{'fraction_non_alphanumeric': 0.029106029106029108, 'fraction_numerical': 0.014553014553014554, 'mean_word_length': 5.01875, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Egg capsules of a parasitic turbellarian flatworm: Ultrastructure of hatching sutures

Egg capsules of Syndisyrinx franciscanus, an intestinal parasite of sea urchins (Strongylocentrotus spp.), consist of a bulb, which contains the embryos, and a stalk‐like filament. The wall of the bulb is about 12 μm thick and is composed of sclerotized proteins. The end of the bulb opposite the attachment of the filament bears a reticulum of hatching sutures. Transmission electron microscopy discloses that hatching sutures traverse the entire thickness of the capsule wall. The inner 9‐10 μm of sutures are a uniform 20 nm in width and contain a trilaminar cementum. The outer 2‐3 μm of sutures are 15 nm to more than 500 nm in width and contain an electron‐lucent cementum. The latter may contain an irregular, median, electron‐dense layer or, more commonly, electron‐dense granules. The outside of some capsules is partially covered by a thin, electron‐dense material.