Macro
Nudibranchs
Nudibranchia · Marine gastropod mollusks, order Nudibranchia; order-level overview of more than 3,000 described species
Nudibranchs are the reason macro divers stop covering distance. More than three thousand described species of these shell-less snails crawl the world's seafloors wearing colors that work as warnings, advertisements, and camouflage all at once, and more are named every year, with muck hotspots regularly producing animals new to science. The order splits broadly in two: dorids, carrying a rosette of gills on the back, many recycling sponge toxins into chemical defense; and aeolids, fringed in tentacle-like cerata that store working stinging cells stolen from the hydroids they eat. Rhinophores, the paired head antennae, smell the water for prey and mates. Most species live weeks to a year, so casts turn over fast and no two months on the same site produce the same list. Slow to a crawl and the sand starts producing.
Dove e quando avvistarne uno
"Residente" significa che la maggior parte delle immersioni in quella destinazione li incontra; "stagionale" significa che sono presenti in modo affidabile nei mesi indicati; qualsiasi altra cosa è un bonus, non un piano.
| Destinazione | Affidabilità | Mesi | Note |
|---|---|---|---|
| AnilaoPhilippines | Resident: seen on most dives | Tutto l'anno | |
| Lembeh StraitIndonesia | Resident: seen on most dives | Tutto l'anno | |
| Dumaguete, Dauin & Apo IslandPhilippines | Resident: seen on most dives | Tutto l'anno | |
| Poor Knights IslandsNew Zealand | Resident: seen on most dives | Tutto l'anno | |
| British ColumbiaCanada | Resident: seen on most dives | Tutto l'anno | |
| Milne BayPapua New Guinea | Resident: seen on most dives | Tutto l'anno |
Il mese migliore, a colpo d'occhio
Capirle
Habitat: Every bottom type divers visit (reef, rubble, sand, kelp, jetty piles, mud), wherever each species' prey grows; the order as a whole ranges from tide pools to the deep sea.
Distribuzione: All oceans, polar to tropical; the Coral Triangle holds the richest shallow-water diversity known.
Comportamento: Slow, chemically defended browsers; hermaphrodites that mate side by side and lay coiled egg ribbons. Aeolid species store working stinging cells from the hydroids they eat.
Dieta: Specialists almost to a species: sponges, hydroids, bryozoans, tunicates, anemones, eggs, or other sea slugs.
Dimensioni: tipicamente intorno a 0.03 m; documentato fino a 0.6 m (order-wide range; most diver-found species are 1–6 cm, while the Spanish dancer reaches about 60 cm).
Come comportarsi in sua presenza
Shoot without touching or relocating: posed slugs on borrowed backgrounds are the macro world's staged wildlife problem. Keep strobe sessions short per animal.
Conservazione
Almost none have been evaluated for the IUCN Red List; their fortunes track the sponges, hydroids, and other prey they depend on.
Siti mappati noti per avvistamenti
I siti evidenziati sono stati schedati per questa specie dai nostri redattori; i numeri sono record di occorrenza GBIF registrati entro circa 5 km dal sito a partire dal 1990.
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