Haliotis clathrata Reeve, 1846
Distribution: East Africa & offshore islands to American Samoa,
Okinawa to Australia except southern coast. Size to 42mm.
From the shore down to 75m deep.

A specimen from Bantayan island, Cebu, Philippines. 27mm.
2-3m deep, under rocks, Fernão Veloso, Nacala Bay, Nampula, Mozambique.
22-23mm. Syn: H. venusta Adams & Reeve, 1850.
Sculpture made of scaly spiral cords; some of those that run between suture and holes
are more prominent (see near apex); dorsum crossed by wavy folds that never reach the row of holes.
An odd specimen, collected by dive, in Nacala Bay, Mozambique. 35mm.
The sculpture is broader than in average clatrhrata. Is this a form of pustulata?
1-2m deep, under rocks, Bohol island, Philippines, 21mm.
Patterns: prosocline between suture and holes, banded between holes and columella.
Color not very variable: background mainly red, with additional drawings made of two tones.
Green specimens occur in Queensland.
4 more shells from Balabac, Palawan.
Here, variations affect colours; in the circles, the two extreme reds of this lot.
A brown shell from north Bohol, Philippines. 26,6mm. The pattern changes a bit.
The species is sometimes offered under the name H. crebrisculpta Sowerby III, 1914,
a taxon that might be a junior synonym of H. squamosa J.E. Gray, 1826.
Variations in a single place : specimens from Fernão Veloso beach, Nacala Bay, Nampula, Mozambique.
Fished at 15-20m deep. Sizes from 19 to 22mm. The helicoidal pattern is not an absolute law.
East African shells seem smaller, and less flat than in western Pacific populations.
Comparison between tomricei and the elongated caledonian form of clathrata.
H. tomricei: 75m deep, Bohol, Philippines, 13,5mm.
H. clathrata: 8-10m deep, Sainte-Marie island, SW. lagoon of New Caledonia, 26mm.
Both shells were labelled "crebrisculpta".
5-10m deep, by dive, Olango island, Cebu, Philippines.
Beautiful flat and legthened specimen. 28,4mm.
3 specimens from Calituban island, Bohol, Philippines. 29-30mm.
Original pictures: © Franck Frydman.
1- A rounded specimen from Kwajalein. 23mm.
2- A lengthened shell from New Caledonia. 29mm.
3- A specimen from Mactan island, Cebu, Philippines. 30mm.
Original pictures: © Franck Frydman.
Two specimens from Guam, collected at 5m deep, under dead coral, Piti Reef. 18-22mm.
Original pictures: © Franck Frydman.

 
The variations in the form "tomricei" Patamakanthin, 2002:
 

By dive, at 35 feet deep, Linggatu Cove, Russell Group, Solomon archipelago. 15,5mm.
This species is the pearl of western Pacific haliotids: flat, elongate, thin and beautiful.
The white blotches along the row of holes can be observed on most of specimens.
Differences with thailandis are numerous: holes are tubular near the apex, the shell is not pink and green, but mainly red with white markings often in ziczac patterns, the columella is larger than in thailandis, the shape is less rounded than oblong, and there is no angular shoulder between the row of holes and the columella. Also, the average size seems larger.
Patterned. 10-20m deep, Balabac, Palawan, Philippines. 17,7mm. A very elegant species.
The area between row of holes and columella shows radial grooves; nacre with magenta shines.
Two specimens from Olango island, Cebu. Left: 5-10m deep. Right: 20-35m deep, Cawoi island.
20 & 22,7mm. The great difference with clathrata Reeve, is the smooth surface of the dorsum.
Again two shells from Olango island, Cebu. A: H. clathrata, B: H. clathrata f. tomricei.
Tomricei's sculpture is made, when it exists, of widely spaced spiral cords, crossed by even growth-lines. Regarding pattern, tomricei is not as regularly decorated as clathrata.

All pics © Olivier Caro