Wednesday, January 28, 2015

Species List: Terry's Delight, Arkwright Shoals, off Coolum, Sunshine Coast, 26-01-2015

32 species sighted at Terry's Delight, Arkwright Shoals, off Coolum, Sunshine Coast.

Julie, Terry & David on this Australia Day excursion consisting of 1 x 80 minute and 1 x 65 minute dives in depths between 14m & 18m. Water temperature 26C, viz 4-5m and increasing surge.

Surface conditions proved to be pleasant so we travelled up to the Arkwright Shoals hoping that the water clarity might be suitable. Visibility at the start of the first dive was an agreeable 5m but with the gradual increase in swell, and hence the surge below, the viz gradually dropped during the morning to less than 4m. The dive reel again became the diver's best friend as we searched further away from the anchor line. The first dive was pleasant the second hard work. Three species sighted that are not commonly found were Phyllodesmium koehleri, Thorunna sp. 1 and Trinchesia sp. 3. Also photographed a Gymnodoris alba with the noticeable and characteristic antero-lateral oral lappets. This convinces me that we have without doubt in the past recorded in amongst these some different but cryptic species.

Number of each species sighted: 1st dive/2nd dive
* Species with highest specimen count

Aegires citrinus 1/-
Aegires flores 1/3
Chromodoris elisabethina 2/2
Dermatobranchus ornatus 2/-
* Doriprismatica atromarginata 13/5
Elysia maoria -/1
Flabellina rubrolineata 1/1
Flabellina sp. 1 2/-
Glossodoris vespa 5/2
Goniobranchus collingwoodi -/1
Goniobranchus splendidus 3/-
Gymnodoris alba 1/-
Hexabranchus sanguineus -/1
Hypselodoris jacksoni 2/2
Hypselodoris sagamiensis -/1
Mexichromis festiva -/1
Mexichromis macropus -/1
Mexichromis trilineata 1/-
Noumea norba -/1
Phyllidia elegans 2/-
Phyllidia ocellata 2/-
Phyllidia varicosa -/2
Phyllidiella pustulosa 3/2
Phyllodesmium koehleri 1/-
Phyllodesmium magnum 2/-
Sagaminopteron ornatum 2/4
Thorunna sp. 1 -/2
Thuridilla splendens 3/1
Trinchesia sp. 1 -/1
Trinchesia sp. 3 2/1
Tritoniopsis alba 6/1
Tylodina corticalis -/1

A very healthy substrate

Tritoniopsis alba - a pair

Goniobranchus splendidus

Aegires citrinus

Phyllodesmium koehleri - uncommon

Phyllidia varicosa

Mexichromis festiva

Surface conditions - on the trip home. 
Mt. Coolum and Mudjimba Island in the 
background - overcast sky.

Phyllodesmium magnum

Aegires flores

Hypselodoris sagamiensis

Mexichromis macropus

Phyllidia elegans - a pair

Trinchesia sp. 3 - a pair - uncommon

Gymnodoris alba

Mexichromis trilineata

Glossodoris vespa

Flabellina sp. 1 - appears to have damaged 
rhinophores and missing the oral tentacles 

Thuridilla splendens

Noumea norba

Goniobranchus collingwoodi - feeding 
(buccal) tube extended

Thorunna sp. 1 - uncommon

Thorunna sp. 1

Thorunna sp. 1

Hexabranchus sanguineus

Trinchesia sp. 1