Et komplet tværbånd over undergumpen har jeg ofte tænkt som vigtig karakter for Stillehavslom (Gavia pacifica), men når jeg læser i Martin Garners bog ”Frontiers in Birding” så er et komplet tværbånd på undergumpen ikke usædvanligt hos Sortstrubet Lom som det også illustreres med denne typiske fugl og andre flyvende individer her i galleriet.

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I thought a complete vent strap was only shown on Pacific Diver but reading in Martin Garners book "Frontiers In Birding" research has shown that 93.5% of Juvenile Pacifics examined do have a vent strap and "limited" research of Western Europe Black-throated Divers indicates that a complete vent strap is not unusual and perhaps should no longer be considered a Key feature of Pacific