregion of these whales. Four stomachs examined for South African specimens stranded revealed a diet of unidentified fish species and 2 squid species.

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Mouth part of the whale illustrating the  lack of any visible teeth. Photo: Kevin Cole ELM

A single pair of mandibular teeth are only visible in the adult male of this species. The teeth do not erupt in adult female and juvenile True’s beaked whales. The stranded animal recorded here was a female (also confirmed by the genital anatomy and presence of mammalian glands).

The macerated skull revealed a long, broad based rostrum and the two teeth removed were consistent with the dimensions of an adult female (2.4-3.1 cm).

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Skull of the True’s beaked whale prepared by the East London Museum. Photo: Kevin Cole ELM

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Mandibular teeth (a single pair) removed from the female True’s beaked whale at Winterstrand. Photo: Kevin Cole ELM

There is no accurate population estimate on the species in the world’s oceans (they occur in the northern hemisphere as well). One of the  threats to the species is the negative effect of loud sounds generated when seismic exploration takes place (in search of gas and oil). This may have caused the demise of this species as seismic activity was recorded in our oceans a few months before this animal stranded.

Dr Greg Hofmeyr, Marine Mammal Curator at Bayworld Museum (Port Elizabeth, South Africa) is thanked for sharing his knowledge on marine mammals and for his encouragement to document cetacean strandings.

Wojtek Bachara, a Ziphiidae consultant from Poland, is also thanked for his input on beaked whales.

 

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Common Brown Water Snake biting off more than it can chew …

Jimmy and Janet Calder presented the museum with a ‘double specimen’ when they deposited a juvenile Common Brown Water Snake (Lycodonomorphus rufulus) which had died attempting to consume a Tropical House Gecko on their property recently. The tail section of the gecko was still exposed on death and it is assumed that both species died as a result of internal injuries caused by the snake trying to consume a live gecko.

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This is a good natural history record and Bayworld museum herpetologist, Werner Conradie, would like the gecko specimen to be sent to the University of the Western Cape as they are undertaking research on this species. He is thanked for confirming the species names. Tropical House Geckos are able to change colour – those individuals living close to lights which are on all night are usually very pale and sometimes appear translucent. The illustration below shows several pads under each toe which are divided down the middle of the toes into about five pairs. Each toe has a retractable claw.

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Original tails are longer than the body length and have 6 rows of backward pointing tubercles. They can reach a length of between 60-90mm.

The Common Brown Water Snake is a constrictor and can reach a length of up to 700 mm. The specimen illustrated below is a juvenile and these nocturnal and terrestrial snakes prefer moist habitats.

They are harmless to humans. Sometimes they are confused with other species such as the Brown House Snake. Females lay a clutch of 6-23 eggs which take about 2 months to hatch.

Kevin Cole

Reference: A guide to the reptiles of southern Africa by Graham Alexander and Johan Marais (Struik Publishers 2008)

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