IDGuide Marinenonnativespecies - Home | Marine ... Marinenonnativespecies Alarge,golden-brownkelp...
Transcript of IDGuide Marinenonnativespecies - Home | Marine ... Marinenonnativespecies Alarge,golden-brownkelp...
ID GuideMarine non native species
A large, golden-brown kelp
Key ID features:� 1-3m in length, consisting of a
divided frond with a mid-rib
� very frilly with lots of “ribbons”just above the root-likeholdfast
� has a long stipe
Similar to: native kelpssuch as Saccorhiza polyschideswhich does not have a mid-riband has a knobbly, bulbous -holdfast
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WakameUndaria pinnatifida
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Orange-striped anemoneHaliplanella lineata
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Darwin's barnacleElminius modestus
A barnacleKey ID features:� small cone shaped shell up to
1cm across
� white-grey in colour
� Diamond shaped opening
� shell has 4 plates
Similar to: Semibalanus balanoides, which also has adiamond-shaped opening. Elminius modestus can be positivelyidentified by only having four outer shell plates, other specieshave six
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Please report your sighting on the Marlin website www.marlin.ac.uk/rml or phone 01752 633291
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WireweedSargassum muticumA type of brown seaweed
Key ID features:� A large olive-brown seaweed
with fronds often over 1m long
� A main axis or stipe bearsalternating secondarybranches, giving characteristic“washing line” appearance outof water
� Branches withsmall,flattenedleaflets andspherical gasbladders Jo
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Toothed leaflet
Spherical gas bladders
An anemoneKey ID features:� Up to 4cm tall, (usually 1-2cm)
with a smooth and cylindricalcolumn
� Generally olive green or brownwith contrasting vertical stripes(stripes are usually orange incolour, less commonly yellow or white stripes)
� Up to 100 slender tentacles, these and their supportingplatform greyish
Distinguished by: the vertical stripeson the column. Young specimens ofplumose anemone (Metridium senile)
may be similar ingeneralform, but arenever striped
MCS ID sheet:Layout 1 17/8/11 16:50 Page 1
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Information provided byMarine Biological Association
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Striped barnacleBalanus amphitrite
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Slipper LimpetCrepidula fornicata
Leathery sea squirtStyela clavaA sea squirt
Key ID features:� A brown sea squirt up to 20cm tall
� Attached by narrow stalk(underdeveloped when very small)
� two tube like openings (siphons)on top which have dark brownstripes on the inside
� surface istough andleathery,lookslumpy.
Male
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registered charity no (england & wales): 1004005registered charity no (scotland): sC037480
www.mcsuk.org
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John Bishop / MBA of the Uk
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A barnacle
Key ID features:� A white or pinkish barnacle
growing to 1cm in diameteror more
� Large diamond shapedopening
� six outer shell plates relativelysmooth, with groups of purple orpink stripes tapering from thebase
� four dark bands crosstissue flaps borderingthe opening
A gastropod mollusc – a type ofsea snail
Key ID features:� often found in curved chains of
up to 12 individuals with largeshells at the bottom and smaller
ones ontop
�Domedshell, oval or kindey shaped up to5cm long with distinctive slipper-like internal shelf
�shell can be white, cream, yellowor pinkish in colour, with streaksor blotches of red or brown
Japanese skeleton shrimpCaprella muticaAn amphipod crustacean
Key ID features:� A slender, reddish, shrimp-like
animal
� Males up to 45mm long with twoelongated body segments behindthe head, the hindmost of whichhas a pair of large graspingappendages
� females smaller (to 15mm) withoutconspicuously elongated segments orenlarged appendages, but with redspotted brood pouch on underside
� Both sexes have spines along back
� Larger than native skeleton shrimps
Pacific oysterCrassostrea gigasA bivalve mollusc
Key ID features:� thick, rough, hinged shell up to
18cm long
� Markedly wavy orsaw-toothed shell margin
� shell may have dark purplepatches
Similar to: native oyster Ostrea edulis,which has more numerous but muchweaker ridges and much less wavy shellmargin. Crassostrea gigas tends to bemore elongate in shape whereas Ostreaedulis can be almost circular
A crab
Key ID features:� Large crab up to 8cm across
� Grey-green to dark brown incolour with paler legs, which aretwice the length of the body.
� near-hexagonal body shapenarrowing towards the front
� 4+4+4 pattern of teeth aroundfront end of body and deepcentral notch between the eyes
� Distinguishing feature in adultcrabs is the dense mat of hair onthe claws. the leading edges ofthe legs are also very hairyphiL CrABB/ nAtUrAL historY MUseUM
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Chinesemitten crabEriocheir sinensis
MCS ID sheet:Layout 1 17/8/11 16:51 Page 2