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Dive Reports

18-06-2024 Innaminka Rock

DAY/DATE

Tuesday

18/06/2024

SITE/S

Innaminka Rock
Bowen 

 

PARTICIPANTS

Terry & Julie

 

TYPE

Subtidal

 

MODE

Boat Dives

 

VESSEL

Rebel II

 

DIVE

1

2

SITE/S

Innaminka Rock

Innaminka Rock

SPECIES #

11

6

DURATION

77 Min

60 Min

DEPTH/RANGE

8.2 m

7.0 m

TEMP.

21 C

23 C

VIS.

8 m

8 m

SURGE

Slight

Nil

CURRENT

Nil

Nil

COMMENTS & OBSERVATIONS

Despite the water being chilly, with visibility being so good, we headed off once again to Innaminka Rock to hunt for the elusive sea slugs amongst the algae. Conditions were a bit lumpy on the way there and on site, but there was no current and we anchored slightly shallower than last time. We scoured the algae covered rubble and headed up into the shallows where the algae drops off a bit. We made a few interesting finds, including some new ones for this site, although the phyllidiids still dominate.

Deciding it was time to move when the anchor was not where we left it, we ascended and moved in closer to the rock where it was more protected for the surface interval. The second dive at this location was not as productive as the first (despite the proximity) and with our drysuits being out of action and the semi-dry now more semi-wet, the cool water makes the hunt less enjoyable when you are not finding much. We have acclimatised very quickly to the warm summer water! Conditions had improved as the day went on and the trip home was smooth and the new finds made it worth the effort.

Taxonomic Diversity:
All of the 15 species sighted were nudibranchs, of which 13 were dorids comprising 8 x porostomes, (suctorial feeders – all of the Phyllidiidae family), 0 x phanerobranchs (non-retractile gill), 5 x cryptobranchs, (retractable gill) and 2 were cladobranchs comprising 1 x aeolid, 0 x arminids and 1 x dendronotinid. If diet is considered 13, of the the 15 species sighted were spongivores.

Our Historical Data:
– We have now completed 6 survey dives at Innaminika Rock since our first survey here on 18/06/2024.
– We have now recorded 40 species at this site.
Aside from most of the phyllidiids, which we still have under review:
– This is the first occasion on which we have recorded Limenandra fusiformis and Phyllidia tula in Australia;
– This is the first occasion we have recorded Goniobranchus sp. 10 in the Whitsundays;
– and Tritoniopsis elegans at this site.
– Our last survey here was on 7/05/2024.

Note on phyllidiids:
The Phyllidiella sp. a and sp. c2 in the species lists below refers to a taxonomic-cryptic species delineated in the paper:
Papu, A., Bogdanov, A., Bara, R., Kehraus, S., Konig, G., Yonow, N. & Wagele, H. (2022). Phyllidiidae (Nudibranchia, Heterobranchia, Gastropoda): an integrative taxonomic approach including chemical analyses. Organisms Diversity & Evolution. https://doi.org/10.1007/s13127-021-00535-7
At the time of publishing this report we are in the process of reviewing all of our phyllidiella records to align them with the findings of the above paper.

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

TOTAL SPECIES SIGHTED: 15

 

SPECIES LIST – ALPHABETICAL

Ceratosoma tenue -/2
Goniobranchus decorus 1/-
Goniobranchus sp. 10 1/- +
Hypselodoris emma 1/-
Hypselodoris tryoni 2/-
Limenandra fusiformis 1/- +++
Phyllidia coelestis 2/2
Phyllidia elegans 1/-
Phyllidia picta 2/2
Phyllidia tula 1/- +++
Phyllidia varicosa -/5
Phyllidiella sp. 5 -/1
Phyllidiella sp. a -/1
Phyllidiella sp. c2 1/-
Tritoniopsis elegans 5/-

SPECIES GROUPED BY ORDER

Nudibranchia
Dorids
Phanerobranchs

Cryptobranchs
Ceratosoma tenue -/2
Goniobranchus decorus 1/-
Goniobranchus sp. 10 1/-
Hypselodoris emma 1/-
Hypselodoris tryoni 2/-

Porostomes
Phyllidia coelestis 2/2
Phyllidia elegans 1/-
Phyllidia picta 2/2
Phyllidia tula 1/-
Phyllidia varicosa -/5
Phyllidiella sp. 5 -/1
Phyllidiella sp. a -/1
Phyllidiella sp. c2 1/-
Cladobranchs
Aeolids
Limenandra fusiformis 1/-
Arminids

Dendronotinids
Tritoniopsis elegans 5/-

Cephalaspidea

Pteropoda

Sacoglossa


Umbraculoidea

Pleurobranchoidea

Anaspidea

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