Dive Report

15-04-2021 Where’s Dewley

Apr 15, 2021

DAY/DATE

Thursday

15/04/2021

SITE/S

Where’s Dewley

Arkwright Shoals

PARTICIPANTS

Julie, David

 

TYPE

Subtidal

 

MODE

Boat Dives

 

VESSEL

More Mischief

 

DIVE

1

2

SITE/S

Where’s Dewley

Where’s Dewley

SPECIES #

19

14

DURATION

78 Min

68 Min

DEPTH/RANGE

9-14 m

9-14 m

TEMP.

24 C

24 C

VIS.

10 m

10 m

SURGE

Mod

Mod

CURRENT

Nil

Nil

COMMENTS & OBSERVATIONS

We took More Mischief up the coast to the Arkwright Shoals in the hope of cleaner water. The top 6 metres was quite green but the viz opened up beneath to give us up to 10 m viz although that top layer made it a little dark. Terry was onboard but sat out the dives as recommended for post Covid inoculation. No current and great surface conditions made for a comfortable journey and diving apart from some surge in the shallower parts. The Hypselodoris tryoni was small but also oval in shape rather than elongate and the submarginal mantle band was wider than usual. Both these features had us a little baffled at first, however the purple rhinophore clubs and the possession of only two marginal bands to the mantle confirm that it is more likely Hypselodoris tryoni than Goniobranchus kuniei. The Hypselodoris whitei had its buccal mass extended feeding on a sponge. Phyllidia sp. 04 continues to show up in the region. Carefully examination of the tufts of  Aglaophenia hydroids revealed some Tenellia sp. 01. Three specimens (a pair and a singleton) of a different looking Phyllidia sp. were sighted. These are similar to Phyllidia sp. 04 externally, except that they do not exhibit black rays forming blue crescents laterally. Instead they exhibit many smaller and crowded pustules laterally. We will put these under Phyllidia sp. 04 for now.

Taxonomic Diversity:
All species of sea slugs sighted were nudibranchs. 19 of the 27 were dorid nudibranchs. 9 species, a third of the total belonged to the Chromodorididae family. 8 were porostomes all belonging to the Phyllididae family. 3 were phanerobranchs.

Our Historical data:
– 18 surveys conducted at this site since 08/11/2013.
– Last surveyed 22/10/2020.

Key to symbols
+++ New Species
+ First time sighted at this site
# Most commonly sighted at this site with %

TOTAL SPECIES SIGHTED: 27

 

SPECIES LIST – ALPHABETICAL

Bornella anguliia -/5
Chromodoris elisabethina 1/-
Chromodoris kuiteri 3/-
Doriprismatica atromarginata 7/8 # 100%
Glossodoris rufomarginata 1/-
Glossodoris vespa 2/1 # 83%
Goniobranchus splendidus -/2
Gymnodoris sp. 14 -/1 +
Hexabranchus sanguineus -/1
Hypselodoris jacksoni -/2 # 94%
Hypselodoris tryoni 1/- +
Hypselodoris whitei 1/-
Phyllidia elegans 2/-
Phyllidia exquisita 1/-
Phyllidia ocellata 1/1
Phyllidia picta 1/-
Phyllidia sp. 04 5/- +
Phyllidiella lizae 2/-
Phyllidiella pustulosa 3/2 # 94%
Phyllidiopsis burni 1/-
Pleurolidia juliae -/1
Samla sp. 01 -/1
Tenellia sibogae 2/2
Tenellia sp. 01 -/2
Tenellia sp. 29 1/- +
Tritoniopsis elegans -/3
Trapania vitta 1/-

SPECIES GROUPED BY ORDER

Nudibranchia
Bornella anguliia -/5
Chromodoris elisabethina 1/-
Chromodoris kuiteri 3/-
Doriprismatica atromarginata 7/8
Glossodoris rufomarginata 1/-
Glossodoris vespa 2/1 
Goniobranchus splendidus -/2
Gymnodoris sp. 14 -/1 
Hexabranchus sanguineus -/1
Hypselodoris jacksoni -/2 
Hypselodoris tryoni 1/- 
Hypselodoris whitei 1/-
Phyllidia elegans 2/-
Phyllidia exquisita 1/-
Phyllidia ocellata 1/1
Phyllidia picta 1/-
Phyllidia sp. 04 5/- 
Phyllidiella lizae 2/-
Phyllidiella pustulosa 3/2 
Phyllidiopsis burni 1/-
Pleurolidia juliae -/1
Samla sp. 01 -/1
Tenellia sibogae 2/2
Tenellia sp. 01 -/2
Tenellia sp. 29 1/- 
Tritoniopsis elegans -/3
Trapania vitta 1/-

Cephalaspidea

Sacoglossa

Umbraculoidea

Pleurobranchoidea

Anaspidea

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