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Sicilian Bush-cricket

Pterolepis elymica

Sicilian Trout

Salmo cettii

Sickle-jawed Blood Bee

Sphecodes puncticeps

Sickle-winged Nightjar

Eleothreptus anomalus

Sicklefin Smoothhound

Mustelus lunulatus

Side Striped Barb

Systomus pleurotaenia

Side-fruited Crisp-moss

Pleurochaete squarrosa

Side-striped Shrub Frog

Pseudophilautus pleurotaenia

sidendyngbagge

Pubinus tomentosus

sidesaddle bristle fern

Didymoglossum pusillum

Sideshoot Bonnet

Mycena latifolia

Sierra de Aroa Collared Frog

Mannophryne molinai

Cebus leucocephalus

Sierra de Xucaneb Hidden Salamander

Cryptotriton xucaneborum

Sierra Huichol Peeping Frog

Eleutherodactylus wixarika

Sierra Juarez Alligator Lizard

Abronia juarezi

Sierra Juarez Treefrog

Sarcohyla sabrina

Sierra Leone Prinia

Schistolais leontica

Sierra Maestra Long-legged Frog

Eleutherodactylus maestrensis

Eleutherodactylus manantlanensis

Sierra mariano

Doraops zuloagai

Sierra Negra Giant Tortoise

Chelonoidis guntheri

Sieve-tooth Moss

Coscinodon cribrosus

sigdspydedderkopp

Silometopus reussi

Sophronia sicariellus